6513 lines
178 KiB
Text
6513 lines
178 KiB
Text
/* parse.y - Yacc grammar for bash. */
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/* Copyright (C) 1989-2015 Free Software Foundation, Inc.
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This file is part of GNU Bash, the Bourne Again SHell.
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Bash is free software: you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation, either version 3 of the License, or
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(at your option) any later version.
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Bash is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with Bash. If not, see <http://www.gnu.org/licenses/>.
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*/
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%{
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#include "config.h"
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#include "bashtypes.h"
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#include "bashansi.h"
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#include "filecntl.h"
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#if defined (HAVE_UNISTD_H)
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# include <unistd.h>
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#endif
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#if defined (HAVE_LOCALE_H)
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# include <locale.h>
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#endif
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#include <stdio.h>
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#include "chartypes.h"
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#include <signal.h>
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#include "memalloc.h"
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#include "bashintl.h"
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#define NEED_STRFTIME_DECL /* used in externs.h */
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#include "shell.h"
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#include "typemax.h" /* SIZE_MAX if needed */
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#include "trap.h"
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#include "flags.h"
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#include "parser.h"
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#include "mailcheck.h"
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#include "test.h"
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#include "builtins.h"
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#include "builtins/common.h"
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#include "builtins/builtext.h"
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#include "shmbutil.h"
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#if defined (READLINE)
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# include "bashline.h"
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# include <readline/readline.h>
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#endif /* READLINE */
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#if defined (HISTORY)
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# include "bashhist.h"
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# include <readline/history.h>
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#endif /* HISTORY */
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#if defined (JOB_CONTROL)
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# include "jobs.h"
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#else
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extern int cleanup_dead_jobs __P((void));
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#endif /* JOB_CONTROL */
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#if defined (ALIAS)
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# include "alias.h"
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#else
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typedef void *alias_t;
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#endif /* ALIAS */
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#if defined (PROMPT_STRING_DECODE)
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# ifndef _MINIX
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# include <sys/param.h>
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# endif
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# include <time.h>
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# if defined (TM_IN_SYS_TIME)
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# include <sys/types.h>
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# include <sys/time.h>
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# endif /* TM_IN_SYS_TIME */
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# include "maxpath.h"
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#endif /* PROMPT_STRING_DECODE */
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#define RE_READ_TOKEN -99
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#define NO_EXPANSION -100
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#ifdef DEBUG
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# define YYDEBUG 1
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#else
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# define YYDEBUG 0
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#endif
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#if defined (HANDLE_MULTIBYTE)
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# define last_shell_getc_is_singlebyte \
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((shell_input_line_index > 1) \
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? shell_input_line_property[shell_input_line_index - 1] \
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: 1)
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# define MBTEST(x) ((x) && last_shell_getc_is_singlebyte)
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#else
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# define last_shell_getc_is_singlebyte 1
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# define MBTEST(x) ((x))
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#endif
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#if defined (EXTENDED_GLOB)
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extern int extended_glob;
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#endif
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extern int eof_encountered;
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extern int no_line_editing, running_under_emacs;
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extern int current_command_number;
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extern int sourcelevel, parse_and_execute_level;
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extern int posixly_correct;
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extern int last_command_exit_value;
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extern pid_t last_command_subst_pid;
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extern char *shell_name, *current_host_name;
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extern char *dist_version;
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extern int patch_level;
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extern int dump_translatable_strings, dump_po_strings;
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extern sh_builtin_func_t *last_shell_builtin, *this_shell_builtin;
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extern int here_doc_first_line;
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#if defined (BUFFERED_INPUT)
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extern int bash_input_fd_changed;
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#endif
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extern int errno;
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/* **************************************************************** */
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/* */
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/* "Forward" declarations */
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/* */
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/* **************************************************************** */
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#ifdef DEBUG
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static void debug_parser __P((int));
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#endif
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static int yy_getc __P((void));
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static int yy_ungetc __P((int));
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#if defined (READLINE)
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static int yy_readline_get __P((void));
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static int yy_readline_unget __P((int));
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#endif
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static int yy_string_get __P((void));
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static int yy_string_unget __P((int));
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static void rewind_input_string __P((void));
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static int yy_stream_get __P((void));
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static int yy_stream_unget __P((int));
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static int shell_getc __P((int));
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static void shell_ungetc __P((int));
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static void discard_until __P((int));
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#if defined (ALIAS) || defined (DPAREN_ARITHMETIC)
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static void push_string __P((char *, int, alias_t *));
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static void pop_string __P((void));
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static void free_string_list __P((void));
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#endif
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static char *read_a_line __P((int));
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static int reserved_word_acceptable __P((int));
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static int yylex __P((void));
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static void push_heredoc __P((REDIRECT *));
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static char *mk_alexpansion __P((char *));
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static int alias_expand_token __P((char *));
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static int time_command_acceptable __P((void));
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static int special_case_tokens __P((char *));
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static int read_token __P((int));
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static char *parse_matched_pair __P((int, int, int, int *, int));
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static char *parse_comsub __P((int, int, int, int *, int));
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#if defined (ARRAY_VARS)
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static char *parse_compound_assignment __P((int *));
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#endif
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#if defined (DPAREN_ARITHMETIC) || defined (ARITH_FOR_COMMAND)
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static int parse_dparen __P((int));
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static int parse_arith_cmd __P((char **, int));
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#endif
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#if defined (COND_COMMAND)
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static void cond_error __P((void));
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static COND_COM *cond_expr __P((void));
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static COND_COM *cond_or __P((void));
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static COND_COM *cond_and __P((void));
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static COND_COM *cond_term __P((void));
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static int cond_skip_newlines __P((void));
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static COMMAND *parse_cond_command __P((void));
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#endif
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#if defined (ARRAY_VARS)
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static int token_is_assignment __P((char *, int));
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static int token_is_ident __P((char *, int));
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#endif
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static int read_token_word __P((int));
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static void discard_parser_constructs __P((int));
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static char *error_token_from_token __P((int));
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static char *error_token_from_text __P((void));
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static void print_offending_line __P((void));
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static void report_syntax_error __P((char *));
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static void handle_eof_input_unit __P((void));
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static void prompt_again __P((void));
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#if 0
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static void reset_readline_prompt __P((void));
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#endif
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static void print_prompt __P((void));
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#if defined (HANDLE_MULTIBYTE)
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static void set_line_mbstate __P((void));
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static char *shell_input_line_property = NULL;
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#else
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# define set_line_mbstate()
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#endif
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extern int yyerror __P((const char *));
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#ifdef DEBUG
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extern int yydebug;
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#endif
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/* Default prompt strings */
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char *primary_prompt = PPROMPT;
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char *secondary_prompt = SPROMPT;
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/* PROMPT_STRING_POINTER points to one of these, never to an actual string. */
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char *ps1_prompt, *ps2_prompt;
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/* Displayed after reading a command but before executing it in an interactive shell */
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char *ps0_prompt;
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/* Handle on the current prompt string. Indirectly points through
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ps1_ or ps2_prompt. */
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char **prompt_string_pointer = (char **)NULL;
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char *current_prompt_string;
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/* Non-zero means we expand aliases in commands. */
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int expand_aliases = 0;
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/* If non-zero, the decoded prompt string undergoes parameter and
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variable substitution, command substitution, arithmetic substitution,
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string expansion, process substitution, and quote removal in
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decode_prompt_string. */
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int promptvars = 1;
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/* If non-zero, $'...' and $"..." are expanded when they appear within
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a ${...} expansion, even when the expansion appears within double
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quotes. */
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int extended_quote = 1;
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/* The number of lines read from input while creating the current command. */
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int current_command_line_count;
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/* The number of lines in a command saved while we run parse_and_execute */
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int saved_command_line_count;
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/* The token that currently denotes the end of parse. */
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int shell_eof_token;
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/* The token currently being read. */
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int current_token;
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/* The current parser state. */
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int parser_state;
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/* Variables to manage the task of reading here documents, because we need to
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defer the reading until after a complete command has been collected. */
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static REDIRECT *redir_stack[HEREDOC_MAX];
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int need_here_doc;
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/* Where shell input comes from. History expansion is performed on each
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line when the shell is interactive. */
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static char *shell_input_line = (char *)NULL;
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static size_t shell_input_line_index;
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static size_t shell_input_line_size; /* Amount allocated for shell_input_line. */
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static size_t shell_input_line_len; /* strlen (shell_input_line) */
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/* Either zero or EOF. */
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static int shell_input_line_terminator;
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/* The line number in a script on which a function definition starts. */
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static int function_dstart;
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/* The line number in a script on which a function body starts. */
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static int function_bstart;
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/* The line number in a script at which an arithmetic for command starts. */
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static int arith_for_lineno;
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/* The decoded prompt string. Used if READLINE is not defined or if
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editing is turned off. Analogous to current_readline_prompt. */
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static char *current_decoded_prompt;
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/* The last read token, or NULL. read_token () uses this for context
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checking. */
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static int last_read_token;
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/* The token read prior to last_read_token. */
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static int token_before_that;
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/* The token read prior to token_before_that. */
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static int two_tokens_ago;
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static int global_extglob;
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/* The line number in a script where the word in a `case WORD', `select WORD'
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or `for WORD' begins. This is a nested command maximum, since the array
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index is decremented after a case, select, or for command is parsed. */
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#define MAX_CASE_NEST 128
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static int word_lineno[MAX_CASE_NEST+1];
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static int word_top = -1;
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/* If non-zero, it is the token that we want read_token to return
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regardless of what text is (or isn't) present to be read. This
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is reset by read_token. If token_to_read == WORD or
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ASSIGNMENT_WORD, yylval.word should be set to word_desc_to_read. */
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static int token_to_read;
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static WORD_DESC *word_desc_to_read;
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static REDIRECTEE source;
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static REDIRECTEE redir;
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%}
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%union {
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WORD_DESC *word; /* the word that we read. */
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int number; /* the number that we read. */
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WORD_LIST *word_list;
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COMMAND *command;
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REDIRECT *redirect;
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ELEMENT element;
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PATTERN_LIST *pattern;
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}
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/* Reserved words. Members of the first group are only recognized
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in the case that they are preceded by a list_terminator. Members
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of the second group are for [[...]] commands. Members of the
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third group are recognized only under special circumstances. */
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%token IF THEN ELSE ELIF FI CASE ESAC FOR SELECT WHILE UNTIL DO DONE FUNCTION COPROC
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%token COND_START COND_END COND_ERROR
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%token IN BANG TIME TIMEOPT TIMEIGN
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/* More general tokens. yylex () knows how to make these. */
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%token <word> WORD ASSIGNMENT_WORD REDIR_WORD
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%token <number> NUMBER
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%token <word_list> ARITH_CMD ARITH_FOR_EXPRS
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%token <command> COND_CMD
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%token AND_AND OR_OR GREATER_GREATER LESS_LESS LESS_AND LESS_LESS_LESS
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%token GREATER_AND SEMI_SEMI SEMI_AND SEMI_SEMI_AND
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%token LESS_LESS_MINUS AND_GREATER AND_GREATER_GREATER LESS_GREATER
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%token GREATER_BAR BAR_AND
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/* The types that the various syntactical units return. */
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%type <command> inputunit command pipeline pipeline_command
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%type <command> list list0 list1 compound_list simple_list simple_list1
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%type <command> simple_command shell_command
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%type <command> for_command select_command case_command group_command
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%type <command> arith_command
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%type <command> cond_command
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%type <command> arith_for_command
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%type <command> coproc
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%type <command> function_def function_body if_command elif_clause subshell
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%type <redirect> redirection redirection_list
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%type <element> simple_command_element
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%type <word_list> word_list pattern
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%type <pattern> pattern_list case_clause_sequence case_clause
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%type <number> timespec
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%type <number> list_terminator
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%start inputunit
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%left '&' ';' '\n' yacc_EOF
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%left AND_AND OR_OR
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%right '|' BAR_AND
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%%
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inputunit: simple_list simple_list_terminator
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{
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/* Case of regular command. Discard the error
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safety net,and return the command just parsed. */
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global_command = $1;
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eof_encountered = 0;
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/* discard_parser_constructs (0); */
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if (parser_state & PST_CMDSUBST)
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parser_state |= PST_EOFTOKEN;
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YYACCEPT;
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}
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| '\n'
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{
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/* Case of regular command, but not a very
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interesting one. Return a NULL command. */
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global_command = (COMMAND *)NULL;
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if (parser_state & PST_CMDSUBST)
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parser_state |= PST_EOFTOKEN;
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YYACCEPT;
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}
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| error '\n'
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{
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/* Error during parsing. Return NULL command. */
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global_command = (COMMAND *)NULL;
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eof_encountered = 0;
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/* discard_parser_constructs (1); */
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if (interactive && parse_and_execute_level == 0)
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{
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YYACCEPT;
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}
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else
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{
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YYABORT;
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}
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}
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| yacc_EOF
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{
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/* Case of EOF seen by itself. Do ignoreeof or
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not. */
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global_command = (COMMAND *)NULL;
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handle_eof_input_unit ();
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YYACCEPT;
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}
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;
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word_list: WORD
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{ $$ = make_word_list ($1, (WORD_LIST *)NULL); }
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| word_list WORD
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{ $$ = make_word_list ($2, $1); }
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;
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redirection: '>' WORD
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{
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source.dest = 1;
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redir.filename = $2;
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$$ = make_redirection (source, r_output_direction, redir, 0);
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}
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| '<' WORD
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{
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source.dest = 0;
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redir.filename = $2;
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$$ = make_redirection (source, r_input_direction, redir, 0);
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}
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| NUMBER '>' WORD
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{
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source.dest = $1;
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redir.filename = $3;
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$$ = make_redirection (source, r_output_direction, redir, 0);
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}
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| NUMBER '<' WORD
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{
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source.dest = $1;
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redir.filename = $3;
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$$ = make_redirection (source, r_input_direction, redir, 0);
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}
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| REDIR_WORD '>' WORD
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{
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source.filename = $1;
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redir.filename = $3;
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$$ = make_redirection (source, r_output_direction, redir, REDIR_VARASSIGN);
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}
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| REDIR_WORD '<' WORD
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{
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source.filename = $1;
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redir.filename = $3;
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$$ = make_redirection (source, r_input_direction, redir, REDIR_VARASSIGN);
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}
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| GREATER_GREATER WORD
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{
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source.dest = 1;
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redir.filename = $2;
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$$ = make_redirection (source, r_appending_to, redir, 0);
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}
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| NUMBER GREATER_GREATER WORD
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{
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source.dest = $1;
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redir.filename = $3;
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$$ = make_redirection (source, r_appending_to, redir, 0);
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}
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| REDIR_WORD GREATER_GREATER WORD
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{
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source.filename = $1;
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redir.filename = $3;
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$$ = make_redirection (source, r_appending_to, redir, REDIR_VARASSIGN);
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}
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| GREATER_BAR WORD
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{
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source.dest = 1;
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redir.filename = $2;
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$$ = make_redirection (source, r_output_force, redir, 0);
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}
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| NUMBER GREATER_BAR WORD
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{
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source.dest = $1;
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redir.filename = $3;
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$$ = make_redirection (source, r_output_force, redir, 0);
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}
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| REDIR_WORD GREATER_BAR WORD
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{
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source.filename = $1;
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redir.filename = $3;
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$$ = make_redirection (source, r_output_force, redir, REDIR_VARASSIGN);
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}
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| LESS_GREATER WORD
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{
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source.dest = 0;
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redir.filename = $2;
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$$ = make_redirection (source, r_input_output, redir, 0);
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}
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| NUMBER LESS_GREATER WORD
|
|
{
|
|
source.dest = $1;
|
|
redir.filename = $3;
|
|
$$ = make_redirection (source, r_input_output, redir, 0);
|
|
}
|
|
| REDIR_WORD LESS_GREATER WORD
|
|
{
|
|
source.filename = $1;
|
|
redir.filename = $3;
|
|
$$ = make_redirection (source, r_input_output, redir, REDIR_VARASSIGN);
|
|
}
|
|
| LESS_LESS WORD
|
|
{
|
|
source.dest = 0;
|
|
redir.filename = $2;
|
|
$$ = make_redirection (source, r_reading_until, redir, 0);
|
|
push_heredoc ($$);
|
|
}
|
|
| NUMBER LESS_LESS WORD
|
|
{
|
|
source.dest = $1;
|
|
redir.filename = $3;
|
|
$$ = make_redirection (source, r_reading_until, redir, 0);
|
|
push_heredoc ($$);
|
|
}
|
|
| REDIR_WORD LESS_LESS WORD
|
|
{
|
|
source.filename = $1;
|
|
redir.filename = $3;
|
|
$$ = make_redirection (source, r_reading_until, redir, REDIR_VARASSIGN);
|
|
push_heredoc ($$);
|
|
}
|
|
| LESS_LESS_MINUS WORD
|
|
{
|
|
source.dest = 0;
|
|
redir.filename = $2;
|
|
$$ = make_redirection (source, r_deblank_reading_until, redir, 0);
|
|
push_heredoc ($$);
|
|
}
|
|
| NUMBER LESS_LESS_MINUS WORD
|
|
{
|
|
source.dest = $1;
|
|
redir.filename = $3;
|
|
$$ = make_redirection (source, r_deblank_reading_until, redir, 0);
|
|
push_heredoc ($$);
|
|
}
|
|
| REDIR_WORD LESS_LESS_MINUS WORD
|
|
{
|
|
source.filename = $1;
|
|
redir.filename = $3;
|
|
$$ = make_redirection (source, r_deblank_reading_until, redir, REDIR_VARASSIGN);
|
|
push_heredoc ($$);
|
|
}
|
|
| LESS_LESS_LESS WORD
|
|
{
|
|
source.dest = 0;
|
|
redir.filename = $2;
|
|
$$ = make_redirection (source, r_reading_string, redir, 0);
|
|
}
|
|
| NUMBER LESS_LESS_LESS WORD
|
|
{
|
|
source.dest = $1;
|
|
redir.filename = $3;
|
|
$$ = make_redirection (source, r_reading_string, redir, 0);
|
|
}
|
|
| REDIR_WORD LESS_LESS_LESS WORD
|
|
{
|
|
source.filename = $1;
|
|
redir.filename = $3;
|
|
$$ = make_redirection (source, r_reading_string, redir, REDIR_VARASSIGN);
|
|
}
|
|
| LESS_AND NUMBER
|
|
{
|
|
source.dest = 0;
|
|
redir.dest = $2;
|
|
$$ = make_redirection (source, r_duplicating_input, redir, 0);
|
|
}
|
|
| NUMBER LESS_AND NUMBER
|
|
{
|
|
source.dest = $1;
|
|
redir.dest = $3;
|
|
$$ = make_redirection (source, r_duplicating_input, redir, 0);
|
|
}
|
|
| REDIR_WORD LESS_AND NUMBER
|
|
{
|
|
source.filename = $1;
|
|
redir.dest = $3;
|
|
$$ = make_redirection (source, r_duplicating_input, redir, REDIR_VARASSIGN);
|
|
}
|
|
| GREATER_AND NUMBER
|
|
{
|
|
source.dest = 1;
|
|
redir.dest = $2;
|
|
$$ = make_redirection (source, r_duplicating_output, redir, 0);
|
|
}
|
|
| NUMBER GREATER_AND NUMBER
|
|
{
|
|
source.dest = $1;
|
|
redir.dest = $3;
|
|
$$ = make_redirection (source, r_duplicating_output, redir, 0);
|
|
}
|
|
| REDIR_WORD GREATER_AND NUMBER
|
|
{
|
|
source.filename = $1;
|
|
redir.dest = $3;
|
|
$$ = make_redirection (source, r_duplicating_output, redir, REDIR_VARASSIGN);
|
|
}
|
|
| LESS_AND WORD
|
|
{
|
|
source.dest = 0;
|
|
redir.filename = $2;
|
|
$$ = make_redirection (source, r_duplicating_input_word, redir, 0);
|
|
}
|
|
| NUMBER LESS_AND WORD
|
|
{
|
|
source.dest = $1;
|
|
redir.filename = $3;
|
|
$$ = make_redirection (source, r_duplicating_input_word, redir, 0);
|
|
}
|
|
| REDIR_WORD LESS_AND WORD
|
|
{
|
|
source.filename = $1;
|
|
redir.filename = $3;
|
|
$$ = make_redirection (source, r_duplicating_input_word, redir, REDIR_VARASSIGN);
|
|
}
|
|
| GREATER_AND WORD
|
|
{
|
|
source.dest = 1;
|
|
redir.filename = $2;
|
|
$$ = make_redirection (source, r_duplicating_output_word, redir, 0);
|
|
}
|
|
| NUMBER GREATER_AND WORD
|
|
{
|
|
source.dest = $1;
|
|
redir.filename = $3;
|
|
$$ = make_redirection (source, r_duplicating_output_word, redir, 0);
|
|
}
|
|
| REDIR_WORD GREATER_AND WORD
|
|
{
|
|
source.filename = $1;
|
|
redir.filename = $3;
|
|
$$ = make_redirection (source, r_duplicating_output_word, redir, REDIR_VARASSIGN);
|
|
}
|
|
| GREATER_AND '-'
|
|
{
|
|
source.dest = 1;
|
|
redir.dest = 0;
|
|
$$ = make_redirection (source, r_close_this, redir, 0);
|
|
}
|
|
| NUMBER GREATER_AND '-'
|
|
{
|
|
source.dest = $1;
|
|
redir.dest = 0;
|
|
$$ = make_redirection (source, r_close_this, redir, 0);
|
|
}
|
|
| REDIR_WORD GREATER_AND '-'
|
|
{
|
|
source.filename = $1;
|
|
redir.dest = 0;
|
|
$$ = make_redirection (source, r_close_this, redir, REDIR_VARASSIGN);
|
|
}
|
|
| LESS_AND '-'
|
|
{
|
|
source.dest = 0;
|
|
redir.dest = 0;
|
|
$$ = make_redirection (source, r_close_this, redir, 0);
|
|
}
|
|
| NUMBER LESS_AND '-'
|
|
{
|
|
source.dest = $1;
|
|
redir.dest = 0;
|
|
$$ = make_redirection (source, r_close_this, redir, 0);
|
|
}
|
|
| REDIR_WORD LESS_AND '-'
|
|
{
|
|
source.filename = $1;
|
|
redir.dest = 0;
|
|
$$ = make_redirection (source, r_close_this, redir, REDIR_VARASSIGN);
|
|
}
|
|
| AND_GREATER WORD
|
|
{
|
|
source.dest = 1;
|
|
redir.filename = $2;
|
|
$$ = make_redirection (source, r_err_and_out, redir, 0);
|
|
}
|
|
| AND_GREATER_GREATER WORD
|
|
{
|
|
source.dest = 1;
|
|
redir.filename = $2;
|
|
$$ = make_redirection (source, r_append_err_and_out, redir, 0);
|
|
}
|
|
;
|
|
|
|
simple_command_element: WORD
|
|
{ $$.word = $1; $$.redirect = 0; }
|
|
| ASSIGNMENT_WORD
|
|
{ $$.word = $1; $$.redirect = 0; }
|
|
| redirection
|
|
{ $$.redirect = $1; $$.word = 0; }
|
|
;
|
|
|
|
redirection_list: redirection
|
|
{
|
|
$$ = $1;
|
|
}
|
|
| redirection_list redirection
|
|
{
|
|
register REDIRECT *t;
|
|
|
|
for (t = $1; t->next; t = t->next)
|
|
;
|
|
t->next = $2;
|
|
$$ = $1;
|
|
}
|
|
;
|
|
|
|
simple_command: simple_command_element
|
|
{ $$ = make_simple_command ($1, (COMMAND *)NULL); }
|
|
| simple_command simple_command_element
|
|
{ $$ = make_simple_command ($2, $1); }
|
|
;
|
|
|
|
command: simple_command
|
|
{ $$ = clean_simple_command ($1); }
|
|
| shell_command
|
|
{ $$ = $1; }
|
|
| shell_command redirection_list
|
|
{
|
|
COMMAND *tc;
|
|
|
|
tc = $1;
|
|
if (tc->redirects)
|
|
{
|
|
register REDIRECT *t;
|
|
for (t = tc->redirects; t->next; t = t->next)
|
|
;
|
|
t->next = $2;
|
|
}
|
|
else
|
|
tc->redirects = $2;
|
|
$$ = $1;
|
|
}
|
|
| function_def
|
|
{ $$ = $1; }
|
|
| coproc
|
|
{ $$ = $1; }
|
|
;
|
|
|
|
shell_command: for_command
|
|
{ $$ = $1; }
|
|
| case_command
|
|
{ $$ = $1; }
|
|
| WHILE compound_list DO compound_list DONE
|
|
{ $$ = make_while_command ($2, $4); }
|
|
| UNTIL compound_list DO compound_list DONE
|
|
{ $$ = make_until_command ($2, $4); }
|
|
| select_command
|
|
{ $$ = $1; }
|
|
| if_command
|
|
{ $$ = $1; }
|
|
| subshell
|
|
{ $$ = $1; }
|
|
| group_command
|
|
{ $$ = $1; }
|
|
| arith_command
|
|
{ $$ = $1; }
|
|
| cond_command
|
|
{ $$ = $1; }
|
|
| arith_for_command
|
|
{ $$ = $1; }
|
|
;
|
|
|
|
for_command: FOR WORD newline_list DO compound_list DONE
|
|
{
|
|
$$ = make_for_command ($2, add_string_to_list ("\"$@\"", (WORD_LIST *)NULL), $5, word_lineno[word_top]);
|
|
if (word_top > 0) word_top--;
|
|
}
|
|
| FOR WORD newline_list '{' compound_list '}'
|
|
{
|
|
$$ = make_for_command ($2, add_string_to_list ("\"$@\"", (WORD_LIST *)NULL), $5, word_lineno[word_top]);
|
|
if (word_top > 0) word_top--;
|
|
}
|
|
| FOR WORD ';' newline_list DO compound_list DONE
|
|
{
|
|
$$ = make_for_command ($2, add_string_to_list ("\"$@\"", (WORD_LIST *)NULL), $6, word_lineno[word_top]);
|
|
if (word_top > 0) word_top--;
|
|
}
|
|
| FOR WORD ';' newline_list '{' compound_list '}'
|
|
{
|
|
$$ = make_for_command ($2, add_string_to_list ("\"$@\"", (WORD_LIST *)NULL), $6, word_lineno[word_top]);
|
|
if (word_top > 0) word_top--;
|
|
}
|
|
| FOR WORD newline_list IN word_list list_terminator newline_list DO compound_list DONE
|
|
{
|
|
$$ = make_for_command ($2, REVERSE_LIST ($5, WORD_LIST *), $9, word_lineno[word_top]);
|
|
if (word_top > 0) word_top--;
|
|
}
|
|
| FOR WORD newline_list IN word_list list_terminator newline_list '{' compound_list '}'
|
|
{
|
|
$$ = make_for_command ($2, REVERSE_LIST ($5, WORD_LIST *), $9, word_lineno[word_top]);
|
|
if (word_top > 0) word_top--;
|
|
}
|
|
| FOR WORD newline_list IN list_terminator newline_list DO compound_list DONE
|
|
{
|
|
$$ = make_for_command ($2, (WORD_LIST *)NULL, $8, word_lineno[word_top]);
|
|
if (word_top > 0) word_top--;
|
|
}
|
|
| FOR WORD newline_list IN list_terminator newline_list '{' compound_list '}'
|
|
{
|
|
$$ = make_for_command ($2, (WORD_LIST *)NULL, $8, word_lineno[word_top]);
|
|
if (word_top > 0) word_top--;
|
|
}
|
|
;
|
|
|
|
arith_for_command: FOR ARITH_FOR_EXPRS list_terminator newline_list DO compound_list DONE
|
|
{
|
|
$$ = make_arith_for_command ($2, $6, arith_for_lineno);
|
|
if (word_top > 0) word_top--;
|
|
}
|
|
| FOR ARITH_FOR_EXPRS list_terminator newline_list '{' compound_list '}'
|
|
{
|
|
$$ = make_arith_for_command ($2, $6, arith_for_lineno);
|
|
if (word_top > 0) word_top--;
|
|
}
|
|
| FOR ARITH_FOR_EXPRS DO compound_list DONE
|
|
{
|
|
$$ = make_arith_for_command ($2, $4, arith_for_lineno);
|
|
if (word_top > 0) word_top--;
|
|
}
|
|
| FOR ARITH_FOR_EXPRS '{' compound_list '}'
|
|
{
|
|
$$ = make_arith_for_command ($2, $4, arith_for_lineno);
|
|
if (word_top > 0) word_top--;
|
|
}
|
|
;
|
|
|
|
select_command: SELECT WORD newline_list DO list DONE
|
|
{
|
|
$$ = make_select_command ($2, add_string_to_list ("\"$@\"", (WORD_LIST *)NULL), $5, word_lineno[word_top]);
|
|
if (word_top > 0) word_top--;
|
|
}
|
|
| SELECT WORD newline_list '{' list '}'
|
|
{
|
|
$$ = make_select_command ($2, add_string_to_list ("\"$@\"", (WORD_LIST *)NULL), $5, word_lineno[word_top]);
|
|
if (word_top > 0) word_top--;
|
|
}
|
|
| SELECT WORD ';' newline_list DO list DONE
|
|
{
|
|
$$ = make_select_command ($2, add_string_to_list ("\"$@\"", (WORD_LIST *)NULL), $6, word_lineno[word_top]);
|
|
if (word_top > 0) word_top--;
|
|
}
|
|
| SELECT WORD ';' newline_list '{' list '}'
|
|
{
|
|
$$ = make_select_command ($2, add_string_to_list ("\"$@\"", (WORD_LIST *)NULL), $6, word_lineno[word_top]);
|
|
if (word_top > 0) word_top--;
|
|
}
|
|
| SELECT WORD newline_list IN word_list list_terminator newline_list DO list DONE
|
|
{
|
|
$$ = make_select_command ($2, REVERSE_LIST ($5, WORD_LIST *), $9, word_lineno[word_top]);
|
|
if (word_top > 0) word_top--;
|
|
}
|
|
| SELECT WORD newline_list IN word_list list_terminator newline_list '{' list '}'
|
|
{
|
|
$$ = make_select_command ($2, REVERSE_LIST ($5, WORD_LIST *), $9, word_lineno[word_top]);
|
|
if (word_top > 0) word_top--;
|
|
}
|
|
;
|
|
|
|
case_command: CASE WORD newline_list IN newline_list ESAC
|
|
{
|
|
$$ = make_case_command ($2, (PATTERN_LIST *)NULL, word_lineno[word_top]);
|
|
if (word_top > 0) word_top--;
|
|
}
|
|
| CASE WORD newline_list IN case_clause_sequence newline_list ESAC
|
|
{
|
|
$$ = make_case_command ($2, $5, word_lineno[word_top]);
|
|
if (word_top > 0) word_top--;
|
|
}
|
|
| CASE WORD newline_list IN case_clause ESAC
|
|
{
|
|
$$ = make_case_command ($2, $5, word_lineno[word_top]);
|
|
if (word_top > 0) word_top--;
|
|
}
|
|
;
|
|
|
|
function_def: WORD '(' ')' newline_list function_body
|
|
{ $$ = make_function_def ($1, $5, function_dstart, function_bstart); }
|
|
|
|
| FUNCTION WORD '(' ')' newline_list function_body
|
|
{ $$ = make_function_def ($2, $6, function_dstart, function_bstart); }
|
|
|
|
| FUNCTION WORD newline_list function_body
|
|
{ $$ = make_function_def ($2, $4, function_dstart, function_bstart); }
|
|
;
|
|
|
|
function_body: shell_command
|
|
{ $$ = $1; }
|
|
| shell_command redirection_list
|
|
{
|
|
COMMAND *tc;
|
|
|
|
tc = $1;
|
|
/* According to Posix.2 3.9.5, redirections
|
|
specified after the body of a function should
|
|
be attached to the function and performed when
|
|
the function is executed, not as part of the
|
|
function definition command. */
|
|
/* XXX - I don't think it matters, but we might
|
|
want to change this in the future to avoid
|
|
problems differentiating between a function
|
|
definition with a redirection and a function
|
|
definition containing a single command with a
|
|
redirection. The two are semantically equivalent,
|
|
though -- the only difference is in how the
|
|
command printing code displays the redirections. */
|
|
if (tc->redirects)
|
|
{
|
|
register REDIRECT *t;
|
|
for (t = tc->redirects; t->next; t = t->next)
|
|
;
|
|
t->next = $2;
|
|
}
|
|
else
|
|
tc->redirects = $2;
|
|
$$ = $1;
|
|
}
|
|
;
|
|
|
|
subshell: '(' compound_list ')'
|
|
{
|
|
$$ = make_subshell_command ($2);
|
|
$$->flags |= CMD_WANT_SUBSHELL;
|
|
}
|
|
;
|
|
|
|
coproc: COPROC shell_command
|
|
{
|
|
$$ = make_coproc_command ("COPROC", $2);
|
|
$$->flags |= CMD_WANT_SUBSHELL|CMD_COPROC_SUBSHELL;
|
|
}
|
|
| COPROC shell_command redirection_list
|
|
{
|
|
COMMAND *tc;
|
|
|
|
tc = $2;
|
|
if (tc->redirects)
|
|
{
|
|
register REDIRECT *t;
|
|
for (t = tc->redirects; t->next; t = t->next)
|
|
;
|
|
t->next = $3;
|
|
}
|
|
else
|
|
tc->redirects = $3;
|
|
$$ = make_coproc_command ("COPROC", $2);
|
|
$$->flags |= CMD_WANT_SUBSHELL|CMD_COPROC_SUBSHELL;
|
|
}
|
|
| COPROC WORD shell_command
|
|
{
|
|
$$ = make_coproc_command ($2->word, $3);
|
|
$$->flags |= CMD_WANT_SUBSHELL|CMD_COPROC_SUBSHELL;
|
|
}
|
|
| COPROC WORD shell_command redirection_list
|
|
{
|
|
COMMAND *tc;
|
|
|
|
tc = $3;
|
|
if (tc->redirects)
|
|
{
|
|
register REDIRECT *t;
|
|
for (t = tc->redirects; t->next; t = t->next)
|
|
;
|
|
t->next = $4;
|
|
}
|
|
else
|
|
tc->redirects = $4;
|
|
$$ = make_coproc_command ($2->word, $3);
|
|
$$->flags |= CMD_WANT_SUBSHELL|CMD_COPROC_SUBSHELL;
|
|
}
|
|
| COPROC simple_command
|
|
{
|
|
$$ = make_coproc_command ("COPROC", clean_simple_command ($2));
|
|
$$->flags |= CMD_WANT_SUBSHELL|CMD_COPROC_SUBSHELL;
|
|
}
|
|
;
|
|
|
|
if_command: IF compound_list THEN compound_list FI
|
|
{ $$ = make_if_command ($2, $4, (COMMAND *)NULL); }
|
|
| IF compound_list THEN compound_list ELSE compound_list FI
|
|
{ $$ = make_if_command ($2, $4, $6); }
|
|
| IF compound_list THEN compound_list elif_clause FI
|
|
{ $$ = make_if_command ($2, $4, $5); }
|
|
;
|
|
|
|
|
|
group_command: '{' compound_list '}'
|
|
{ $$ = make_group_command ($2); }
|
|
;
|
|
|
|
arith_command: ARITH_CMD
|
|
{ $$ = make_arith_command ($1); }
|
|
;
|
|
|
|
cond_command: COND_START COND_CMD COND_END
|
|
{ $$ = $2; }
|
|
;
|
|
|
|
elif_clause: ELIF compound_list THEN compound_list
|
|
{ $$ = make_if_command ($2, $4, (COMMAND *)NULL); }
|
|
| ELIF compound_list THEN compound_list ELSE compound_list
|
|
{ $$ = make_if_command ($2, $4, $6); }
|
|
| ELIF compound_list THEN compound_list elif_clause
|
|
{ $$ = make_if_command ($2, $4, $5); }
|
|
;
|
|
|
|
case_clause: pattern_list
|
|
| case_clause_sequence pattern_list
|
|
{ $2->next = $1; $$ = $2; }
|
|
;
|
|
|
|
pattern_list: newline_list pattern ')' compound_list
|
|
{ $$ = make_pattern_list ($2, $4); }
|
|
| newline_list pattern ')' newline_list
|
|
{ $$ = make_pattern_list ($2, (COMMAND *)NULL); }
|
|
| newline_list '(' pattern ')' compound_list
|
|
{ $$ = make_pattern_list ($3, $5); }
|
|
| newline_list '(' pattern ')' newline_list
|
|
{ $$ = make_pattern_list ($3, (COMMAND *)NULL); }
|
|
;
|
|
|
|
case_clause_sequence: pattern_list SEMI_SEMI
|
|
{ $$ = $1; }
|
|
| case_clause_sequence pattern_list SEMI_SEMI
|
|
{ $2->next = $1; $$ = $2; }
|
|
| pattern_list SEMI_AND
|
|
{ $1->flags |= CASEPAT_FALLTHROUGH; $$ = $1; }
|
|
| case_clause_sequence pattern_list SEMI_AND
|
|
{ $2->flags |= CASEPAT_FALLTHROUGH; $2->next = $1; $$ = $2; }
|
|
| pattern_list SEMI_SEMI_AND
|
|
{ $1->flags |= CASEPAT_TESTNEXT; $$ = $1; }
|
|
| case_clause_sequence pattern_list SEMI_SEMI_AND
|
|
{ $2->flags |= CASEPAT_TESTNEXT; $2->next = $1; $$ = $2; }
|
|
;
|
|
|
|
pattern: WORD
|
|
{ $$ = make_word_list ($1, (WORD_LIST *)NULL); }
|
|
| pattern '|' WORD
|
|
{ $$ = make_word_list ($3, $1); }
|
|
;
|
|
|
|
/* A list allows leading or trailing newlines and
|
|
newlines as operators (equivalent to semicolons).
|
|
It must end with a newline or semicolon.
|
|
Lists are used within commands such as if, for, while. */
|
|
|
|
list: newline_list list0
|
|
{
|
|
$$ = $2;
|
|
if (need_here_doc)
|
|
gather_here_documents ();
|
|
}
|
|
;
|
|
|
|
compound_list: list
|
|
| newline_list list1
|
|
{
|
|
$$ = $2;
|
|
}
|
|
;
|
|
|
|
list0: list1 '\n' newline_list
|
|
| list1 '&' newline_list
|
|
{
|
|
if ($1->type == cm_connection)
|
|
$$ = connect_async_list ($1, (COMMAND *)NULL, '&');
|
|
else
|
|
$$ = command_connect ($1, (COMMAND *)NULL, '&');
|
|
}
|
|
| list1 ';' newline_list
|
|
|
|
;
|
|
|
|
list1: list1 AND_AND newline_list list1
|
|
{ $$ = command_connect ($1, $4, AND_AND); }
|
|
| list1 OR_OR newline_list list1
|
|
{ $$ = command_connect ($1, $4, OR_OR); }
|
|
| list1 '&' newline_list list1
|
|
{
|
|
if ($1->type == cm_connection)
|
|
$$ = connect_async_list ($1, $4, '&');
|
|
else
|
|
$$ = command_connect ($1, $4, '&');
|
|
}
|
|
| list1 ';' newline_list list1
|
|
{ $$ = command_connect ($1, $4, ';'); }
|
|
| list1 '\n' newline_list list1
|
|
{ $$ = command_connect ($1, $4, ';'); }
|
|
| pipeline_command
|
|
{ $$ = $1; }
|
|
;
|
|
|
|
simple_list_terminator: '\n'
|
|
| yacc_EOF
|
|
;
|
|
|
|
list_terminator:'\n'
|
|
{ $$ = '\n'; }
|
|
| ';'
|
|
{ $$ = ';'; }
|
|
| yacc_EOF
|
|
{ $$ = yacc_EOF; }
|
|
;
|
|
|
|
newline_list:
|
|
| newline_list '\n'
|
|
;
|
|
|
|
/* A simple_list is a list that contains no significant newlines
|
|
and no leading or trailing newlines. Newlines are allowed
|
|
only following operators, where they are not significant.
|
|
|
|
This is what an inputunit consists of. */
|
|
|
|
simple_list: simple_list1
|
|
{
|
|
$$ = $1;
|
|
if (need_here_doc)
|
|
gather_here_documents ();
|
|
if ((parser_state & PST_CMDSUBST) && current_token == shell_eof_token)
|
|
{
|
|
global_command = $1;
|
|
eof_encountered = 0;
|
|
rewind_input_string ();
|
|
YYACCEPT;
|
|
}
|
|
}
|
|
| simple_list1 '&'
|
|
{
|
|
if ($1->type == cm_connection)
|
|
$$ = connect_async_list ($1, (COMMAND *)NULL, '&');
|
|
else
|
|
$$ = command_connect ($1, (COMMAND *)NULL, '&');
|
|
if (need_here_doc)
|
|
gather_here_documents ();
|
|
if ((parser_state & PST_CMDSUBST) && current_token == shell_eof_token)
|
|
{
|
|
global_command = $1;
|
|
eof_encountered = 0;
|
|
rewind_input_string ();
|
|
YYACCEPT;
|
|
}
|
|
}
|
|
| simple_list1 ';'
|
|
{
|
|
$$ = $1;
|
|
if (need_here_doc)
|
|
gather_here_documents ();
|
|
if ((parser_state & PST_CMDSUBST) && current_token == shell_eof_token)
|
|
{
|
|
global_command = $1;
|
|
eof_encountered = 0;
|
|
rewind_input_string ();
|
|
YYACCEPT;
|
|
}
|
|
}
|
|
;
|
|
|
|
simple_list1: simple_list1 AND_AND newline_list simple_list1
|
|
{ $$ = command_connect ($1, $4, AND_AND); }
|
|
| simple_list1 OR_OR newline_list simple_list1
|
|
{ $$ = command_connect ($1, $4, OR_OR); }
|
|
| simple_list1 '&' simple_list1
|
|
{
|
|
if ($1->type == cm_connection)
|
|
$$ = connect_async_list ($1, $3, '&');
|
|
else
|
|
$$ = command_connect ($1, $3, '&');
|
|
}
|
|
| simple_list1 ';' simple_list1
|
|
{ $$ = command_connect ($1, $3, ';'); }
|
|
|
|
| pipeline_command
|
|
{ $$ = $1; }
|
|
;
|
|
|
|
pipeline_command: pipeline
|
|
{ $$ = $1; }
|
|
| BANG pipeline_command
|
|
{
|
|
if ($2)
|
|
$2->flags ^= CMD_INVERT_RETURN; /* toggle */
|
|
$$ = $2;
|
|
}
|
|
| timespec pipeline_command
|
|
{
|
|
if ($2)
|
|
$2->flags |= $1;
|
|
$$ = $2;
|
|
}
|
|
| timespec list_terminator
|
|
{
|
|
ELEMENT x;
|
|
|
|
/* Boy, this is unclean. `time' by itself can
|
|
time a null command. We cheat and push a
|
|
newline back if the list_terminator was a newline
|
|
to avoid the double-newline problem (one to
|
|
terminate this, one to terminate the command) */
|
|
x.word = 0;
|
|
x.redirect = 0;
|
|
$$ = make_simple_command (x, (COMMAND *)NULL);
|
|
$$->flags |= $1;
|
|
/* XXX - let's cheat and push a newline back */
|
|
if ($2 == '\n')
|
|
token_to_read = '\n';
|
|
else if ($2 == ';')
|
|
token_to_read = ';';
|
|
}
|
|
| BANG list_terminator
|
|
{
|
|
ELEMENT x;
|
|
|
|
/* This is just as unclean. Posix says that `!'
|
|
by itself should be equivalent to `false'.
|
|
We cheat and push a
|
|
newline back if the list_terminator was a newline
|
|
to avoid the double-newline problem (one to
|
|
terminate this, one to terminate the command) */
|
|
x.word = 0;
|
|
x.redirect = 0;
|
|
$$ = make_simple_command (x, (COMMAND *)NULL);
|
|
$$->flags |= CMD_INVERT_RETURN;
|
|
/* XXX - let's cheat and push a newline back */
|
|
if ($2 == '\n')
|
|
token_to_read = '\n';
|
|
if ($2 == ';')
|
|
token_to_read = ';';
|
|
}
|
|
;
|
|
|
|
pipeline: pipeline '|' newline_list pipeline
|
|
{ $$ = command_connect ($1, $4, '|'); }
|
|
| pipeline BAR_AND newline_list pipeline
|
|
{
|
|
/* Make cmd1 |& cmd2 equivalent to cmd1 2>&1 | cmd2 */
|
|
COMMAND *tc;
|
|
REDIRECTEE rd, sd;
|
|
REDIRECT *r;
|
|
|
|
tc = $1->type == cm_simple ? (COMMAND *)$1->value.Simple : $1;
|
|
sd.dest = 2;
|
|
rd.dest = 1;
|
|
r = make_redirection (sd, r_duplicating_output, rd, 0);
|
|
if (tc->redirects)
|
|
{
|
|
register REDIRECT *t;
|
|
for (t = tc->redirects; t->next; t = t->next)
|
|
;
|
|
t->next = r;
|
|
}
|
|
else
|
|
tc->redirects = r;
|
|
|
|
$$ = command_connect ($1, $4, '|');
|
|
}
|
|
| command
|
|
{ $$ = $1; }
|
|
;
|
|
|
|
timespec: TIME
|
|
{ $$ = CMD_TIME_PIPELINE; }
|
|
| TIME TIMEOPT
|
|
{ $$ = CMD_TIME_PIPELINE|CMD_TIME_POSIX; }
|
|
| TIME TIMEOPT TIMEIGN
|
|
{ $$ = CMD_TIME_PIPELINE|CMD_TIME_POSIX; }
|
|
;
|
|
%%
|
|
|
|
/* Initial size to allocate for tokens, and the
|
|
amount to grow them by. */
|
|
#define TOKEN_DEFAULT_INITIAL_SIZE 496
|
|
#define TOKEN_DEFAULT_GROW_SIZE 512
|
|
|
|
/* Should we call prompt_again? */
|
|
#define SHOULD_PROMPT() \
|
|
(interactive && (bash_input.type == st_stdin || bash_input.type == st_stream))
|
|
|
|
#if defined (ALIAS)
|
|
# define expanding_alias() (pushed_string_list && pushed_string_list->expander)
|
|
#else
|
|
# define expanding_alias() 0
|
|
#endif
|
|
|
|
/* Global var is non-zero when end of file has been reached. */
|
|
int EOF_Reached = 0;
|
|
|
|
#ifdef DEBUG
|
|
static void
|
|
debug_parser (i)
|
|
int i;
|
|
{
|
|
#if YYDEBUG != 0
|
|
yydebug = i;
|
|
#endif
|
|
}
|
|
#endif
|
|
|
|
/* yy_getc () returns the next available character from input or EOF.
|
|
yy_ungetc (c) makes `c' the next character to read.
|
|
init_yy_io (get, unget, type, location) makes the function GET the
|
|
installed function for getting the next character, makes UNGET the
|
|
installed function for un-getting a character, sets the type of stream
|
|
(either string or file) from TYPE, and makes LOCATION point to where
|
|
the input is coming from. */
|
|
|
|
/* Unconditionally returns end-of-file. */
|
|
int
|
|
return_EOF ()
|
|
{
|
|
return (EOF);
|
|
}
|
|
|
|
/* Variable containing the current get and unget functions.
|
|
See ./input.h for a clearer description. */
|
|
BASH_INPUT bash_input;
|
|
|
|
/* Set all of the fields in BASH_INPUT to NULL. Free bash_input.name if it
|
|
is non-null, avoiding a memory leak. */
|
|
void
|
|
initialize_bash_input ()
|
|
{
|
|
bash_input.type = st_none;
|
|
FREE (bash_input.name);
|
|
bash_input.name = (char *)NULL;
|
|
bash_input.location.file = (FILE *)NULL;
|
|
bash_input.location.string = (char *)NULL;
|
|
bash_input.getter = (sh_cget_func_t *)NULL;
|
|
bash_input.ungetter = (sh_cunget_func_t *)NULL;
|
|
}
|
|
|
|
/* Set the contents of the current bash input stream from
|
|
GET, UNGET, TYPE, NAME, and LOCATION. */
|
|
void
|
|
init_yy_io (get, unget, type, name, location)
|
|
sh_cget_func_t *get;
|
|
sh_cunget_func_t *unget;
|
|
enum stream_type type;
|
|
const char *name;
|
|
INPUT_STREAM location;
|
|
{
|
|
bash_input.type = type;
|
|
FREE (bash_input.name);
|
|
bash_input.name = name ? savestring (name) : (char *)NULL;
|
|
|
|
/* XXX */
|
|
#if defined (CRAY)
|
|
memcpy((char *)&bash_input.location.string, (char *)&location.string, sizeof(location));
|
|
#else
|
|
bash_input.location = location;
|
|
#endif
|
|
bash_input.getter = get;
|
|
bash_input.ungetter = unget;
|
|
}
|
|
|
|
char *
|
|
yy_input_name ()
|
|
{
|
|
return (bash_input.name ? bash_input.name : "stdin");
|
|
}
|
|
|
|
/* Call this to get the next character of input. */
|
|
static int
|
|
yy_getc ()
|
|
{
|
|
return (*(bash_input.getter)) ();
|
|
}
|
|
|
|
/* Call this to unget C. That is, to make C the next character
|
|
to be read. */
|
|
static int
|
|
yy_ungetc (c)
|
|
int c;
|
|
{
|
|
return (*(bash_input.ungetter)) (c);
|
|
}
|
|
|
|
#if defined (BUFFERED_INPUT)
|
|
#ifdef INCLUDE_UNUSED
|
|
int
|
|
input_file_descriptor ()
|
|
{
|
|
switch (bash_input.type)
|
|
{
|
|
case st_stream:
|
|
return (fileno (bash_input.location.file));
|
|
case st_bstream:
|
|
return (bash_input.location.buffered_fd);
|
|
case st_stdin:
|
|
default:
|
|
return (fileno (stdin));
|
|
}
|
|
}
|
|
#endif
|
|
#endif /* BUFFERED_INPUT */
|
|
|
|
/* **************************************************************** */
|
|
/* */
|
|
/* Let input be read from readline (). */
|
|
/* */
|
|
/* **************************************************************** */
|
|
|
|
#if defined (READLINE)
|
|
char *current_readline_prompt = (char *)NULL;
|
|
char *current_readline_line = (char *)NULL;
|
|
int current_readline_line_index = 0;
|
|
|
|
static int
|
|
yy_readline_get ()
|
|
{
|
|
SigHandler *old_sigint;
|
|
int line_len;
|
|
unsigned char c;
|
|
|
|
if (current_readline_line == 0)
|
|
{
|
|
if (bash_readline_initialized == 0)
|
|
initialize_readline ();
|
|
|
|
#if defined (JOB_CONTROL)
|
|
if (job_control)
|
|
give_terminal_to (shell_pgrp, 0);
|
|
#endif /* JOB_CONTROL */
|
|
|
|
old_sigint = IMPOSSIBLE_TRAP_HANDLER;
|
|
if (signal_is_ignored (SIGINT) == 0)
|
|
{
|
|
/* interrupt_immediately++; */
|
|
old_sigint = (SigHandler *)set_signal_handler (SIGINT, sigint_sighandler);
|
|
}
|
|
|
|
current_readline_line = readline (current_readline_prompt ?
|
|
current_readline_prompt : "");
|
|
|
|
CHECK_TERMSIG;
|
|
if (signal_is_ignored (SIGINT) == 0)
|
|
{
|
|
/* interrupt_immediately--; */
|
|
if (old_sigint != IMPOSSIBLE_TRAP_HANDLER)
|
|
set_signal_handler (SIGINT, old_sigint);
|
|
}
|
|
|
|
#if 0
|
|
/* Reset the prompt to the decoded value of prompt_string_pointer. */
|
|
reset_readline_prompt ();
|
|
#endif
|
|
|
|
if (current_readline_line == 0)
|
|
return (EOF);
|
|
|
|
current_readline_line_index = 0;
|
|
line_len = strlen (current_readline_line);
|
|
|
|
current_readline_line = (char *)xrealloc (current_readline_line, 2 + line_len);
|
|
current_readline_line[line_len++] = '\n';
|
|
current_readline_line[line_len] = '\0';
|
|
}
|
|
|
|
if (current_readline_line[current_readline_line_index] == 0)
|
|
{
|
|
free (current_readline_line);
|
|
current_readline_line = (char *)NULL;
|
|
return (yy_readline_get ());
|
|
}
|
|
else
|
|
{
|
|
c = current_readline_line[current_readline_line_index++];
|
|
return (c);
|
|
}
|
|
}
|
|
|
|
static int
|
|
yy_readline_unget (c)
|
|
int c;
|
|
{
|
|
if (current_readline_line_index && current_readline_line)
|
|
current_readline_line[--current_readline_line_index] = c;
|
|
return (c);
|
|
}
|
|
|
|
void
|
|
with_input_from_stdin ()
|
|
{
|
|
INPUT_STREAM location;
|
|
|
|
if (bash_input.type != st_stdin && stream_on_stack (st_stdin) == 0)
|
|
{
|
|
location.string = current_readline_line;
|
|
init_yy_io (yy_readline_get, yy_readline_unget,
|
|
st_stdin, "readline stdin", location);
|
|
}
|
|
}
|
|
|
|
#else /* !READLINE */
|
|
|
|
void
|
|
with_input_from_stdin ()
|
|
{
|
|
with_input_from_stream (stdin, "stdin");
|
|
}
|
|
#endif /* !READLINE */
|
|
|
|
/* **************************************************************** */
|
|
/* */
|
|
/* Let input come from STRING. STRING is zero terminated. */
|
|
/* */
|
|
/* **************************************************************** */
|
|
|
|
static int
|
|
yy_string_get ()
|
|
{
|
|
register char *string;
|
|
register unsigned char c;
|
|
|
|
string = bash_input.location.string;
|
|
|
|
/* If the string doesn't exist, or is empty, EOF found. */
|
|
if (string && *string)
|
|
{
|
|
c = *string++;
|
|
bash_input.location.string = string;
|
|
return (c);
|
|
}
|
|
else
|
|
return (EOF);
|
|
}
|
|
|
|
static int
|
|
yy_string_unget (c)
|
|
int c;
|
|
{
|
|
*(--bash_input.location.string) = c;
|
|
return (c);
|
|
}
|
|
|
|
void
|
|
with_input_from_string (string, name)
|
|
char *string;
|
|
const char *name;
|
|
{
|
|
INPUT_STREAM location;
|
|
|
|
location.string = string;
|
|
init_yy_io (yy_string_get, yy_string_unget, st_string, name, location);
|
|
}
|
|
|
|
/* Count the number of characters we've consumed from bash_input.location.string
|
|
and read into shell_input_line, but have not returned from shell_getc.
|
|
That is the true input location. Rewind bash_input.location.string by
|
|
that number of characters, so it points to the last character actually
|
|
consumed by the parser. */
|
|
static void
|
|
rewind_input_string ()
|
|
{
|
|
int xchars;
|
|
|
|
/* number of unconsumed characters in the input -- XXX need to take newlines
|
|
into account, e.g., $(...\n) */
|
|
xchars = shell_input_line_len - shell_input_line_index;
|
|
if (bash_input.location.string[-1] == '\n')
|
|
xchars++;
|
|
|
|
/* XXX - how to reflect bash_input.location.string back to string passed to
|
|
parse_and_execute or xparse_dolparen? xparse_dolparen needs to know how
|
|
far into the string we parsed. parse_and_execute knows where bash_input.
|
|
location.string is, and how far from orig_string that is -- that's the
|
|
number of characters the command consumed. */
|
|
|
|
/* bash_input.location.string - xchars should be where we parsed to */
|
|
/* need to do more validation on xchars value for sanity -- test cases. */
|
|
bash_input.location.string -= xchars;
|
|
}
|
|
|
|
/* **************************************************************** */
|
|
/* */
|
|
/* Let input come from STREAM. */
|
|
/* */
|
|
/* **************************************************************** */
|
|
|
|
/* These two functions used to test the value of the HAVE_RESTARTABLE_SYSCALLS
|
|
define, and just use getc/ungetc if it was defined, but since bash
|
|
installs its signal handlers without the SA_RESTART flag, some signals
|
|
(like SIGCHLD, SIGWINCH, etc.) received during a read(2) will not cause
|
|
the read to be restarted. We need to restart it ourselves. */
|
|
|
|
static int
|
|
yy_stream_get ()
|
|
{
|
|
int result;
|
|
|
|
result = EOF;
|
|
if (bash_input.location.file)
|
|
{
|
|
#if 0
|
|
if (interactive)
|
|
interrupt_immediately++;
|
|
#endif
|
|
|
|
/* XXX - don't need terminate_immediately; getc_with_restart checks
|
|
for terminating signals itself if read returns < 0 */
|
|
result = getc_with_restart (bash_input.location.file);
|
|
|
|
#if 0
|
|
if (interactive)
|
|
interrupt_immediately--;
|
|
#endif
|
|
}
|
|
return (result);
|
|
}
|
|
|
|
static int
|
|
yy_stream_unget (c)
|
|
int c;
|
|
{
|
|
return (ungetc_with_restart (c, bash_input.location.file));
|
|
}
|
|
|
|
void
|
|
with_input_from_stream (stream, name)
|
|
FILE *stream;
|
|
const char *name;
|
|
{
|
|
INPUT_STREAM location;
|
|
|
|
location.file = stream;
|
|
init_yy_io (yy_stream_get, yy_stream_unget, st_stream, name, location);
|
|
}
|
|
|
|
typedef struct stream_saver {
|
|
struct stream_saver *next;
|
|
BASH_INPUT bash_input;
|
|
int line;
|
|
#if defined (BUFFERED_INPUT)
|
|
BUFFERED_STREAM *bstream;
|
|
#endif /* BUFFERED_INPUT */
|
|
} STREAM_SAVER;
|
|
|
|
/* The globally known line number. */
|
|
int line_number = 0;
|
|
|
|
/* The line number offset set by assigning to LINENO. Not currently used. */
|
|
int line_number_base = 0;
|
|
|
|
#if defined (COND_COMMAND)
|
|
static int cond_lineno;
|
|
static int cond_token;
|
|
#endif
|
|
|
|
STREAM_SAVER *stream_list = (STREAM_SAVER *)NULL;
|
|
|
|
void
|
|
push_stream (reset_lineno)
|
|
int reset_lineno;
|
|
{
|
|
STREAM_SAVER *saver = (STREAM_SAVER *)xmalloc (sizeof (STREAM_SAVER));
|
|
|
|
xbcopy ((char *)&bash_input, (char *)&(saver->bash_input), sizeof (BASH_INPUT));
|
|
|
|
#if defined (BUFFERED_INPUT)
|
|
saver->bstream = (BUFFERED_STREAM *)NULL;
|
|
/* If we have a buffered stream, clear out buffers[fd]. */
|
|
if (bash_input.type == st_bstream && bash_input.location.buffered_fd >= 0)
|
|
saver->bstream = set_buffered_stream (bash_input.location.buffered_fd,
|
|
(BUFFERED_STREAM *)NULL);
|
|
#endif /* BUFFERED_INPUT */
|
|
|
|
saver->line = line_number;
|
|
bash_input.name = (char *)NULL;
|
|
saver->next = stream_list;
|
|
stream_list = saver;
|
|
EOF_Reached = 0;
|
|
if (reset_lineno)
|
|
line_number = 0;
|
|
}
|
|
|
|
void
|
|
pop_stream ()
|
|
{
|
|
if (!stream_list)
|
|
EOF_Reached = 1;
|
|
else
|
|
{
|
|
STREAM_SAVER *saver = stream_list;
|
|
|
|
EOF_Reached = 0;
|
|
stream_list = stream_list->next;
|
|
|
|
init_yy_io (saver->bash_input.getter,
|
|
saver->bash_input.ungetter,
|
|
saver->bash_input.type,
|
|
saver->bash_input.name,
|
|
saver->bash_input.location);
|
|
|
|
#if defined (BUFFERED_INPUT)
|
|
/* If we have a buffered stream, restore buffers[fd]. */
|
|
/* If the input file descriptor was changed while this was on the
|
|
save stack, update the buffered fd to the new file descriptor and
|
|
re-establish the buffer <-> bash_input fd correspondence. */
|
|
if (bash_input.type == st_bstream && bash_input.location.buffered_fd >= 0)
|
|
{
|
|
if (bash_input_fd_changed)
|
|
{
|
|
bash_input_fd_changed = 0;
|
|
if (default_buffered_input >= 0)
|
|
{
|
|
bash_input.location.buffered_fd = default_buffered_input;
|
|
saver->bstream->b_fd = default_buffered_input;
|
|
SET_CLOSE_ON_EXEC (default_buffered_input);
|
|
}
|
|
}
|
|
/* XXX could free buffered stream returned as result here. */
|
|
set_buffered_stream (bash_input.location.buffered_fd, saver->bstream);
|
|
}
|
|
#endif /* BUFFERED_INPUT */
|
|
|
|
line_number = saver->line;
|
|
|
|
FREE (saver->bash_input.name);
|
|
free (saver);
|
|
}
|
|
}
|
|
|
|
/* Return 1 if a stream of type TYPE is saved on the stack. */
|
|
int
|
|
stream_on_stack (type)
|
|
enum stream_type type;
|
|
{
|
|
register STREAM_SAVER *s;
|
|
|
|
for (s = stream_list; s; s = s->next)
|
|
if (s->bash_input.type == type)
|
|
return 1;
|
|
return 0;
|
|
}
|
|
|
|
/* Save the current token state and return it in a malloced array. */
|
|
int *
|
|
save_token_state ()
|
|
{
|
|
int *ret;
|
|
|
|
ret = (int *)xmalloc (4 * sizeof (int));
|
|
ret[0] = last_read_token;
|
|
ret[1] = token_before_that;
|
|
ret[2] = two_tokens_ago;
|
|
ret[3] = current_token;
|
|
return ret;
|
|
}
|
|
|
|
void
|
|
restore_token_state (ts)
|
|
int *ts;
|
|
{
|
|
if (ts == 0)
|
|
return;
|
|
last_read_token = ts[0];
|
|
token_before_that = ts[1];
|
|
two_tokens_ago = ts[2];
|
|
current_token = ts[3];
|
|
}
|
|
|
|
/*
|
|
* This is used to inhibit alias expansion and reserved word recognition
|
|
* inside case statement pattern lists. A `case statement pattern list' is:
|
|
*
|
|
* everything between the `in' in a `case word in' and the next ')'
|
|
* or `esac'
|
|
* everything between a `;;' and the next `)' or `esac'
|
|
*/
|
|
|
|
#if defined (ALIAS) || defined (DPAREN_ARITHMETIC)
|
|
|
|
#define END_OF_ALIAS 0
|
|
|
|
/*
|
|
* Pseudo-global variables used in implementing token-wise alias expansion.
|
|
*/
|
|
|
|
/*
|
|
* Pushing and popping strings. This works together with shell_getc to
|
|
* implement alias expansion on a per-token basis.
|
|
*/
|
|
|
|
#define PSH_ALIAS 0x01
|
|
#define PSH_DPAREN 0x02
|
|
#define PSH_SOURCE 0x04
|
|
|
|
typedef struct string_saver {
|
|
struct string_saver *next;
|
|
int expand_alias; /* Value to set expand_alias to when string is popped. */
|
|
char *saved_line;
|
|
#if defined (ALIAS)
|
|
alias_t *expander; /* alias that caused this line to be pushed. */
|
|
#endif
|
|
size_t saved_line_size, saved_line_index;
|
|
int saved_line_terminator;
|
|
int flags;
|
|
} STRING_SAVER;
|
|
|
|
STRING_SAVER *pushed_string_list = (STRING_SAVER *)NULL;
|
|
|
|
/*
|
|
* Push the current shell_input_line onto a stack of such lines and make S
|
|
* the current input. Used when expanding aliases. EXPAND is used to set
|
|
* the value of expand_next_token when the string is popped, so that the
|
|
* word after the alias in the original line is handled correctly when the
|
|
* alias expands to multiple words. TOKEN is the token that was expanded
|
|
* into S; it is saved and used to prevent infinite recursive expansion.
|
|
*/
|
|
static void
|
|
push_string (s, expand, ap)
|
|
char *s;
|
|
int expand;
|
|
alias_t *ap;
|
|
{
|
|
STRING_SAVER *temp = (STRING_SAVER *)xmalloc (sizeof (STRING_SAVER));
|
|
|
|
temp->expand_alias = expand;
|
|
temp->saved_line = shell_input_line;
|
|
temp->saved_line_size = shell_input_line_size;
|
|
temp->saved_line_index = shell_input_line_index;
|
|
temp->saved_line_terminator = shell_input_line_terminator;
|
|
temp->flags = 0;
|
|
#if defined (ALIAS)
|
|
temp->expander = ap;
|
|
if (ap)
|
|
temp->flags = PSH_ALIAS;
|
|
#endif
|
|
temp->next = pushed_string_list;
|
|
pushed_string_list = temp;
|
|
|
|
#if defined (ALIAS)
|
|
if (ap)
|
|
ap->flags |= AL_BEINGEXPANDED;
|
|
#endif
|
|
|
|
shell_input_line = s;
|
|
shell_input_line_size = STRLEN (s);
|
|
shell_input_line_index = 0;
|
|
shell_input_line_terminator = '\0';
|
|
#if 0
|
|
parser_state &= ~PST_ALEXPNEXT; /* XXX */
|
|
#endif
|
|
|
|
set_line_mbstate ();
|
|
}
|
|
|
|
/*
|
|
* Make the top of the pushed_string stack be the current shell input.
|
|
* Only called when there is something on the stack. Called from shell_getc
|
|
* when it thinks it has consumed the string generated by an alias expansion
|
|
* and needs to return to the original input line.
|
|
*/
|
|
static void
|
|
pop_string ()
|
|
{
|
|
STRING_SAVER *t;
|
|
|
|
FREE (shell_input_line);
|
|
shell_input_line = pushed_string_list->saved_line;
|
|
shell_input_line_index = pushed_string_list->saved_line_index;
|
|
shell_input_line_size = pushed_string_list->saved_line_size;
|
|
shell_input_line_terminator = pushed_string_list->saved_line_terminator;
|
|
|
|
if (pushed_string_list->expand_alias)
|
|
parser_state |= PST_ALEXPNEXT;
|
|
else
|
|
parser_state &= ~PST_ALEXPNEXT;
|
|
|
|
t = pushed_string_list;
|
|
pushed_string_list = pushed_string_list->next;
|
|
|
|
#if defined (ALIAS)
|
|
if (t->expander)
|
|
t->expander->flags &= ~AL_BEINGEXPANDED;
|
|
#endif
|
|
|
|
free ((char *)t);
|
|
|
|
set_line_mbstate ();
|
|
}
|
|
|
|
static void
|
|
free_string_list ()
|
|
{
|
|
register STRING_SAVER *t, *t1;
|
|
|
|
for (t = pushed_string_list; t; )
|
|
{
|
|
t1 = t->next;
|
|
FREE (t->saved_line);
|
|
#if defined (ALIAS)
|
|
if (t->expander)
|
|
t->expander->flags &= ~AL_BEINGEXPANDED;
|
|
#endif
|
|
free ((char *)t);
|
|
t = t1;
|
|
}
|
|
pushed_string_list = (STRING_SAVER *)NULL;
|
|
}
|
|
|
|
#endif /* ALIAS || DPAREN_ARITHMETIC */
|
|
|
|
void
|
|
free_pushed_string_input ()
|
|
{
|
|
#if defined (ALIAS) || defined (DPAREN_ARITHMETIC)
|
|
free_string_list ();
|
|
#endif
|
|
}
|
|
|
|
int
|
|
parser_expanding_alias ()
|
|
{
|
|
return (expanding_alias ());
|
|
}
|
|
|
|
void
|
|
parser_save_alias ()
|
|
{
|
|
#if defined (ALIAS) || defined (DPAREN_ARITHMETIC)
|
|
push_string ((char *)NULL, 0, (alias_t *)NULL);
|
|
pushed_string_list->flags = PSH_SOURCE; /* XXX - for now */
|
|
#else
|
|
;
|
|
#endif
|
|
}
|
|
|
|
void
|
|
parser_restore_alias ()
|
|
{
|
|
#if defined (ALIAS) || defined (DPAREN_ARITHMETIC)
|
|
if (pushed_string_list)
|
|
pop_string ();
|
|
#else
|
|
;
|
|
#endif
|
|
}
|
|
|
|
void
|
|
clear_shell_input_line ()
|
|
{
|
|
if (shell_input_line)
|
|
shell_input_line[shell_input_line_index = 0] = '\0';
|
|
}
|
|
|
|
/* Return a line of text, taken from wherever yylex () reads input.
|
|
If there is no more input, then we return NULL. If REMOVE_QUOTED_NEWLINE
|
|
is non-zero, we remove unquoted \<newline> pairs. This is used by
|
|
read_secondary_line to read here documents. */
|
|
static char *
|
|
read_a_line (remove_quoted_newline)
|
|
int remove_quoted_newline;
|
|
{
|
|
static char *line_buffer = (char *)NULL;
|
|
static int buffer_size = 0;
|
|
int indx, c, peekc, pass_next;
|
|
|
|
#if defined (READLINE)
|
|
if (no_line_editing && SHOULD_PROMPT ())
|
|
#else
|
|
if (SHOULD_PROMPT ())
|
|
#endif
|
|
print_prompt ();
|
|
|
|
pass_next = indx = 0;
|
|
while (1)
|
|
{
|
|
/* Allow immediate exit if interrupted during input. */
|
|
QUIT;
|
|
|
|
c = yy_getc ();
|
|
|
|
/* Ignore null bytes in input. */
|
|
if (c == 0)
|
|
{
|
|
#if 0
|
|
internal_warning ("read_a_line: ignored null byte in input");
|
|
#endif
|
|
continue;
|
|
}
|
|
|
|
/* If there is no more input, then we return NULL. */
|
|
if (c == EOF)
|
|
{
|
|
if (interactive && bash_input.type == st_stream)
|
|
clearerr (stdin);
|
|
if (indx == 0)
|
|
return ((char *)NULL);
|
|
c = '\n';
|
|
}
|
|
|
|
/* `+2' in case the final character in the buffer is a newline. */
|
|
RESIZE_MALLOCED_BUFFER (line_buffer, indx, 2, buffer_size, 128);
|
|
|
|
/* IF REMOVE_QUOTED_NEWLINES is non-zero, we are reading a
|
|
here document with an unquoted delimiter. In this case,
|
|
the line will be expanded as if it were in double quotes.
|
|
We allow a backslash to escape the next character, but we
|
|
need to treat the backslash specially only if a backslash
|
|
quoting a backslash-newline pair appears in the line. */
|
|
if (pass_next)
|
|
{
|
|
line_buffer[indx++] = c;
|
|
pass_next = 0;
|
|
}
|
|
else if (c == '\\' && remove_quoted_newline)
|
|
{
|
|
QUIT;
|
|
peekc = yy_getc ();
|
|
if (peekc == '\n')
|
|
{
|
|
line_number++;
|
|
continue; /* Make the unquoted \<newline> pair disappear. */
|
|
}
|
|
else
|
|
{
|
|
yy_ungetc (peekc);
|
|
pass_next = 1;
|
|
line_buffer[indx++] = c; /* Preserve the backslash. */
|
|
}
|
|
}
|
|
else
|
|
line_buffer[indx++] = c;
|
|
|
|
if (c == '\n')
|
|
{
|
|
line_buffer[indx] = '\0';
|
|
return (line_buffer);
|
|
}
|
|
}
|
|
}
|
|
|
|
/* Return a line as in read_a_line (), but insure that the prompt is
|
|
the secondary prompt. This is used to read the lines of a here
|
|
document. REMOVE_QUOTED_NEWLINE is non-zero if we should remove
|
|
newlines quoted with backslashes while reading the line. It is
|
|
non-zero unless the delimiter of the here document was quoted. */
|
|
char *
|
|
read_secondary_line (remove_quoted_newline)
|
|
int remove_quoted_newline;
|
|
{
|
|
char *ret;
|
|
int n, c;
|
|
|
|
prompt_string_pointer = &ps2_prompt;
|
|
if (SHOULD_PROMPT())
|
|
prompt_again ();
|
|
ret = read_a_line (remove_quoted_newline);
|
|
#if defined (HISTORY)
|
|
if (ret && remember_on_history && (parser_state & PST_HEREDOC))
|
|
{
|
|
/* To make adding the here-document body right, we need to rely on
|
|
history_delimiting_chars() returning \n for the first line of the
|
|
here-document body and the null string for the second and subsequent
|
|
lines, so we avoid double newlines.
|
|
current_command_line_count == 2 for the first line of the body. */
|
|
|
|
current_command_line_count++;
|
|
maybe_add_history (ret);
|
|
}
|
|
#endif /* HISTORY */
|
|
return ret;
|
|
}
|
|
|
|
/* **************************************************************** */
|
|
/* */
|
|
/* YYLEX () */
|
|
/* */
|
|
/* **************************************************************** */
|
|
|
|
/* Reserved words. These are only recognized as the first word of a
|
|
command. */
|
|
STRING_INT_ALIST word_token_alist[] = {
|
|
{ "if", IF },
|
|
{ "then", THEN },
|
|
{ "else", ELSE },
|
|
{ "elif", ELIF },
|
|
{ "fi", FI },
|
|
{ "case", CASE },
|
|
{ "esac", ESAC },
|
|
{ "for", FOR },
|
|
#if defined (SELECT_COMMAND)
|
|
{ "select", SELECT },
|
|
#endif
|
|
{ "while", WHILE },
|
|
{ "until", UNTIL },
|
|
{ "do", DO },
|
|
{ "done", DONE },
|
|
{ "in", IN },
|
|
{ "function", FUNCTION },
|
|
#if defined (COMMAND_TIMING)
|
|
{ "time", TIME },
|
|
#endif
|
|
{ "{", '{' },
|
|
{ "}", '}' },
|
|
{ "!", BANG },
|
|
#if defined (COND_COMMAND)
|
|
{ "[[", COND_START },
|
|
{ "]]", COND_END },
|
|
#endif
|
|
#if defined (COPROCESS_SUPPORT)
|
|
{ "coproc", COPROC },
|
|
#endif
|
|
{ (char *)NULL, 0}
|
|
};
|
|
|
|
/* other tokens that can be returned by read_token() */
|
|
STRING_INT_ALIST other_token_alist[] = {
|
|
/* Multiple-character tokens with special values */
|
|
{ "--", TIMEIGN },
|
|
{ "-p", TIMEOPT },
|
|
{ "&&", AND_AND },
|
|
{ "||", OR_OR },
|
|
{ ">>", GREATER_GREATER },
|
|
{ "<<", LESS_LESS },
|
|
{ "<&", LESS_AND },
|
|
{ ">&", GREATER_AND },
|
|
{ ";;", SEMI_SEMI },
|
|
{ ";&", SEMI_AND },
|
|
{ ";;&", SEMI_SEMI_AND },
|
|
{ "<<-", LESS_LESS_MINUS },
|
|
{ "<<<", LESS_LESS_LESS },
|
|
{ "&>", AND_GREATER },
|
|
{ "&>>", AND_GREATER_GREATER },
|
|
{ "<>", LESS_GREATER },
|
|
{ ">|", GREATER_BAR },
|
|
{ "|&", BAR_AND },
|
|
{ "EOF", yacc_EOF },
|
|
/* Tokens whose value is the character itself */
|
|
{ ">", '>' },
|
|
{ "<", '<' },
|
|
{ "-", '-' },
|
|
{ "{", '{' },
|
|
{ "}", '}' },
|
|
{ ";", ';' },
|
|
{ "(", '(' },
|
|
{ ")", ')' },
|
|
{ "|", '|' },
|
|
{ "&", '&' },
|
|
{ "newline", '\n' },
|
|
{ (char *)NULL, 0}
|
|
};
|
|
|
|
/* others not listed here:
|
|
WORD look at yylval.word
|
|
ASSIGNMENT_WORD look at yylval.word
|
|
NUMBER look at yylval.number
|
|
ARITH_CMD look at yylval.word_list
|
|
ARITH_FOR_EXPRS look at yylval.word_list
|
|
COND_CMD look at yylval.command
|
|
*/
|
|
|
|
/* These are used by read_token_word, but appear up here so that shell_getc
|
|
can use them to decide when to add otherwise blank lines to the history. */
|
|
|
|
/* The primary delimiter stack. */
|
|
struct dstack dstack = { (char *)NULL, 0, 0 };
|
|
|
|
/* A temporary delimiter stack to be used when decoding prompt strings.
|
|
This is needed because command substitutions in prompt strings (e.g., PS2)
|
|
can screw up the parser's quoting state. */
|
|
static struct dstack temp_dstack = { (char *)NULL, 0, 0 };
|
|
|
|
/* Macro for accessing the top delimiter on the stack. Returns the
|
|
delimiter or zero if none. */
|
|
#define current_delimiter(ds) \
|
|
(ds.delimiter_depth ? ds.delimiters[ds.delimiter_depth - 1] : 0)
|
|
|
|
#define push_delimiter(ds, character) \
|
|
do \
|
|
{ \
|
|
if (ds.delimiter_depth + 2 > ds.delimiter_space) \
|
|
ds.delimiters = (char *)xrealloc \
|
|
(ds.delimiters, (ds.delimiter_space += 10) * sizeof (char)); \
|
|
ds.delimiters[ds.delimiter_depth] = character; \
|
|
ds.delimiter_depth++; \
|
|
} \
|
|
while (0)
|
|
|
|
#define pop_delimiter(ds) ds.delimiter_depth--
|
|
|
|
/* Return the next shell input character. This always reads characters
|
|
from shell_input_line; when that line is exhausted, it is time to
|
|
read the next line. This is called by read_token when the shell is
|
|
processing normal command input. */
|
|
|
|
/* This implements one-character lookahead/lookbehind across physical input
|
|
lines, to avoid something being lost because it's pushed back with
|
|
shell_ungetc when we're at the start of a line. */
|
|
static int eol_ungetc_lookahead = 0;
|
|
|
|
static int
|
|
shell_getc (remove_quoted_newline)
|
|
int remove_quoted_newline;
|
|
{
|
|
register int i;
|
|
int c, truncating, last_was_backslash;
|
|
unsigned char uc;
|
|
|
|
QUIT;
|
|
|
|
last_was_backslash = 0;
|
|
if (sigwinch_received)
|
|
{
|
|
sigwinch_received = 0;
|
|
get_new_window_size (0, (int *)0, (int *)0);
|
|
}
|
|
|
|
if (eol_ungetc_lookahead)
|
|
{
|
|
c = eol_ungetc_lookahead;
|
|
eol_ungetc_lookahead = 0;
|
|
return (c);
|
|
}
|
|
|
|
#if defined (ALIAS) || defined (DPAREN_ARITHMETIC)
|
|
/* If shell_input_line[shell_input_line_index] == 0, but there is
|
|
something on the pushed list of strings, then we don't want to go
|
|
off and get another line. We let the code down below handle it. */
|
|
|
|
if (!shell_input_line || ((!shell_input_line[shell_input_line_index]) &&
|
|
(pushed_string_list == (STRING_SAVER *)NULL)))
|
|
#else /* !ALIAS && !DPAREN_ARITHMETIC */
|
|
if (!shell_input_line || !shell_input_line[shell_input_line_index])
|
|
#endif /* !ALIAS && !DPAREN_ARITHMETIC */
|
|
{
|
|
line_number++;
|
|
|
|
/* Let's not let one really really long line blow up memory allocation */
|
|
if (shell_input_line && shell_input_line_size >= 32768)
|
|
{
|
|
free (shell_input_line);
|
|
shell_input_line = 0;
|
|
shell_input_line_size = 0;
|
|
}
|
|
|
|
restart_read:
|
|
|
|
/* Allow immediate exit if interrupted during input. */
|
|
QUIT;
|
|
|
|
i = truncating = 0;
|
|
shell_input_line_terminator = 0;
|
|
|
|
/* If the shell is interatctive, but not currently printing a prompt
|
|
(interactive_shell && interactive == 0), we don't want to print
|
|
notifies or cleanup the jobs -- we want to defer it until we do
|
|
print the next prompt. */
|
|
if (interactive_shell == 0 || SHOULD_PROMPT())
|
|
{
|
|
#if defined (JOB_CONTROL)
|
|
/* This can cause a problem when reading a command as the result
|
|
of a trap, when the trap is called from flush_child. This call
|
|
had better not cause jobs to disappear from the job table in
|
|
that case, or we will have big trouble. */
|
|
notify_and_cleanup ();
|
|
#else /* !JOB_CONTROL */
|
|
cleanup_dead_jobs ();
|
|
#endif /* !JOB_CONTROL */
|
|
}
|
|
|
|
#if defined (READLINE)
|
|
if (no_line_editing && SHOULD_PROMPT())
|
|
#else
|
|
if (SHOULD_PROMPT())
|
|
#endif
|
|
print_prompt ();
|
|
|
|
if (bash_input.type == st_stream)
|
|
clearerr (stdin);
|
|
|
|
while (1)
|
|
{
|
|
c = yy_getc ();
|
|
|
|
/* Allow immediate exit if interrupted during input. */
|
|
QUIT;
|
|
|
|
if (c == '\0')
|
|
{
|
|
#if 0
|
|
internal_warning ("shell_getc: ignored null byte in input");
|
|
#endif
|
|
continue;
|
|
}
|
|
|
|
/* Theoretical overflow */
|
|
/* If we can't put 256 bytes more into the buffer, allocate
|
|
everything we can and fill it as full as we can. */
|
|
/* XXX - we ignore rest of line using `truncating' flag */
|
|
if (shell_input_line_size > (SIZE_MAX - 256))
|
|
{
|
|
size_t n;
|
|
|
|
n = SIZE_MAX - i; /* how much more can we put into the buffer? */
|
|
if (n <= 2) /* we have to save 1 for the newline added below */
|
|
{
|
|
if (truncating == 0)
|
|
internal_warning(_("shell_getc: shell_input_line_size (%zu) exceeds SIZE_MAX (%lu): line truncated"), shell_input_line_size, (unsigned long)SIZE_MAX);
|
|
shell_input_line[i] = '\0';
|
|
truncating = 1;
|
|
}
|
|
if (shell_input_line_size < SIZE_MAX)
|
|
{
|
|
shell_input_line_size = SIZE_MAX;
|
|
shell_input_line = xrealloc (shell_input_line, shell_input_line_size);
|
|
}
|
|
}
|
|
else
|
|
RESIZE_MALLOCED_BUFFER (shell_input_line, i, 2, shell_input_line_size, 256);
|
|
|
|
if (c == EOF)
|
|
{
|
|
if (bash_input.type == st_stream)
|
|
clearerr (stdin);
|
|
|
|
if (i == 0)
|
|
shell_input_line_terminator = EOF;
|
|
|
|
shell_input_line[i] = '\0';
|
|
break;
|
|
}
|
|
|
|
if (truncating == 0 || c == '\n')
|
|
shell_input_line[i++] = c;
|
|
|
|
if (c == '\n')
|
|
{
|
|
shell_input_line[--i] = '\0';
|
|
current_command_line_count++;
|
|
break;
|
|
}
|
|
|
|
last_was_backslash = last_was_backslash == 0 && c == '\\';
|
|
}
|
|
|
|
shell_input_line_index = 0;
|
|
shell_input_line_len = i; /* == strlen (shell_input_line) */
|
|
|
|
set_line_mbstate ();
|
|
|
|
#if defined (HISTORY)
|
|
if (remember_on_history && shell_input_line && shell_input_line[0])
|
|
{
|
|
char *expansions;
|
|
# if defined (BANG_HISTORY)
|
|
int old_hist;
|
|
|
|
/* If the current delimiter is a single quote, we should not be
|
|
performing history expansion, even if we're on a different
|
|
line from the original single quote. */
|
|
old_hist = history_expansion_inhibited;
|
|
if (current_delimiter (dstack) == '\'')
|
|
history_expansion_inhibited = 1;
|
|
# endif
|
|
/* Calling with a third argument of 1 allows remember_on_history to
|
|
determine whether or not the line is saved to the history list */
|
|
expansions = pre_process_line (shell_input_line, 1, 1);
|
|
# if defined (BANG_HISTORY)
|
|
history_expansion_inhibited = old_hist;
|
|
# endif
|
|
if (expansions != shell_input_line)
|
|
{
|
|
free (shell_input_line);
|
|
shell_input_line = expansions;
|
|
shell_input_line_len = shell_input_line ?
|
|
strlen (shell_input_line) : 0;
|
|
if (shell_input_line_len == 0)
|
|
current_command_line_count--;
|
|
|
|
/* We have to force the xrealloc below because we don't know
|
|
the true allocated size of shell_input_line anymore. */
|
|
shell_input_line_size = shell_input_line_len;
|
|
|
|
set_line_mbstate ();
|
|
}
|
|
}
|
|
/* Try to do something intelligent with blank lines encountered while
|
|
entering multi-line commands. XXX - this is grotesque */
|
|
else if (remember_on_history && shell_input_line &&
|
|
shell_input_line[0] == '\0' &&
|
|
current_command_line_count > 1)
|
|
{
|
|
if (current_delimiter (dstack))
|
|
/* We know shell_input_line[0] == 0 and we're reading some sort of
|
|
quoted string. This means we've got a line consisting of only
|
|
a newline in a quoted string. We want to make sure this line
|
|
gets added to the history. */
|
|
maybe_add_history (shell_input_line);
|
|
else
|
|
{
|
|
char *hdcs;
|
|
hdcs = history_delimiting_chars (shell_input_line);
|
|
if (hdcs && hdcs[0] == ';')
|
|
maybe_add_history (shell_input_line);
|
|
}
|
|
}
|
|
|
|
#endif /* HISTORY */
|
|
|
|
if (shell_input_line)
|
|
{
|
|
/* Lines that signify the end of the shell's input should not be
|
|
echoed. We should not echo lines while parsing command
|
|
substitutions with recursive calls into the parsing engine; those
|
|
should only be echoed once when we read the word. That is the
|
|
reason for the test against shell_eof_token, which is set to a
|
|
right paren when parsing the contents of command substitutions. */
|
|
if (echo_input_at_read && (shell_input_line[0] ||
|
|
shell_input_line_terminator != EOF) &&
|
|
shell_eof_token == 0)
|
|
fprintf (stderr, "%s\n", shell_input_line);
|
|
}
|
|
else
|
|
{
|
|
shell_input_line_size = 0;
|
|
prompt_string_pointer = ¤t_prompt_string;
|
|
if (SHOULD_PROMPT ())
|
|
prompt_again ();
|
|
goto restart_read;
|
|
}
|
|
|
|
/* Add the newline to the end of this string, iff the string does
|
|
not already end in an EOF character. */
|
|
if (shell_input_line_terminator != EOF)
|
|
{
|
|
if (shell_input_line_size < SIZE_MAX-3 && (shell_input_line_len+3 > shell_input_line_size))
|
|
shell_input_line = (char *)xrealloc (shell_input_line,
|
|
1 + (shell_input_line_size += 2));
|
|
|
|
/* Don't add a newline to a string that ends with a backslash if we're
|
|
going to be removing quoted newlines, since that will eat the
|
|
backslash. Add another backslash instead (will be removed by
|
|
word expansion). */
|
|
if (bash_input.type == st_string && expanding_alias() == 0 && last_was_backslash && c == EOF && remove_quoted_newline)
|
|
shell_input_line[shell_input_line_len] = '\\';
|
|
else
|
|
shell_input_line[shell_input_line_len] = '\n';
|
|
shell_input_line[shell_input_line_len + 1] = '\0';
|
|
|
|
set_line_mbstate ();
|
|
}
|
|
}
|
|
|
|
next_alias_char:
|
|
uc = shell_input_line[shell_input_line_index];
|
|
|
|
if (uc)
|
|
shell_input_line_index++;
|
|
|
|
#if defined (ALIAS) || defined (DPAREN_ARITHMETIC)
|
|
/* If UC is NULL, we have reached the end of the current input string. If
|
|
pushed_string_list is non-empty, it's time to pop to the previous string
|
|
because we have fully consumed the result of the last alias expansion.
|
|
Do it transparently; just return the next character of the string popped
|
|
to. */
|
|
/* If pushed_string_list != 0 but pushed_string_list->expander == 0 (not
|
|
currently tested) and the flags value is not PSH_SOURCE, we are not
|
|
parsing an alias, we have just saved one (push_string, when called by
|
|
the parse_dparen code) In this case, just go on as well. The PSH_SOURCE
|
|
case is handled below. */
|
|
pop_alias:
|
|
if (uc == 0 && pushed_string_list && pushed_string_list->flags != PSH_SOURCE)
|
|
{
|
|
pop_string ();
|
|
uc = shell_input_line[shell_input_line_index];
|
|
if (uc)
|
|
shell_input_line_index++;
|
|
}
|
|
#endif /* ALIAS || DPAREN_ARITHMETIC */
|
|
|
|
if MBTEST(uc == '\\' && remove_quoted_newline && shell_input_line[shell_input_line_index] == '\n')
|
|
{
|
|
if (SHOULD_PROMPT ())
|
|
prompt_again ();
|
|
line_number++;
|
|
/* What do we do here if we're expanding an alias whose definition
|
|
includes an escaped newline? If that's the last character in the
|
|
alias expansion, we just pop the pushed string list (recall that
|
|
we inhibit the appending of a space in mk_alexpansion() if newline
|
|
is the last character). If it's not the last character, we need
|
|
to consume the quoted newline and move to the next character in
|
|
the expansion. */
|
|
#if defined (ALIAS)
|
|
if (expanding_alias () && shell_input_line[shell_input_line_index+1] == '\0')
|
|
{
|
|
uc = 0;
|
|
goto pop_alias;
|
|
}
|
|
else if (expanding_alias () && shell_input_line[shell_input_line_index+1] != '\0')
|
|
{
|
|
shell_input_line_index++; /* skip newline */
|
|
goto next_alias_char; /* and get next character */
|
|
}
|
|
else
|
|
#endif
|
|
goto restart_read;
|
|
}
|
|
|
|
if (uc == 0 && shell_input_line_terminator == EOF)
|
|
return ((shell_input_line_index != 0) ? '\n' : EOF);
|
|
|
|
#if defined (ALIAS) || defined (DPAREN_ARITHMETIC)
|
|
/* We already know that we are not parsing an alias expansion because of the
|
|
check for expanding_alias() above. This knows how parse_and_execute
|
|
handles switching to st_string input while an alias is being expanded,
|
|
hence the check for pushed_string_list without pushed_string_list->expander
|
|
and the check for PSH_SOURCE as pushed_string_list->flags.
|
|
parse_and_execute and parse_string both change the input type to st_string
|
|
and place the string to be parsed and executed into location.string, so
|
|
we should not stop reading that until the pointer is '\0'.
|
|
The check for shell_input_line_terminator may be superfluous.
|
|
|
|
This solves the problem of `.' inside a multi-line alias with embedded
|
|
newlines executing things out of order. */
|
|
if (uc == 0 && bash_input.type == st_string && *bash_input.location.string &&
|
|
pushed_string_list && pushed_string_list->flags == PSH_SOURCE &&
|
|
shell_input_line_terminator == 0)
|
|
{
|
|
shell_input_line_index = 0;
|
|
goto restart_read;
|
|
}
|
|
#endif
|
|
|
|
return (uc);
|
|
}
|
|
|
|
/* Put C back into the input for the shell. This might need changes for
|
|
HANDLE_MULTIBYTE around EOLs. Since we (currently) never push back a
|
|
character different than we read, shell_input_line_property doesn't need
|
|
to change when manipulating shell_input_line. The define for
|
|
last_shell_getc_is_singlebyte should take care of it, though. */
|
|
static void
|
|
shell_ungetc (c)
|
|
int c;
|
|
{
|
|
if (shell_input_line && shell_input_line_index)
|
|
shell_input_line[--shell_input_line_index] = c;
|
|
else
|
|
eol_ungetc_lookahead = c;
|
|
}
|
|
|
|
char *
|
|
parser_remaining_input ()
|
|
{
|
|
if (shell_input_line == 0)
|
|
return 0;
|
|
if (shell_input_line_index < 0 || shell_input_line_index >= shell_input_line_len)
|
|
return ""; /* XXX */
|
|
return (shell_input_line + shell_input_line_index);
|
|
}
|
|
|
|
#ifdef INCLUDE_UNUSED
|
|
/* Back the input pointer up by one, effectively `ungetting' a character. */
|
|
static void
|
|
shell_ungetchar ()
|
|
{
|
|
if (shell_input_line && shell_input_line_index)
|
|
shell_input_line_index--;
|
|
}
|
|
#endif
|
|
|
|
/* Discard input until CHARACTER is seen, then push that character back
|
|
onto the input stream. */
|
|
static void
|
|
discard_until (character)
|
|
int character;
|
|
{
|
|
int c;
|
|
|
|
while ((c = shell_getc (0)) != EOF && c != character)
|
|
;
|
|
|
|
if (c != EOF)
|
|
shell_ungetc (c);
|
|
}
|
|
|
|
void
|
|
execute_variable_command (command, vname)
|
|
char *command, *vname;
|
|
{
|
|
char *last_lastarg;
|
|
sh_parser_state_t ps;
|
|
|
|
save_parser_state (&ps);
|
|
last_lastarg = get_string_value ("_");
|
|
if (last_lastarg)
|
|
last_lastarg = savestring (last_lastarg);
|
|
|
|
parse_and_execute (savestring (command), vname, SEVAL_NONINT|SEVAL_NOHIST);
|
|
|
|
restore_parser_state (&ps);
|
|
bind_variable ("_", last_lastarg, 0);
|
|
FREE (last_lastarg);
|
|
|
|
if (token_to_read == '\n') /* reset_parser was called */
|
|
token_to_read = 0;
|
|
}
|
|
|
|
void
|
|
push_token (x)
|
|
int x;
|
|
{
|
|
two_tokens_ago = token_before_that;
|
|
token_before_that = last_read_token;
|
|
last_read_token = current_token;
|
|
|
|
current_token = x;
|
|
}
|
|
|
|
/* Place to remember the token. We try to keep the buffer
|
|
at a reasonable size, but it can grow. */
|
|
static char *token = (char *)NULL;
|
|
|
|
/* Current size of the token buffer. */
|
|
static int token_buffer_size;
|
|
|
|
/* Command to read_token () explaining what we want it to do. */
|
|
#define READ 0
|
|
#define RESET 1
|
|
#define prompt_is_ps1 \
|
|
(!prompt_string_pointer || prompt_string_pointer == &ps1_prompt)
|
|
|
|
/* Function for yyparse to call. yylex keeps track of
|
|
the last two tokens read, and calls read_token. */
|
|
static int
|
|
yylex ()
|
|
{
|
|
if (interactive && (current_token == 0 || current_token == '\n'))
|
|
{
|
|
/* Before we print a prompt, we might have to check mailboxes.
|
|
We do this only if it is time to do so. Notice that only here
|
|
is the mail alarm reset; nothing takes place in check_mail ()
|
|
except the checking of mail. Please don't change this. */
|
|
if (prompt_is_ps1 && parse_and_execute_level == 0 && time_to_check_mail ())
|
|
{
|
|
check_mail ();
|
|
reset_mail_timer ();
|
|
}
|
|
|
|
/* Avoid printing a prompt if we're not going to read anything, e.g.
|
|
after resetting the parser with read_token (RESET). */
|
|
if (token_to_read == 0 && SHOULD_PROMPT ())
|
|
prompt_again ();
|
|
}
|
|
|
|
two_tokens_ago = token_before_that;
|
|
token_before_that = last_read_token;
|
|
last_read_token = current_token;
|
|
current_token = read_token (READ);
|
|
|
|
if ((parser_state & PST_EOFTOKEN) && current_token == shell_eof_token)
|
|
{
|
|
current_token = yacc_EOF;
|
|
if (bash_input.type == st_string)
|
|
rewind_input_string ();
|
|
}
|
|
parser_state &= ~PST_EOFTOKEN;
|
|
|
|
return (current_token);
|
|
}
|
|
|
|
/* When non-zero, we have read the required tokens
|
|
which allow ESAC to be the next one read. */
|
|
static int esacs_needed_count;
|
|
|
|
static void
|
|
push_heredoc (r)
|
|
REDIRECT *r;
|
|
{
|
|
if (need_here_doc >= HEREDOC_MAX)
|
|
{
|
|
last_command_exit_value = EX_BADUSAGE;
|
|
need_here_doc = 0;
|
|
report_syntax_error (_("maximum here-document count exceeded"));
|
|
reset_parser ();
|
|
exit_shell (last_command_exit_value);
|
|
}
|
|
redir_stack[need_here_doc++] = r;
|
|
}
|
|
|
|
void
|
|
gather_here_documents ()
|
|
{
|
|
int r;
|
|
|
|
r = 0;
|
|
here_doc_first_line = 1;
|
|
while (need_here_doc > 0)
|
|
{
|
|
parser_state |= PST_HEREDOC;
|
|
make_here_document (redir_stack[r++], line_number);
|
|
parser_state &= ~PST_HEREDOC;
|
|
need_here_doc--;
|
|
redir_stack[r - 1] = 0; /* XXX */
|
|
}
|
|
here_doc_first_line = 0; /* just in case */
|
|
}
|
|
|
|
/* When non-zero, an open-brace used to create a group is awaiting a close
|
|
brace partner. */
|
|
static int open_brace_count;
|
|
|
|
/* In the following three macros, `token' is always last_read_token */
|
|
|
|
/* Are we in the middle of parsing a redirection where we are about to read
|
|
a word? This is used to make sure alias expansion doesn't happen in the
|
|
middle of a redirection, even though we're parsing a simple command. */
|
|
#define parsing_redirection(token) \
|
|
(token == '<' || token == '>' || \
|
|
token == GREATER_GREATER || token == GREATER_BAR || \
|
|
token == LESS_GREATER || token == LESS_LESS_MINUS || \
|
|
token == LESS_LESS || token == LESS_LESS_LESS || \
|
|
token == LESS_AND || token == GREATER_AND || token == AND_GREATER)
|
|
|
|
/* Is `token' one that will allow a WORD to be read in a command position?
|
|
We can read a simple command name on which we should attempt alias expansion
|
|
or we can read an assignment statement. */
|
|
#define command_token_position(token) \
|
|
(((token) == ASSIGNMENT_WORD) || \
|
|
((parser_state&PST_REDIRLIST) && parsing_redirection(token) == 0) || \
|
|
((token) != SEMI_SEMI && (token) != SEMI_AND && (token) != SEMI_SEMI_AND && reserved_word_acceptable(token)))
|
|
|
|
/* Are we in a position where we can read an assignment statement? */
|
|
#define assignment_acceptable(token) \
|
|
(command_token_position(token) && ((parser_state & PST_CASEPAT) == 0))
|
|
|
|
/* Check to see if TOKEN is a reserved word and return the token
|
|
value if it is. */
|
|
#define CHECK_FOR_RESERVED_WORD(tok) \
|
|
do { \
|
|
if (!dollar_present && !quoted && \
|
|
reserved_word_acceptable (last_read_token)) \
|
|
{ \
|
|
int i; \
|
|
for (i = 0; word_token_alist[i].word != (char *)NULL; i++) \
|
|
if (STREQ (tok, word_token_alist[i].word)) \
|
|
{ \
|
|
if ((parser_state & PST_CASEPAT) && (word_token_alist[i].token != ESAC)) \
|
|
break; \
|
|
if (word_token_alist[i].token == TIME && time_command_acceptable () == 0) \
|
|
break; \
|
|
if ((parser_state & PST_CASEPAT) && last_read_token == '|' && word_token_alist[i].token == ESAC) \
|
|
break; /* Posix grammar rule 4 */ \
|
|
if (word_token_alist[i].token == ESAC) \
|
|
parser_state &= ~(PST_CASEPAT|PST_CASESTMT); \
|
|
else if (word_token_alist[i].token == CASE) \
|
|
parser_state |= PST_CASESTMT; \
|
|
else if (word_token_alist[i].token == COND_END) \
|
|
parser_state &= ~(PST_CONDCMD|PST_CONDEXPR); \
|
|
else if (word_token_alist[i].token == COND_START) \
|
|
parser_state |= PST_CONDCMD; \
|
|
else if (word_token_alist[i].token == '{') \
|
|
open_brace_count++; \
|
|
else if (word_token_alist[i].token == '}' && open_brace_count) \
|
|
open_brace_count--; \
|
|
return (word_token_alist[i].token); \
|
|
} \
|
|
} \
|
|
} while (0)
|
|
|
|
#if defined (ALIAS)
|
|
|
|
/* OK, we have a token. Let's try to alias expand it, if (and only if)
|
|
it's eligible.
|
|
|
|
It is eligible for expansion if EXPAND_ALIASES is set, and
|
|
the token is unquoted and the last token read was a command
|
|
separator (or expand_next_token is set), and we are currently
|
|
processing an alias (pushed_string_list is non-empty) and this
|
|
token is not the same as the current or any previously
|
|
processed alias.
|
|
|
|
Special cases that disqualify:
|
|
In a pattern list in a case statement (parser_state & PST_CASEPAT). */
|
|
|
|
static char *
|
|
mk_alexpansion (s)
|
|
char *s;
|
|
{
|
|
int l;
|
|
char *r;
|
|
|
|
l = strlen (s);
|
|
r = xmalloc (l + 2);
|
|
strcpy (r, s);
|
|
/* If the last character in the alias is a newline, don't add a trailing
|
|
space to the expansion. Works with shell_getc above. */
|
|
if (r[l - 1] != ' ' && r[l - 1] != '\n' && shellmeta(r[l - 1]) == 0)
|
|
r[l++] = ' ';
|
|
r[l] = '\0';
|
|
return r;
|
|
}
|
|
|
|
static int
|
|
alias_expand_token (tokstr)
|
|
char *tokstr;
|
|
{
|
|
char *expanded;
|
|
alias_t *ap;
|
|
|
|
if (((parser_state & PST_ALEXPNEXT) || command_token_position (last_read_token)) &&
|
|
(parser_state & PST_CASEPAT) == 0)
|
|
{
|
|
ap = find_alias (tokstr);
|
|
|
|
/* Currently expanding this token. */
|
|
if (ap && (ap->flags & AL_BEINGEXPANDED))
|
|
return (NO_EXPANSION);
|
|
|
|
/* mk_alexpansion puts an extra space on the end of the alias expansion,
|
|
so the lookahead by the parser works right. If this gets changed,
|
|
make sure the code in shell_getc that deals with reaching the end of
|
|
an expanded alias is changed with it. */
|
|
expanded = ap ? mk_alexpansion (ap->value) : (char *)NULL;
|
|
|
|
if (expanded)
|
|
{
|
|
push_string (expanded, ap->flags & AL_EXPANDNEXT, ap);
|
|
return (RE_READ_TOKEN);
|
|
}
|
|
else
|
|
/* This is an eligible token that does not have an expansion. */
|
|
return (NO_EXPANSION);
|
|
}
|
|
return (NO_EXPANSION);
|
|
}
|
|
#endif /* ALIAS */
|
|
|
|
static int
|
|
time_command_acceptable ()
|
|
{
|
|
#if defined (COMMAND_TIMING)
|
|
int i;
|
|
|
|
if (posixly_correct && shell_compatibility_level > 41)
|
|
{
|
|
/* Quick check of the rest of the line to find the next token. If it
|
|
begins with a `-', Posix says to not return `time' as the token.
|
|
This was interp 267. */
|
|
i = shell_input_line_index;
|
|
while (i < shell_input_line_len && (shell_input_line[i] == ' ' || shell_input_line[i] == '\t'))
|
|
i++;
|
|
if (shell_input_line[i] == '-')
|
|
return 0;
|
|
}
|
|
|
|
switch (last_read_token)
|
|
{
|
|
case 0:
|
|
case ';':
|
|
case '\n':
|
|
if (token_before_that == '|')
|
|
return (0);
|
|
/* FALLTHROUGH */
|
|
case AND_AND:
|
|
case OR_OR:
|
|
case '&':
|
|
case WHILE:
|
|
case DO:
|
|
case UNTIL:
|
|
case IF:
|
|
case THEN:
|
|
case ELIF:
|
|
case ELSE:
|
|
case '{': /* } */
|
|
case '(': /* )( */
|
|
case ')': /* only valid in case statement */
|
|
case BANG: /* ! time pipeline */
|
|
case TIME: /* time time pipeline */
|
|
case TIMEOPT: /* time -p time pipeline */
|
|
case TIMEIGN: /* time -p -- ... */
|
|
return 1;
|
|
default:
|
|
return 0;
|
|
}
|
|
#else
|
|
return 0;
|
|
#endif /* COMMAND_TIMING */
|
|
}
|
|
|
|
/* Handle special cases of token recognition:
|
|
IN is recognized if the last token was WORD and the token
|
|
before that was FOR or CASE or SELECT.
|
|
|
|
DO is recognized if the last token was WORD and the token
|
|
before that was FOR or SELECT.
|
|
|
|
ESAC is recognized if the last token caused `esacs_needed_count'
|
|
to be set
|
|
|
|
`{' is recognized if the last token as WORD and the token
|
|
before that was FUNCTION, or if we just parsed an arithmetic
|
|
`for' command.
|
|
|
|
`}' is recognized if there is an unclosed `{' present.
|
|
|
|
`-p' is returned as TIMEOPT if the last read token was TIME.
|
|
`--' is returned as TIMEIGN if the last read token was TIMEOPT.
|
|
|
|
']]' is returned as COND_END if the parser is currently parsing
|
|
a conditional expression ((parser_state & PST_CONDEXPR) != 0)
|
|
|
|
`time' is returned as TIME if and only if it is immediately
|
|
preceded by one of `;', `\n', `||', `&&', or `&'.
|
|
*/
|
|
|
|
static int
|
|
special_case_tokens (tokstr)
|
|
char *tokstr;
|
|
{
|
|
if ((last_read_token == WORD) &&
|
|
#if defined (SELECT_COMMAND)
|
|
((token_before_that == FOR) || (token_before_that == CASE) || (token_before_that == SELECT)) &&
|
|
#else
|
|
((token_before_that == FOR) || (token_before_that == CASE)) &&
|
|
#endif
|
|
(tokstr[0] == 'i' && tokstr[1] == 'n' && tokstr[2] == 0))
|
|
{
|
|
if (token_before_that == CASE)
|
|
{
|
|
parser_state |= PST_CASEPAT;
|
|
esacs_needed_count++;
|
|
}
|
|
return (IN);
|
|
}
|
|
|
|
if (last_read_token == WORD &&
|
|
#if defined (SELECT_COMMAND)
|
|
(token_before_that == FOR || token_before_that == SELECT) &&
|
|
#else
|
|
(token_before_that == FOR) &&
|
|
#endif
|
|
(tokstr[0] == 'd' && tokstr[1] == 'o' && tokstr[2] == '\0'))
|
|
return (DO);
|
|
|
|
/* Ditto for ESAC in the CASE case.
|
|
Specifically, this handles "case word in esac", which is a legal
|
|
construct, certainly because someone will pass an empty arg to the
|
|
case construct, and we don't want it to barf. Of course, we should
|
|
insist that the case construct has at least one pattern in it, but
|
|
the designers disagree. */
|
|
if (esacs_needed_count)
|
|
{
|
|
esacs_needed_count--;
|
|
if (STREQ (tokstr, "esac"))
|
|
{
|
|
parser_state &= ~PST_CASEPAT;
|
|
return (ESAC);
|
|
}
|
|
}
|
|
|
|
/* The start of a shell function definition. */
|
|
if (parser_state & PST_ALLOWOPNBRC)
|
|
{
|
|
parser_state &= ~PST_ALLOWOPNBRC;
|
|
if (tokstr[0] == '{' && tokstr[1] == '\0') /* } */
|
|
{
|
|
open_brace_count++;
|
|
function_bstart = line_number;
|
|
return ('{'); /* } */
|
|
}
|
|
}
|
|
|
|
/* We allow a `do' after a for ((...)) without an intervening
|
|
list_terminator */
|
|
if (last_read_token == ARITH_FOR_EXPRS && tokstr[0] == 'd' && tokstr[1] == 'o' && !tokstr[2])
|
|
return (DO);
|
|
if (last_read_token == ARITH_FOR_EXPRS && tokstr[0] == '{' && tokstr[1] == '\0') /* } */
|
|
{
|
|
open_brace_count++;
|
|
return ('{'); /* } */
|
|
}
|
|
|
|
if (open_brace_count && reserved_word_acceptable (last_read_token) && tokstr[0] == '}' && !tokstr[1])
|
|
{
|
|
open_brace_count--; /* { */
|
|
return ('}');
|
|
}
|
|
|
|
#if defined (COMMAND_TIMING)
|
|
/* Handle -p after `time'. */
|
|
if (last_read_token == TIME && tokstr[0] == '-' && tokstr[1] == 'p' && !tokstr[2])
|
|
return (TIMEOPT);
|
|
/* Handle -- after `time -p'. */
|
|
if (last_read_token == TIMEOPT && tokstr[0] == '-' && tokstr[1] == '-' && !tokstr[2])
|
|
return (TIMEIGN);
|
|
#endif
|
|
|
|
#if defined (COND_COMMAND) /* [[ */
|
|
if ((parser_state & PST_CONDEXPR) && tokstr[0] == ']' && tokstr[1] == ']' && tokstr[2] == '\0')
|
|
return (COND_END);
|
|
#endif
|
|
|
|
return (-1);
|
|
}
|
|
|
|
/* Called from shell.c when Control-C is typed at top level. Or
|
|
by the error rule at top level. */
|
|
void
|
|
reset_parser ()
|
|
{
|
|
dstack.delimiter_depth = 0; /* No delimiters found so far. */
|
|
open_brace_count = 0;
|
|
|
|
#if defined (EXTENDED_GLOB)
|
|
/* Reset to global value of extended glob */
|
|
if (parser_state & PST_EXTPAT)
|
|
extended_glob = global_extglob;
|
|
#endif
|
|
|
|
parser_state = 0;
|
|
here_doc_first_line = 0;
|
|
|
|
#if defined (ALIAS) || defined (DPAREN_ARITHMETIC)
|
|
if (pushed_string_list)
|
|
free_string_list ();
|
|
#endif /* ALIAS || DPAREN_ARITHMETIC */
|
|
|
|
/* This is where we resynchronize to the next newline on error/reset */
|
|
if (shell_input_line)
|
|
{
|
|
free (shell_input_line);
|
|
shell_input_line = (char *)NULL;
|
|
shell_input_line_size = shell_input_line_index = 0;
|
|
}
|
|
|
|
FREE (word_desc_to_read);
|
|
word_desc_to_read = (WORD_DESC *)NULL;
|
|
|
|
eol_ungetc_lookahead = 0;
|
|
|
|
current_token = '\n'; /* XXX */
|
|
last_read_token = '\n';
|
|
token_to_read = '\n';
|
|
}
|
|
|
|
/* Read the next token. Command can be READ (normal operation) or
|
|
RESET (to normalize state). */
|
|
static int
|
|
read_token (command)
|
|
int command;
|
|
{
|
|
int character; /* Current character. */
|
|
int peek_char; /* Temporary look-ahead character. */
|
|
int result; /* The thing to return. */
|
|
|
|
if (command == RESET)
|
|
{
|
|
reset_parser ();
|
|
return ('\n');
|
|
}
|
|
|
|
if (token_to_read)
|
|
{
|
|
result = token_to_read;
|
|
if (token_to_read == WORD || token_to_read == ASSIGNMENT_WORD)
|
|
{
|
|
yylval.word = word_desc_to_read;
|
|
word_desc_to_read = (WORD_DESC *)NULL;
|
|
}
|
|
token_to_read = 0;
|
|
return (result);
|
|
}
|
|
|
|
#if defined (COND_COMMAND)
|
|
if ((parser_state & (PST_CONDCMD|PST_CONDEXPR)) == PST_CONDCMD)
|
|
{
|
|
cond_lineno = line_number;
|
|
parser_state |= PST_CONDEXPR;
|
|
yylval.command = parse_cond_command ();
|
|
if (cond_token != COND_END)
|
|
{
|
|
cond_error ();
|
|
return (-1);
|
|
}
|
|
token_to_read = COND_END;
|
|
parser_state &= ~(PST_CONDEXPR|PST_CONDCMD);
|
|
return (COND_CMD);
|
|
}
|
|
#endif
|
|
|
|
#if defined (ALIAS)
|
|
/* This is a place to jump back to once we have successfully expanded a
|
|
token with an alias and pushed the string with push_string () */
|
|
re_read_token:
|
|
#endif /* ALIAS */
|
|
|
|
/* Read a single word from input. Start by skipping blanks. */
|
|
while ((character = shell_getc (1)) != EOF && shellblank (character))
|
|
;
|
|
|
|
if (character == EOF)
|
|
{
|
|
EOF_Reached = 1;
|
|
return (yacc_EOF);
|
|
}
|
|
|
|
if MBTEST(character == '#' && (!interactive || interactive_comments))
|
|
{
|
|
/* A comment. Discard until EOL or EOF, and then return a newline. */
|
|
discard_until ('\n');
|
|
shell_getc (0);
|
|
character = '\n'; /* this will take the next if statement and return. */
|
|
}
|
|
|
|
if (character == '\n')
|
|
{
|
|
/* If we're about to return an unquoted newline, we can go and collect
|
|
the text of any pending here document. */
|
|
if (need_here_doc)
|
|
gather_here_documents ();
|
|
|
|
#if defined (ALIAS)
|
|
parser_state &= ~PST_ALEXPNEXT;
|
|
#endif /* ALIAS */
|
|
|
|
parser_state &= ~PST_ASSIGNOK;
|
|
|
|
return (character);
|
|
}
|
|
|
|
if (parser_state & PST_REGEXP)
|
|
goto tokword;
|
|
|
|
/* Shell meta-characters. */
|
|
if MBTEST(shellmeta (character) && ((parser_state & PST_DBLPAREN) == 0))
|
|
{
|
|
#if defined (ALIAS)
|
|
/* Turn off alias tokenization iff this character sequence would
|
|
not leave us ready to read a command. */
|
|
if (character == '<' || character == '>')
|
|
parser_state &= ~PST_ALEXPNEXT;
|
|
#endif /* ALIAS */
|
|
|
|
parser_state &= ~PST_ASSIGNOK;
|
|
|
|
/* If we are parsing a command substitution and we have read a character
|
|
that marks the end of it, don't bother to skip over quoted newlines
|
|
when we read the next token. We're just interested in a character
|
|
that will turn this into a two-character token, so we let the higher
|
|
layers deal with quoted newlines following the command substitution. */
|
|
if ((parser_state & PST_CMDSUBST) && character == shell_eof_token)
|
|
peek_char = shell_getc (0);
|
|
else
|
|
peek_char = shell_getc (1);
|
|
|
|
if (character == peek_char)
|
|
{
|
|
switch (character)
|
|
{
|
|
case '<':
|
|
/* If '<' then we could be at "<<" or at "<<-". We have to
|
|
look ahead one more character. */
|
|
peek_char = shell_getc (1);
|
|
if MBTEST(peek_char == '-')
|
|
return (LESS_LESS_MINUS);
|
|
else if MBTEST(peek_char == '<')
|
|
return (LESS_LESS_LESS);
|
|
else
|
|
{
|
|
shell_ungetc (peek_char);
|
|
return (LESS_LESS);
|
|
}
|
|
|
|
case '>':
|
|
return (GREATER_GREATER);
|
|
|
|
case ';':
|
|
parser_state |= PST_CASEPAT;
|
|
#if defined (ALIAS)
|
|
parser_state &= ~PST_ALEXPNEXT;
|
|
#endif /* ALIAS */
|
|
|
|
peek_char = shell_getc (1);
|
|
if MBTEST(peek_char == '&')
|
|
return (SEMI_SEMI_AND);
|
|
else
|
|
{
|
|
shell_ungetc (peek_char);
|
|
return (SEMI_SEMI);
|
|
}
|
|
|
|
case '&':
|
|
return (AND_AND);
|
|
|
|
case '|':
|
|
return (OR_OR);
|
|
|
|
#if defined (DPAREN_ARITHMETIC) || defined (ARITH_FOR_COMMAND)
|
|
case '(': /* ) */
|
|
result = parse_dparen (character);
|
|
if (result == -2)
|
|
break;
|
|
else
|
|
return result;
|
|
#endif
|
|
}
|
|
}
|
|
else if MBTEST(character == '<' && peek_char == '&')
|
|
return (LESS_AND);
|
|
else if MBTEST(character == '>' && peek_char == '&')
|
|
return (GREATER_AND);
|
|
else if MBTEST(character == '<' && peek_char == '>')
|
|
return (LESS_GREATER);
|
|
else if MBTEST(character == '>' && peek_char == '|')
|
|
return (GREATER_BAR);
|
|
else if MBTEST(character == '&' && peek_char == '>')
|
|
{
|
|
peek_char = shell_getc (1);
|
|
if MBTEST(peek_char == '>')
|
|
return (AND_GREATER_GREATER);
|
|
else
|
|
{
|
|
shell_ungetc (peek_char);
|
|
return (AND_GREATER);
|
|
}
|
|
}
|
|
else if MBTEST(character == '|' && peek_char == '&')
|
|
return (BAR_AND);
|
|
else if MBTEST(character == ';' && peek_char == '&')
|
|
{
|
|
parser_state |= PST_CASEPAT;
|
|
#if defined (ALIAS)
|
|
parser_state &= ~PST_ALEXPNEXT;
|
|
#endif /* ALIAS */
|
|
return (SEMI_AND);
|
|
}
|
|
|
|
shell_ungetc (peek_char);
|
|
|
|
/* If we look like we are reading the start of a function
|
|
definition, then let the reader know about it so that
|
|
we will do the right thing with `{'. */
|
|
if MBTEST(character == ')' && last_read_token == '(' && token_before_that == WORD)
|
|
{
|
|
parser_state |= PST_ALLOWOPNBRC;
|
|
#if defined (ALIAS)
|
|
parser_state &= ~PST_ALEXPNEXT;
|
|
#endif /* ALIAS */
|
|
function_dstart = line_number;
|
|
}
|
|
|
|
/* case pattern lists may be preceded by an optional left paren. If
|
|
we're not trying to parse a case pattern list, the left paren
|
|
indicates a subshell. */
|
|
if MBTEST(character == '(' && (parser_state & PST_CASEPAT) == 0) /* ) */
|
|
parser_state |= PST_SUBSHELL;
|
|
/*(*/
|
|
else if MBTEST((parser_state & PST_CASEPAT) && character == ')')
|
|
parser_state &= ~PST_CASEPAT;
|
|
/*(*/
|
|
else if MBTEST((parser_state & PST_SUBSHELL) && character == ')')
|
|
parser_state &= ~PST_SUBSHELL;
|
|
|
|
#if defined (PROCESS_SUBSTITUTION)
|
|
/* Check for the constructs which introduce process substitution.
|
|
Shells running in `posix mode' don't do process substitution. */
|
|
if MBTEST(posixly_correct || ((character != '>' && character != '<') || peek_char != '(')) /*)*/
|
|
#endif /* PROCESS_SUBSTITUTION */
|
|
return (character);
|
|
}
|
|
|
|
/* Hack <&- (close stdin) case. Also <&N- (dup and close). */
|
|
if MBTEST(character == '-' && (last_read_token == LESS_AND || last_read_token == GREATER_AND))
|
|
return (character);
|
|
|
|
tokword:
|
|
/* Okay, if we got this far, we have to read a word. Read one,
|
|
and then check it against the known ones. */
|
|
result = read_token_word (character);
|
|
#if defined (ALIAS)
|
|
if (result == RE_READ_TOKEN)
|
|
goto re_read_token;
|
|
#endif
|
|
return result;
|
|
}
|
|
|
|
/*
|
|
* Match a $(...) or other grouping construct. This has to handle embedded
|
|
* quoted strings ('', ``, "") and nested constructs. It also must handle
|
|
* reprompting the user, if necessary, after reading a newline, and returning
|
|
* correct error values if it reads EOF.
|
|
*/
|
|
#define P_FIRSTCLOSE 0x0001
|
|
#define P_ALLOWESC 0x0002
|
|
#define P_DQUOTE 0x0004
|
|
#define P_COMMAND 0x0008 /* parsing a command, so look for comments */
|
|
#define P_BACKQUOTE 0x0010 /* parsing a backquoted command substitution */
|
|
#define P_ARRAYSUB 0x0020 /* parsing a [...] array subscript for assignment */
|
|
#define P_DOLBRACE 0x0040 /* parsing a ${...} construct */
|
|
|
|
/* Lexical state while parsing a grouping construct or $(...). */
|
|
#define LEX_WASDOL 0x001
|
|
#define LEX_CKCOMMENT 0x002
|
|
#define LEX_INCOMMENT 0x004
|
|
#define LEX_PASSNEXT 0x008
|
|
#define LEX_RESWDOK 0x010
|
|
#define LEX_CKCASE 0x020
|
|
#define LEX_INCASE 0x040
|
|
#define LEX_INHEREDOC 0x080
|
|
#define LEX_HEREDELIM 0x100 /* reading here-doc delimiter */
|
|
#define LEX_STRIPDOC 0x200 /* <<- strip tabs from here doc delim */
|
|
#define LEX_QUOTEDDOC 0x400 /* here doc with quoted delim */
|
|
#define LEX_INWORD 0x800
|
|
|
|
#define COMSUB_META(ch) ((ch) == ';' || (ch) == '&' || (ch) == '|')
|
|
|
|
#define CHECK_NESTRET_ERROR() \
|
|
do { \
|
|
if (nestret == &matched_pair_error) \
|
|
{ \
|
|
free (ret); \
|
|
return &matched_pair_error; \
|
|
} \
|
|
} while (0)
|
|
|
|
#define APPEND_NESTRET() \
|
|
do { \
|
|
if (nestlen) \
|
|
{ \
|
|
RESIZE_MALLOCED_BUFFER (ret, retind, nestlen, retsize, 64); \
|
|
strcpy (ret + retind, nestret); \
|
|
retind += nestlen; \
|
|
} \
|
|
} while (0)
|
|
|
|
static char matched_pair_error;
|
|
|
|
static char *
|
|
parse_matched_pair (qc, open, close, lenp, flags)
|
|
int qc; /* `"' if this construct is within double quotes */
|
|
int open, close;
|
|
int *lenp, flags;
|
|
{
|
|
int count, ch, tflags;
|
|
int nestlen, ttranslen, start_lineno;
|
|
char *ret, *nestret, *ttrans;
|
|
int retind, retsize, rflags;
|
|
int dolbrace_state;
|
|
|
|
dolbrace_state = (flags & P_DOLBRACE) ? DOLBRACE_PARAM : 0;
|
|
|
|
/*itrace("parse_matched_pair[%d]: open = %c close = %c flags = %d", line_number, open, close, flags);*/
|
|
count = 1;
|
|
tflags = 0;
|
|
|
|
if ((flags & P_COMMAND) && qc != '`' && qc != '\'' && qc != '"' && (flags & P_DQUOTE) == 0)
|
|
tflags |= LEX_CKCOMMENT;
|
|
|
|
/* RFLAGS is the set of flags we want to pass to recursive calls. */
|
|
rflags = (qc == '"') ? P_DQUOTE : (flags & P_DQUOTE);
|
|
|
|
ret = (char *)xmalloc (retsize = 64);
|
|
retind = 0;
|
|
|
|
start_lineno = line_number;
|
|
while (count)
|
|
{
|
|
ch = shell_getc (qc != '\'' && (tflags & (LEX_PASSNEXT)) == 0);
|
|
|
|
if (ch == EOF)
|
|
{
|
|
free (ret);
|
|
parser_error (start_lineno, _("unexpected EOF while looking for matching `%c'"), close);
|
|
EOF_Reached = 1; /* XXX */
|
|
return (&matched_pair_error);
|
|
}
|
|
|
|
/* Possible reprompting. */
|
|
if (ch == '\n' && SHOULD_PROMPT ())
|
|
prompt_again ();
|
|
|
|
/* Don't bother counting parens or doing anything else if in a comment
|
|
or part of a case statement */
|
|
if (tflags & LEX_INCOMMENT)
|
|
{
|
|
/* Add this character. */
|
|
RESIZE_MALLOCED_BUFFER (ret, retind, 1, retsize, 64);
|
|
ret[retind++] = ch;
|
|
|
|
if (ch == '\n')
|
|
tflags &= ~LEX_INCOMMENT;
|
|
|
|
continue;
|
|
}
|
|
|
|
/* Not exactly right yet, should handle shell metacharacters, too. If
|
|
any changes are made to this test, make analogous changes to subst.c:
|
|
extract_delimited_string(). */
|
|
else if MBTEST((tflags & LEX_CKCOMMENT) && (tflags & LEX_INCOMMENT) == 0 && ch == '#' && (retind == 0 || ret[retind-1] == '\n' || shellblank (ret[retind - 1])))
|
|
tflags |= LEX_INCOMMENT;
|
|
|
|
if (tflags & LEX_PASSNEXT) /* last char was backslash */
|
|
{
|
|
tflags &= ~LEX_PASSNEXT;
|
|
if (qc != '\'' && ch == '\n') /* double-quoted \<newline> disappears. */
|
|
{
|
|
if (retind > 0)
|
|
retind--; /* swallow previously-added backslash */
|
|
continue;
|
|
}
|
|
|
|
RESIZE_MALLOCED_BUFFER (ret, retind, 2, retsize, 64);
|
|
if MBTEST(ch == CTLESC)
|
|
ret[retind++] = CTLESC;
|
|
ret[retind++] = ch;
|
|
continue;
|
|
}
|
|
/* If we're reparsing the input (e.g., from parse_string_to_word_list),
|
|
we've already prepended CTLESC to single-quoted results of $'...'.
|
|
We may want to do this for other CTLESC-quoted characters in
|
|
reparse, too. */
|
|
else if MBTEST((parser_state & PST_REPARSE) && open == '\'' && (ch == CTLESC || ch == CTLNUL))
|
|
{
|
|
RESIZE_MALLOCED_BUFFER (ret, retind, 1, retsize, 64);
|
|
ret[retind++] = ch;
|
|
continue;
|
|
}
|
|
else if MBTEST(ch == CTLESC || ch == CTLNUL) /* special shell escapes */
|
|
{
|
|
RESIZE_MALLOCED_BUFFER (ret, retind, 2, retsize, 64);
|
|
ret[retind++] = CTLESC;
|
|
ret[retind++] = ch;
|
|
continue;
|
|
}
|
|
else if MBTEST(ch == close) /* ending delimiter */
|
|
count--;
|
|
/* handle nested ${...} specially. */
|
|
else if MBTEST(open != close && (tflags & LEX_WASDOL) && open == '{' && ch == open) /* } */
|
|
count++;
|
|
else if MBTEST(((flags & P_FIRSTCLOSE) == 0) && ch == open) /* nested begin */
|
|
count++;
|
|
|
|
/* Add this character. */
|
|
RESIZE_MALLOCED_BUFFER (ret, retind, 1, retsize, 64);
|
|
ret[retind++] = ch;
|
|
|
|
/* If we just read the ending character, don't bother continuing. */
|
|
if (count == 0)
|
|
break;
|
|
|
|
if (open == '\'') /* '' inside grouping construct */
|
|
{
|
|
if MBTEST((flags & P_ALLOWESC) && ch == '\\')
|
|
tflags |= LEX_PASSNEXT;
|
|
continue;
|
|
}
|
|
|
|
if MBTEST(ch == '\\') /* backslashes */
|
|
tflags |= LEX_PASSNEXT;
|
|
|
|
/* Based on which dolstate is currently in (param, op, or word),
|
|
decide what the op is. We're really only concerned if it's % or
|
|
#, so we can turn on a flag that says whether or not we should
|
|
treat single quotes as special when inside a double-quoted
|
|
${...}. This logic must agree with subst.c:extract_dollar_brace_string
|
|
since they share the same defines. */
|
|
/* FLAG POSIX INTERP 221 */
|
|
if (flags & P_DOLBRACE)
|
|
{
|
|
/* ${param%[%]word} */
|
|
if MBTEST(dolbrace_state == DOLBRACE_PARAM && ch == '%' && retind > 1)
|
|
dolbrace_state = DOLBRACE_QUOTE;
|
|
/* ${param#[#]word} */
|
|
else if MBTEST(dolbrace_state == DOLBRACE_PARAM && ch == '#' && retind > 1)
|
|
dolbrace_state = DOLBRACE_QUOTE;
|
|
/* ${param/[/]pat/rep} */
|
|
else if MBTEST(dolbrace_state == DOLBRACE_PARAM && ch == '/' && retind > 1)
|
|
dolbrace_state = DOLBRACE_QUOTE2; /* XXX */
|
|
/* ${param^[^]pat} */
|
|
else if MBTEST(dolbrace_state == DOLBRACE_PARAM && ch == '^' && retind > 1)
|
|
dolbrace_state = DOLBRACE_QUOTE;
|
|
/* ${param,[,]pat} */
|
|
else if MBTEST(dolbrace_state == DOLBRACE_PARAM && ch == ',' && retind > 1)
|
|
dolbrace_state = DOLBRACE_QUOTE;
|
|
else if MBTEST(dolbrace_state == DOLBRACE_PARAM && strchr ("#%^,~:-=?+/", ch) != 0)
|
|
dolbrace_state = DOLBRACE_OP;
|
|
else if MBTEST(dolbrace_state == DOLBRACE_OP && strchr ("#%^,~:-=?+/", ch) == 0)
|
|
dolbrace_state = DOLBRACE_WORD;
|
|
}
|
|
|
|
/* The big hammer. Single quotes aren't special in double quotes. The
|
|
problem is that Posix used to say the single quotes are semi-special:
|
|
within a double-quoted ${...} construct "an even number of
|
|
unescaped double-quotes or single-quotes, if any, shall occur." */
|
|
/* This was changed in Austin Group Interp 221 */
|
|
if MBTEST(posixly_correct && shell_compatibility_level > 41 && dolbrace_state != DOLBRACE_QUOTE && dolbrace_state != DOLBRACE_QUOTE2 && (flags & P_DQUOTE) && (flags & P_DOLBRACE) && ch == '\'')
|
|
continue;
|
|
|
|
/* Could also check open == '`' if we want to parse grouping constructs
|
|
inside old-style command substitution. */
|
|
if (open != close) /* a grouping construct */
|
|
{
|
|
if MBTEST(shellquote (ch))
|
|
{
|
|
/* '', ``, or "" inside $(...) or other grouping construct. */
|
|
push_delimiter (dstack, ch);
|
|
if MBTEST((tflags & LEX_WASDOL) && ch == '\'') /* $'...' inside group */
|
|
nestret = parse_matched_pair (ch, ch, ch, &nestlen, P_ALLOWESC|rflags);
|
|
else
|
|
nestret = parse_matched_pair (ch, ch, ch, &nestlen, rflags);
|
|
pop_delimiter (dstack);
|
|
CHECK_NESTRET_ERROR ();
|
|
|
|
if MBTEST((tflags & LEX_WASDOL) && ch == '\'' && (extended_quote || (rflags & P_DQUOTE) == 0))
|
|
{
|
|
/* Translate $'...' here. */
|
|
ttrans = ansiexpand (nestret, 0, nestlen - 1, &ttranslen);
|
|
xfree (nestret);
|
|
|
|
/* If we're parsing a double-quoted brace expansion and we are
|
|
not in a place where single quotes are treated specially,
|
|
make sure we single-quote the results of the ansi
|
|
expansion because quote removal should remove them later */
|
|
/* FLAG POSIX INTERP 221 */
|
|
if ((shell_compatibility_level > 42) && (rflags & P_DQUOTE) && (dolbrace_state == DOLBRACE_QUOTE2) && (flags & P_DOLBRACE))
|
|
{
|
|
nestret = sh_single_quote (ttrans);
|
|
free (ttrans);
|
|
nestlen = strlen (nestret);
|
|
}
|
|
else if ((rflags & P_DQUOTE) == 0)
|
|
{
|
|
nestret = sh_single_quote (ttrans);
|
|
free (ttrans);
|
|
nestlen = strlen (nestret);
|
|
}
|
|
else
|
|
{
|
|
nestret = ttrans;
|
|
nestlen = ttranslen;
|
|
}
|
|
retind -= 2; /* back up before the $' */
|
|
}
|
|
else if MBTEST((tflags & LEX_WASDOL) && ch == '"' && (extended_quote || (rflags & P_DQUOTE) == 0))
|
|
{
|
|
/* Locale expand $"..." here. */
|
|
ttrans = localeexpand (nestret, 0, nestlen - 1, start_lineno, &ttranslen);
|
|
xfree (nestret);
|
|
|
|
nestret = sh_mkdoublequoted (ttrans, ttranslen, 0);
|
|
free (ttrans);
|
|
nestlen = ttranslen + 2;
|
|
retind -= 2; /* back up before the $" */
|
|
}
|
|
|
|
APPEND_NESTRET ();
|
|
FREE (nestret);
|
|
}
|
|
else if ((flags & (P_ARRAYSUB|P_DOLBRACE)) && (tflags & LEX_WASDOL) && (ch == '(' || ch == '{' || ch == '[')) /* ) } ] */
|
|
goto parse_dollar_word;
|
|
}
|
|
/* Parse an old-style command substitution within double quotes as a
|
|
single word. */
|
|
/* XXX - sh and ksh93 don't do this - XXX */
|
|
else if MBTEST(open == '"' && ch == '`')
|
|
{
|
|
nestret = parse_matched_pair (0, '`', '`', &nestlen, rflags);
|
|
|
|
CHECK_NESTRET_ERROR ();
|
|
APPEND_NESTRET ();
|
|
|
|
FREE (nestret);
|
|
}
|
|
else if MBTEST(open != '`' && (tflags & LEX_WASDOL) && (ch == '(' || ch == '{' || ch == '[')) /* ) } ] */
|
|
/* check for $(), $[], or ${} inside quoted string. */
|
|
{
|
|
parse_dollar_word:
|
|
if (open == ch) /* undo previous increment */
|
|
count--;
|
|
if (ch == '(') /* ) */
|
|
nestret = parse_comsub (0, '(', ')', &nestlen, (rflags|P_COMMAND) & ~P_DQUOTE);
|
|
else if (ch == '{') /* } */
|
|
nestret = parse_matched_pair (0, '{', '}', &nestlen, P_FIRSTCLOSE|P_DOLBRACE|rflags);
|
|
else if (ch == '[') /* ] */
|
|
nestret = parse_matched_pair (0, '[', ']', &nestlen, rflags);
|
|
|
|
CHECK_NESTRET_ERROR ();
|
|
APPEND_NESTRET ();
|
|
|
|
FREE (nestret);
|
|
}
|
|
if MBTEST(ch == '$')
|
|
tflags |= LEX_WASDOL;
|
|
else
|
|
tflags &= ~LEX_WASDOL;
|
|
}
|
|
|
|
ret[retind] = '\0';
|
|
if (lenp)
|
|
*lenp = retind;
|
|
/*itrace("parse_matched_pair[%d]: returning %s", line_number, ret);*/
|
|
return ret;
|
|
}
|
|
|
|
#if defined (DEBUG)
|
|
static void
|
|
dump_tflags (flags)
|
|
int flags;
|
|
{
|
|
int f;
|
|
|
|
f = flags;
|
|
fprintf (stderr, "%d -> ", f);
|
|
if (f & LEX_WASDOL)
|
|
{
|
|
f &= ~LEX_WASDOL;
|
|
fprintf (stderr, "LEX_WASDOL%s", f ? "|" : "");
|
|
}
|
|
if (f & LEX_CKCOMMENT)
|
|
{
|
|
f &= ~LEX_CKCOMMENT;
|
|
fprintf (stderr, "LEX_CKCOMMENT%s", f ? "|" : "");
|
|
}
|
|
if (f & LEX_INCOMMENT)
|
|
{
|
|
f &= ~LEX_INCOMMENT;
|
|
fprintf (stderr, "LEX_INCOMMENT%s", f ? "|" : "");
|
|
}
|
|
if (f & LEX_PASSNEXT)
|
|
{
|
|
f &= ~LEX_PASSNEXT;
|
|
fprintf (stderr, "LEX_PASSNEXT%s", f ? "|" : "");
|
|
}
|
|
if (f & LEX_RESWDOK)
|
|
{
|
|
f &= ~LEX_RESWDOK;
|
|
fprintf (stderr, "LEX_RESWDOK%s", f ? "|" : "");
|
|
}
|
|
if (f & LEX_CKCASE)
|
|
{
|
|
f &= ~LEX_CKCASE;
|
|
fprintf (stderr, "LEX_CKCASE%s", f ? "|" : "");
|
|
}
|
|
if (f & LEX_INCASE)
|
|
{
|
|
f &= ~LEX_INCASE;
|
|
fprintf (stderr, "LEX_INCASE%s", f ? "|" : "");
|
|
}
|
|
if (f & LEX_INHEREDOC)
|
|
{
|
|
f &= ~LEX_INHEREDOC;
|
|
fprintf (stderr, "LEX_INHEREDOC%s", f ? "|" : "");
|
|
}
|
|
if (f & LEX_HEREDELIM)
|
|
{
|
|
f &= ~LEX_HEREDELIM;
|
|
fprintf (stderr, "LEX_HEREDELIM%s", f ? "|" : "");
|
|
}
|
|
if (f & LEX_STRIPDOC)
|
|
{
|
|
f &= ~LEX_STRIPDOC;
|
|
fprintf (stderr, "LEX_WASDOL%s", f ? "|" : "");
|
|
}
|
|
if (f & LEX_QUOTEDDOC)
|
|
{
|
|
f &= ~LEX_QUOTEDDOC;
|
|
fprintf (stderr, "LEX_QUOTEDDOC%s", f ? "|" : "");
|
|
}
|
|
if (f & LEX_INWORD)
|
|
{
|
|
f &= ~LEX_INWORD;
|
|
fprintf (stderr, "LEX_INWORD%s", f ? "|" : "");
|
|
}
|
|
|
|
fprintf (stderr, "\n");
|
|
fflush (stderr);
|
|
}
|
|
#endif
|
|
|
|
/* Parse a $(...) command substitution. This is messier than I'd like, and
|
|
reproduces a lot more of the token-reading code than I'd like. */
|
|
static char *
|
|
parse_comsub (qc, open, close, lenp, flags)
|
|
int qc; /* `"' if this construct is within double quotes */
|
|
int open, close;
|
|
int *lenp, flags;
|
|
{
|
|
int count, ch, peekc, tflags, lex_rwlen, lex_wlen, lex_firstind;
|
|
int nestlen, ttranslen, start_lineno;
|
|
char *ret, *nestret, *ttrans, *heredelim;
|
|
int retind, retsize, rflags, hdlen;
|
|
|
|
/* Posix interp 217 says arithmetic expressions have precedence, so
|
|
assume $(( introduces arithmetic expansion and parse accordingly. */
|
|
peekc = shell_getc (0);
|
|
shell_ungetc (peekc);
|
|
if (peekc == '(')
|
|
return (parse_matched_pair (qc, open, close, lenp, 0));
|
|
|
|
/*itrace("parse_comsub: qc = `%c' open = %c close = %c", qc, open, close);*/
|
|
count = 1;
|
|
tflags = LEX_RESWDOK;
|
|
|
|
if ((flags & P_COMMAND) && qc != '\'' && qc != '"' && (flags & P_DQUOTE) == 0)
|
|
tflags |= LEX_CKCASE;
|
|
if ((tflags & LEX_CKCASE) && (interactive == 0 || interactive_comments))
|
|
tflags |= LEX_CKCOMMENT;
|
|
|
|
/* RFLAGS is the set of flags we want to pass to recursive calls. */
|
|
rflags = (flags & P_DQUOTE);
|
|
|
|
ret = (char *)xmalloc (retsize = 64);
|
|
retind = 0;
|
|
|
|
start_lineno = line_number;
|
|
lex_rwlen = lex_wlen = 0;
|
|
|
|
heredelim = 0;
|
|
lex_firstind = -1;
|
|
|
|
while (count)
|
|
{
|
|
comsub_readchar:
|
|
ch = shell_getc (qc != '\'' && (tflags & (LEX_INCOMMENT|LEX_PASSNEXT)) == 0);
|
|
|
|
if (ch == EOF)
|
|
{
|
|
eof_error:
|
|
free (ret);
|
|
FREE (heredelim);
|
|
parser_error (start_lineno, _("unexpected EOF while looking for matching `%c'"), close);
|
|
EOF_Reached = 1; /* XXX */
|
|
return (&matched_pair_error);
|
|
}
|
|
|
|
/* If we hit the end of a line and are reading the contents of a here
|
|
document, and it's not the same line that the document starts on,
|
|
check for this line being the here doc delimiter. Otherwise, if
|
|
we're in a here document, mark the next character as the beginning
|
|
of a line. */
|
|
if (ch == '\n')
|
|
{
|
|
if ((tflags & LEX_HEREDELIM) && heredelim)
|
|
{
|
|
tflags &= ~LEX_HEREDELIM;
|
|
tflags |= LEX_INHEREDOC;
|
|
lex_firstind = retind + 1;
|
|
}
|
|
else if (tflags & LEX_INHEREDOC)
|
|
{
|
|
int tind;
|
|
tind = lex_firstind;
|
|
while ((tflags & LEX_STRIPDOC) && ret[tind] == '\t')
|
|
tind++;
|
|
if (STREQN (ret + tind, heredelim, hdlen))
|
|
{
|
|
tflags &= ~(LEX_STRIPDOC|LEX_INHEREDOC|LEX_QUOTEDDOC);
|
|
/*itrace("parse_comsub:%d: found here doc end `%s'", line_number, ret + tind);*/
|
|
free (heredelim);
|
|
heredelim = 0;
|
|
lex_firstind = -1;
|
|
}
|
|
else
|
|
lex_firstind = retind + 1;
|
|
}
|
|
}
|
|
|
|
/* Possible reprompting. */
|
|
if (ch == '\n' && SHOULD_PROMPT ())
|
|
prompt_again ();
|
|
|
|
/* XXX -- possibly allow here doc to be delimited by ending right
|
|
paren. */
|
|
if ((tflags & LEX_INHEREDOC) && ch == close && count == 1)
|
|
{
|
|
int tind;
|
|
/*itrace("parse_comsub:%d: in here doc, ch == close, retind - firstind = %d hdlen = %d retind = %d", line_number, retind-lex_firstind, hdlen, retind);*/
|
|
tind = lex_firstind;
|
|
while ((tflags & LEX_STRIPDOC) && ret[tind] == '\t')
|
|
tind++;
|
|
if (retind-tind == hdlen && STREQN (ret + tind, heredelim, hdlen))
|
|
{
|
|
tflags &= ~(LEX_STRIPDOC|LEX_INHEREDOC|LEX_QUOTEDDOC);
|
|
/*itrace("parse_comsub:%d: found here doc end `%*s'", line_number, hdlen, ret + tind);*/
|
|
free (heredelim);
|
|
heredelim = 0;
|
|
lex_firstind = -1;
|
|
}
|
|
}
|
|
|
|
/* Don't bother counting parens or doing anything else if in a comment or
|
|
here document (not exactly right for here-docs -- if we want to allow
|
|
recursive calls to parse_comsub to have their own here documents,
|
|
change the LEX_INHEREDOC to LEX_QUOTEDDOC here and uncomment the next
|
|
clause below. Note that to make this work completely, we need to make
|
|
additional changes to allow xparse_dolparen to work right when the
|
|
command substitution is parsed, because read_secondary_line doesn't know
|
|
to recursively parse through command substitutions embedded in here-
|
|
documents */
|
|
if (tflags & (LEX_INCOMMENT|LEX_INHEREDOC))
|
|
{
|
|
/* Add this character. */
|
|
RESIZE_MALLOCED_BUFFER (ret, retind, 1, retsize, 64);
|
|
ret[retind++] = ch;
|
|
|
|
if ((tflags & LEX_INCOMMENT) && ch == '\n')
|
|
{
|
|
/*itrace("parse_comsub:%d: lex_incomment -> 0 ch = `%c'", line_number, ch);*/
|
|
tflags &= ~LEX_INCOMMENT;
|
|
}
|
|
|
|
continue;
|
|
}
|
|
#if 0
|
|
/* If we're going to recursively parse a command substitution inside a
|
|
here-document, make sure we call parse_comsub recursively below. See
|
|
above for additional caveats. */
|
|
if ((tflags & LEX_INHEREDOC) && ((tflags & LEX_WASDOL) == 0 || ch != '(')) /*)*/
|
|
{
|
|
/* Add this character. */
|
|
RESIZE_MALLOCED_BUFFER (ret, retind, 1, retsize, 64);
|
|
ret[retind++] = ch;
|
|
if MBTEST(ch == '$')
|
|
tflags |= LEX_WASDOL;
|
|
else
|
|
tflags &= ~LEX_WASDOL;
|
|
}
|
|
#endif
|
|
|
|
if (tflags & LEX_PASSNEXT) /* last char was backslash */
|
|
{
|
|
/*itrace("parse_comsub:%d: lex_passnext -> 0 ch = `%c' (%d)", line_number, ch, __LINE__);*/
|
|
tflags &= ~LEX_PASSNEXT;
|
|
if (qc != '\'' && ch == '\n') /* double-quoted \<newline> disappears. */
|
|
{
|
|
if (retind > 0)
|
|
retind--; /* swallow previously-added backslash */
|
|
continue;
|
|
}
|
|
|
|
RESIZE_MALLOCED_BUFFER (ret, retind, 2, retsize, 64);
|
|
if MBTEST(ch == CTLESC)
|
|
ret[retind++] = CTLESC;
|
|
ret[retind++] = ch;
|
|
continue;
|
|
}
|
|
|
|
/* If this is a shell break character, we are not in a word. If not,
|
|
we either start or continue a word. */
|
|
if MBTEST(shellbreak (ch))
|
|
{
|
|
tflags &= ~LEX_INWORD;
|
|
/*itrace("parse_comsub:%d: lex_inword -> 0 ch = `%c' (%d)", line_number, ch, __LINE__);*/
|
|
}
|
|
else
|
|
{
|
|
if (tflags & LEX_INWORD)
|
|
{
|
|
lex_wlen++;
|
|
/*itrace("parse_comsub:%d: lex_inword == 1 ch = `%c' lex_wlen = %d (%d)", line_number, ch, lex_wlen, __LINE__);*/
|
|
}
|
|
else
|
|
{
|
|
/*itrace("parse_comsub:%d: lex_inword -> 1 ch = `%c' (%d)", line_number, ch, __LINE__);*/
|
|
tflags |= LEX_INWORD;
|
|
lex_wlen = 0;
|
|
if (tflags & LEX_RESWDOK)
|
|
lex_rwlen = 0;
|
|
}
|
|
}
|
|
|
|
/* Skip whitespace */
|
|
if MBTEST(shellblank (ch) && (tflags & LEX_HEREDELIM) == 0 && lex_rwlen == 0)
|
|
{
|
|
/* Add this character. */
|
|
RESIZE_MALLOCED_BUFFER (ret, retind, 1, retsize, 64);
|
|
ret[retind++] = ch;
|
|
continue;
|
|
}
|
|
|
|
/* Either we are looking for the start of the here-doc delimiter
|
|
(lex_firstind == -1) or we are reading one (lex_firstind >= 0).
|
|
If this character is a shell break character and we are reading
|
|
the delimiter, save it and note that we are now reading a here
|
|
document. If we've found the start of the delimiter, note it by
|
|
setting lex_firstind. Backslashes can quote shell metacharacters
|
|
in here-doc delimiters. */
|
|
if (tflags & LEX_HEREDELIM)
|
|
{
|
|
if (lex_firstind == -1 && shellbreak (ch) == 0)
|
|
lex_firstind = retind;
|
|
#if 0
|
|
else if (heredelim && (tflags & LEX_PASSNEXT) == 0 && ch == '\n')
|
|
{
|
|
tflags |= LEX_INHEREDOC;
|
|
tflags &= ~LEX_HEREDELIM;
|
|
lex_firstind = retind + 1;
|
|
}
|
|
#endif
|
|
else if (lex_firstind >= 0 && (tflags & LEX_PASSNEXT) == 0 && shellbreak (ch))
|
|
{
|
|
if (heredelim == 0)
|
|
{
|
|
nestret = substring (ret, lex_firstind, retind);
|
|
heredelim = string_quote_removal (nestret, 0);
|
|
hdlen = STRLEN(heredelim);
|
|
/*itrace("parse_comsub:%d: found here doc delimiter `%s' (%d)", line_number, heredelim, hdlen);*/
|
|
if (STREQ (heredelim, nestret) == 0)
|
|
tflags |= LEX_QUOTEDDOC;
|
|
free (nestret);
|
|
}
|
|
if (ch == '\n')
|
|
{
|
|
tflags |= LEX_INHEREDOC;
|
|
tflags &= ~LEX_HEREDELIM;
|
|
lex_firstind = retind + 1;
|
|
}
|
|
else
|
|
lex_firstind = -1;
|
|
}
|
|
}
|
|
|
|
/* Meta-characters that can introduce a reserved word. Not perfect yet. */
|
|
if MBTEST((tflags & LEX_RESWDOK) == 0 && (tflags & LEX_CKCASE) && (tflags & LEX_INCOMMENT) == 0 && (shellmeta(ch) || ch == '\n'))
|
|
{
|
|
/* Add this character. */
|
|
RESIZE_MALLOCED_BUFFER (ret, retind, 1, retsize, 64);
|
|
ret[retind++] = ch;
|
|
peekc = shell_getc (1);
|
|
if (ch == peekc && (ch == '&' || ch == '|' || ch == ';')) /* two-character tokens */
|
|
{
|
|
RESIZE_MALLOCED_BUFFER (ret, retind, 1, retsize, 64);
|
|
ret[retind++] = peekc;
|
|
/*itrace("parse_comsub:%d: set lex_reswordok = 1, ch = `%c'", line_number, ch);*/
|
|
tflags |= LEX_RESWDOK;
|
|
lex_rwlen = 0;
|
|
continue;
|
|
}
|
|
else if (ch == '\n' || COMSUB_META(ch))
|
|
{
|
|
shell_ungetc (peekc);
|
|
/*itrace("parse_comsub:%d: set lex_reswordok = 1, ch = `%c'", line_number, ch);*/
|
|
tflags |= LEX_RESWDOK;
|
|
lex_rwlen = 0;
|
|
continue;
|
|
}
|
|
else if (ch == EOF)
|
|
goto eof_error;
|
|
else
|
|
{
|
|
/* `unget' the character we just added and fall through */
|
|
retind--;
|
|
shell_ungetc (peekc);
|
|
}
|
|
}
|
|
|
|
/* If we can read a reserved word, try to read one. */
|
|
if (tflags & LEX_RESWDOK)
|
|
{
|
|
if MBTEST(islower ((unsigned char)ch))
|
|
{
|
|
/* Add this character. */
|
|
RESIZE_MALLOCED_BUFFER (ret, retind, 1, retsize, 64);
|
|
ret[retind++] = ch;
|
|
lex_rwlen++;
|
|
continue;
|
|
}
|
|
else if MBTEST(lex_rwlen == 4 && shellbreak (ch))
|
|
{
|
|
if (STREQN (ret + retind - 4, "case", 4))
|
|
{
|
|
tflags |= LEX_INCASE;
|
|
tflags &= ~LEX_RESWDOK;
|
|
/*itrace("parse_comsub:%d: found `case', lex_incase -> 1 lex_reswdok -> 0", line_number);*/
|
|
}
|
|
else if (STREQN (ret + retind - 4, "esac", 4))
|
|
{
|
|
tflags &= ~LEX_INCASE;
|
|
/*itrace("parse_comsub:%d: found `esac', lex_incase -> 0 lex_reswdok -> 1", line_number);*/
|
|
tflags |= LEX_RESWDOK;
|
|
lex_rwlen = 0;
|
|
}
|
|
else if (STREQN (ret + retind - 4, "done", 4) ||
|
|
STREQN (ret + retind - 4, "then", 4) ||
|
|
STREQN (ret + retind - 4, "else", 4) ||
|
|
STREQN (ret + retind - 4, "elif", 4) ||
|
|
STREQN (ret + retind - 4, "time", 4))
|
|
{
|
|
/* these are four-character reserved words that can be
|
|
followed by a reserved word; anything else turns off
|
|
the reserved-word-ok flag */
|
|
/*itrace("parse_comsub:%d: found `%.4s', lex_reswdok -> 1", line_number, ret+retind-4);*/
|
|
tflags |= LEX_RESWDOK;
|
|
lex_rwlen = 0;
|
|
}
|
|
else
|
|
{
|
|
tflags &= ~LEX_RESWDOK;
|
|
/*itrace("parse_comsub:%d: found `%.4s', lex_reswdok -> 0", line_number, ret+retind-4);*/
|
|
}
|
|
}
|
|
else if MBTEST((tflags & LEX_CKCOMMENT) && ch == '#' && (lex_rwlen == 0 || ((tflags & LEX_INWORD) && lex_wlen == 0)))
|
|
; /* don't modify LEX_RESWDOK if we're starting a comment */
|
|
/* Allow `do' followed by space, tab, or newline to preserve the
|
|
RESWDOK flag, but reset the reserved word length counter so we
|
|
can read another one. */
|
|
else if MBTEST(((tflags & LEX_INCASE) == 0) &&
|
|
(isblank((unsigned char)ch) || ch == '\n') &&
|
|
lex_rwlen == 2 &&
|
|
STREQN (ret + retind - 2, "do", 2))
|
|
{
|
|
/*itrace("parse_comsub:%d: lex_incase == 0 found `%c', found \"do\"", line_number, ch);*/
|
|
lex_rwlen = 0;
|
|
}
|
|
else if MBTEST((tflags & LEX_INCASE) && ch != '\n')
|
|
/* If we can read a reserved word and we're in case, we're at the
|
|
point where we can read a new pattern list or an esac. We
|
|
handle the esac case above. If we read a newline, we want to
|
|
leave LEX_RESWDOK alone. If we read anything else, we want to
|
|
turn off LEX_RESWDOK, since we're going to read a pattern list. */
|
|
{
|
|
tflags &= ~LEX_RESWDOK;
|
|
/*itrace("parse_comsub:%d: lex_incase == 1 found `%c', lex_reswordok -> 0", line_number, ch);*/
|
|
}
|
|
else if MBTEST(shellbreak (ch) == 0)
|
|
{
|
|
tflags &= ~LEX_RESWDOK;
|
|
/*itrace("parse_comsub:%d: found `%c', lex_reswordok -> 0", line_number, ch);*/
|
|
}
|
|
#if 0
|
|
/* If we find a space or tab but have read something and it's not
|
|
`do', turn off the reserved-word-ok flag */
|
|
else if MBTEST(isblank ((unsigned char)ch) && lex_rwlen > 0)
|
|
{
|
|
tflags &= ~LEX_RESWDOK;
|
|
/*itrace("parse_comsub:%d: found `%c', lex_reswordok -> 0", line_number, ch);*/
|
|
}
|
|
#endif
|
|
}
|
|
|
|
/* Might be the start of a here-doc delimiter */
|
|
if MBTEST((tflags & LEX_INCOMMENT) == 0 && (tflags & LEX_CKCASE) && ch == '<')
|
|
{
|
|
/* Add this character. */
|
|
RESIZE_MALLOCED_BUFFER (ret, retind, 1, retsize, 64);
|
|
ret[retind++] = ch;
|
|
peekc = shell_getc (1);
|
|
if (peekc == EOF)
|
|
goto eof_error;
|
|
if (peekc == ch)
|
|
{
|
|
RESIZE_MALLOCED_BUFFER (ret, retind, 1, retsize, 64);
|
|
ret[retind++] = peekc;
|
|
peekc = shell_getc (1);
|
|
if (peekc == EOF)
|
|
goto eof_error;
|
|
if (peekc == '-')
|
|
{
|
|
RESIZE_MALLOCED_BUFFER (ret, retind, 1, retsize, 64);
|
|
ret[retind++] = peekc;
|
|
tflags |= LEX_STRIPDOC;
|
|
}
|
|
else
|
|
shell_ungetc (peekc);
|
|
if (peekc != '<')
|
|
{
|
|
tflags |= LEX_HEREDELIM;
|
|
lex_firstind = -1;
|
|
}
|
|
continue;
|
|
}
|
|
else
|
|
ch = peekc; /* fall through and continue XXX */
|
|
}
|
|
else if MBTEST((tflags & LEX_CKCOMMENT) && (tflags & LEX_INCOMMENT) == 0 && ch == '#' && (((tflags & LEX_RESWDOK) && lex_rwlen == 0) || ((tflags & LEX_INWORD) && lex_wlen == 0)))
|
|
{
|
|
/*itrace("parse_comsub:%d: lex_incomment -> 1 (%d)", line_number, __LINE__);*/
|
|
tflags |= LEX_INCOMMENT;
|
|
}
|
|
|
|
if MBTEST(ch == CTLESC || ch == CTLNUL) /* special shell escapes */
|
|
{
|
|
RESIZE_MALLOCED_BUFFER (ret, retind, 2, retsize, 64);
|
|
ret[retind++] = CTLESC;
|
|
ret[retind++] = ch;
|
|
continue;
|
|
}
|
|
#if 0
|
|
else if MBTEST((tflags & LEX_INCASE) && ch == close && close == ')')
|
|
tflags &= ~LEX_INCASE; /* XXX */
|
|
#endif
|
|
else if MBTEST(ch == close && (tflags & LEX_INCASE) == 0) /* ending delimiter */
|
|
{
|
|
count--;
|
|
/*itrace("parse_comsub:%d: found close: count = %d", line_number, count);*/
|
|
}
|
|
else if MBTEST(((flags & P_FIRSTCLOSE) == 0) && (tflags & LEX_INCASE) == 0 && ch == open) /* nested begin */
|
|
{
|
|
count++;
|
|
/*itrace("parse_comsub:%d: found open: count = %d", line_number, count);*/
|
|
}
|
|
|
|
/* Add this character. */
|
|
RESIZE_MALLOCED_BUFFER (ret, retind, 1, retsize, 64);
|
|
ret[retind++] = ch;
|
|
|
|
/* If we just read the ending character, don't bother continuing. */
|
|
if (count == 0)
|
|
break;
|
|
|
|
if MBTEST(ch == '\\') /* backslashes */
|
|
tflags |= LEX_PASSNEXT;
|
|
|
|
if MBTEST(shellquote (ch))
|
|
{
|
|
/* '', ``, or "" inside $(...). */
|
|
push_delimiter (dstack, ch);
|
|
if MBTEST((tflags & LEX_WASDOL) && ch == '\'') /* $'...' inside group */
|
|
nestret = parse_matched_pair (ch, ch, ch, &nestlen, P_ALLOWESC|rflags);
|
|
else
|
|
nestret = parse_matched_pair (ch, ch, ch, &nestlen, rflags);
|
|
pop_delimiter (dstack);
|
|
CHECK_NESTRET_ERROR ();
|
|
|
|
if MBTEST((tflags & LEX_WASDOL) && ch == '\'' && (extended_quote || (rflags & P_DQUOTE) == 0))
|
|
{
|
|
/* Translate $'...' here. */
|
|
ttrans = ansiexpand (nestret, 0, nestlen - 1, &ttranslen);
|
|
xfree (nestret);
|
|
|
|
if ((rflags & P_DQUOTE) == 0)
|
|
{
|
|
nestret = sh_single_quote (ttrans);
|
|
free (ttrans);
|
|
nestlen = strlen (nestret);
|
|
}
|
|
else
|
|
{
|
|
nestret = ttrans;
|
|
nestlen = ttranslen;
|
|
}
|
|
retind -= 2; /* back up before the $' */
|
|
}
|
|
else if MBTEST((tflags & LEX_WASDOL) && ch == '"' && (extended_quote || (rflags & P_DQUOTE) == 0))
|
|
{
|
|
/* Locale expand $"..." here. */
|
|
ttrans = localeexpand (nestret, 0, nestlen - 1, start_lineno, &ttranslen);
|
|
xfree (nestret);
|
|
|
|
nestret = sh_mkdoublequoted (ttrans, ttranslen, 0);
|
|
free (ttrans);
|
|
nestlen = ttranslen + 2;
|
|
retind -= 2; /* back up before the $" */
|
|
}
|
|
|
|
APPEND_NESTRET ();
|
|
FREE (nestret);
|
|
}
|
|
else if MBTEST((tflags & LEX_WASDOL) && (ch == '(' || ch == '{' || ch == '[')) /* ) } ] */
|
|
/* check for $(), $[], or ${} inside command substitution. */
|
|
{
|
|
if ((tflags & LEX_INCASE) == 0 && open == ch) /* undo previous increment */
|
|
count--;
|
|
if (ch == '(') /* ) */
|
|
nestret = parse_comsub (0, '(', ')', &nestlen, (rflags|P_COMMAND) & ~P_DQUOTE);
|
|
else if (ch == '{') /* } */
|
|
nestret = parse_matched_pair (0, '{', '}', &nestlen, P_FIRSTCLOSE|P_DOLBRACE|rflags);
|
|
else if (ch == '[') /* ] */
|
|
nestret = parse_matched_pair (0, '[', ']', &nestlen, rflags);
|
|
|
|
CHECK_NESTRET_ERROR ();
|
|
APPEND_NESTRET ();
|
|
|
|
FREE (nestret);
|
|
}
|
|
if MBTEST(ch == '$')
|
|
tflags |= LEX_WASDOL;
|
|
else
|
|
tflags &= ~LEX_WASDOL;
|
|
}
|
|
|
|
FREE (heredelim);
|
|
ret[retind] = '\0';
|
|
if (lenp)
|
|
*lenp = retind;
|
|
/*itrace("parse_comsub:%d: returning `%s'", line_number, ret);*/
|
|
return ret;
|
|
}
|
|
|
|
/* Recursively call the parser to parse a $(...) command substitution. */
|
|
char *
|
|
xparse_dolparen (base, string, indp, flags)
|
|
char *base;
|
|
char *string;
|
|
int *indp;
|
|
int flags;
|
|
{
|
|
sh_parser_state_t ps;
|
|
sh_input_line_state_t ls;
|
|
int orig_ind, nc, sflags, orig_eof_token;
|
|
char *ret, *s, *ep, *ostring;
|
|
|
|
/*yydebug = 1;*/
|
|
orig_ind = *indp;
|
|
ostring = string;
|
|
|
|
/*itrace("xparse_dolparen: size = %d shell_input_line = `%s'", shell_input_line_size, shell_input_line);*/
|
|
sflags = SEVAL_NONINT|SEVAL_NOHIST|SEVAL_NOFREE;
|
|
if (flags & SX_NOLONGJMP)
|
|
sflags |= SEVAL_NOLONGJMP;
|
|
save_parser_state (&ps);
|
|
save_input_line_state (&ls);
|
|
orig_eof_token = shell_eof_token;
|
|
|
|
/*(*/
|
|
parser_state |= PST_CMDSUBST|PST_EOFTOKEN; /* allow instant ')' */ /*(*/
|
|
shell_eof_token = ')';
|
|
|
|
nc = parse_string (string, "command substitution", sflags, &ep);
|
|
|
|
shell_eof_token = orig_eof_token;
|
|
restore_parser_state (&ps);
|
|
reset_parser ();
|
|
/* reset_parser clears shell_input_line and associated variables */
|
|
restore_input_line_state (&ls);
|
|
|
|
token_to_read = 0;
|
|
|
|
/* If parse_string returns < 0, we need to jump to top level with the
|
|
negative of the return value */
|
|
if (nc < 0)
|
|
jump_to_top_level (-nc); /* XXX */
|
|
|
|
/* Need to find how many characters parse_and_execute consumed, update
|
|
*indp, if flags != 0, copy the portion of the string parsed into RET
|
|
and return it. If flags & 1 (EX_NOALLOC) we can return NULL. */
|
|
|
|
/*(*/
|
|
if (ep[-1] != ')')
|
|
{
|
|
#if DEBUG
|
|
if (ep[-1] != '\n')
|
|
itrace("xparse_dolparen:%d: ep[-1] != RPAREN (%d), ep = `%s'", line_number, ep[-1], ep);
|
|
#endif
|
|
while (ep > ostring && ep[-1] == '\n') ep--;
|
|
}
|
|
|
|
nc = ep - ostring;
|
|
*indp = ep - base - 1;
|
|
|
|
/*(*/
|
|
#if DEBUG
|
|
if (base[*indp] != ')')
|
|
itrace("xparse_dolparen:%d: base[%d] != RPAREN (%d), base = `%s'", line_number, *indp, base[*indp], base);
|
|
#endif
|
|
|
|
if (flags & SX_NOALLOC)
|
|
return (char *)NULL;
|
|
|
|
if (nc == 0)
|
|
{
|
|
ret = xmalloc (1);
|
|
ret[0] = '\0';
|
|
}
|
|
else
|
|
ret = substring (ostring, 0, nc - 1);
|
|
|
|
return ret;
|
|
}
|
|
|
|
#if defined (DPAREN_ARITHMETIC) || defined (ARITH_FOR_COMMAND)
|
|
/* Parse a double-paren construct. It can be either an arithmetic
|
|
command, an arithmetic `for' command, or a nested subshell. Returns
|
|
the parsed token, -1 on error, or -2 if we didn't do anything and
|
|
should just go on. */
|
|
static int
|
|
parse_dparen (c)
|
|
int c;
|
|
{
|
|
int cmdtyp, sline;
|
|
char *wval;
|
|
WORD_DESC *wd;
|
|
|
|
#if defined (ARITH_FOR_COMMAND)
|
|
if (last_read_token == FOR)
|
|
{
|
|
arith_for_lineno = line_number;
|
|
cmdtyp = parse_arith_cmd (&wval, 0);
|
|
if (cmdtyp == 1)
|
|
{
|
|
wd = alloc_word_desc ();
|
|
wd->word = wval;
|
|
yylval.word_list = make_word_list (wd, (WORD_LIST *)NULL);
|
|
return (ARITH_FOR_EXPRS);
|
|
}
|
|
else
|
|
return -1; /* ERROR */
|
|
}
|
|
#endif
|
|
|
|
#if defined (DPAREN_ARITHMETIC)
|
|
if (reserved_word_acceptable (last_read_token))
|
|
{
|
|
sline = line_number;
|
|
|
|
cmdtyp = parse_arith_cmd (&wval, 0);
|
|
if (cmdtyp == 1) /* arithmetic command */
|
|
{
|
|
wd = alloc_word_desc ();
|
|
wd->word = wval;
|
|
wd->flags = W_QUOTED|W_NOSPLIT|W_NOGLOB|W_DQUOTE;
|
|
yylval.word_list = make_word_list (wd, (WORD_LIST *)NULL);
|
|
return (ARITH_CMD);
|
|
}
|
|
else if (cmdtyp == 0) /* nested subshell */
|
|
{
|
|
push_string (wval, 0, (alias_t *)NULL);
|
|
pushed_string_list->flags = PSH_DPAREN;
|
|
if ((parser_state & PST_CASEPAT) == 0)
|
|
parser_state |= PST_SUBSHELL;
|
|
return (c);
|
|
}
|
|
else /* ERROR */
|
|
return -1;
|
|
}
|
|
#endif
|
|
|
|
return -2; /* XXX */
|
|
}
|
|
|
|
/* We've seen a `(('. Look for the matching `))'. If we get it, return 1.
|
|
If not, assume it's a nested subshell for backwards compatibility and
|
|
return 0. In any case, put the characters we've consumed into a locally-
|
|
allocated buffer and make *ep point to that buffer. Return -1 on an
|
|
error, for example EOF. */
|
|
static int
|
|
parse_arith_cmd (ep, adddq)
|
|
char **ep;
|
|
int adddq;
|
|
{
|
|
int exp_lineno, rval, c;
|
|
char *ttok, *tokstr;
|
|
int ttoklen;
|
|
|
|
exp_lineno = line_number;
|
|
ttok = parse_matched_pair (0, '(', ')', &ttoklen, 0);
|
|
rval = 1;
|
|
if (ttok == &matched_pair_error)
|
|
return -1;
|
|
/* Check that the next character is the closing right paren. If
|
|
not, this is a syntax error. ( */
|
|
c = shell_getc (0);
|
|
if MBTEST(c != ')')
|
|
rval = 0;
|
|
|
|
tokstr = (char *)xmalloc (ttoklen + 4);
|
|
|
|
/* if ADDDQ != 0 then (( ... )) -> "..." */
|
|
if (rval == 1 && adddq) /* arith cmd, add double quotes */
|
|
{
|
|
tokstr[0] = '"';
|
|
strncpy (tokstr + 1, ttok, ttoklen - 1);
|
|
tokstr[ttoklen] = '"';
|
|
tokstr[ttoklen+1] = '\0';
|
|
}
|
|
else if (rval == 1) /* arith cmd, don't add double quotes */
|
|
{
|
|
strncpy (tokstr, ttok, ttoklen - 1);
|
|
tokstr[ttoklen-1] = '\0';
|
|
}
|
|
else /* nested subshell */
|
|
{
|
|
tokstr[0] = '(';
|
|
strncpy (tokstr + 1, ttok, ttoklen - 1);
|
|
tokstr[ttoklen] = ')';
|
|
tokstr[ttoklen+1] = c;
|
|
tokstr[ttoklen+2] = '\0';
|
|
}
|
|
|
|
*ep = tokstr;
|
|
FREE (ttok);
|
|
return rval;
|
|
}
|
|
#endif /* DPAREN_ARITHMETIC || ARITH_FOR_COMMAND */
|
|
|
|
#if defined (COND_COMMAND)
|
|
static void
|
|
cond_error ()
|
|
{
|
|
char *etext;
|
|
|
|
if (EOF_Reached && cond_token != COND_ERROR) /* [[ */
|
|
parser_error (cond_lineno, _("unexpected EOF while looking for `]]'"));
|
|
else if (cond_token != COND_ERROR)
|
|
{
|
|
if (etext = error_token_from_token (cond_token))
|
|
{
|
|
parser_error (cond_lineno, _("syntax error in conditional expression: unexpected token `%s'"), etext);
|
|
free (etext);
|
|
}
|
|
else
|
|
parser_error (cond_lineno, _("syntax error in conditional expression"));
|
|
}
|
|
}
|
|
|
|
static COND_COM *
|
|
cond_expr ()
|
|
{
|
|
return (cond_or ());
|
|
}
|
|
|
|
static COND_COM *
|
|
cond_or ()
|
|
{
|
|
COND_COM *l, *r;
|
|
|
|
l = cond_and ();
|
|
if (cond_token == OR_OR)
|
|
{
|
|
r = cond_or ();
|
|
l = make_cond_node (COND_OR, (WORD_DESC *)NULL, l, r);
|
|
}
|
|
return l;
|
|
}
|
|
|
|
static COND_COM *
|
|
cond_and ()
|
|
{
|
|
COND_COM *l, *r;
|
|
|
|
l = cond_term ();
|
|
if (cond_token == AND_AND)
|
|
{
|
|
r = cond_and ();
|
|
l = make_cond_node (COND_AND, (WORD_DESC *)NULL, l, r);
|
|
}
|
|
return l;
|
|
}
|
|
|
|
static int
|
|
cond_skip_newlines ()
|
|
{
|
|
while ((cond_token = read_token (READ)) == '\n')
|
|
{
|
|
if (SHOULD_PROMPT ())
|
|
prompt_again ();
|
|
}
|
|
return (cond_token);
|
|
}
|
|
|
|
#define COND_RETURN_ERROR() \
|
|
do { cond_token = COND_ERROR; return ((COND_COM *)NULL); } while (0)
|
|
|
|
static COND_COM *
|
|
cond_term ()
|
|
{
|
|
WORD_DESC *op;
|
|
COND_COM *term, *tleft, *tright;
|
|
int tok, lineno;
|
|
char *etext;
|
|
|
|
/* Read a token. It can be a left paren, a `!', a unary operator, or a
|
|
word that should be the first argument of a binary operator. Start by
|
|
skipping newlines, since this is a compound command. */
|
|
tok = cond_skip_newlines ();
|
|
lineno = line_number;
|
|
if (tok == COND_END)
|
|
{
|
|
COND_RETURN_ERROR ();
|
|
}
|
|
else if (tok == '(')
|
|
{
|
|
term = cond_expr ();
|
|
if (cond_token != ')')
|
|
{
|
|
if (term)
|
|
dispose_cond_node (term); /* ( */
|
|
if (etext = error_token_from_token (cond_token))
|
|
{
|
|
parser_error (lineno, _("unexpected token `%s', expected `)'"), etext);
|
|
free (etext);
|
|
}
|
|
else
|
|
parser_error (lineno, _("expected `)'"));
|
|
COND_RETURN_ERROR ();
|
|
}
|
|
term = make_cond_node (COND_EXPR, (WORD_DESC *)NULL, term, (COND_COM *)NULL);
|
|
(void)cond_skip_newlines ();
|
|
}
|
|
else if (tok == BANG || (tok == WORD && (yylval.word->word[0] == '!' && yylval.word->word[1] == '\0')))
|
|
{
|
|
if (tok == WORD)
|
|
dispose_word (yylval.word); /* not needed */
|
|
term = cond_term ();
|
|
if (term)
|
|
term->flags |= CMD_INVERT_RETURN;
|
|
}
|
|
else if (tok == WORD && yylval.word->word[0] == '-' && yylval.word->word[2] == 0 && test_unop (yylval.word->word))
|
|
{
|
|
op = yylval.word;
|
|
tok = read_token (READ);
|
|
if (tok == WORD)
|
|
{
|
|
tleft = make_cond_node (COND_TERM, yylval.word, (COND_COM *)NULL, (COND_COM *)NULL);
|
|
term = make_cond_node (COND_UNARY, op, tleft, (COND_COM *)NULL);
|
|
}
|
|
else
|
|
{
|
|
dispose_word (op);
|
|
if (etext = error_token_from_token (tok))
|
|
{
|
|
parser_error (line_number, _("unexpected argument `%s' to conditional unary operator"), etext);
|
|
free (etext);
|
|
}
|
|
else
|
|
parser_error (line_number, _("unexpected argument to conditional unary operator"));
|
|
COND_RETURN_ERROR ();
|
|
}
|
|
|
|
(void)cond_skip_newlines ();
|
|
}
|
|
else if (tok == WORD) /* left argument to binary operator */
|
|
{
|
|
/* lhs */
|
|
tleft = make_cond_node (COND_TERM, yylval.word, (COND_COM *)NULL, (COND_COM *)NULL);
|
|
|
|
/* binop */
|
|
tok = read_token (READ);
|
|
if (tok == WORD && test_binop (yylval.word->word))
|
|
{
|
|
op = yylval.word;
|
|
if (op->word[0] == '=' && (op->word[1] == '\0' || (op->word[1] == '=' && op->word[2] == '\0')))
|
|
parser_state |= PST_EXTPAT;
|
|
else if (op->word[0] == '!' && op->word[1] == '=' && op->word[2] == '\0')
|
|
parser_state |= PST_EXTPAT;
|
|
}
|
|
#if defined (COND_REGEXP)
|
|
else if (tok == WORD && STREQ (yylval.word->word, "=~"))
|
|
{
|
|
op = yylval.word;
|
|
parser_state |= PST_REGEXP;
|
|
}
|
|
#endif
|
|
else if (tok == '<' || tok == '>')
|
|
op = make_word_from_token (tok); /* ( */
|
|
/* There should be a check before blindly accepting the `)' that we have
|
|
seen the opening `('. */
|
|
else if (tok == COND_END || tok == AND_AND || tok == OR_OR || tok == ')')
|
|
{
|
|
/* Special case. [[ x ]] is equivalent to [[ -n x ]], just like
|
|
the test command. Similarly for [[ x && expr ]] or
|
|
[[ x || expr ]] or [[ (x) ]]. */
|
|
op = make_word ("-n");
|
|
term = make_cond_node (COND_UNARY, op, tleft, (COND_COM *)NULL);
|
|
cond_token = tok;
|
|
return (term);
|
|
}
|
|
else
|
|
{
|
|
if (etext = error_token_from_token (tok))
|
|
{
|
|
parser_error (line_number, _("unexpected token `%s', conditional binary operator expected"), etext);
|
|
free (etext);
|
|
}
|
|
else
|
|
parser_error (line_number, _("conditional binary operator expected"));
|
|
dispose_cond_node (tleft);
|
|
COND_RETURN_ERROR ();
|
|
}
|
|
|
|
/* rhs */
|
|
if (parser_state & PST_EXTPAT)
|
|
extended_glob = 1;
|
|
tok = read_token (READ);
|
|
if (parser_state & PST_EXTPAT)
|
|
extended_glob = global_extglob;
|
|
parser_state &= ~(PST_REGEXP|PST_EXTPAT);
|
|
|
|
if (tok == WORD)
|
|
{
|
|
tright = make_cond_node (COND_TERM, yylval.word, (COND_COM *)NULL, (COND_COM *)NULL);
|
|
term = make_cond_node (COND_BINARY, op, tleft, tright);
|
|
}
|
|
else
|
|
{
|
|
if (etext = error_token_from_token (tok))
|
|
{
|
|
parser_error (line_number, _("unexpected argument `%s' to conditional binary operator"), etext);
|
|
free (etext);
|
|
}
|
|
else
|
|
parser_error (line_number, _("unexpected argument to conditional binary operator"));
|
|
dispose_cond_node (tleft);
|
|
dispose_word (op);
|
|
COND_RETURN_ERROR ();
|
|
}
|
|
|
|
(void)cond_skip_newlines ();
|
|
}
|
|
else
|
|
{
|
|
if (tok < 256)
|
|
parser_error (line_number, _("unexpected token `%c' in conditional command"), tok);
|
|
else if (etext = error_token_from_token (tok))
|
|
{
|
|
parser_error (line_number, _("unexpected token `%s' in conditional command"), etext);
|
|
free (etext);
|
|
}
|
|
else
|
|
parser_error (line_number, _("unexpected token %d in conditional command"), tok);
|
|
COND_RETURN_ERROR ();
|
|
}
|
|
return (term);
|
|
}
|
|
|
|
/* This is kind of bogus -- we slip a mini recursive-descent parser in
|
|
here to handle the conditional statement syntax. */
|
|
static COMMAND *
|
|
parse_cond_command ()
|
|
{
|
|
COND_COM *cexp;
|
|
|
|
global_extglob = extended_glob;
|
|
cexp = cond_expr ();
|
|
return (make_cond_command (cexp));
|
|
}
|
|
#endif
|
|
|
|
#if defined (ARRAY_VARS)
|
|
/* When this is called, it's guaranteed that we don't care about anything
|
|
in t beyond i. We do save and restore the chars, though. */
|
|
static int
|
|
token_is_assignment (t, i)
|
|
char *t;
|
|
int i;
|
|
{
|
|
unsigned char c, c1;
|
|
int r;
|
|
|
|
c = t[i]; c1 = t[i+1];
|
|
t[i] = '='; t[i+1] = '\0';
|
|
r = assignment (t, (parser_state & PST_COMPASSIGN) != 0);
|
|
t[i] = c; t[i+1] = c1;
|
|
return r;
|
|
}
|
|
|
|
/* XXX - possible changes here for `+=' */
|
|
static int
|
|
token_is_ident (t, i)
|
|
char *t;
|
|
int i;
|
|
{
|
|
unsigned char c;
|
|
int r;
|
|
|
|
c = t[i];
|
|
t[i] = '\0';
|
|
r = legal_identifier (t);
|
|
t[i] = c;
|
|
return r;
|
|
}
|
|
#endif
|
|
|
|
static int
|
|
read_token_word (character)
|
|
int character;
|
|
{
|
|
/* The value for YYLVAL when a WORD is read. */
|
|
WORD_DESC *the_word;
|
|
|
|
/* Index into the token that we are building. */
|
|
int token_index;
|
|
|
|
/* ALL_DIGITS becomes zero when we see a non-digit. */
|
|
int all_digit_token;
|
|
|
|
/* DOLLAR_PRESENT becomes non-zero if we see a `$'. */
|
|
int dollar_present;
|
|
|
|
/* COMPOUND_ASSIGNMENT becomes non-zero if we are parsing a compound
|
|
assignment. */
|
|
int compound_assignment;
|
|
|
|
/* QUOTED becomes non-zero if we see one of ("), ('), (`), or (\). */
|
|
int quoted;
|
|
|
|
/* Non-zero means to ignore the value of the next character, and just
|
|
to add it no matter what. */
|
|
int pass_next_character;
|
|
|
|
/* The current delimiting character. */
|
|
int cd;
|
|
int result, peek_char;
|
|
char *ttok, *ttrans;
|
|
int ttoklen, ttranslen;
|
|
intmax_t lvalue;
|
|
|
|
if (token_buffer_size < TOKEN_DEFAULT_INITIAL_SIZE)
|
|
token = (char *)xrealloc (token, token_buffer_size = TOKEN_DEFAULT_INITIAL_SIZE);
|
|
|
|
token_index = 0;
|
|
all_digit_token = DIGIT (character);
|
|
dollar_present = quoted = pass_next_character = compound_assignment = 0;
|
|
|
|
for (;;)
|
|
{
|
|
if (character == EOF)
|
|
goto got_token;
|
|
|
|
if (pass_next_character)
|
|
{
|
|
pass_next_character = 0;
|
|
goto got_escaped_character;
|
|
}
|
|
|
|
cd = current_delimiter (dstack);
|
|
|
|
/* Handle backslashes. Quote lots of things when not inside of
|
|
double-quotes, quote some things inside of double-quotes. */
|
|
if MBTEST(character == '\\')
|
|
{
|
|
peek_char = shell_getc (0);
|
|
|
|
/* Backslash-newline is ignored in all cases except
|
|
when quoted with single quotes. */
|
|
if (peek_char == '\n')
|
|
{
|
|
character = '\n';
|
|
goto next_character;
|
|
}
|
|
else
|
|
{
|
|
shell_ungetc (peek_char);
|
|
|
|
/* If the next character is to be quoted, note it now. */
|
|
if (cd == 0 || cd == '`' ||
|
|
(cd == '"' && peek_char >= 0 && (sh_syntaxtab[peek_char] & CBSDQUOTE)))
|
|
pass_next_character++;
|
|
|
|
quoted = 1;
|
|
goto got_character;
|
|
}
|
|
}
|
|
|
|
/* Parse a matched pair of quote characters. */
|
|
if MBTEST(shellquote (character))
|
|
{
|
|
push_delimiter (dstack, character);
|
|
ttok = parse_matched_pair (character, character, character, &ttoklen, (character == '`') ? P_COMMAND : 0);
|
|
pop_delimiter (dstack);
|
|
if (ttok == &matched_pair_error)
|
|
return -1; /* Bail immediately. */
|
|
RESIZE_MALLOCED_BUFFER (token, token_index, ttoklen + 2,
|
|
token_buffer_size, TOKEN_DEFAULT_GROW_SIZE);
|
|
token[token_index++] = character;
|
|
strcpy (token + token_index, ttok);
|
|
token_index += ttoklen;
|
|
all_digit_token = 0;
|
|
quoted = 1;
|
|
dollar_present |= (character == '"' && strchr (ttok, '$') != 0);
|
|
FREE (ttok);
|
|
goto next_character;
|
|
}
|
|
|
|
#ifdef COND_REGEXP
|
|
/* When parsing a regexp as a single word inside a conditional command,
|
|
we need to special-case characters special to both the shell and
|
|
regular expressions. Right now, that is only '(' and '|'. */ /*)*/
|
|
if MBTEST((parser_state & PST_REGEXP) && (character == '(' || character == '|')) /*)*/
|
|
{
|
|
if (character == '|')
|
|
goto got_character;
|
|
|
|
push_delimiter (dstack, character);
|
|
ttok = parse_matched_pair (cd, '(', ')', &ttoklen, 0);
|
|
pop_delimiter (dstack);
|
|
if (ttok == &matched_pair_error)
|
|
return -1; /* Bail immediately. */
|
|
RESIZE_MALLOCED_BUFFER (token, token_index, ttoklen + 2,
|
|
token_buffer_size, TOKEN_DEFAULT_GROW_SIZE);
|
|
token[token_index++] = character;
|
|
strcpy (token + token_index, ttok);
|
|
token_index += ttoklen;
|
|
FREE (ttok);
|
|
dollar_present = all_digit_token = 0;
|
|
goto next_character;
|
|
}
|
|
#endif /* COND_REGEXP */
|
|
|
|
#ifdef EXTENDED_GLOB
|
|
/* Parse a ksh-style extended pattern matching specification. */
|
|
if MBTEST(extended_glob && PATTERN_CHAR (character))
|
|
{
|
|
peek_char = shell_getc (1);
|
|
if MBTEST(peek_char == '(') /* ) */
|
|
{
|
|
push_delimiter (dstack, peek_char);
|
|
ttok = parse_matched_pair (cd, '(', ')', &ttoklen, 0);
|
|
pop_delimiter (dstack);
|
|
if (ttok == &matched_pair_error)
|
|
return -1; /* Bail immediately. */
|
|
RESIZE_MALLOCED_BUFFER (token, token_index, ttoklen + 3,
|
|
token_buffer_size,
|
|
TOKEN_DEFAULT_GROW_SIZE);
|
|
token[token_index++] = character;
|
|
token[token_index++] = peek_char;
|
|
strcpy (token + token_index, ttok);
|
|
token_index += ttoklen;
|
|
FREE (ttok);
|
|
dollar_present = all_digit_token = 0;
|
|
goto next_character;
|
|
}
|
|
else
|
|
shell_ungetc (peek_char);
|
|
}
|
|
#endif /* EXTENDED_GLOB */
|
|
|
|
/* If the delimiter character is not single quote, parse some of
|
|
the shell expansions that must be read as a single word. */
|
|
if (shellexp (character))
|
|
{
|
|
peek_char = shell_getc (1);
|
|
/* $(...), <(...), >(...), $((...)), ${...}, and $[...] constructs */
|
|
if MBTEST(peek_char == '(' ||
|
|
((peek_char == '{' || peek_char == '[') && character == '$')) /* ) ] } */
|
|
{
|
|
if (peek_char == '{') /* } */
|
|
ttok = parse_matched_pair (cd, '{', '}', &ttoklen, P_FIRSTCLOSE|P_DOLBRACE);
|
|
else if (peek_char == '(') /* ) */
|
|
{
|
|
/* XXX - push and pop the `(' as a delimiter for use by
|
|
the command-oriented-history code. This way newlines
|
|
appearing in the $(...) string get added to the
|
|
history literally rather than causing a possibly-
|
|
incorrect `;' to be added. ) */
|
|
push_delimiter (dstack, peek_char);
|
|
ttok = parse_comsub (cd, '(', ')', &ttoklen, P_COMMAND);
|
|
pop_delimiter (dstack);
|
|
}
|
|
else
|
|
ttok = parse_matched_pair (cd, '[', ']', &ttoklen, 0);
|
|
if (ttok == &matched_pair_error)
|
|
return -1; /* Bail immediately. */
|
|
RESIZE_MALLOCED_BUFFER (token, token_index, ttoklen + 3,
|
|
token_buffer_size,
|
|
TOKEN_DEFAULT_GROW_SIZE);
|
|
token[token_index++] = character;
|
|
token[token_index++] = peek_char;
|
|
strcpy (token + token_index, ttok);
|
|
token_index += ttoklen;
|
|
FREE (ttok);
|
|
dollar_present = 1;
|
|
all_digit_token = 0;
|
|
goto next_character;
|
|
}
|
|
/* This handles $'...' and $"..." new-style quoted strings. */
|
|
else if MBTEST(character == '$' && (peek_char == '\'' || peek_char == '"'))
|
|
{
|
|
int first_line;
|
|
|
|
first_line = line_number;
|
|
push_delimiter (dstack, peek_char);
|
|
ttok = parse_matched_pair (peek_char, peek_char, peek_char,
|
|
&ttoklen,
|
|
(peek_char == '\'') ? P_ALLOWESC : 0);
|
|
pop_delimiter (dstack);
|
|
if (ttok == &matched_pair_error)
|
|
return -1;
|
|
if (peek_char == '\'')
|
|
{
|
|
ttrans = ansiexpand (ttok, 0, ttoklen - 1, &ttranslen);
|
|
free (ttok);
|
|
|
|
/* Insert the single quotes and correctly quote any
|
|
embedded single quotes (allowed because P_ALLOWESC was
|
|
passed to parse_matched_pair). */
|
|
ttok = sh_single_quote (ttrans);
|
|
free (ttrans);
|
|
ttranslen = strlen (ttok);
|
|
ttrans = ttok;
|
|
}
|
|
else
|
|
{
|
|
/* Try to locale-expand the converted string. */
|
|
ttrans = localeexpand (ttok, 0, ttoklen - 1, first_line, &ttranslen);
|
|
free (ttok);
|
|
|
|
/* Add the double quotes back */
|
|
ttok = sh_mkdoublequoted (ttrans, ttranslen, 0);
|
|
free (ttrans);
|
|
ttranslen += 2;
|
|
ttrans = ttok;
|
|
}
|
|
|
|
RESIZE_MALLOCED_BUFFER (token, token_index, ttranslen + 1,
|
|
token_buffer_size,
|
|
TOKEN_DEFAULT_GROW_SIZE);
|
|
strcpy (token + token_index, ttrans);
|
|
token_index += ttranslen;
|
|
FREE (ttrans);
|
|
quoted = 1;
|
|
all_digit_token = 0;
|
|
goto next_character;
|
|
}
|
|
/* This could eventually be extended to recognize all of the
|
|
shell's single-character parameter expansions, and set flags.*/
|
|
else if MBTEST(character == '$' && peek_char == '$')
|
|
{
|
|
RESIZE_MALLOCED_BUFFER (token, token_index, 3,
|
|
token_buffer_size,
|
|
TOKEN_DEFAULT_GROW_SIZE);
|
|
token[token_index++] = '$';
|
|
token[token_index++] = peek_char;
|
|
dollar_present = 1;
|
|
all_digit_token = 0;
|
|
goto next_character;
|
|
}
|
|
else
|
|
shell_ungetc (peek_char);
|
|
}
|
|
|
|
#if defined (ARRAY_VARS)
|
|
/* Identify possible array subscript assignment; match [...]. If
|
|
parser_state&PST_COMPASSIGN, we need to parse [sub]=words treating
|
|
`sub' as if it were enclosed in double quotes. */
|
|
else if MBTEST(character == '[' && /* ] */
|
|
((token_index > 0 && assignment_acceptable (last_read_token) && token_is_ident (token, token_index)) ||
|
|
(token_index == 0 && (parser_state&PST_COMPASSIGN))))
|
|
{
|
|
ttok = parse_matched_pair (cd, '[', ']', &ttoklen, P_ARRAYSUB);
|
|
if (ttok == &matched_pair_error)
|
|
return -1; /* Bail immediately. */
|
|
RESIZE_MALLOCED_BUFFER (token, token_index, ttoklen + 2,
|
|
token_buffer_size,
|
|
TOKEN_DEFAULT_GROW_SIZE);
|
|
token[token_index++] = character;
|
|
strcpy (token + token_index, ttok);
|
|
token_index += ttoklen;
|
|
FREE (ttok);
|
|
all_digit_token = 0;
|
|
goto next_character;
|
|
}
|
|
/* Identify possible compound array variable assignment. */
|
|
else if MBTEST(character == '=' && token_index > 0 && (assignment_acceptable (last_read_token) || (parser_state & PST_ASSIGNOK)) && token_is_assignment (token, token_index))
|
|
{
|
|
peek_char = shell_getc (1);
|
|
if MBTEST(peek_char == '(') /* ) */
|
|
{
|
|
ttok = parse_compound_assignment (&ttoklen);
|
|
|
|
RESIZE_MALLOCED_BUFFER (token, token_index, ttoklen + 4,
|
|
token_buffer_size,
|
|
TOKEN_DEFAULT_GROW_SIZE);
|
|
|
|
token[token_index++] = '=';
|
|
token[token_index++] = '(';
|
|
if (ttok)
|
|
{
|
|
strcpy (token + token_index, ttok);
|
|
token_index += ttoklen;
|
|
}
|
|
token[token_index++] = ')';
|
|
FREE (ttok);
|
|
all_digit_token = 0;
|
|
compound_assignment = 1;
|
|
#if 1
|
|
goto next_character;
|
|
#else
|
|
goto got_token; /* ksh93 seems to do this */
|
|
#endif
|
|
}
|
|
else
|
|
shell_ungetc (peek_char);
|
|
}
|
|
#endif
|
|
|
|
/* When not parsing a multi-character word construct, shell meta-
|
|
characters break words. */
|
|
if MBTEST(shellbreak (character))
|
|
{
|
|
shell_ungetc (character);
|
|
goto got_token;
|
|
}
|
|
|
|
got_character:
|
|
if (character == CTLESC || character == CTLNUL)
|
|
{
|
|
RESIZE_MALLOCED_BUFFER (token, token_index, 2, token_buffer_size,
|
|
TOKEN_DEFAULT_GROW_SIZE);
|
|
token[token_index++] = CTLESC;
|
|
}
|
|
else
|
|
got_escaped_character:
|
|
RESIZE_MALLOCED_BUFFER (token, token_index, 1, token_buffer_size,
|
|
TOKEN_DEFAULT_GROW_SIZE);
|
|
|
|
token[token_index++] = character;
|
|
|
|
all_digit_token &= DIGIT (character);
|
|
dollar_present |= character == '$';
|
|
|
|
next_character:
|
|
if (character == '\n' && SHOULD_PROMPT ())
|
|
prompt_again ();
|
|
|
|
/* We want to remove quoted newlines (that is, a \<newline> pair)
|
|
unless we are within single quotes or pass_next_character is
|
|
set (the shell equivalent of literal-next). */
|
|
cd = current_delimiter (dstack);
|
|
character = shell_getc (cd != '\'' && pass_next_character == 0);
|
|
} /* end for (;;) */
|
|
|
|
got_token:
|
|
|
|
/* Calls to RESIZE_MALLOCED_BUFFER ensure there is sufficient room. */
|
|
token[token_index] = '\0';
|
|
|
|
/* Check to see what thing we should return. If the last_read_token
|
|
is a `<', or a `&', or the character which ended this token is
|
|
a '>' or '<', then, and ONLY then, is this input token a NUMBER.
|
|
Otherwise, it is just a word, and should be returned as such. */
|
|
if MBTEST(all_digit_token && (character == '<' || character == '>' ||
|
|
last_read_token == LESS_AND ||
|
|
last_read_token == GREATER_AND))
|
|
{
|
|
if (legal_number (token, &lvalue) && (int)lvalue == lvalue)
|
|
{
|
|
yylval.number = lvalue;
|
|
return (NUMBER);
|
|
}
|
|
}
|
|
|
|
/* Check for special case tokens. */
|
|
result = (last_shell_getc_is_singlebyte) ? special_case_tokens (token) : -1;
|
|
if (result >= 0)
|
|
return result;
|
|
|
|
#if defined (ALIAS)
|
|
/* Posix.2 does not allow reserved words to be aliased, so check for all
|
|
of them, including special cases, before expanding the current token
|
|
as an alias. */
|
|
if MBTEST(posixly_correct)
|
|
CHECK_FOR_RESERVED_WORD (token);
|
|
|
|
/* Aliases are expanded iff EXPAND_ALIASES is non-zero, and quoting
|
|
inhibits alias expansion. */
|
|
if (expand_aliases && quoted == 0)
|
|
{
|
|
result = alias_expand_token (token);
|
|
if (result == RE_READ_TOKEN)
|
|
return (RE_READ_TOKEN);
|
|
else if (result == NO_EXPANSION)
|
|
parser_state &= ~PST_ALEXPNEXT;
|
|
}
|
|
|
|
/* If not in Posix.2 mode, check for reserved words after alias
|
|
expansion. */
|
|
if MBTEST(posixly_correct == 0)
|
|
#endif
|
|
CHECK_FOR_RESERVED_WORD (token);
|
|
|
|
the_word = alloc_word_desc ();
|
|
the_word->word = (char *)xmalloc (1 + token_index);
|
|
the_word->flags = 0;
|
|
strcpy (the_word->word, token);
|
|
if (dollar_present)
|
|
the_word->flags |= W_HASDOLLAR;
|
|
if (quoted)
|
|
the_word->flags |= W_QUOTED; /*(*/
|
|
if (compound_assignment && token[token_index-1] == ')')
|
|
the_word->flags |= W_COMPASSIGN;
|
|
/* A word is an assignment if it appears at the beginning of a
|
|
simple command, or after another assignment word. This is
|
|
context-dependent, so it cannot be handled in the grammar. */
|
|
if (assignment (token, (parser_state & PST_COMPASSIGN) != 0))
|
|
{
|
|
the_word->flags |= W_ASSIGNMENT;
|
|
/* Don't perform word splitting on assignment statements. */
|
|
if (assignment_acceptable (last_read_token) || (parser_state & PST_COMPASSIGN) != 0)
|
|
{
|
|
the_word->flags |= W_NOSPLIT;
|
|
if (parser_state & PST_COMPASSIGN)
|
|
the_word->flags |= W_NOGLOB; /* XXX - W_NOBRACE? */
|
|
}
|
|
}
|
|
|
|
if (command_token_position (last_read_token))
|
|
{
|
|
struct builtin *b;
|
|
b = builtin_address_internal (token, 0);
|
|
if (b && (b->flags & ASSIGNMENT_BUILTIN))
|
|
parser_state |= PST_ASSIGNOK;
|
|
else if (STREQ (token, "eval") || STREQ (token, "let"))
|
|
parser_state |= PST_ASSIGNOK;
|
|
}
|
|
|
|
yylval.word = the_word;
|
|
|
|
if (token[0] == '{' && token[token_index-1] == '}' &&
|
|
(character == '<' || character == '>'))
|
|
{
|
|
/* can use token; already copied to the_word */
|
|
token[token_index-1] = '\0';
|
|
#if defined (ARRAY_VARS)
|
|
if (legal_identifier (token+1) || valid_array_reference (token+1, 0))
|
|
#else
|
|
if (legal_identifier (token+1))
|
|
#endif
|
|
{
|
|
strcpy (the_word->word, token+1);
|
|
/*itrace("read_token_word: returning REDIR_WORD for %s", the_word->word);*/
|
|
return (REDIR_WORD);
|
|
}
|
|
}
|
|
|
|
result = ((the_word->flags & (W_ASSIGNMENT|W_NOSPLIT)) == (W_ASSIGNMENT|W_NOSPLIT))
|
|
? ASSIGNMENT_WORD : WORD;
|
|
|
|
switch (last_read_token)
|
|
{
|
|
case FUNCTION:
|
|
parser_state |= PST_ALLOWOPNBRC;
|
|
function_dstart = line_number;
|
|
break;
|
|
case CASE:
|
|
case SELECT:
|
|
case FOR:
|
|
if (word_top < MAX_CASE_NEST)
|
|
word_top++;
|
|
word_lineno[word_top] = line_number;
|
|
break;
|
|
}
|
|
|
|
return (result);
|
|
}
|
|
|
|
/* Return 1 if TOKSYM is a token that after being read would allow
|
|
a reserved word to be seen, else 0. */
|
|
static int
|
|
reserved_word_acceptable (toksym)
|
|
int toksym;
|
|
{
|
|
switch (toksym)
|
|
{
|
|
case '\n':
|
|
case ';':
|
|
case '(':
|
|
case ')':
|
|
case '|':
|
|
case '&':
|
|
case '{':
|
|
case '}': /* XXX */
|
|
case AND_AND:
|
|
case BANG:
|
|
case BAR_AND:
|
|
case DO:
|
|
case DONE:
|
|
case ELIF:
|
|
case ELSE:
|
|
case ESAC:
|
|
case FI:
|
|
case IF:
|
|
case OR_OR:
|
|
case SEMI_SEMI:
|
|
case SEMI_AND:
|
|
case SEMI_SEMI_AND:
|
|
case THEN:
|
|
case TIME:
|
|
case TIMEOPT:
|
|
case TIMEIGN:
|
|
case COPROC:
|
|
case UNTIL:
|
|
case WHILE:
|
|
case 0:
|
|
return 1;
|
|
default:
|
|
#if defined (COPROCESS_SUPPORT)
|
|
if (last_read_token == WORD && token_before_that == COPROC)
|
|
return 1;
|
|
#endif
|
|
if (last_read_token == WORD && token_before_that == FUNCTION)
|
|
return 1;
|
|
return 0;
|
|
}
|
|
}
|
|
|
|
/* Return the index of TOKEN in the alist of reserved words, or -1 if
|
|
TOKEN is not a shell reserved word. */
|
|
int
|
|
find_reserved_word (tokstr)
|
|
char *tokstr;
|
|
{
|
|
int i;
|
|
for (i = 0; word_token_alist[i].word; i++)
|
|
if (STREQ (tokstr, word_token_alist[i].word))
|
|
return i;
|
|
return -1;
|
|
}
|
|
|
|
/* An interface to let the rest of the shell (primarily the completion
|
|
system) know what the parser is expecting. */
|
|
int
|
|
parser_in_command_position ()
|
|
{
|
|
return (command_token_position (last_read_token));
|
|
}
|
|
|
|
#if 0
|
|
#if defined (READLINE)
|
|
/* Called after each time readline is called. This insures that whatever
|
|
the new prompt string is gets propagated to readline's local prompt
|
|
variable. */
|
|
static void
|
|
reset_readline_prompt ()
|
|
{
|
|
char *temp_prompt;
|
|
|
|
if (prompt_string_pointer)
|
|
{
|
|
temp_prompt = (*prompt_string_pointer)
|
|
? decode_prompt_string (*prompt_string_pointer)
|
|
: (char *)NULL;
|
|
|
|
if (temp_prompt == 0)
|
|
{
|
|
temp_prompt = (char *)xmalloc (1);
|
|
temp_prompt[0] = '\0';
|
|
}
|
|
|
|
FREE (current_readline_prompt);
|
|
current_readline_prompt = temp_prompt;
|
|
}
|
|
}
|
|
#endif /* READLINE */
|
|
#endif /* 0 */
|
|
|
|
#if defined (HISTORY)
|
|
/* A list of tokens which can be followed by newlines, but not by
|
|
semi-colons. When concatenating multiple lines of history, the
|
|
newline separator for such tokens is replaced with a space. */
|
|
static const int no_semi_successors[] = {
|
|
'\n', '{', '(', ')', ';', '&', '|',
|
|
CASE, DO, ELSE, IF, SEMI_SEMI, SEMI_AND, SEMI_SEMI_AND, THEN, UNTIL,
|
|
WHILE, AND_AND, OR_OR, IN,
|
|
0
|
|
};
|
|
|
|
/* If we are not within a delimited expression, try to be smart
|
|
about which separators can be semi-colons and which must be
|
|
newlines. Returns the string that should be added into the
|
|
history entry. LINE is the line we're about to add; it helps
|
|
make some more intelligent decisions in certain cases. */
|
|
char *
|
|
history_delimiting_chars (line)
|
|
const char *line;
|
|
{
|
|
static int last_was_heredoc = 0; /* was the last entry the start of a here document? */
|
|
register int i;
|
|
|
|
if ((parser_state & PST_HEREDOC) == 0)
|
|
last_was_heredoc = 0;
|
|
|
|
if (dstack.delimiter_depth != 0)
|
|
return ("\n");
|
|
|
|
/* We look for current_command_line_count == 2 because we are looking to
|
|
add the first line of the body of the here document (the second line
|
|
of the command). We also keep LAST_WAS_HEREDOC as a private sentinel
|
|
variable to note when we think we added the first line of a here doc
|
|
(the one with a "<<" somewhere in it) */
|
|
if (parser_state & PST_HEREDOC)
|
|
{
|
|
if (last_was_heredoc)
|
|
{
|
|
last_was_heredoc = 0;
|
|
return "\n";
|
|
}
|
|
return (here_doc_first_line ? "\n" : "");
|
|
}
|
|
|
|
if (parser_state & PST_COMPASSIGN)
|
|
return (" ");
|
|
|
|
/* First, handle some special cases. */
|
|
/*(*/
|
|
/* If we just read `()', assume it's a function definition, and don't
|
|
add a semicolon. If the token before the `)' was not `(', and we're
|
|
not in the midst of parsing a case statement, assume it's a
|
|
parenthesized command and add the semicolon. */
|
|
/*)(*/
|
|
if (token_before_that == ')')
|
|
{
|
|
if (two_tokens_ago == '(') /*)*/ /* function def */
|
|
return " ";
|
|
/* This does not work for subshells inside case statement
|
|
command lists. It's a suboptimal solution. */
|
|
else if (parser_state & PST_CASESTMT) /* case statement pattern */
|
|
return " ";
|
|
else
|
|
return "; "; /* (...) subshell */
|
|
}
|
|
else if (token_before_that == WORD && two_tokens_ago == FUNCTION)
|
|
return " "; /* function def using `function name' without `()' */
|
|
|
|
/* If we're not in a here document, but we think we're about to parse one,
|
|
and we would otherwise return a `;', return a newline to delimit the
|
|
line with the here-doc delimiter */
|
|
else if ((parser_state & PST_HEREDOC) == 0 && current_command_line_count > 1 && last_read_token == '\n' && strstr (line, "<<"))
|
|
{
|
|
last_was_heredoc = 1;
|
|
return "\n";
|
|
}
|
|
else if ((parser_state & PST_HEREDOC) == 0 && current_command_line_count > 1 && need_here_doc > 0)
|
|
return "\n";
|
|
else if (token_before_that == WORD && two_tokens_ago == FOR)
|
|
{
|
|
/* Tricky. `for i\nin ...' should not have a semicolon, but
|
|
`for i\ndo ...' should. We do what we can. */
|
|
for (i = shell_input_line_index; whitespace (shell_input_line[i]); i++)
|
|
;
|
|
if (shell_input_line[i] && shell_input_line[i] == 'i' && shell_input_line[i+1] == 'n')
|
|
return " ";
|
|
return ";";
|
|
}
|
|
else if (two_tokens_ago == CASE && token_before_that == WORD && (parser_state & PST_CASESTMT))
|
|
return " ";
|
|
|
|
for (i = 0; no_semi_successors[i]; i++)
|
|
{
|
|
if (token_before_that == no_semi_successors[i])
|
|
return (" ");
|
|
}
|
|
|
|
return ("; ");
|
|
}
|
|
#endif /* HISTORY */
|
|
|
|
/* Issue a prompt, or prepare to issue a prompt when the next character
|
|
is read. */
|
|
static void
|
|
prompt_again ()
|
|
{
|
|
char *temp_prompt;
|
|
|
|
if (interactive == 0 || expanding_alias ()) /* XXX */
|
|
return;
|
|
|
|
ps1_prompt = get_string_value ("PS1");
|
|
ps2_prompt = get_string_value ("PS2");
|
|
|
|
ps0_prompt = get_string_value ("PS0");
|
|
|
|
if (!prompt_string_pointer)
|
|
prompt_string_pointer = &ps1_prompt;
|
|
|
|
temp_prompt = *prompt_string_pointer
|
|
? decode_prompt_string (*prompt_string_pointer)
|
|
: (char *)NULL;
|
|
|
|
if (temp_prompt == 0)
|
|
{
|
|
temp_prompt = (char *)xmalloc (1);
|
|
temp_prompt[0] = '\0';
|
|
}
|
|
|
|
current_prompt_string = *prompt_string_pointer;
|
|
prompt_string_pointer = &ps2_prompt;
|
|
|
|
#if defined (READLINE)
|
|
if (!no_line_editing)
|
|
{
|
|
FREE (current_readline_prompt);
|
|
current_readline_prompt = temp_prompt;
|
|
}
|
|
else
|
|
#endif /* READLINE */
|
|
{
|
|
FREE (current_decoded_prompt);
|
|
current_decoded_prompt = temp_prompt;
|
|
}
|
|
}
|
|
|
|
int
|
|
get_current_prompt_level ()
|
|
{
|
|
return ((current_prompt_string && current_prompt_string == ps2_prompt) ? 2 : 1);
|
|
}
|
|
|
|
void
|
|
set_current_prompt_level (x)
|
|
int x;
|
|
{
|
|
prompt_string_pointer = (x == 2) ? &ps2_prompt : &ps1_prompt;
|
|
current_prompt_string = *prompt_string_pointer;
|
|
}
|
|
|
|
static void
|
|
print_prompt ()
|
|
{
|
|
fprintf (stderr, "%s", current_decoded_prompt);
|
|
fflush (stderr);
|
|
}
|
|
|
|
/* Return a string which will be printed as a prompt. The string
|
|
may contain special characters which are decoded as follows:
|
|
|
|
\a bell (ascii 07)
|
|
\d the date in Day Mon Date format
|
|
\e escape (ascii 033)
|
|
\h the hostname up to the first `.'
|
|
\H the hostname
|
|
\j the number of active jobs
|
|
\l the basename of the shell's tty device name
|
|
\n CRLF
|
|
\r CR
|
|
\s the name of the shell
|
|
\t the time in 24-hour hh:mm:ss format
|
|
\T the time in 12-hour hh:mm:ss format
|
|
\@ the time in 12-hour hh:mm am/pm format
|
|
\A the time in 24-hour hh:mm format
|
|
\D{fmt} the result of passing FMT to strftime(3)
|
|
\u your username
|
|
\v the version of bash (e.g., 2.00)
|
|
\V the release of bash, version + patchlevel (e.g., 2.00.0)
|
|
\w the current working directory
|
|
\W the last element of $PWD
|
|
\! the history number of this command
|
|
\# the command number of this command
|
|
\$ a $ or a # if you are root
|
|
\nnn character code nnn in octal
|
|
\\ a backslash
|
|
\[ begin a sequence of non-printing chars
|
|
\] end a sequence of non-printing chars
|
|
*/
|
|
#define PROMPT_GROWTH 48
|
|
char *
|
|
decode_prompt_string (string)
|
|
char *string;
|
|
{
|
|
WORD_LIST *list;
|
|
char *result, *t;
|
|
struct dstack save_dstack;
|
|
int last_exit_value, last_comsub_pid;
|
|
#if defined (PROMPT_STRING_DECODE)
|
|
size_t result_size;
|
|
int result_index;
|
|
int c, n, i;
|
|
char *temp, *t_host, octal_string[4];
|
|
struct tm *tm;
|
|
time_t the_time;
|
|
char timebuf[128];
|
|
char *timefmt;
|
|
|
|
result = (char *)xmalloc (result_size = PROMPT_GROWTH);
|
|
result[result_index = 0] = 0;
|
|
temp = (char *)NULL;
|
|
|
|
while (c = *string++)
|
|
{
|
|
if (posixly_correct && c == '!')
|
|
{
|
|
if (*string == '!')
|
|
{
|
|
temp = savestring ("!");
|
|
goto add_string;
|
|
}
|
|
else
|
|
{
|
|
#if !defined (HISTORY)
|
|
temp = savestring ("1");
|
|
#else /* HISTORY */
|
|
temp = itos (history_number ());
|
|
#endif /* HISTORY */
|
|
string--; /* add_string increments string again. */
|
|
goto add_string;
|
|
}
|
|
}
|
|
if (c == '\\')
|
|
{
|
|
c = *string;
|
|
|
|
switch (c)
|
|
{
|
|
case '0':
|
|
case '1':
|
|
case '2':
|
|
case '3':
|
|
case '4':
|
|
case '5':
|
|
case '6':
|
|
case '7':
|
|
strncpy (octal_string, string, 3);
|
|
octal_string[3] = '\0';
|
|
|
|
n = read_octal (octal_string);
|
|
temp = (char *)xmalloc (3);
|
|
|
|
if (n == CTLESC || n == CTLNUL)
|
|
{
|
|
temp[0] = CTLESC;
|
|
temp[1] = n;
|
|
temp[2] = '\0';
|
|
}
|
|
else if (n == -1)
|
|
{
|
|
temp[0] = '\\';
|
|
temp[1] = '\0';
|
|
}
|
|
else
|
|
{
|
|
temp[0] = n;
|
|
temp[1] = '\0';
|
|
}
|
|
|
|
for (c = 0; n != -1 && c < 3 && ISOCTAL (*string); c++)
|
|
string++;
|
|
|
|
c = 0; /* tested at add_string: */
|
|
goto add_string;
|
|
|
|
case 'd':
|
|
case 't':
|
|
case 'T':
|
|
case '@':
|
|
case 'A':
|
|
/* Make the current time/date into a string. */
|
|
(void) time (&the_time);
|
|
#if defined (HAVE_TZSET)
|
|
sv_tz ("TZ"); /* XXX -- just make sure */
|
|
#endif
|
|
tm = localtime (&the_time);
|
|
|
|
if (c == 'd')
|
|
n = strftime (timebuf, sizeof (timebuf), "%a %b %d", tm);
|
|
else if (c == 't')
|
|
n = strftime (timebuf, sizeof (timebuf), "%H:%M:%S", tm);
|
|
else if (c == 'T')
|
|
n = strftime (timebuf, sizeof (timebuf), "%I:%M:%S", tm);
|
|
else if (c == '@')
|
|
n = strftime (timebuf, sizeof (timebuf), "%I:%M %p", tm);
|
|
else if (c == 'A')
|
|
n = strftime (timebuf, sizeof (timebuf), "%H:%M", tm);
|
|
|
|
if (n == 0)
|
|
timebuf[0] = '\0';
|
|
else
|
|
timebuf[sizeof(timebuf) - 1] = '\0';
|
|
|
|
temp = savestring (timebuf);
|
|
goto add_string;
|
|
|
|
case 'D': /* strftime format */
|
|
if (string[1] != '{') /* } */
|
|
goto not_escape;
|
|
|
|
(void) time (&the_time);
|
|
tm = localtime (&the_time);
|
|
string += 2; /* skip { */
|
|
timefmt = xmalloc (strlen (string) + 3);
|
|
for (t = timefmt; *string && *string != '}'; )
|
|
*t++ = *string++;
|
|
*t = '\0';
|
|
c = *string; /* tested at add_string */
|
|
if (timefmt[0] == '\0')
|
|
{
|
|
timefmt[0] = '%';
|
|
timefmt[1] = 'X'; /* locale-specific current time */
|
|
timefmt[2] = '\0';
|
|
}
|
|
n = strftime (timebuf, sizeof (timebuf), timefmt, tm);
|
|
free (timefmt);
|
|
|
|
if (n == 0)
|
|
timebuf[0] = '\0';
|
|
else
|
|
timebuf[sizeof(timebuf) - 1] = '\0';
|
|
|
|
if (promptvars || posixly_correct)
|
|
/* Make sure that expand_prompt_string is called with a
|
|
second argument of Q_DOUBLE_QUOTES if we use this
|
|
function here. */
|
|
temp = sh_backslash_quote_for_double_quotes (timebuf);
|
|
else
|
|
temp = savestring (timebuf);
|
|
goto add_string;
|
|
|
|
case 'n':
|
|
temp = (char *)xmalloc (3);
|
|
temp[0] = no_line_editing ? '\n' : '\r';
|
|
temp[1] = no_line_editing ? '\0' : '\n';
|
|
temp[2] = '\0';
|
|
goto add_string;
|
|
|
|
case 's':
|
|
temp = base_pathname (shell_name);
|
|
/* Try to quote anything the user can set in the file system */
|
|
if (promptvars || posixly_correct)
|
|
temp = sh_backslash_quote_for_double_quotes (temp);
|
|
else
|
|
temp = savestring (temp);
|
|
goto add_string;
|
|
|
|
case 'v':
|
|
case 'V':
|
|
temp = (char *)xmalloc (16);
|
|
if (c == 'v')
|
|
strcpy (temp, dist_version);
|
|
else
|
|
sprintf (temp, "%s.%d", dist_version, patch_level);
|
|
goto add_string;
|
|
|
|
case 'w':
|
|
case 'W':
|
|
{
|
|
/* Use the value of PWD because it is much more efficient. */
|
|
char t_string[PATH_MAX];
|
|
int tlen;
|
|
|
|
temp = get_string_value ("PWD");
|
|
|
|
if (temp == 0)
|
|
{
|
|
if (getcwd (t_string, sizeof(t_string)) == 0)
|
|
{
|
|
t_string[0] = '.';
|
|
tlen = 1;
|
|
}
|
|
else
|
|
tlen = strlen (t_string);
|
|
}
|
|
else
|
|
{
|
|
tlen = sizeof (t_string) - 1;
|
|
strncpy (t_string, temp, tlen);
|
|
}
|
|
t_string[tlen] = '\0';
|
|
|
|
#if defined (MACOSX)
|
|
/* Convert from "fs" format to "input" format */
|
|
temp = fnx_fromfs (t_string, strlen (t_string));
|
|
if (temp != t_string)
|
|
strcpy (t_string, temp);
|
|
#endif
|
|
|
|
#define ROOT_PATH(x) ((x)[0] == '/' && (x)[1] == 0)
|
|
#define DOUBLE_SLASH_ROOT(x) ((x)[0] == '/' && (x)[1] == '/' && (x)[2] == 0)
|
|
/* Abbreviate \W as ~ if $PWD == $HOME */
|
|
if (c == 'W' && (((t = get_string_value ("HOME")) == 0) || STREQ (t, t_string) == 0))
|
|
{
|
|
if (ROOT_PATH (t_string) == 0 && DOUBLE_SLASH_ROOT (t_string) == 0)
|
|
{
|
|
t = strrchr (t_string, '/');
|
|
if (t)
|
|
memmove (t_string, t + 1, strlen (t)); /* strlen(t) to copy NULL */
|
|
}
|
|
}
|
|
#undef ROOT_PATH
|
|
#undef DOUBLE_SLASH_ROOT
|
|
else
|
|
{
|
|
/* polite_directory_format is guaranteed to return a string
|
|
no longer than PATH_MAX - 1 characters. */
|
|
temp = polite_directory_format (t_string);
|
|
if (temp != t_string)
|
|
strcpy (t_string, temp);
|
|
}
|
|
|
|
temp = trim_pathname (t_string, PATH_MAX - 1);
|
|
/* If we're going to be expanding the prompt string later,
|
|
quote the directory name. */
|
|
if (promptvars || posixly_correct)
|
|
/* Make sure that expand_prompt_string is called with a
|
|
second argument of Q_DOUBLE_QUOTES if we use this
|
|
function here. */
|
|
temp = sh_backslash_quote_for_double_quotes (t_string);
|
|
else
|
|
temp = savestring (t_string);
|
|
|
|
goto add_string;
|
|
}
|
|
|
|
case 'u':
|
|
if (current_user.user_name == 0)
|
|
get_current_user_info ();
|
|
temp = savestring (current_user.user_name);
|
|
goto add_string;
|
|
|
|
case 'h':
|
|
case 'H':
|
|
t_host = savestring (current_host_name);
|
|
if (c == 'h' && (t = (char *)strchr (t_host, '.')))
|
|
*t = '\0';
|
|
if (promptvars || posixly_correct)
|
|
/* Make sure that expand_prompt_string is called with a
|
|
second argument of Q_DOUBLE_QUOTES if we use this
|
|
function here. */
|
|
temp = sh_backslash_quote_for_double_quotes (t_host);
|
|
else
|
|
temp = savestring (t_host);
|
|
free (t_host);
|
|
goto add_string;
|
|
|
|
case '#':
|
|
temp = itos (current_command_number);
|
|
goto add_string;
|
|
|
|
case '!':
|
|
#if !defined (HISTORY)
|
|
temp = savestring ("1");
|
|
#else /* HISTORY */
|
|
temp = itos (history_number ());
|
|
#endif /* HISTORY */
|
|
goto add_string;
|
|
|
|
case '$':
|
|
t = temp = (char *)xmalloc (3);
|
|
if ((promptvars || posixly_correct) && (current_user.euid != 0))
|
|
*t++ = '\\';
|
|
*t++ = current_user.euid == 0 ? '#' : '$';
|
|
*t = '\0';
|
|
goto add_string;
|
|
|
|
case 'j':
|
|
temp = itos (count_all_jobs ());
|
|
goto add_string;
|
|
|
|
case 'l':
|
|
#if defined (HAVE_TTYNAME)
|
|
temp = (char *)ttyname (fileno (stdin));
|
|
t = temp ? base_pathname (temp) : "tty";
|
|
temp = savestring (t);
|
|
#else
|
|
temp = savestring ("tty");
|
|
#endif /* !HAVE_TTYNAME */
|
|
goto add_string;
|
|
|
|
#if defined (READLINE)
|
|
case '[':
|
|
case ']':
|
|
if (no_line_editing)
|
|
{
|
|
string++;
|
|
break;
|
|
}
|
|
temp = (char *)xmalloc (3);
|
|
n = (c == '[') ? RL_PROMPT_START_IGNORE : RL_PROMPT_END_IGNORE;
|
|
i = 0;
|
|
if (n == CTLESC || n == CTLNUL)
|
|
temp[i++] = CTLESC;
|
|
temp[i++] = n;
|
|
temp[i] = '\0';
|
|
goto add_string;
|
|
#endif /* READLINE */
|
|
|
|
case '\\':
|
|
case 'a':
|
|
case 'e':
|
|
case 'r':
|
|
temp = (char *)xmalloc (2);
|
|
if (c == 'a')
|
|
temp[0] = '\07';
|
|
else if (c == 'e')
|
|
temp[0] = '\033';
|
|
else if (c == 'r')
|
|
temp[0] = '\r';
|
|
else /* (c == '\\') */
|
|
temp[0] = c;
|
|
temp[1] = '\0';
|
|
goto add_string;
|
|
|
|
default:
|
|
not_escape:
|
|
temp = (char *)xmalloc (3);
|
|
temp[0] = '\\';
|
|
temp[1] = c;
|
|
temp[2] = '\0';
|
|
|
|
add_string:
|
|
if (c)
|
|
string++;
|
|
result =
|
|
sub_append_string (temp, result, &result_index, &result_size);
|
|
temp = (char *)NULL; /* Freed in sub_append_string (). */
|
|
result[result_index] = '\0';
|
|
break;
|
|
}
|
|
}
|
|
else
|
|
{
|
|
RESIZE_MALLOCED_BUFFER (result, result_index, 3, result_size, PROMPT_GROWTH);
|
|
/* dequote_string should take care of removing this if we are not
|
|
performing the rest of the word expansions. */
|
|
if (c == CTLESC || c == CTLNUL)
|
|
result[result_index++] = CTLESC;
|
|
result[result_index++] = c;
|
|
result[result_index] = '\0';
|
|
}
|
|
}
|
|
#else /* !PROMPT_STRING_DECODE */
|
|
result = savestring (string);
|
|
#endif /* !PROMPT_STRING_DECODE */
|
|
|
|
/* Save the delimiter stack and point `dstack' to temp space so any
|
|
command substitutions in the prompt string won't result in screwing
|
|
up the parser's quoting state. */
|
|
save_dstack = dstack;
|
|
dstack = temp_dstack;
|
|
dstack.delimiter_depth = 0;
|
|
|
|
/* Perform variable and parameter expansion and command substitution on
|
|
the prompt string. */
|
|
if (promptvars || posixly_correct)
|
|
{
|
|
last_exit_value = last_command_exit_value;
|
|
last_comsub_pid = last_command_subst_pid;
|
|
list = expand_prompt_string (result, Q_DOUBLE_QUOTES, 0);
|
|
free (result);
|
|
result = string_list (list);
|
|
dispose_words (list);
|
|
last_command_exit_value = last_exit_value;
|
|
last_command_subst_pid = last_comsub_pid;
|
|
}
|
|
else
|
|
{
|
|
t = dequote_string (result);
|
|
free (result);
|
|
result = t;
|
|
}
|
|
|
|
dstack = save_dstack;
|
|
|
|
return (result);
|
|
}
|
|
|
|
/************************************************
|
|
* *
|
|
* ERROR HANDLING *
|
|
* *
|
|
************************************************/
|
|
|
|
/* Report a syntax error, and restart the parser. Call here for fatal
|
|
errors. */
|
|
int
|
|
yyerror (msg)
|
|
const char *msg;
|
|
{
|
|
report_syntax_error ((char *)NULL);
|
|
reset_parser ();
|
|
return (0);
|
|
}
|
|
|
|
static char *
|
|
error_token_from_token (tok)
|
|
int tok;
|
|
{
|
|
char *t;
|
|
|
|
if (t = find_token_in_alist (tok, word_token_alist, 0))
|
|
return t;
|
|
|
|
if (t = find_token_in_alist (tok, other_token_alist, 0))
|
|
return t;
|
|
|
|
t = (char *)NULL;
|
|
/* This stuff is dicy and needs closer inspection */
|
|
switch (current_token)
|
|
{
|
|
case WORD:
|
|
case ASSIGNMENT_WORD:
|
|
if (yylval.word)
|
|
t = savestring (yylval.word->word);
|
|
break;
|
|
case NUMBER:
|
|
t = itos (yylval.number);
|
|
break;
|
|
case ARITH_CMD:
|
|
if (yylval.word_list)
|
|
t = string_list (yylval.word_list);
|
|
break;
|
|
case ARITH_FOR_EXPRS:
|
|
if (yylval.word_list)
|
|
t = string_list_internal (yylval.word_list, " ; ");
|
|
break;
|
|
case COND_CMD:
|
|
t = (char *)NULL; /* punt */
|
|
break;
|
|
}
|
|
|
|
return t;
|
|
}
|
|
|
|
static char *
|
|
error_token_from_text ()
|
|
{
|
|
char *msg, *t;
|
|
int token_end, i;
|
|
|
|
t = shell_input_line;
|
|
i = shell_input_line_index;
|
|
token_end = 0;
|
|
msg = (char *)NULL;
|
|
|
|
if (i && t[i] == '\0')
|
|
i--;
|
|
|
|
while (i && (whitespace (t[i]) || t[i] == '\n'))
|
|
i--;
|
|
|
|
if (i)
|
|
token_end = i + 1;
|
|
|
|
while (i && (member (t[i], " \n\t;|&") == 0))
|
|
i--;
|
|
|
|
while (i != token_end && (whitespace (t[i]) || t[i] == '\n'))
|
|
i++;
|
|
|
|
/* Return our idea of the offending token. */
|
|
if (token_end || (i == 0 && token_end == 0))
|
|
{
|
|
if (token_end)
|
|
msg = substring (t, i, token_end);
|
|
else /* one-character token */
|
|
{
|
|
msg = (char *)xmalloc (2);
|
|
msg[0] = t[i];
|
|
msg[1] = '\0';
|
|
}
|
|
}
|
|
|
|
return (msg);
|
|
}
|
|
|
|
static void
|
|
print_offending_line ()
|
|
{
|
|
char *msg;
|
|
int token_end;
|
|
|
|
msg = savestring (shell_input_line);
|
|
token_end = strlen (msg);
|
|
while (token_end && msg[token_end - 1] == '\n')
|
|
msg[--token_end] = '\0';
|
|
|
|
parser_error (line_number, "`%s'", msg);
|
|
free (msg);
|
|
}
|
|
|
|
/* Report a syntax error with line numbers, etc.
|
|
Call here for recoverable errors. If you have a message to print,
|
|
then place it in MESSAGE, otherwise pass NULL and this will figure
|
|
out an appropriate message for you. */
|
|
static void
|
|
report_syntax_error (message)
|
|
char *message;
|
|
{
|
|
char *msg, *p;
|
|
|
|
if (message)
|
|
{
|
|
parser_error (line_number, "%s", message);
|
|
if (interactive && EOF_Reached)
|
|
EOF_Reached = 0;
|
|
last_command_exit_value = parse_and_execute_level ? EX_BADSYNTAX : EX_BADUSAGE;
|
|
return;
|
|
}
|
|
|
|
/* If the line of input we're reading is not null, try to find the
|
|
objectionable token. First, try to figure out what token the
|
|
parser's complaining about by looking at current_token. */
|
|
if (current_token != 0 && EOF_Reached == 0 && (msg = error_token_from_token (current_token)))
|
|
{
|
|
if (ansic_shouldquote (msg))
|
|
{
|
|
p = ansic_quote (msg, 0, NULL);
|
|
free (msg);
|
|
msg = p;
|
|
}
|
|
parser_error (line_number, _("syntax error near unexpected token `%s'"), msg);
|
|
free (msg);
|
|
|
|
if (interactive == 0)
|
|
print_offending_line ();
|
|
|
|
last_command_exit_value = parse_and_execute_level ? EX_BADSYNTAX : EX_BADUSAGE;
|
|
return;
|
|
}
|
|
|
|
/* If looking at the current token doesn't prove fruitful, try to find the
|
|
offending token by analyzing the text of the input line near the current
|
|
input line index and report what we find. */
|
|
if (shell_input_line && *shell_input_line)
|
|
{
|
|
msg = error_token_from_text ();
|
|
if (msg)
|
|
{
|
|
parser_error (line_number, _("syntax error near `%s'"), msg);
|
|
free (msg);
|
|
}
|
|
|
|
/* If not interactive, print the line containing the error. */
|
|
if (interactive == 0)
|
|
print_offending_line ();
|
|
}
|
|
else
|
|
{
|
|
msg = EOF_Reached ? _("syntax error: unexpected end of file") : _("syntax error");
|
|
parser_error (line_number, "%s", msg);
|
|
/* When the shell is interactive, this file uses EOF_Reached
|
|
only for error reporting. Other mechanisms are used to
|
|
decide whether or not to exit. */
|
|
if (interactive && EOF_Reached)
|
|
EOF_Reached = 0;
|
|
}
|
|
|
|
last_command_exit_value = parse_and_execute_level ? EX_BADSYNTAX : EX_BADUSAGE;
|
|
}
|
|
|
|
/* ??? Needed function. ??? We have to be able to discard the constructs
|
|
created during parsing. In the case of error, we want to return
|
|
allocated objects to the memory pool. In the case of no error, we want
|
|
to throw away the information about where the allocated objects live.
|
|
(dispose_command () will actually free the command.) */
|
|
static void
|
|
discard_parser_constructs (error_p)
|
|
int error_p;
|
|
{
|
|
}
|
|
|
|
/************************************************
|
|
* *
|
|
* EOF HANDLING *
|
|
* *
|
|
************************************************/
|
|
|
|
/* Do that silly `type "bye" to exit' stuff. You know, "ignoreeof". */
|
|
|
|
/* A flag denoting whether or not ignoreeof is set. */
|
|
int ignoreeof = 0;
|
|
|
|
/* The number of times that we have encountered an EOF character without
|
|
another character intervening. When this gets above the limit, the
|
|
shell terminates. */
|
|
int eof_encountered = 0;
|
|
|
|
/* The limit for eof_encountered. */
|
|
int eof_encountered_limit = 10;
|
|
|
|
/* If we have EOF as the only input unit, this user wants to leave
|
|
the shell. If the shell is not interactive, then just leave.
|
|
Otherwise, if ignoreeof is set, and we haven't done this the
|
|
required number of times in a row, print a message. */
|
|
static void
|
|
handle_eof_input_unit ()
|
|
{
|
|
if (interactive)
|
|
{
|
|
/* shell.c may use this to decide whether or not to write out the
|
|
history, among other things. We use it only for error reporting
|
|
in this file. */
|
|
if (EOF_Reached)
|
|
EOF_Reached = 0;
|
|
|
|
/* If the user wants to "ignore" eof, then let her do so, kind of. */
|
|
if (ignoreeof)
|
|
{
|
|
if (eof_encountered < eof_encountered_limit)
|
|
{
|
|
fprintf (stderr, _("Use \"%s\" to leave the shell.\n"),
|
|
login_shell ? "logout" : "exit");
|
|
eof_encountered++;
|
|
/* Reset the parsing state. */
|
|
last_read_token = current_token = '\n';
|
|
/* Reset the prompt string to be $PS1. */
|
|
prompt_string_pointer = (char **)NULL;
|
|
prompt_again ();
|
|
return;
|
|
}
|
|
}
|
|
|
|
/* In this case EOF should exit the shell. Do it now. */
|
|
reset_parser ();
|
|
exit_builtin ((WORD_LIST *)NULL);
|
|
}
|
|
else
|
|
{
|
|
/* We don't write history files, etc., for non-interactive shells. */
|
|
EOF_Reached = 1;
|
|
}
|
|
}
|
|
|
|
/************************************************
|
|
* *
|
|
* STRING PARSING FUNCTIONS *
|
|
* *
|
|
************************************************/
|
|
|
|
/* It's very important that these two functions treat the characters
|
|
between ( and ) identically. */
|
|
|
|
static WORD_LIST parse_string_error;
|
|
|
|
/* Take a string and run it through the shell parser, returning the
|
|
resultant word list. Used by compound array assignment. */
|
|
WORD_LIST *
|
|
parse_string_to_word_list (s, flags, whom)
|
|
char *s;
|
|
int flags;
|
|
const char *whom;
|
|
{
|
|
WORD_LIST *wl;
|
|
int tok, orig_current_token, orig_line_number, orig_input_terminator;
|
|
int orig_line_count;
|
|
int old_echo_input, old_expand_aliases;
|
|
#if defined (HISTORY)
|
|
int old_remember_on_history, old_history_expansion_inhibited;
|
|
#endif
|
|
|
|
#if defined (HISTORY)
|
|
old_remember_on_history = remember_on_history;
|
|
# if defined (BANG_HISTORY)
|
|
old_history_expansion_inhibited = history_expansion_inhibited;
|
|
# endif
|
|
bash_history_disable ();
|
|
#endif
|
|
|
|
orig_line_number = line_number;
|
|
orig_line_count = current_command_line_count;
|
|
orig_input_terminator = shell_input_line_terminator;
|
|
old_echo_input = echo_input_at_read;
|
|
old_expand_aliases = expand_aliases;
|
|
|
|
push_stream (1);
|
|
last_read_token = WORD; /* WORD to allow reserved words here */
|
|
current_command_line_count = 0;
|
|
echo_input_at_read = expand_aliases = 0;
|
|
|
|
with_input_from_string (s, whom);
|
|
wl = (WORD_LIST *)NULL;
|
|
|
|
if (flags & 1)
|
|
parser_state |= PST_COMPASSIGN|PST_REPARSE;
|
|
|
|
while ((tok = read_token (READ)) != yacc_EOF)
|
|
{
|
|
if (tok == '\n' && *bash_input.location.string == '\0')
|
|
break;
|
|
if (tok == '\n') /* Allow newlines in compound assignments */
|
|
continue;
|
|
if (tok != WORD && tok != ASSIGNMENT_WORD)
|
|
{
|
|
line_number = orig_line_number + line_number - 1;
|
|
orig_current_token = current_token;
|
|
current_token = tok;
|
|
yyerror (NULL); /* does the right thing */
|
|
current_token = orig_current_token;
|
|
if (wl)
|
|
dispose_words (wl);
|
|
wl = &parse_string_error;
|
|
break;
|
|
}
|
|
wl = make_word_list (yylval.word, wl);
|
|
}
|
|
|
|
last_read_token = '\n';
|
|
pop_stream ();
|
|
|
|
#if defined (HISTORY)
|
|
remember_on_history = old_remember_on_history;
|
|
# if defined (BANG_HISTORY)
|
|
history_expansion_inhibited = old_history_expansion_inhibited;
|
|
# endif /* BANG_HISTORY */
|
|
#endif /* HISTORY */
|
|
|
|
echo_input_at_read = old_echo_input;
|
|
expand_aliases = old_expand_aliases;
|
|
|
|
current_command_line_count = orig_line_count;
|
|
shell_input_line_terminator = orig_input_terminator;
|
|
|
|
if (flags & 1)
|
|
parser_state &= ~(PST_COMPASSIGN|PST_REPARSE);
|
|
|
|
if (wl == &parse_string_error)
|
|
{
|
|
last_command_exit_value = EXECUTION_FAILURE;
|
|
if (interactive_shell == 0 && posixly_correct)
|
|
jump_to_top_level (FORCE_EOF);
|
|
else
|
|
jump_to_top_level (DISCARD);
|
|
}
|
|
|
|
return (REVERSE_LIST (wl, WORD_LIST *));
|
|
}
|
|
|
|
static char *
|
|
parse_compound_assignment (retlenp)
|
|
int *retlenp;
|
|
{
|
|
WORD_LIST *wl, *rl;
|
|
int tok, orig_line_number, orig_token_size, orig_last_token, assignok;
|
|
char *saved_token, *ret;
|
|
|
|
saved_token = token;
|
|
orig_token_size = token_buffer_size;
|
|
orig_line_number = line_number;
|
|
orig_last_token = last_read_token;
|
|
|
|
last_read_token = WORD; /* WORD to allow reserved words here */
|
|
|
|
token = (char *)NULL;
|
|
token_buffer_size = 0;
|
|
|
|
assignok = parser_state&PST_ASSIGNOK; /* XXX */
|
|
|
|
wl = (WORD_LIST *)NULL; /* ( */
|
|
parser_state |= PST_COMPASSIGN;
|
|
|
|
while ((tok = read_token (READ)) != ')')
|
|
{
|
|
if (tok == '\n') /* Allow newlines in compound assignments */
|
|
{
|
|
if (SHOULD_PROMPT ())
|
|
prompt_again ();
|
|
continue;
|
|
}
|
|
if (tok != WORD && tok != ASSIGNMENT_WORD)
|
|
{
|
|
current_token = tok; /* for error reporting */
|
|
if (tok == yacc_EOF) /* ( */
|
|
parser_error (orig_line_number, _("unexpected EOF while looking for matching `)'"));
|
|
else
|
|
yyerror(NULL); /* does the right thing */
|
|
if (wl)
|
|
dispose_words (wl);
|
|
wl = &parse_string_error;
|
|
break;
|
|
}
|
|
wl = make_word_list (yylval.word, wl);
|
|
}
|
|
|
|
FREE (token);
|
|
token = saved_token;
|
|
token_buffer_size = orig_token_size;
|
|
|
|
parser_state &= ~PST_COMPASSIGN;
|
|
|
|
if (wl == &parse_string_error)
|
|
{
|
|
last_command_exit_value = EXECUTION_FAILURE;
|
|
last_read_token = '\n'; /* XXX */
|
|
if (interactive_shell == 0 && posixly_correct)
|
|
jump_to_top_level (FORCE_EOF);
|
|
else
|
|
jump_to_top_level (DISCARD);
|
|
}
|
|
|
|
last_read_token = orig_last_token; /* XXX - was WORD? */
|
|
|
|
if (wl)
|
|
{
|
|
rl = REVERSE_LIST (wl, WORD_LIST *);
|
|
ret = string_list (rl);
|
|
dispose_words (rl);
|
|
}
|
|
else
|
|
ret = (char *)NULL;
|
|
|
|
if (retlenp)
|
|
*retlenp = (ret && *ret) ? strlen (ret) : 0;
|
|
|
|
if (assignok)
|
|
parser_state |= PST_ASSIGNOK;
|
|
|
|
return ret;
|
|
}
|
|
|
|
/************************************************
|
|
* *
|
|
* SAVING AND RESTORING PARTIAL PARSE STATE *
|
|
* *
|
|
************************************************/
|
|
|
|
sh_parser_state_t *
|
|
save_parser_state (ps)
|
|
sh_parser_state_t *ps;
|
|
{
|
|
int i;
|
|
|
|
if (ps == 0)
|
|
ps = (sh_parser_state_t *)xmalloc (sizeof (sh_parser_state_t));
|
|
if (ps == 0)
|
|
return ((sh_parser_state_t *)NULL);
|
|
|
|
ps->parser_state = parser_state;
|
|
ps->token_state = save_token_state ();
|
|
|
|
ps->input_line_terminator = shell_input_line_terminator;
|
|
ps->eof_encountered = eof_encountered;
|
|
|
|
ps->prompt_string_pointer = prompt_string_pointer;
|
|
|
|
ps->current_command_line_count = current_command_line_count;
|
|
|
|
#if defined (HISTORY)
|
|
ps->remember_on_history = remember_on_history;
|
|
# if defined (BANG_HISTORY)
|
|
ps->history_expansion_inhibited = history_expansion_inhibited;
|
|
# endif
|
|
#endif
|
|
|
|
ps->last_command_exit_value = last_command_exit_value;
|
|
#if defined (ARRAY_VARS)
|
|
ps->pipestatus = save_pipestatus_array ();
|
|
#endif
|
|
|
|
ps->last_shell_builtin = last_shell_builtin;
|
|
ps->this_shell_builtin = this_shell_builtin;
|
|
|
|
ps->expand_aliases = expand_aliases;
|
|
ps->echo_input_at_read = echo_input_at_read;
|
|
ps->need_here_doc = need_here_doc;
|
|
ps->here_doc_first_line = here_doc_first_line;
|
|
|
|
#if 0
|
|
for (i = 0; i < HEREDOC_MAX; i++)
|
|
ps->redir_stack[i] = redir_stack[i];
|
|
#else
|
|
if (need_here_doc == 0)
|
|
ps->redir_stack[0] = 0;
|
|
else
|
|
memcpy (ps->redir_stack, redir_stack, sizeof (redir_stack[0]) * HEREDOC_MAX);
|
|
#endif
|
|
|
|
ps->token = token;
|
|
ps->token_buffer_size = token_buffer_size;
|
|
/* Force reallocation on next call to read_token_word */
|
|
token = 0;
|
|
token_buffer_size = 0;
|
|
|
|
return (ps);
|
|
}
|
|
|
|
void
|
|
restore_parser_state (ps)
|
|
sh_parser_state_t *ps;
|
|
{
|
|
int i;
|
|
|
|
if (ps == 0)
|
|
return;
|
|
|
|
parser_state = ps->parser_state;
|
|
if (ps->token_state)
|
|
{
|
|
restore_token_state (ps->token_state);
|
|
free (ps->token_state);
|
|
}
|
|
|
|
shell_input_line_terminator = ps->input_line_terminator;
|
|
eof_encountered = ps->eof_encountered;
|
|
|
|
prompt_string_pointer = ps->prompt_string_pointer;
|
|
|
|
current_command_line_count = ps->current_command_line_count;
|
|
|
|
#if defined (HISTORY)
|
|
remember_on_history = ps->remember_on_history;
|
|
# if defined (BANG_HISTORY)
|
|
history_expansion_inhibited = ps->history_expansion_inhibited;
|
|
# endif
|
|
#endif
|
|
|
|
last_command_exit_value = ps->last_command_exit_value;
|
|
#if defined (ARRAY_VARS)
|
|
restore_pipestatus_array (ps->pipestatus);
|
|
#endif
|
|
|
|
last_shell_builtin = ps->last_shell_builtin;
|
|
this_shell_builtin = ps->this_shell_builtin;
|
|
|
|
expand_aliases = ps->expand_aliases;
|
|
echo_input_at_read = ps->echo_input_at_read;
|
|
need_here_doc = ps->need_here_doc;
|
|
here_doc_first_line = ps->here_doc_first_line;
|
|
|
|
#if 0
|
|
for (i = 0; i < HEREDOC_MAX; i++)
|
|
redir_stack[i] = ps->redir_stack[i];
|
|
#else
|
|
if (need_here_doc == 0)
|
|
redir_stack[0] = 0;
|
|
else
|
|
memcpy (redir_stack, ps->redir_stack, sizeof (redir_stack[0]) * HEREDOC_MAX);
|
|
#endif
|
|
|
|
FREE (token);
|
|
token = ps->token;
|
|
token_buffer_size = ps->token_buffer_size;
|
|
}
|
|
|
|
sh_input_line_state_t *
|
|
save_input_line_state (ls)
|
|
sh_input_line_state_t *ls;
|
|
{
|
|
if (ls == 0)
|
|
ls = (sh_input_line_state_t *)xmalloc (sizeof (sh_input_line_state_t));
|
|
if (ls == 0)
|
|
return ((sh_input_line_state_t *)NULL);
|
|
|
|
ls->input_line = shell_input_line;
|
|
ls->input_line_size = shell_input_line_size;
|
|
ls->input_line_len = shell_input_line_len;
|
|
ls->input_line_index = shell_input_line_index;
|
|
|
|
/* force reallocation */
|
|
shell_input_line = 0;
|
|
shell_input_line_size = shell_input_line_len = shell_input_line_index = 0;
|
|
|
|
return ls;
|
|
}
|
|
|
|
void
|
|
restore_input_line_state (ls)
|
|
sh_input_line_state_t *ls;
|
|
{
|
|
FREE (shell_input_line);
|
|
shell_input_line = ls->input_line;
|
|
shell_input_line_size = ls->input_line_size;
|
|
shell_input_line_len = ls->input_line_len;
|
|
shell_input_line_index = ls->input_line_index;
|
|
|
|
set_line_mbstate ();
|
|
}
|
|
|
|
/************************************************
|
|
* *
|
|
* MULTIBYTE CHARACTER HANDLING *
|
|
* *
|
|
************************************************/
|
|
|
|
#if defined (HANDLE_MULTIBYTE)
|
|
static void
|
|
set_line_mbstate ()
|
|
{
|
|
int c;
|
|
size_t i, previ, len;
|
|
mbstate_t mbs, prevs;
|
|
size_t mbclen;
|
|
|
|
if (shell_input_line == NULL)
|
|
return;
|
|
len = strlen (shell_input_line); /* XXX - shell_input_line_len ? */
|
|
shell_input_line_property = (char *)xrealloc (shell_input_line_property, len + 1);
|
|
|
|
memset (&prevs, '\0', sizeof (mbstate_t));
|
|
for (i = previ = 0; i < len; i++)
|
|
{
|
|
mbs = prevs;
|
|
|
|
c = shell_input_line[i];
|
|
if (c == EOF)
|
|
{
|
|
size_t j;
|
|
for (j = i; j < len; j++)
|
|
shell_input_line_property[j] = 1;
|
|
break;
|
|
}
|
|
|
|
mbclen = mbrlen (shell_input_line + previ, i - previ + 1, &mbs);
|
|
if (mbclen == 1 || mbclen == (size_t)-1)
|
|
{
|
|
mbclen = 1;
|
|
previ = i + 1;
|
|
}
|
|
else if (mbclen == (size_t)-2)
|
|
mbclen = 0;
|
|
else if (mbclen > 1)
|
|
{
|
|
mbclen = 0;
|
|
previ = i + 1;
|
|
prevs = mbs;
|
|
}
|
|
else
|
|
{
|
|
/* XXX - what to do if mbrlen returns 0? (null wide character) */
|
|
size_t j;
|
|
for (j = i; j < len; j++)
|
|
shell_input_line_property[j] = 1;
|
|
break;
|
|
}
|
|
|
|
shell_input_line_property[i] = mbclen;
|
|
}
|
|
}
|
|
#endif /* HANDLE_MULTIBYTE */
|