Imported from ../bash-1.14.7.tar.gz.
This commit is contained in:
Jari Aalto
commit
726f63884d
402 changed files with 150297 additions and 0 deletions
528
builtins/set.def
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528
builtins/set.def
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@ -0,0 +1,528 @@
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This file is set.def, from which is created set.c.
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It implements the "set" and "unset" builtins in Bash.
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Copyright (C) 1987, 1989, 1991 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 it under
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the terms of the GNU General Public License as published by the Free
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||||
Software Foundation; either version 1, or (at your option) any later
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version.
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Bash is distributed in the hope that it will be useful, but WITHOUT ANY
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WARRANTY; without even the implied warranty of MERCHANTABILITY or
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FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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for more details.
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||||
You should have received a copy of the GNU General Public License along
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with Bash; see the file COPYING. If not, write to the Free Software
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Foundation, 675 Mass Ave, Cambridge, MA 02139, USA.
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$PRODUCES set.c
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#include <stdio.h>
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#include "../shell.h"
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#include "../flags.h"
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#include "bashgetopt.h"
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extern int interactive;
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extern int noclobber, no_brace_expansion, posixly_correct;
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#if defined (READLINE)
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extern int rl_editing_mode, no_line_editing;
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#endif /* READLINE */
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#define USAGE_STRING "set [--abefhknotuvxldHCP] [-o option] [arg ...]"
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$BUILTIN set
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$FUNCTION set_builtin
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$SHORT_DOC set [--abefhknotuvxldHCP] [-o option] [arg ...]
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-a Mark variables which are modified or created for export.
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-b Notify of job termination immediately.
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-e Exit immediately if a command exits with a non-zero status.
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-f Disable file name generation (globbing).
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-h Locate and remember function commands as functions are
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defined. Function commands are normally looked up when
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the function is executed.
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-i Force the shell to be an "interactive" one. Interactive shells
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always read `~/.bashrc' on startup.
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-k All keyword arguments are placed in the environment for a
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command, not just those that precede the command name.
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-m Job control is enabled.
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-n Read commands but do not execute them.
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-o option-name
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Set the variable corresponding to option-name:
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allexport same as -a
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braceexpand the shell will perform brace expansion
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#if defined (READLINE)
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emacs use an emacs-style line editing interface
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#endif /* READLINE */
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errexit same as -e
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#if defined (BANG_HISTORY)
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histexpand same as -H
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#endif /* BANG_HISTORY */
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ignoreeof the shell will not exit upon reading EOF
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interactive-comments
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allow comments to appear in interactive commands
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monitor same as -m
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noclobber disallow redirection to existing files
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noexec same as -n
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noglob same as -f
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nohash same as -d
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notify save as -b
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nounset same as -u
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physical same as -P
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posix change the behavior of bash where the default
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operation differs from the 1003.2 standard to
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match the standard
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privileged same as -p
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verbose same as -v
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#if defined (READLINE)
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vi use a vi-style line editing interface
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#endif /* READLINE */
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xtrace same as -x
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-p Turned on whenever the real and effective user ids do not match.
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Disables processing of the $ENV file and importing of shell
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functions. Turning this option off causes the effective uid and
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gid to be set to the real uid and gid.
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-t Exit after reading and executing one command.
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-u Treat unset variables as an error when substituting.
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-v Print shell input lines as they are read.
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-x Print commands and their arguments as they are executed.
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-l Save and restore the binding of the NAME in a FOR command.
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-d Disable the hashing of commands that are looked up for execution.
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Normally, commands are remembered in a hash table, and once
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found, do not have to be looked up again.
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#if defined (BANG_HISTORY)
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-H Enable ! style history substitution. This flag is on
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by default.
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#endif /* BANG_HISTORY */
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-C If set, disallow existing regular files to be overwritten
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by redirection of output.
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-P If set, do not follow symbolic links when executing commands
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such as cd which change the current directory.
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Using + rather than - causes these flags to be turned off. The
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flags can also be used upon invocation of the shell. The current
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set of flags may be found in $-. The remaining n ARGs are positional
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parameters and are assigned, in order, to $1, $2, .. $n. If no
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ARGs are given, all shell variables are printed.
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$END
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/* An a-list used to match long options for set -o to the corresponding
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option letter. */
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struct {
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char *name;
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int letter;
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} o_options[] = {
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{ "allexport", 'a' },
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{ "errexit", 'e' },
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#if defined (BANG_HISTORY)
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{ "histexpand", 'H' },
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#endif /* BANG_HISTORY */
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{ "monitor", 'm' },
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{ "noexec", 'n' },
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{ "noglob", 'f' },
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{ "nohash", 'd' },
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#if defined (JOB_CONTROL)
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{ "notify", 'b' },
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#endif /* JOB_CONTROL */
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{"nounset", 'u' },
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{"physical", 'P' },
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{"privileged", 'p' },
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{"verbose", 'v' },
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{"xtrace", 'x' },
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{(char *)NULL, 0},
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};
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#define MINUS_O_FORMAT "%-15s\t%s\n"
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void
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list_minus_o_opts ()
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{
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register int i;
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char *on = "on", *off = "off";
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printf (MINUS_O_FORMAT, "braceexpand", (no_brace_expansion == 0) ? on : off);
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printf (MINUS_O_FORMAT, "noclobber", (noclobber == 1) ? on : off);
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if (find_variable ("ignoreeof") || find_variable ("IGNOREEOF"))
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printf (MINUS_O_FORMAT, "ignoreeof", on);
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else
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printf (MINUS_O_FORMAT, "ignoreeof", off);
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printf (MINUS_O_FORMAT, "interactive-comments",
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interactive_comments ? on : off);
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printf (MINUS_O_FORMAT, "posix", posixly_correct ? on : off);
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#if defined (READLINE)
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if (no_line_editing)
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{
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printf (MINUS_O_FORMAT, "emacs", off);
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printf (MINUS_O_FORMAT, "vi", off);
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}
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else
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{
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/* Magic. This code `knows' how readline handles rl_editing_mode. */
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printf (MINUS_O_FORMAT, "emacs", (rl_editing_mode == 1) ? on : off);
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printf (MINUS_O_FORMAT, "vi", (rl_editing_mode == 0) ? on : off);
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}
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#endif /* READLINE */
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for (i = 0; o_options[i].name; i++)
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{
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int *on_or_off, zero = 0;
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on_or_off = find_flag (o_options[i].letter);
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if (on_or_off == FLAG_UNKNOWN)
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on_or_off = &zero;
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printf (MINUS_O_FORMAT, o_options[i].name, (*on_or_off == 1) ? on : off);
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}
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}
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set_minus_o_option (on_or_off, option_name)
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int on_or_off;
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char *option_name;
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{
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int option_char = -1;
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if (STREQ (option_name, "braceexpand"))
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{
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if (on_or_off == FLAG_ON)
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no_brace_expansion = 0;
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else
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no_brace_expansion = 1;
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}
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else if (STREQ (option_name, "noclobber"))
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{
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if (on_or_off == FLAG_ON)
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bind_variable ("noclobber", "");
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else
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unbind_variable ("noclobber");
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stupidly_hack_special_variables ("noclobber");
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}
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else if (STREQ (option_name, "ignoreeof"))
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{
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unbind_variable ("ignoreeof");
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unbind_variable ("IGNOREEOF");
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if (on_or_off == FLAG_ON)
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bind_variable ("IGNOREEOF", "10");
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stupidly_hack_special_variables ("IGNOREEOF");
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}
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#if defined (READLINE)
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else if ((STREQ (option_name, "emacs")) || (STREQ (option_name, "vi")))
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{
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if (on_or_off == FLAG_ON)
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{
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rl_variable_bind ("editing-mode", option_name);
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if (interactive)
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with_input_from_stdin ();
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no_line_editing = 0;
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}
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else
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{
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int isemacs = (rl_editing_mode == 1);
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if ((isemacs && STREQ (option_name, "emacs")) ||
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(!isemacs && STREQ (option_name, "vi")))
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{
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if (interactive)
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with_input_from_stream (stdin, "stdin");
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no_line_editing = 1;
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}
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else
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builtin_error ("not in %s editing mode", option_name);
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}
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}
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#endif /* READLINE */
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else if (STREQ (option_name, "interactive-comments"))
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interactive_comments = (on_or_off == FLAG_ON);
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else if (STREQ (option_name, "posix"))
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{
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posixly_correct = (on_or_off == FLAG_ON);
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unbind_variable ("POSIXLY_CORRECT");
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unbind_variable ("POSIX_PEDANTIC");
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if (on_or_off == FLAG_ON)
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{
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bind_variable ("POSIXLY_CORRECT", "");
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stupidly_hack_special_variables ("POSIXLY_CORRECT");
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}
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}
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else
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{
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register int i;
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for (i = 0; o_options[i].name; i++)
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{
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if (STREQ (option_name, o_options[i].name))
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{
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option_char = o_options[i].letter;
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break;
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}
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}
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if (option_char == -1)
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{
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builtin_error ("%s: unknown option name", option_name);
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return (EXECUTION_FAILURE);
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}
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if (change_flag (option_char, on_or_off) == FLAG_ERROR)
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{
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bad_option (option_name);
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return (EXECUTION_FAILURE);
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}
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}
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return (EXECUTION_SUCCESS);
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}
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/* Set some flags from the word values in the input list. If LIST is empty,
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then print out the values of the variables instead. If LIST contains
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non-flags, then set $1 - $9 to the successive words of LIST. */
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set_builtin (list)
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WORD_LIST *list;
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{
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int on_or_off, flag_name, force_assignment = 0;
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if (!list)
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{
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SHELL_VAR **vars;
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vars = all_shell_variables ();
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if (vars)
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{
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print_var_list (vars);
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free (vars);
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}
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vars = all_shell_functions ();
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if (vars)
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{
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print_var_list (vars);
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free (vars);
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}
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return (EXECUTION_SUCCESS);
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}
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|
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/* Check validity of flag arguments. */
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if (*list->word->word == '-' || *list->word->word == '+')
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{
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register char *arg;
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WORD_LIST *save_list = list;
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while (list && (arg = list->word->word))
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{
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char c;
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|
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if (arg[0] != '-' && arg[0] != '+')
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break;
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||||
|
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/* `-' or `--' signifies end of flag arguments. */
|
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if (arg[0] == '-' &&
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(!arg[1] || (arg[1] == '-' && !arg[2])))
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break;
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while (c = *++arg)
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{
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if (find_flag (c) == FLAG_UNKNOWN && c != 'o')
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{
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char s[2];
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s[0] = c; s[1] = '\0';
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bad_option (s);
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if (c == '?')
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printf ("usage: %s\n", USAGE_STRING);
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return (c == '?' ? EXECUTION_SUCCESS : EXECUTION_FAILURE);
|
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}
|
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}
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list = list->next;
|
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}
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list = save_list;
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}
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|
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/* Do the set command. While the list consists of words starting with
|
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'-' or '+' treat them as flags, otherwise, start assigning them to
|
||||
$1 ... $n. */
|
||||
while (list)
|
||||
{
|
||||
char *string = list->word->word;
|
||||
|
||||
/* If the argument is `--' or `-' then signal the end of the list
|
||||
and remember the remaining arguments. */
|
||||
if (string[0] == '-' && (!string[1] || (string[1] == '-' && !string[2])))
|
||||
{
|
||||
list = list->next;
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|
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/* `set --' unsets the positional parameters. */
|
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if (string[1] == '-')
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force_assignment = 1;
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|
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/* Until told differently, the old shell behaviour of
|
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`set - [arg ...]' being equivalent to `set +xv [arg ...]'
|
||||
stands. Posix.2 says the behaviour is marked as obsolescent. */
|
||||
else
|
||||
{
|
||||
change_flag ('x', '+');
|
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change_flag ('v', '+');
|
||||
}
|
||||
|
||||
break;
|
||||
}
|
||||
|
||||
if ((on_or_off = *string) &&
|
||||
(on_or_off == '-' || on_or_off == '+'))
|
||||
{
|
||||
int i = 1;
|
||||
while (flag_name = string[i++])
|
||||
{
|
||||
if (flag_name == '?')
|
||||
{
|
||||
printf ("usage: %s\n", USAGE_STRING);
|
||||
return (EXECUTION_SUCCESS);
|
||||
}
|
||||
else if (flag_name == 'o') /* -+o option-name */
|
||||
{
|
||||
char *option_name;
|
||||
WORD_LIST *opt;
|
||||
|
||||
opt = list->next;
|
||||
|
||||
if (!opt)
|
||||
{
|
||||
list_minus_o_opts ();
|
||||
continue;
|
||||
}
|
||||
|
||||
option_name = opt->word->word;
|
||||
|
||||
if (!option_name || !*option_name || (*option_name == '-'))
|
||||
{
|
||||
list_minus_o_opts ();
|
||||
continue;
|
||||
}
|
||||
list = list->next; /* Skip over option name. */
|
||||
|
||||
if (set_minus_o_option (on_or_off, option_name) != EXECUTION_SUCCESS)
|
||||
return (EXECUTION_FAILURE);
|
||||
}
|
||||
else
|
||||
{
|
||||
if (change_flag (flag_name, on_or_off) == FLAG_ERROR)
|
||||
{
|
||||
char opt[3];
|
||||
opt[0] = on_or_off;
|
||||
opt[1] = flag_name;
|
||||
opt[2] = '\0';
|
||||
bad_option (opt);
|
||||
return (EXECUTION_FAILURE);
|
||||
}
|
||||
}
|
||||
}
|
||||
}
|
||||
else
|
||||
{
|
||||
break;
|
||||
}
|
||||
list = list->next;
|
||||
}
|
||||
|
||||
/* Assigning $1 ... $n */
|
||||
if (list || force_assignment)
|
||||
remember_args (list, 1);
|
||||
return (EXECUTION_SUCCESS);
|
||||
}
|
||||
|
||||
$BUILTIN unset
|
||||
$FUNCTION unset_builtin
|
||||
$SHORT_DOC unset [-f] [-v] [name ...]
|
||||
For each NAME, remove the corresponding variable or function. Given
|
||||
the `-v', unset will only act on variables. Given the `-f' flag,
|
||||
unset will only act on functions. With neither flag, unset first
|
||||
tries to unset a variable, and if that fails, then tries to unset a
|
||||
function. Some variables (such as PATH and IFS) cannot be unset; also
|
||||
see readonly.
|
||||
$END
|
||||
|
||||
unset_builtin (list)
|
||||
WORD_LIST *list;
|
||||
{
|
||||
int unset_function = 0, unset_variable = 0, opt;
|
||||
int any_failed = 0;
|
||||
char *name;
|
||||
|
||||
reset_internal_getopt ();
|
||||
while ((opt = internal_getopt (list, "fv")) != -1)
|
||||
{
|
||||
switch (opt)
|
||||
{
|
||||
case 'f':
|
||||
unset_function = 1;
|
||||
break;
|
||||
case 'v':
|
||||
unset_variable = 1;
|
||||
break;
|
||||
default:
|
||||
return (EXECUTION_FAILURE);
|
||||
}
|
||||
}
|
||||
|
||||
list = loptend;
|
||||
|
||||
if (unset_function && unset_variable)
|
||||
{
|
||||
builtin_error ("cannot simultaneously unset a function and a variable");
|
||||
return (EXECUTION_FAILURE);
|
||||
}
|
||||
|
||||
while (list)
|
||||
{
|
||||
name = list->word->word;
|
||||
|
||||
if (!unset_function &&
|
||||
find_name_in_list (name, non_unsettable_vars) > -1)
|
||||
{
|
||||
builtin_error ("%s: cannot unset", name);
|
||||
any_failed++;
|
||||
}
|
||||
else
|
||||
{
|
||||
SHELL_VAR *var;
|
||||
int tem;
|
||||
|
||||
var = unset_function ? find_function (name) : find_variable (name);
|
||||
|
||||
/* Posix.2 says that unsetting readonly variables is an error. */
|
||||
if (var && readonly_p (var))
|
||||
{
|
||||
builtin_error ("%s: cannot unset: readonly %s",
|
||||
name, unset_function ? "function" : "variable");
|
||||
any_failed++;
|
||||
list = list->next;
|
||||
continue;
|
||||
}
|
||||
|
||||
/* Unless the -f option is supplied, the name refers to a
|
||||
variable. */
|
||||
tem = makunbound
|
||||
(name, unset_function ? shell_functions : shell_variables);
|
||||
|
||||
/* This is what Posix.2 draft 11+ says. ``If neither -f nor -v
|
||||
is specified, the name refers to a variable; if a variable by
|
||||
that name does not exist, a function by that name, if any,
|
||||
shall be unset.'' */
|
||||
if ((tem == -1) && !unset_function && !unset_variable)
|
||||
tem = makunbound (name, shell_functions);
|
||||
|
||||
if (tem == -1)
|
||||
any_failed++;
|
||||
else if (!unset_function)
|
||||
stupidly_hack_special_variables (name);
|
||||
}
|
||||
list = list->next;
|
||||
}
|
||||
|
||||
if (any_failed)
|
||||
return (EXECUTION_FAILURE);
|
||||
else
|
||||
return (EXECUTION_SUCCESS);
|
||||
}
|
||||
Loading…
Add table
Add a link
Reference in a new issue