132 lines
3.2 KiB
Modula-2
132 lines
3.2 KiB
Modula-2
This file is break.def, from which is created break.c.
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It implements the builtins "break" and "continue" in Bash.
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Copyright (C) 1987-2003 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 2, 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, 59 Temple Place, Suite 330, Boston, MA 02111 USA.
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$PRODUCES break.c
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$BUILTIN break
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$FUNCTION break_builtin
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$SHORT_DOC break [n]
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Exit from within a FOR, WHILE or UNTIL loop. If N is specified,
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break N levels.
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$END
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#include <config.h>
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#if defined (HAVE_UNISTD_H)
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# ifdef _MINIX
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# include <sys/types.h>
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# endif
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# include <unistd.h>
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#endif
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#include "../bashintl.h"
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#include "../shell.h"
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#include "common.h"
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extern char *this_command_name;
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extern int posixly_correct;
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static int check_loop_level __P((void));
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/* The depth of while's and until's. */
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int loop_level = 0;
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/* Non-zero when a "break" instruction is encountered. */
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int breaking = 0;
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/* Non-zero when we have encountered a continue instruction. */
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int continuing = 0;
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/* Set up to break x levels, where x defaults to 1, but can be specified
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as the first argument. */
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int
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break_builtin (list)
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WORD_LIST *list;
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{
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intmax_t newbreak;
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if (check_loop_level () == 0)
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return (EXECUTION_SUCCESS);
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newbreak = get_numeric_arg (list, 1);
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if (newbreak <= 0)
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{
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sh_erange (list->word->word, "loop count");
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breaking = loop_level;
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return (EXECUTION_FAILURE);
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}
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if (newbreak > loop_level)
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newbreak = loop_level;
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breaking = newbreak;
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return (EXECUTION_SUCCESS);
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}
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$BUILTIN continue
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$FUNCTION continue_builtin
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$SHORT_DOC continue [n]
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Resume the next iteration of the enclosing FOR, WHILE or UNTIL loop.
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If N is specified, resume at the N-th enclosing loop.
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$END
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/* Set up to continue x levels, where x defaults to 1, but can be specified
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as the first argument. */
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int
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continue_builtin (list)
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WORD_LIST *list;
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{
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intmax_t newcont;
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if (check_loop_level () == 0)
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return (EXECUTION_SUCCESS);
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newcont = get_numeric_arg (list, 1);
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if (newcont <= 0)
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{
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sh_erange (list->word->word, "loop count");
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breaking = loop_level;
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return (EXECUTION_FAILURE);
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}
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if (newcont > loop_level)
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newcont = loop_level;
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continuing = newcont;
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return (EXECUTION_SUCCESS);
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}
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/* Return non-zero if a break or continue command would be okay.
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Print an error message if break or continue is meaningless here. */
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static int
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check_loop_level ()
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{
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#if defined (BREAK_COMPLAINS)
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if (loop_level == 0 && posixly_correct == 0)
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builtin_error (_("only meaningful in a `for', `while', or `until' loop"));
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#endif /* BREAK_COMPLAINS */
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return (loop_level);
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}
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