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This file is break.def, from which is created break.c.
It implements the builtins "break" and "continue" in Bash.
Copyright (C) 1987-2009 Free Software Foundation, Inc.
This file is part of GNU Bash, the Bourne Again SHell.
Bash is free software: you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation, either version 3 of the License, or
(at your option) any later version.
Bash is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with Bash. If not, see <http://www.gnu.org/licenses/>.
$PRODUCES break.c
$BUILTIN break
$FUNCTION break_builtin
$SHORT_DOC break [n]
Exit for, while, or until loops.
Exit a FOR, WHILE or UNTIL loop. If N is specified, break N enclosing
loops.
Exit Status:
The exit status is 0 unless N is not greater than or equal to 1.
$END
#include <config.h>
#if defined (HAVE_UNISTD_H)
# ifdef _MINIX
# include <sys/types.h>
# endif
# include <unistd.h>
#endif
#include "../bashintl.h"
#include "../shell.h"
#include "common.h"
extern char *this_command_name;
extern int posixly_correct;
static int check_loop_level __P((void));
/* The depth of while's and until's. */
int loop_level = 0;
/* Non-zero when a "break" instruction is encountered. */
int breaking = 0;
/* Non-zero when we have encountered a continue instruction. */
int continuing = 0;
/* Set up to break x levels, where x defaults to 1, but can be specified
as the first argument. */
int
break_builtin (list)
WORD_LIST *list;
{
intmax_t newbreak;
if (check_loop_level () == 0)
return (EXECUTION_SUCCESS);
(void)get_numeric_arg (list, 1, &newbreak);
if (newbreak <= 0)
{
sh_erange (list->word->word, _("loop count"));
breaking = loop_level;
return (EXECUTION_FAILURE);
}
if (newbreak > loop_level)
newbreak = loop_level;
breaking = newbreak;
return (EXECUTION_SUCCESS);
}
$BUILTIN continue
$FUNCTION continue_builtin
$SHORT_DOC continue [n]
Resume for, while, or until loops.
Resumes the next iteration of the enclosing FOR, WHILE or UNTIL loop.
If N is specified, resumes the Nth enclosing loop.
Exit Status:
The exit status is 0 unless N is not greater than or equal to 1.
$END
/* Set up to continue x levels, where x defaults to 1, but can be specified
as the first argument. */
int
continue_builtin (list)
WORD_LIST *list;
{
intmax_t newcont;
if (check_loop_level () == 0)
return (EXECUTION_SUCCESS);
(void)get_numeric_arg (list, 1, &newcont);
if (newcont <= 0)
{
sh_erange (list->word->word, _("loop count"));
breaking = loop_level;
return (EXECUTION_FAILURE);
}
if (newcont > loop_level)
newcont = loop_level;
continuing = newcont;
return (EXECUTION_SUCCESS);
}
/* Return non-zero if a break or continue command would be okay.
Print an error message if break or continue is meaningless here. */
static int
check_loop_level ()
{
#if defined (BREAK_COMPLAINS)
if (loop_level == 0 && posixly_correct == 0)
builtin_error (_("only meaningful in a `for', `while', or `until' loop"));
#endif /* BREAK_COMPLAINS */
return (loop_level);
}
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