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/*
* shmatch.c -- shell interface to posix regular expression matching.
*/
/* Copyright (C) 2003-2022 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/>.
*/
#ifdef HAVE_CONFIG_H
# include <config.h>
#endif
#if defined (HAVE_POSIX_REGEXP)
#ifdef HAVE_UNISTD_H
# include <unistd.h>
#endif
#include "bashansi.h"
#include <stdio.h>
#include <regex.h>
#include "shell.h"
#include "variables.h"
#include "externs.h"
extern int match_ignore_case;
#if defined (ARRAY_VARS)
extern SHELL_VAR *builtin_find_indexed_array (char *, int);
#endif
static char *
strregerror (int err, const regex_t *regex_p)
{
char *str;
size_t size;
size = regerror (err, regex_p, (char *)0, 0);
str = xmalloc (size);
(void)regerror (err, regex_p, str, size);
return str;
}
int
sh_regmatch (const char *string, const char *pattern, int flags, char **errbuf)
{
regex_t regex = { 0 };
regmatch_t *matches;
int rflags, reg_err;
#if defined (ARRAY_VARS)
SHELL_VAR *rematch;
ARRAY *amatch;
size_t subexp_ind, subexp_len;
char *subexp_str;
#endif
int result;
#if defined (ARRAY_VARS)
rematch = (SHELL_VAR *)NULL;
#endif
rflags = REG_EXTENDED;
if (match_ignore_case)
rflags |= REG_ICASE;
#if !defined (ARRAY_VARS)
rflags |= REG_NOSUB;
#endif
if (reg_err = regcomp (®ex, pattern, rflags))
{
if (errbuf)
*errbuf = strregerror (reg_err, ®ex);
return 2; /* flag for printing a warning here. */
}
#if defined (ARRAY_VARS)
matches = (regmatch_t *)malloc (sizeof (regmatch_t) * (regex.re_nsub + 1));
#else
matches = NULL;
#endif
/* man regexec: NULL PMATCH ignored if NMATCH == 0 */
if (regexec (®ex, string, matches ? regex.re_nsub + 1 : 0, matches, 0))
/* XXX - catch errors and fill in *errbuf here? */
result = EXECUTION_FAILURE;
else
result = EXECUTION_SUCCESS; /* match */
#if defined (ARRAY_VARS)
subexp_len = strlen (string) + 10;
subexp_str = malloc (subexp_len + 1);
/* Store the parenthesized subexpressions in the array BASH_REMATCH.
Element 0 is the portion that matched the entire regexp. Element 1
is the part that matched the first subexpression, and so on. */
#if 0
/* This was the pre-bash-5.3 code. */
unbind_global_variable_noref ("BASH_REMATCH");
rematch = make_new_array_variable ("BASH_REMATCH");
#else
rematch = builtin_find_indexed_array ("BASH_REMATCH", 1);
#endif
amatch = rematch ? array_cell (rematch) : (ARRAY *)0;
if (matches && amatch && (flags & SHMAT_SUBEXP) && result == EXECUTION_SUCCESS && subexp_str)
{
for (subexp_ind = 0; subexp_ind <= regex.re_nsub; subexp_ind++)
{
memset (subexp_str, 0, subexp_len);
strncpy (subexp_str, string + matches[subexp_ind].rm_so,
matches[subexp_ind].rm_eo - matches[subexp_ind].rm_so);
array_insert (amatch, subexp_ind, subexp_str);
}
}
#if 0
VSETATTR (rematch, att_readonly);
#endif
free (subexp_str);
free (matches);
#endif /* ARRAY_VARS */
regfree (®ex);
return result;
}
#endif /* HAVE_POSIX_REGEXP */
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