62 lines
2.0 KiB
C
62 lines
2.0 KiB
C
/* Determine whether string value is affirmation or negative response
|
|
according to current locale's data.
|
|
This file is part of the GNU C Library.
|
|
Copyright (C) 1996-2022 Free Software Foundation, Inc.
|
|
|
|
The GNU C Library is free software; you can redistribute it and/or
|
|
modify it under the terms of the GNU Lesser General Public
|
|
License as published by the Free Software Foundation; either
|
|
version 2.1 of the License, or (at your option) any later version.
|
|
|
|
The GNU C Library 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
|
|
Lesser General Public License for more details.
|
|
|
|
You should have received a copy of the GNU Lesser General Public
|
|
License along with the GNU C Library; if not, see
|
|
<https://www.gnu.org/licenses/>. */
|
|
|
|
#include <langinfo.h>
|
|
#include <stdlib.h>
|
|
#include <regex.h>
|
|
|
|
|
|
/* Match against one of the response patterns, compiling the pattern
|
|
first if necessary. */
|
|
static int
|
|
try (const char *response,
|
|
const int tag, const int match, const int nomatch,
|
|
const char **lastp, regex_t *re)
|
|
{
|
|
const char *pattern = nl_langinfo (tag);
|
|
if (pattern != *lastp)
|
|
{
|
|
/* The pattern has changed. */
|
|
if (*lastp != NULL)
|
|
{
|
|
/* Free the old compiled pattern. */
|
|
__regfree (re);
|
|
*lastp = NULL;
|
|
}
|
|
/* Compile the pattern and cache it for future runs. */
|
|
if (__regcomp (re, pattern, REG_EXTENDED) != 0)
|
|
return -1;
|
|
*lastp = pattern;
|
|
}
|
|
|
|
/* Try the pattern. */
|
|
return __regexec (re, response, 0, NULL, 0) == 0 ? match : nomatch;
|
|
}
|
|
|
|
int
|
|
rpmatch (const char *response)
|
|
{
|
|
/* We cache the response patterns and compiled regexps here. */
|
|
static const char *yesexpr, *noexpr;
|
|
static regex_t yesre, nore;
|
|
|
|
return (try (response, YESEXPR, 1, 0, &yesexpr, &yesre) ?:
|
|
try (response, NOEXPR, 0, -1, &noexpr, &nore));
|
|
}
|