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glibc/stdlib/rpmatch.c
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/* 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) 1996-2016 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 | |
<http://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)); | |
} |