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62 lines
2.0 KiB
C
62 lines
2.0 KiB
C
/* Determine whether string value is affirmation or negative response
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according to current locale's data.
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This file is part of the GNU C Library.
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Copyright (C) 1996-2017 Free Software Foundation, Inc.
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The GNU C Library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Lesser General Public
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License as published by the Free Software Foundation; either
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version 2.1 of the License, or (at your option) any later version.
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The GNU C Library is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public
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License along with the GNU C Library; if not, see
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<http://www.gnu.org/licenses/>. */
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#include <langinfo.h>
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#include <stdlib.h>
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#include <regex.h>
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/* Match against one of the response patterns, compiling the pattern
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first if necessary. */
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static int
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try (const char *response,
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const int tag, const int match, const int nomatch,
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const char **lastp, regex_t *re)
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{
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const char *pattern = nl_langinfo (tag);
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if (pattern != *lastp)
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{
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/* The pattern has changed. */
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if (*lastp != NULL)
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{
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/* Free the old compiled pattern. */
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__regfree (re);
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*lastp = NULL;
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}
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/* Compile the pattern and cache it for future runs. */
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if (__regcomp (re, pattern, REG_EXTENDED) != 0)
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return -1;
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*lastp = pattern;
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}
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/* Try the pattern. */
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return __regexec (re, response, 0, NULL, 0) == 0 ? match : nomatch;
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}
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int
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rpmatch (const char *response)
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{
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/* We cache the response patterns and compiled regexps here. */
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static const char *yesexpr, *noexpr;
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static regex_t yesre, nore;
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return (try (response, YESEXPR, 1, 0, &yesexpr, &yesre) ?:
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try (response, NOEXPR, 0, -1, &noexpr, &nore));
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}
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