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80 lines
2.3 KiB
C
80 lines
2.3 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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Copyright (C) 1996, 1998, 2000, 2002, 2003 Free Software Foundation, Inc.
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This program is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 2, or (at your option)
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any later version.
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This program 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
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program; if not, write to the Free Software Foundation,
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Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA. */
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#if HAVE_CONFIG_H
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# include <config.h>
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#endif
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#include <stddef.h>
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#include <stdlib.h>
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#if ENABLE_NLS
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# include <sys/types.h>
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# include <limits.h>
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# include <regex.h>
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# include "gettext.h"
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# define _(msgid) gettext (msgid)
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static int
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try (const char *response, const char *pattern, const int match,
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const int nomatch, const char **lastp, regex_t *re)
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{
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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)
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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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/* See if the regular expression matches RESPONSE. */
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return regexec (re, response, 0, NULL, 0) == 0 ? match : nomatch;
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}
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#endif
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int
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rpmatch (const char *response)
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{
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#if ENABLE_NLS
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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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/* 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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int result;
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return ((result = try (response, _("^[yY]"), 1, 0,
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&yesexpr, &yesre))
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? result
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: try (response, _("^[nN]"), 0, -1, &noexpr, &nore));
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#else
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/* Test against "^[yY]" and "^[nN]", hardcoded to avoid requiring regex */
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return (*response == 'y' || *response == 'Y' ? 1
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: *response == 'n' || *response == 'N' ? 0 : -1);
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#endif
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}
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