| 1 | /* Determine whether string value is affirmation or negative response
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| 2 | according to current locale's data.
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| 3 |
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| 4 | Copyright (C) 1996, 1998, 2000, 2002, 2003, 2006 Free Software
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| 5 | Foundation, Inc.
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| 6 |
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| 7 | This program is free software; you can redistribute it and/or modify
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| 8 | it under the terms of the GNU General Public License as published by
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| 9 | the Free Software Foundation; either version 2, or (at your option)
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| 10 | any later version.
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| 11 |
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| 12 | This program is distributed in the hope that it will be useful,
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| 13 | but WITHOUT ANY WARRANTY; without even the implied warranty of
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| 14 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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| 15 | GNU General Public License for more details.
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| 16 |
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| 17 | You should have received a copy of the GNU General Public License
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| 18 | along with this program; if not, write to the Free Software Foundation,
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| 19 | Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA. */
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| 20 |
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| 21 | #include <config.h>
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| 22 |
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| 23 | #include <stddef.h>
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| 24 | #include <stdlib.h>
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| 25 |
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| 26 | #if ENABLE_NLS
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| 27 | # include <sys/types.h>
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| 28 | # include <limits.h>
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| 29 | # include <regex.h>
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| 30 | # include "gettext.h"
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| 31 | # define _(msgid) gettext (msgid)
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| 32 |
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| 33 | static int
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| 34 | try (const char *response, const char *pattern, const int match,
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| 35 | const int nomatch, const char **lastp, regex_t *re)
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| 36 | {
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| 37 | if (pattern != *lastp)
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| 38 | {
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| 39 | /* The pattern has changed. */
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| 40 | if (*lastp)
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| 41 | {
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| 42 | /* Free the old compiled pattern. */
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| 43 | regfree (re);
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| 44 | *lastp = NULL;
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| 45 | }
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| 46 | /* Compile the pattern and cache it for future runs. */
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| 47 | if (regcomp (re, pattern, REG_EXTENDED) != 0)
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| 48 | return -1;
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| 49 | *lastp = pattern;
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| 50 | }
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| 51 |
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| 52 | /* See if the regular expression matches RESPONSE. */
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| 53 | return regexec (re, response, 0, NULL, 0) == 0 ? match : nomatch;
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| 54 | }
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| 55 | #endif
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| 56 |
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| 57 |
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| 58 | int
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| 59 | rpmatch (const char *response)
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| 60 | {
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| 61 | #if ENABLE_NLS
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| 62 | /* Match against one of the response patterns, compiling the pattern
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| 63 | first if necessary. */
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| 64 |
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| 65 | /* We cache the response patterns and compiled regexps here. */
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| 66 | static const char *yesexpr, *noexpr;
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| 67 | static regex_t yesre, nore;
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| 68 | int result;
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| 69 |
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| 70 | return ((result = try (response, _("^[yY]"), 1, 0,
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| 71 | &yesexpr, &yesre))
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| 72 | ? result
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| 73 | : try (response, _("^[nN]"), 0, -1, &noexpr, &nore));
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| 74 | #else
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| 75 | /* Test against "^[yY]" and "^[nN]", hardcoded to avoid requiring regex */
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| 76 | return (*response == 'y' || *response == 'Y' ? 1
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| 77 | : *response == 'n' || *response == 'N' ? 0 : -1);
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| 78 | #endif
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| 79 | }
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