1 /* Determine whether string value is affirmation or negative response
2 according to current locale's data.
3 Copyright (C) 1996, 1998 Free Software Foundation, Inc.
5 This program is free software; you can redistribute it and/or modify
6 it under the terms of the GNU General Public License as published by
7 the Free Software Foundation; either version 2, or (at your option)
10 This program is distributed in the hope that it will be useful,
11 but WITHOUT ANY WARRANTY; without even the implied warranty of
12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
13 GNU General Public License for more details.
15 You should have received a copy of the GNU General Public License
16 along with this program; if not, write to the Free Software Foundation,
17 Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. */
23 #if STDC_HEADERS || _LIBC
33 # include <sys/types.h>
36 # define _(Text) gettext (Text)
39 try (const char *response, const char *pattern, const int match,
40 const int nomatch, const char **lastp, regex_t *re)
42 if (pattern != *lastp)
44 /* The pattern has changed. */
47 /* Free the old compiled pattern. */
51 /* Compile the pattern and cache it for future runs. */
52 if (regcomp (re, pattern, REG_EXTENDED) != 0)
57 /* See if the regular expression matches RESPONSE. */
58 return regexec (re, response, 0, NULL, 0) == 0 ? match : nomatch;
64 rpmatch (const char *response)
67 /* Match against one of the response patterns, compiling the pattern
68 first if necessary. */
70 /* We cache the response patterns and compiled regexps here. */
71 static const char *yesexpr, *noexpr;
72 static regex_t yesre, nore;
75 return ((result = try (response, _("^[yY]"), 1, 0,
78 : try (response, _("^[nN]"), 0, -1, &noexpr, &nore));
80 /* Test against "^[yY]" and "^[nN]", hardcoded to avoid requiring regex */
81 return (*response == 'y' || *response == 'Y' ? 1
82 : *response == 'n' || *response == 'N' ? 0 : -1);