1 /* Determine whether string value is affirmation or negative response
2 according to current locale's data.
3 Copyright (C) 1996, 1998, 2000, 2002, 2003 Free Software Foundation, Inc.
4
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)
8 any later version.
9
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.
14
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., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA. */
18 #include <sys/cdefs.h>
19 __RCSID("$NetBSD: rpmatch.c,v 1.2 2016/05/17 14:00:09 christos Exp $");
20
21
22 #ifdef HAVE_CONFIG_H
23 # include <config.h>
24 #endif
25
26 #include <stddef.h>
27 #include <stdlib.h>
28
29 #if ENABLE_NLS
30 # include <sys/types.h>
31 # include <limits.h>
32 # include <regex.h>
33 # include "gettext.h"
34 # define _(msgid) gettext (msgid)
35
36 static int
try(const char * response,const char * pattern,const int match,const int nomatch,const char ** lastp,regex_t * re)37 try (const char *response, const char *pattern, const int match,
38 const int nomatch, const char **lastp, regex_t *re)
39 {
40 if (pattern != *lastp)
41 {
42 /* The pattern has changed. */
43 if (*lastp)
44 {
45 /* Free the old compiled pattern. */
46 regfree (re);
47 *lastp = NULL;
48 }
49 /* Compile the pattern and cache it for future runs. */
50 if (regcomp (re, pattern, REG_EXTENDED) != 0)
51 return -1;
52 *lastp = pattern;
53 }
54
55 /* See if the regular expression matches RESPONSE. */
56 return regexec (re, response, 0, NULL, 0) == 0 ? match : nomatch;
57 }
58 #endif
59
60
61 int
rpmatch(const char * response)62 rpmatch (const char *response)
63 {
64 #if ENABLE_NLS
65 /* Match against one of the response patterns, compiling the pattern
66 first if necessary. */
67
68 /* We cache the response patterns and compiled regexps here. */
69 static const char *yesexpr, *noexpr;
70 static regex_t yesre, nore;
71 int result;
72
73 return ((result = try (response, _("^[yY]"), 1, 0,
74 &yesexpr, &yesre))
75 ? result
76 : try (response, _("^[nN]"), 0, -1, &noexpr, &nore));
77 #else
78 /* Test against "^[yY]" and "^[nN]", hardcoded to avoid requiring regex */
79 return (*response == 'y' || *response == 'Y' ? 1
80 : *response == 'n' || *response == 'N' ? 0 : -1);
81 #endif
82 }
83