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7cc27f44 UD |
1 | /* Determine whether string value is affirmation or negative response |
2 | according to current locale's data. | |
3 | This file is part of the GNU C Library. | |
d614a753 | 4 | Copyright (C) 1996-2020 Free Software Foundation, Inc. |
857fa1b8 | 5 | |
7cc27f44 | 6 | The GNU C Library is free software; you can redistribute it and/or |
41bdb6e2 AJ |
7 | modify it under the terms of the GNU Lesser General Public |
8 | License as published by the Free Software Foundation; either | |
9 | version 2.1 of the License, or (at your option) any later version. | |
857fa1b8 | 10 | |
7cc27f44 UD |
11 | The GNU C Library is distributed in the hope that it will be useful, |
12 | but WITHOUT ANY WARRANTY; without even the implied warranty of | |
13 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
41bdb6e2 | 14 | Lesser General Public License for more details. |
857fa1b8 | 15 | |
41bdb6e2 | 16 | You should have received a copy of the GNU Lesser General Public |
59ba27a6 | 17 | License along with the GNU C Library; if not, see |
5a82c748 | 18 | <https://www.gnu.org/licenses/>. */ |
857fa1b8 RM |
19 | |
20 | #include <langinfo.h> | |
21 | #include <stdlib.h> | |
22 | #include <regex.h> | |
23 | ||
24 | ||
c079afb7 RM |
25 | /* Match against one of the response patterns, compiling the pattern |
26 | first if necessary. */ | |
27 | static int | |
28 | try (const char *response, | |
29 | const int tag, const int match, const int nomatch, | |
30 | const char **lastp, regex_t *re) | |
857fa1b8 | 31 | { |
c079afb7 RM |
32 | const char *pattern = nl_langinfo (tag); |
33 | if (pattern != *lastp) | |
857fa1b8 | 34 | { |
c079afb7 RM |
35 | /* The pattern has changed. */ |
36 | if (*lastp != NULL) | |
37 | { | |
38 | /* Free the old compiled pattern. */ | |
39 | __regfree (re); | |
40 | *lastp = NULL; | |
41 | } | |
42 | /* Compile the pattern and cache it for future runs. */ | |
43 | if (__regcomp (re, pattern, REG_EXTENDED) != 0) | |
44 | return -1; | |
45 | *lastp = pattern; | |
857fa1b8 RM |
46 | } |
47 | ||
c079afb7 RM |
48 | /* Try the pattern. */ |
49 | return __regexec (re, response, 0, NULL, 0) == 0 ? match : nomatch; | |
50 | } | |
51 | ||
52 | int | |
53 | rpmatch (const char *response) | |
54 | { | |
857fa1b8 RM |
55 | /* We cache the response patterns and compiled regexps here. */ |
56 | static const char *yesexpr, *noexpr; | |
57 | static regex_t yesre, nore; | |
58 | ||
c079afb7 RM |
59 | return (try (response, YESEXPR, 1, 0, &yesexpr, &yesre) ?: |
60 | try (response, NOEXPR, 0, -1, &noexpr, &nore)); | |
857fa1b8 | 61 | } |