| /* Determine whether string value is affirmation or negative response |
| according to current locale's data. |
| This file is part of the GNU C Library. |
| Copyright (C) 1996-2018 Free Software Foundation, Inc. |
| |
| The GNU C Library is free software; you can redistribute it and/or |
| modify it under the terms of the GNU Lesser General Public |
| License as published by the Free Software Foundation; either |
| version 2.1 of the License, or (at your option) any later version. |
| |
| The GNU C Library is distributed in the hope that it will be useful, |
| but WITHOUT ANY WARRANTY; without even the implied warranty of |
| MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
| Lesser General Public License for more details. |
| |
| You should have received a copy of the GNU Lesser General Public |
| License along with the GNU C Library; if not, see |
| <http://www.gnu.org/licenses/>. */ |
| |
| #include <langinfo.h> |
| #include <stdlib.h> |
| #include <regex.h> |
| |
| |
| /* Match against one of the response patterns, compiling the pattern |
| first if necessary. */ |
| static int |
| try (const char *response, |
| const int tag, const int match, const int nomatch, |
| const char **lastp, regex_t *re) |
| { |
| const char *pattern = nl_langinfo (tag); |
| if (pattern != *lastp) |
| { |
| /* The pattern has changed. */ |
| if (*lastp != NULL) |
| { |
| /* Free the old compiled pattern. */ |
| __regfree (re); |
| *lastp = NULL; |
| } |
| /* Compile the pattern and cache it for future runs. */ |
| if (__regcomp (re, pattern, REG_EXTENDED) != 0) |
| return -1; |
| *lastp = pattern; |
| } |
| |
| /* Try the pattern. */ |
| return __regexec (re, response, 0, NULL, 0) == 0 ? match : nomatch; |
| } |
| |
| int |
| rpmatch (const char *response) |
| { |
| /* We cache the response patterns and compiled regexps here. */ |
| static const char *yesexpr, *noexpr; |
| static regex_t yesre, nore; |
| |
| return (try (response, YESEXPR, 1, 0, &yesexpr, &yesre) ?: |
| try (response, NOEXPR, 0, -1, &noexpr, &nore)); |
| } |