+++ /dev/null
-/* Determine whether string value is affirmation or negative response
- according to current locale's data.
-
- Copyright (C) 1996, 1998, 2000, 2002, 2003, 2006-2008 Free Software
- Foundation, Inc.
-
- This program is free software: you can redistribute it and/or modify
- it under the terms of the GNU General Public License as published by
- the Free Software Foundation; either version 3 of the License, or
- (at your option) any later version.
-
- This program 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 General Public License for more details.
-
- You should have received a copy of the GNU General Public License
- along with this program. If not, see <http://www.gnu.org/licenses/>. */
-
-#include <config.h>
-
-/* Specification. */
-#include <stdlib.h>
-
-#include <stdbool.h>
-#include <stddef.h>
-
-#if ENABLE_NLS
-# include <sys/types.h>
-# include <limits.h>
-# include <string.h>
-# if HAVE_LANGINFO_YESEXPR
-# include <langinfo.h>
-# endif
-# include <regex.h>
-# include "gettext.h"
-# define _(msgid) gettext (msgid)
-# define N_(msgid) gettext_noop (msgid)
-
-# if HAVE_LANGINFO_YESEXPR
-/* Return the localized regular expression pattern corresponding to
- ENGLISH_PATTERN. NL_INDEX can be used with nl_langinfo.
- The resulting string may only be used until the next nl_langinfo call. */
-static const char *
-localized_pattern (const char *english_pattern, nl_item nl_index,
- bool posixly_correct)
-{
- const char *translated_pattern;
-
- /* We prefer to get the patterns from a PO file. It would be possible to
- always use nl_langinfo (YESEXPR) instead of _("^[yY]"), and
- nl_langinfo (NOEXPR) instead of _("^[nN]"), if we could assume that the
- system's locale support is good. But this is not the case e.g. on Cygwin.
- The localizations of gnulib.pot are of better quality in general.
- Also, if we use locale info from non-free systems that don't have a
- 'localedef' command, we deprive the users of the freedom to localize
- this pattern for their preferred language.
- But some programs, such as 'cp', 'mv', 'rm', 'find', 'xargs', are
- specified by POSIX to use nl_langinfo (YESEXPR). We implement this
- behaviour if POSIXLY_CORRECT is set, for the sake of these programs. */
-
- /* If the user wants strict POSIX compliance, use nl_langinfo. */
- if (posixly_correct)
- {
- translated_pattern = nl_langinfo (nl_index);
- /* Check against a broken system return value. */
- if (translated_pattern != NULL && translated_pattern[0] != '\0')
- return translated_pattern;
- }
-
- /* Look in the gnulib message catalog. */
- translated_pattern = _(english_pattern);
- if (translated_pattern == english_pattern)
- {
- /* The gnulib message catalog provides no translation.
- Try the system's message catalog. */
- translated_pattern = nl_langinfo (nl_index);
- /* Check against a broken system return value. */
- if (translated_pattern != NULL && translated_pattern[0] != '\0')
- return translated_pattern;
- /* Fall back to English. */
- translated_pattern = english_pattern;
- }
- return translated_pattern;
-}
-# else
-# define localized_pattern(english_pattern,nl_index,posixly_correct) \
- _(english_pattern)
-# endif
-
-static int
-try (const char *response, const char *pattern, char **lastp, regex_t *re)
-{
- if (*lastp == NULL || strcmp (pattern, *lastp) != 0)
- {
- char *safe_pattern;
-
- /* The pattern has changed. */
- if (*lastp != NULL)
- {
- /* Free the old compiled pattern. */
- regfree (re);
- free (*lastp);
- *lastp = NULL;
- }
- /* Put the PATTERN into safe memory before calling regcomp.
- (regcomp may call nl_langinfo, overwriting PATTERN's storage. */
- safe_pattern = strdup (pattern);
- if (safe_pattern == NULL)
- return -1;
- /* Compile the pattern and cache it for future runs. */
- if (regcomp (re, safe_pattern, REG_EXTENDED) != 0)
- return -1;
- *lastp = safe_pattern;
- }
-
- /* See if the regular expression matches RESPONSE. */
- return regexec (re, response, 0, NULL, 0) == 0;
-}
-#endif
-
-
-int
-rpmatch (const char *response)
-{
-#if ENABLE_NLS
- /* Match against one of the response patterns, compiling the pattern
- first if necessary. */
-
- /* We cache the response patterns and compiled regexps here. */
- static char *last_yesexpr, *last_noexpr;
- static regex_t cached_yesre, cached_nore;
-
-# if HAVE_LANGINFO_YESEXPR
- bool posixly_correct = (getenv ("POSIXLY_CORRECT") != NULL);
-# endif
-
- const char *yesexpr, *noexpr;
- int result;
-
- /* TRANSLATORS: A regular expression testing for an affirmative answer
- (english: "yes"). Testing the first character may be sufficient.
- Take care to consider upper and lower case.
- To enquire the regular expression that your system uses for this
- purpose, you can use the command
- locale -k LC_MESSAGES | grep '^yesexpr=' */
- yesexpr = localized_pattern (N_("^[yY]"), YESEXPR, posixly_correct);
- result = try (response, yesexpr, &last_yesexpr, &cached_yesre);
- if (result < 0)
- return -1;
- if (result)
- return 1;
-
- /* TRANSLATORS: A regular expression testing for a negative answer
- (english: "no"). Testing the first character may be sufficient.
- Take care to consider upper and lower case.
- To enquire the regular expression that your system uses for this
- purpose, you can use the command
- locale -k LC_MESSAGES | grep '^noexpr=' */
- noexpr = localized_pattern (N_("^[nN]"), NOEXPR, posixly_correct);
- result = try (response, noexpr, &last_noexpr, &cached_nore);
- if (result < 0)
- return -1;
- if (result)
- return 0;
-
- return -1;
-#else
- /* Test against "^[yY]" and "^[nN]", hardcoded to avoid requiring regex */
- return (*response == 'y' || *response == 'Y' ? 1
- : *response == 'n' || *response == 'N' ? 0 : -1);
-#endif
-}
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