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/* Determine whether string value is affirmation or negative response
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according to current locale's data.
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Copyright (C) 1996, 1998, 2000, 2002-2003, 2006-2012 Free Software
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This program is free software: you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 3 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program. If not, see <http://www.gnu.org/licenses/>. */
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# include <sys/types.h>
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# if HAVE_LANGINFO_YESEXPR
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# include <langinfo.h>
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# define _(msgid) gettext (msgid)
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# define N_(msgid) gettext_noop (msgid)
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# if HAVE_LANGINFO_YESEXPR
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/* Return the localized regular expression pattern corresponding to
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ENGLISH_PATTERN. NL_INDEX can be used with nl_langinfo.
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The resulting string may only be used until the next nl_langinfo call. */
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localized_pattern (const char *english_pattern, nl_item nl_index,
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const char *translated_pattern;
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/* We prefer to get the patterns from a PO file. It would be possible to
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always use nl_langinfo (YESEXPR) instead of _("^[yY]"), and
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nl_langinfo (NOEXPR) instead of _("^[nN]"), if we could assume that the
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system's locale support is good. But this is not the case e.g. on Cygwin.
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The localizations of gnulib.pot are of better quality in general.
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Also, if we use locale info from non-free systems that don't have a
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'localedef' command, we deprive the users of the freedom to localize
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this pattern for their preferred language.
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But some programs, such as 'cp', 'mv', 'rm', 'find', 'xargs', are
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specified by POSIX to use nl_langinfo (YESEXPR). We implement this
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behaviour if POSIXLY_CORRECT is set, for the sake of these programs. */
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/* If the user wants strict POSIX compliance, use nl_langinfo. */
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translated_pattern = nl_langinfo (nl_index);
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/* Check against a broken system return value. */
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if (translated_pattern != NULL && translated_pattern[0] != '\0')
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return translated_pattern;
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/* Look in the gnulib message catalog. */
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translated_pattern = _(english_pattern);
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if (translated_pattern == english_pattern)
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/* The gnulib message catalog provides no translation.
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Try the system's message catalog. */
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translated_pattern = nl_langinfo (nl_index);
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/* Check against a broken system return value. */
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if (translated_pattern != NULL && translated_pattern[0] != '\0')
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return translated_pattern;
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/* Fall back to English. */
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translated_pattern = english_pattern;
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return translated_pattern;
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# define localized_pattern(english_pattern,nl_index,posixly_correct) \
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try (const char *response, const char *pattern, char **lastp, regex_t *re)
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if (*lastp == NULL || strcmp (pattern, *lastp) != 0)
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/* The pattern has changed. */
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/* Free the old compiled pattern. */
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/* Put the PATTERN into safe memory before calling regcomp.
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(regcomp may call nl_langinfo, overwriting PATTERN's storage. */
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safe_pattern = strdup (pattern);
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if (safe_pattern == NULL)
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/* Compile the pattern and cache it for future runs. */
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if (regcomp (re, safe_pattern, REG_EXTENDED) != 0)
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*lastp = safe_pattern;
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/* See if the regular expression matches RESPONSE. */
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return regexec (re, response, 0, NULL, 0) == 0;
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rpmatch (const char *response)
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/* Match against one of the response patterns, compiling the pattern
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first if necessary. */
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/* We cache the response patterns and compiled regexps here. */
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static char *last_yesexpr, *last_noexpr;
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static regex_t cached_yesre, cached_nore;
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# if HAVE_LANGINFO_YESEXPR
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bool posixly_correct = (getenv ("POSIXLY_CORRECT") != NULL);
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const char *yesexpr, *noexpr;
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/* TRANSLATORS: A regular expression testing for an affirmative answer
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(english: "yes"). Testing the first character may be sufficient.
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Take care to consider upper and lower case.
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To enquire the regular expression that your system uses for this
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purpose, you can use the command
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locale -k LC_MESSAGES | grep '^yesexpr=' */
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yesexpr = localized_pattern (N_("^[yY]"), YESEXPR, posixly_correct);
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result = try (response, yesexpr, &last_yesexpr, &cached_yesre);
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/* TRANSLATORS: A regular expression testing for a negative answer
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(english: "no"). Testing the first character may be sufficient.
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Take care to consider upper and lower case.
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To enquire the regular expression that your system uses for this
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purpose, you can use the command
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locale -k LC_MESSAGES | grep '^noexpr=' */
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noexpr = localized_pattern (N_("^[nN]"), NOEXPR, posixly_correct);
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result = try (response, noexpr, &last_noexpr, &cached_nore);
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/* Test against "^[yY]" and "^[nN]", hardcoded to avoid requiring regex */
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return (*response == 'y' || *response == 'Y' ? 1
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: *response == 'n' || *response == 'N' ? 0 : -1);
added
removed
lib/rpmatch.c
