Adding upstream version 3.6.upstream/3.6upstream

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 175 insertions, 0 deletions

diff --git a/lib/rpmatch.c b/lib/rpmatch.c
new file mode 100644
index 0000000..a07c9b9
--- /dev/null
+++ b/lib/rpmatch.c
@@ -0,0 +1,175 @@
+/* Determine whether string value is affirmation or negative response
+   according to current locale's data.
+
+   Copyright (C) 1996, 1998, 2000, 2002-2003, 2006-2023 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 <https://www.gnu.org/licenses/>.  */
+
+#include <config.h>
+
+/* Specification.  */
+#include <stdlib.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)
+        {
+          free (safe_pattern);
+          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
+}