1 files changed, 79 insertions, 0 deletions
diff --git a/lib/rpmatch.c b/lib/rpmatch.c
new file mode 100644
index 0000000..e5f79f8
--- /dev/null
+++ b/lib/rpmatch.c
@@ -0,0 +1,79 @@
+/* Determine whether string value is affirmation or negative response
+   according to current locale's data.
+
+   Copyright (C) 1996, 1998, 2000, 2002, 2003, 2006 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 2, 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, write to the Free Software Foundation,
+   Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.  */
+
+#include <config.h>
+
+#include <stddef.h>
+#include <stdlib.h>
+
+#if ENABLE_NLS
+# include <sys/types.h>
+# include <limits.h>
+# include <regex.h>
+# include "gettext.h"
+# define _(msgid) gettext (msgid)
+
+static int
+try (const char *response, const char *pattern, const int match,
+     const int nomatch, const char **lastp, regex_t *re)
+{
+  if (pattern != *lastp)
+    {
+      /* The pattern has changed.  */
+      if (*lastp)
+	{
+	  /* 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;
+    }
+
+  /* See if the regular expression matches RESPONSE.  */
+  return regexec (re, response, 0, NULL, 0) == 0 ? match : nomatch;
+}
+#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 const char *yesexpr, *noexpr;
+  static regex_t yesre, nore;
+  int result;
+
+  return ((result = try (response, _("^[yY]"), 1, 0,
+			 &yesexpr, &yesre))
+	  ? result
+	  : try (response, _("^[nN]"), 0, -1, &noexpr, &nore));
+#else
+  /* Test against "^[yY]" and "^[nN]", hardcoded to avoid requiring regex */
+  return (*response == 'y' || *response == 'Y' ? 1
+	  : *response == 'n' || *response == 'N' ? 0 : -1);
+#endif
+}