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rpmatch.c

/* Determine whether string value is affirmation or negative response
   according to current locale's data.
   Copyright (C) 1996, 1998, 2000, 2002, 2003 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.  */

#ifdef HAVE_CONFIG_H
# include <config.h>
#endif

#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
}

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