/* Fake setlocale - platform independent, for testing purposes.
   Copyright (C) 2001-2002 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/>.  */

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

#include <stdlib.h>
#include <locale.h>
#include <string.h>

/* Return string representation of locale CATEGORY.  */
static const char *
category_to_name (int category)
{
  const char *retval;

  switch (category)
  {
#ifdef LC_COLLATE
  case LC_COLLATE:
    retval = "LC_COLLATE";
    break;
#endif
#ifdef LC_CTYPE
  case LC_CTYPE:
    retval = "LC_CTYPE";
    break;
#endif
#ifdef LC_MONETARY
  case LC_MONETARY:
    retval = "LC_MONETARY";
    break;
#endif
#ifdef LC_NUMERIC
  case LC_NUMERIC:
    retval = "LC_NUMERIC";
    break;
#endif
#ifdef LC_TIME
  case LC_TIME:
    retval = "LC_TIME";
    break;
#endif
#ifdef LC_MESSAGES
  case LC_MESSAGES:
    retval = "LC_MESSAGES";
    break;
#endif
#ifdef LC_RESPONSE
  case LC_RESPONSE:
    retval = "LC_RESPONSE";
    break;
#endif
#ifdef LC_ALL
  case LC_ALL:
    /* This might not make sense but is perhaps better than any other
       value.  */
    retval = "LC_ALL";
    break;
#endif
  default:
    /* If you have a better idea for a default value let me know.  */
    retval = "LC_XXX";
  }

  return retval;
}

/* An implementation of setlocale that always succeeds, but doesn't
   actually change the behaviour of locale dependent functions.
   Assumes setenv()/putenv() is not called.  */
char *
setlocale (int category, SETLOCALE_CONST char *locale)
{
  static char C_string[] = "C";
  static char *current_locale = C_string;
  struct list
  {
    int category;
    char *current_locale;
    struct list *next;
  };
  static struct list *facets = NULL;
  struct list *facetp;
  char *retval;

  if (locale != NULL)
    {
      char *copy;

      copy = (char *) malloc (strlen (locale) + 1);
      strcpy (copy, locale);

      if (category == LC_ALL)
	{
	  while ((facetp = facets) != NULL)
	    {
	      facets = facetp->next;
	      free (facetp->current_locale);
	      free (facetp);
	    }
	  if (current_locale != C_string)
	    free (current_locale);
	  current_locale = copy;
	}
      else
	{
	  for (facetp = facets; facetp != NULL; facetp = facetp->next)
	    if (category == facetp->category)
	      {
		free (facetp->current_locale);
		facetp->current_locale = copy;
		break;
	      }
	  if (facetp == NULL)
	    {
	      facetp = (struct list *) malloc (sizeof (struct list));
	      facetp->category = category;
	      facetp->current_locale = copy;
	      facetp->next = facets;
	      facets = facetp;
	    }
	}
    }

  retval = current_locale;
  for (facetp = facets; facetp != NULL; facetp = facetp->next)
    if (category == facetp->category)
      {
	retval = facetp->current_locale;
	break;
      }

  if (retval[0] == '\0')
    {
      retval = getenv ("LC_ALL");
      if (retval == NULL || retval[0] == '\0')
	{
	  retval = getenv (category_to_name (category));
	  if (retval == NULL || retval[0] == '\0')
	    {
	      retval = getenv ("LANG");
	      if (retval == NULL || retval[0] == '\0')
		retval = "C";
	    }
	}
    }
  return retval;
}
