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/* Implementation of the bindtextdomain(3) function

   Copyright (C) 1995-1998, 2000, 2001 Free Software Foundation, Inc.

   This file is part of the GNU C Library.

   The GNU C Library is free software; you can redistribute it and/or

   modify it under the terms of the GNU Lesser General Public

   License as published by the Free Software Foundation; either

   version 2.1 of the License, or (at your option) any later version.

   The GNU C Library 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

   Lesser General Public License for more details.

   You should have received a copy of the GNU Lesser General Public

   License along with the GNU C Library; if not, write to the Free

   Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA

   02111-1307 USA.  */

#ifdef HAVE_CONFIG_H

# include <config.h>

#endif

#if defined STDC_HEADERS || defined _LIBC

# include <stdlib.h>

#else

# ifdef HAVE_MALLOC_H

#  include <malloc.h>

# else

void free ();

# endif

#endif

#if defined HAVE_STRING_H || defined _LIBC

# include <string.h>

#else

# include <strings.h>

# ifndef memcpy

#  define memcpy(Dst, Src, Num) (bcopy (Src, Dst, Num), (Dst))

# endif

#endif

#ifdef _LIBC

# include <libintl.h>

#else

# include "libgnuintl.h"

#endif

#include "gettextP.h"

#ifdef _LIBC

/* We have to handle multi-threaded applications.  */

# include <bits/libc-lock.h>

#else

/* Provide dummy implementation if this is outside glibc.  */

# define __libc_rwlock_define(CLASS, NAME)

# define __libc_rwlock_wrlock(NAME)

# define __libc_rwlock_unlock(NAME)

#endif

/* The internal variables in the standalone libintl.a must have different

   names than the internal variables in GNU libc, otherwise programs

   using libintl.a cannot be linked statically.  */

#if !defined _LIBC

# define _nl_default_dirname _nl_default_dirname__

# define _nl_domain_bindings _nl_domain_bindings__

#endif

/* Some compilers, like SunOS4 cc, don't have offsetof in <stddef.h>.  */

#ifndef offsetof

# define offsetof(type,ident) ((size_t)&(((type*)0)->ident))

#endif

/* @@ end of prolog @@ */

/* Contains the default location of the message catalogs.  */

extern const char _nl_default_dirname[];

/* List with bindings of specific domains.  */

extern struct binding *_nl_domain_bindings;

/* Lock variable to protect the global data in the gettext implementation.  */

__libc_rwlock_define (extern, _nl_state_lock)

/* Names for the libintl functions are a problem.  They must not clash

   with existing names and they should follow ANSI C.  But this source

   code is also used in GNU C Library where the names have a __

   prefix.  So we have to make a difference here.  */

#ifdef _LIBC

# define BINDTEXTDOMAIN __bindtextdomain

# define BIND_TEXTDOMAIN_CODESET __bind_textdomain_codeset

# ifdef _GLIBC

#  ifndef strdup

#   define strdup(str) __strdup (str)

#  endif

# endif

#else

# define BINDTEXTDOMAIN bindtextdomain__

# define BIND_TEXTDOMAIN_CODESET bind_textdomain_codeset__

#endif

/* Prototypes for local functions.  */

static void set_binding_values PARAMS ((const char *domainname,

                                        const char **dirnamep,

                                        const char **codesetp));

/* Specifies the directory name *DIRNAMEP and the output codeset *CODESETP

   to be used for the DOMAINNAME message catalog.

   If *DIRNAMEP or *CODESETP is NULL, the corresponding attribute is not

   modified, only the current value is returned.

   If DIRNAMEP or CODESETP is NULL, the corresponding attribute is neither

   modified nor returned.  */

static void

set_binding_values (domainname, dirnamep, codesetp)

     const char *domainname;

     const char **dirnamep;

     const char **codesetp;

{

  struct binding *binding;

  int modified;

  /* Some sanity checks.  */

  if (domainname == NULL || domainname[0] == '\0')

    {

      if (dirnamep)

        *dirnamep = NULL;

      if (codesetp)

        *codesetp = NULL;

      return;

    }

  __libc_rwlock_wrlock (_nl_state_lock);

  modified = 0;

  for (binding = _nl_domain_bindings; binding != NULL; binding = binding->next)

    {

      int compare = strcmp (domainname, binding->domainname);

      if (compare == 0)

        /* We found it!  */

        break;

      if (compare < 0)

        {

          /* It is not in the list.  */

          binding = NULL;

          break;

        }

    }

  if (binding != NULL)

    {

      if (dirnamep)

        {

          const char *dirname = *dirnamep;

          if (dirname == NULL)

            /* The current binding has be to returned.  */

            *dirnamep = binding->dirname;

          else

            {

              /* The domain is already bound.  If the new value and the old

                 one are equal we simply do nothing.  Otherwise replace the

                 old binding.  */

              char *result = binding->dirname;

              if (strcmp (dirname, result) != 0)

                {

                  if (strcmp (dirname, _nl_default_dirname) == 0)

                    result = (char *) _nl_default_dirname;

                  else

                    {

#if defined _LIBC || defined HAVE_STRDUP

                      result = strdup (dirname);

#else

                      size_t len = strlen (dirname) + 1;

                      result = (char *) malloc (len);

                      if (__builtin_expect (result != NULL, 1))

                        memcpy (result, dirname, len);

#endif

                    }

                  if (__builtin_expect (result != NULL, 1))

                    {

                      if (binding->dirname != _nl_default_dirname)

                        free (binding->dirname);

                      binding->dirname = result;

                      modified = 1;

                    }

                }

              *dirnamep = result;

            }

        }

      if (codesetp)

        {

          const char *codeset = *codesetp;

          if (codeset == NULL)

            /* The current binding has be to returned.  */

            *codesetp = binding->codeset;

          else

            {

              /* The domain is already bound.  If the new value and the old

                 one are equal we simply do nothing.  Otherwise replace the

                 old binding.  */

              char *result = binding->codeset;

              if (result == NULL || strcmp (codeset, result) != 0)

                {

#if defined _LIBC || defined HAVE_STRDUP

                  result = strdup (codeset);

#else

                  size_t len = strlen (codeset) + 1;

                  result = (char *) malloc (len);

                  if (__builtin_expect (result != NULL, 1))

                    memcpy (result, codeset, len);

#endif

                  if (__builtin_expect (result != NULL, 1))

                    {

                      if (binding->codeset != NULL)

                        free (binding->codeset);

                      binding->codeset = result;

                      ++binding->codeset_cntr;

                      modified = 1;

                    }

                }

              *codesetp = result;

            }

        }

    }

  else if ((dirnamep == NULL || *dirnamep == NULL)

           && (codesetp == NULL || *codesetp == NULL))

    {

      /* Simply return the default values.  */

      if (dirnamep)

        *dirnamep = _nl_default_dirname;

      if (codesetp)

        *codesetp = NULL;

    }

  else

    {

      /* We have to create a new binding.  */

      size_t len = strlen (domainname) + 1;

      struct binding *new_binding =

        (struct binding *) malloc (offsetof (struct binding, domainname) + len);

      if (__builtin_expect (new_binding == NULL, 0))

        goto failed;

      memcpy (new_binding->domainname, domainname, len);

      if (dirnamep)

        {

          const char *dirname = *dirnamep;

          if (dirname == NULL)

            /* The default value.  */

            dirname = _nl_default_dirname;

          else

            {

              if (strcmp (dirname, _nl_default_dirname) == 0)

                dirname = _nl_default_dirname;

              else

                {

                  char *result;

#if defined _LIBC || defined HAVE_STRDUP

                  result = strdup (dirname);

                  if (__builtin_expect (result == NULL, 0))

                    goto failed_dirname;

#else

                  size_t len = strlen (dirname) + 1;

                  result = (char *) malloc (len);

                  if (__builtin_expect (result == NULL, 0))

                    goto failed_dirname;

                  memcpy (result, dirname, len);

#endif

                  dirname = result;

                }

            }

          *dirnamep = dirname;

          new_binding->dirname = (char *) dirname;

        }

      else

        /* The default value.  */

        new_binding->dirname = (char *) _nl_default_dirname;

      new_binding->codeset_cntr = 0;

      if (codesetp)

        {

          const char *codeset = *codesetp;

          if (codeset != NULL)

            {

              char *result;

#if defined _LIBC || defined HAVE_STRDUP

              result = strdup (codeset);

              if (__builtin_expect (result == NULL, 0))

                goto failed_codeset;

#else

              size_t len = strlen (codeset) + 1;

              result = (char *) malloc (len);

              if (__builtin_expect (result == NULL, 0))

                goto failed_codeset;

              memcpy (result, codeset, len);

#endif

              codeset = result;

              ++new_binding->codeset_cntr;

            }

          *codesetp = codeset;

          new_binding->codeset = (char *) codeset;

        }

      else

        new_binding->codeset = NULL;

      /* Now enqueue it.  */

      if (_nl_domain_bindings == NULL

          || strcmp (domainname, _nl_domain_bindings->domainname) < 0)

        {

          new_binding->next = _nl_domain_bindings;

          _nl_domain_bindings = new_binding;

        }

      else

        {

          binding = _nl_domain_bindings;

          while (binding->next != NULL

                 && strcmp (domainname, binding->next->domainname) > 0)

            binding = binding->next;

          new_binding->next = binding->next;

          binding->next = new_binding;

        }

      modified = 1;

      /* Here we deal with memory allocation failures.  */

      if (0)

        {

        failed_codeset:

          if (new_binding->dirname != _nl_default_dirname)

            free (new_binding->dirname);

        failed_dirname:

          free (new_binding);

        failed:

          if (dirnamep)

            *dirnamep = NULL;

          if (codesetp)

            *codesetp = NULL;

        }

    }

  /* If we modified any binding, we flush the caches.  */

  if (modified)

    ++_nl_msg_cat_cntr;

  __libc_rwlock_unlock (_nl_state_lock);

}

/* Specify that the DOMAINNAME message catalog will be found

   in DIRNAME rather than in the system locale data base.  */

char *

BINDTEXTDOMAIN (domainname, dirname)

     const char *domainname;

     const char *dirname;

{

  set_binding_values (domainname, &dirname, NULL);

  return (char *) dirname;

}

/* Specify the character encoding in which the messages from the

   DOMAINNAME message catalog will be returned.  */

char *

BIND_TEXTDOMAIN_CODESET (domainname, codeset)

     const char *domainname;

     const char *codeset;

{

  set_binding_values (domainname, NULL, &codeset);

  return (char *) codeset;

}

#ifdef _LIBC

/* Aliases for function names in GNU C Library.  */

weak_alias (__bindtextdomain, bindtextdomain);

weak_alias (__bind_textdomain_codeset, bind_textdomain_codeset);

#endif