/* Implementation of the bindtextdomain(3) function

   Copyright (C) 1995-2018 Free Software Foundation, Inc.

   This program 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.

   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 Lesser General Public License for more details.

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

   along with this program.  If not, see <http://www.gnu.org/licenses/>.  */

#ifdef HAVE_CONFIG_H

# include <config.h>

#endif

#include <stddef.h>

#include <stdlib.h>

#include <string.h>

#include "gettextP.h"

#ifdef _LIBC

# include <libintl.h>

#else

# include "libgnuintl.h"

#endif

/* Handle multi-threaded applications.  */

#ifdef _LIBC

# include <libc-lock.h>

# define gl_rwlock_define __libc_rwlock_define

# define gl_rwlock_wrlock __libc_rwlock_wrlock

# define gl_rwlock_unlock __libc_rwlock_unlock

#else

# include "lock.h"

#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 @@ */

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

gl_rwlock_define (extern, _nl_state_lock attribute_hidden)

/* 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

# ifndef strdup

#  define strdup(str) __strdup (str)

# endif

#else

# define BINDTEXTDOMAIN libintl_bindtextdomain

# define BIND_TEXTDOMAIN_CODESET libintl_bind_textdomain_codeset

#endif

/* 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 (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;

    }

  gl_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))

		    {

		      free (binding->codeset);

		      binding->codeset = result;

		      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;

      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;

	    }

	  *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;

  gl_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 (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 (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