/* Copyright (C) 1996-2018 Free Software Foundation, Inc.

   This file is part of the GNU C Library.

   Contributed by Ulrich Drepper, <drepper@gnu.org>.

   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, see

   <http://www.gnu.org/licenses/>.  */

#include <errno.h>

#include <locale.h>

#include <nl_types.h>

#include <stdlib.h>

#include <string.h>

#include <unistd.h>

#include <sys/mman.h>

#include "catgetsinfo.h"

/* Open the catalog and return a descriptor for the catalog.  */

nl_catd

catopen (const char *cat_name, int flag)

{

  __nl_catd result;

  const char *env_var = NULL;

  const char *nlspath = NULL;

  char *tmp = NULL;

  if (strchr (cat_name, '/') == NULL)

    {

      if (flag == NL_CAT_LOCALE)

	/* Use the current locale setting for LC_MESSAGES.  */

	env_var = setlocale (LC_MESSAGES, NULL);

      else

	/* Use the LANG environment variable.  */

	env_var = getenv ("LANG");

      if (env_var == NULL || *env_var == '\0'

	  || (__libc_enable_secure && strchr (env_var, '/') != NULL))

	env_var = "C";

      nlspath = getenv ("NLSPATH");

      if (nlspath != NULL && *nlspath != '\0')

	{

	  /* Append the system dependent directory.  */

	  size_t len = strlen (nlspath) + 1 + sizeof NLSPATH;

	  tmp = malloc (len);

	  if (__glibc_unlikely (tmp == NULL))

	    return (nl_catd) -1;

	  __stpcpy (__stpcpy (__stpcpy (tmp, nlspath), ":"), NLSPATH);

	  nlspath = tmp;

	}

      else

	nlspath = NLSPATH;

    }

  result = (__nl_catd) malloc (sizeof (*result));

  if (result == NULL)

    {

      /* We cannot get enough memory.  */

      result = (nl_catd) -1;

    }

  else if (__open_catalog (cat_name, nlspath, env_var, result) != 0)

    {

      /* Couldn't open the file.  */

      free ((void *) result);

      result = (nl_catd) -1;

    }

  free (tmp);

  return (nl_catd) result;

}

/* Return message from message catalog.  */

char *

catgets (nl_catd catalog_desc, int set, int message, const char *string)

{

  __nl_catd catalog;

  size_t idx;

  size_t cnt;

  /* Be generous if catalog which failed to be open is used.  */

  if (catalog_desc == (nl_catd) -1 || ++set <= 0 || message < 0)

    return (char *) string;

  catalog = (__nl_catd) catalog_desc;

  idx = ((set * message) % catalog->plane_size) * 3;

  cnt = 0;

  do

    {

      if (catalog->name_ptr[idx + 0] == (uint32_t) set

	  && catalog->name_ptr[idx + 1] == (uint32_t) message)

	return (char *) &catalog->strings[catalog->name_ptr[idx + 2]];

      idx += catalog->plane_size * 3;

    }

  while (++cnt < catalog->plane_depth);

  __set_errno (ENOMSG);

  return (char *) string;

}

/* Return resources used for loaded message catalog.  */

int

catclose (nl_catd catalog_desc)

{

  __nl_catd catalog;

  /* Be generous if catalog which failed to be open is used.  */

  if (catalog_desc == (nl_catd) -1)

    {

      __set_errno (EBADF);

      return -1;

    }

  catalog = (__nl_catd) catalog_desc;

#ifdef _POSIX_MAPPED_FILES

  if (catalog->status == mmapped)

    __munmap ((void *) catalog->file_ptr, catalog->file_size);

  else

#endif	/* _POSIX_MAPPED_FILES */

    if (catalog->status == malloced)

      free ((void *) catalog->file_ptr);

    else

      {

	__set_errno (EBADF);

	return -1;

      }

  free ((void *) catalog);

  return 0;

}