glibc/catgets/catgets.c

/* Copyright (C) 1996, 1997, 1998, 1999, 2000 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 Library General Public License as
   published by the Free Software Foundation; either version 2 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
   Library General Public License for more details.

   You should have received a copy of the GNU Library General Public
   License along with the GNU C Library; see the file COPYING.LIB.  If not,
   write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
   Boston, MA 02111-1307, USA.  */

#include <alloca.h>
#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;
  size_t cat_name_len = strlen (cat_name) + 1;
  size_t env_var_len = 0;
  size_t nlspath_len = 0;
  char *endp;

  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";

      env_var_len = strlen (env_var) + 1;

      nlspath = __secure_getenv ("NLSPATH");
      if (nlspath != NULL && *nlspath != '\0')
	{
	  /* Append the system dependent directory.  */
	  size_t len = strlen (nlspath) + 1 + sizeof NLSPATH;
	  char *tmp = alloca (len);

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

	  nlspath_len = len;
	}
      else
	{
	  nlspath = NLSPATH;

	  nlspath_len = sizeof NLSPATH;
	}
    }

  result = (__nl_catd) malloc (sizeof (*result) + cat_name_len
			       + env_var_len + nlspath_len);
  if (result == NULL)
    /* We cannot get enough memory.  */
    return (nl_catd) -1;

  result->status = closed;
  result->cat_name = endp = (char *) (result + 1);
  endp = __mempcpy (endp, cat_name, cat_name_len);

  result->env_var = cat_name_len != 0 ? endp : NULL;
  endp = __mempcpy (endp, env_var, env_var_len);

  result->nlspath = nlspath_len != 0 ? endp : NULL;
  memcpy (endp, nlspath, nlspath_len);

  __libc_lock_init (result->lock);

  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;

  if (catalog->status == closed)
    __open_catalog (catalog);

  if (catalog->status == nonexisting)
    {
      __set_errno (EBADF);
      return (char *) string;
    }

  idx = ((set * message) % catalog->plane_size) * 3;
  cnt = 0;
  do
    {
      if (catalog->name_ptr[idx + 0] == (u_int32_t) set
	  && catalog->name_ptr[idx + 1] == (u_int32_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;

  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 if (catalog->status != closed && catalog->status != nonexisting)
      {
	__set_errno (EBADF);
	return -1;
      }

  free ((void *) catalog);

  return 0;
}