path: root/locale/programs/charmap.c

/* Copyright (C) 1996 Free Software Foundation, Inc.
This file is part of the GNU C Library.
Contributed by Ulrich Drepper, <drepper@gnu.ai.mit.edu>.

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.  */

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

#include <ctype.h>
#include <errno.h>
#include <libintl.h>
#include <obstack.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>

#include "error.h"
#include "linereader.h"
#include "charset.h"


/* Uncomment following line for production version.  */
/* define NDEBUG 1 */
#include <assert.h>


/* Define the lookup function.  */
#include "charmap-kw.h"


void *xmalloc (size_t __n);

/* Prototypes for local functions.  */
static struct charset_t *parse_charmap (const char *filename);
static void new_width (struct linereader *cmfile, struct charset_t *result,
		       const char *from, const char *to,
		       unsigned long int width);


struct charset_t *
charmap_read (const char *filename)
{
  const char *pathnfile;
  struct charset_t *result = NULL;

  if (filename != NULL)
    {
      if (euidaccess (filename, R_OK) >= 0)
	pathnfile = filename;
      else
	{
	  char *cp = xmalloc (strlen (filename) + sizeof CHARMAP_PATH + 1);
	  stpcpy (stpcpy (stpcpy (cp, CHARMAP_PATH), "/"), filename);

	  pathnfile = (const char *) cp;
	}

      result = parse_charmap (pathnfile);

      if (result == NULL)
	error (0, errno, _("character map file `%s' not found"), filename);
    }

  if (result == NULL)
    {
      pathnfile = CHARMAP_PATH "/" DEFAULT_CHARMAP;

      result = parse_charmap (pathnfile);

      if (result == NULL)
	error (4, errno, _("default character map file `%s' not found"),
	       DEFAULT_CHARMAP);
    }

  return result;
}


static struct charset_t *
parse_charmap (const char *filename)
{
  struct linereader *cmfile;
  struct charset_t *result;
  int state;
  enum token_t expected_tok = tok_error;
  const char *expected_str = NULL;
  char *from_name = NULL;
  char *to_name = NULL;

  /* Determine path.  */
  cmfile = lr_open (filename, charmap_hash);
  if (cmfile == NULL)
    {
      if (strchr (filename, '/') == NULL)
	{
	  /* Look in the systems charmap directory.  */
	  char