1/* GNU gettext - internationalization aids
2   Copyright (C) 1996, 1998, 2000-2002 Free Software Foundation, Inc.
3
4   This file was written by Peter Miller <millerp@canb.auug.org.au>
5
6   This program is free software; you can redistribute it and/or modify
7   it under the terms of the GNU General Public License as published by
8   the Free Software Foundation; either version 2, or (at your option)
9   any later version.
10
11   This program is distributed in the hope that it will be useful,
12   but WITHOUT ANY WARRANTY; without even the implied warranty of
13   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
14   GNU General Public License for more details.
15
16   You should have received a copy of the GNU General Public License
17   along with this program; if not, write to the Free Software Foundation,
18   Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.  */
19
20
21#ifdef HAVE_CONFIG_H
22#include "config.h"
23#endif
24
25/* Specification.  */
26#include "dir-list.h"
27
28#include <stddef.h>
29#include <stdlib.h>
30
31#include "str-list.h"
32
33static string_list_ty *directory /* = NULL */;
34
35
36/* Append a directory to the end of the list of directories.  */
37void
38dir_list_append (const char *s)
39{
40  if (directory == NULL)
41    directory = string_list_alloc ();
42  string_list_append_unique (directory, s);
43}
44
45
46/* Return the nth directory, or NULL of n is out of range.  */
47const char *
48dir_list_nth (int n)
49{
50  /* The default value of the list consists of the single directory ".".  */
51  if (directory == NULL)
52    dir_list_append (".");
53
54  if (n < 0 || n >= directory->nitems)
55    return NULL;
56  return directory->item[n];
57}
58
59
60/* Return the current list of directories, for later use with dir_list_restore.
61   Reset the list to empty.  */
62void *
63dir_list_save_reset ()
64{
65  void *saved_value = directory;
66
67  directory = NULL;
68  return saved_value;
69}
70
71
72/* Restore a previously saved list of directories.  */
73void
74dir_list_restore (void *saved_value)
75{
76  /* Don't free the contained strings, because they may have been returned
77     by dir_list_nth and may still be in use.  */
78  if (directory != NULL)
79    {
80      if (directory->item != NULL)
81	free (directory->item);
82      free (directory);
83    }
84
85  directory = saved_value;
86}
87