1 /* GNU gettext - internationalization aids
2 Copyright (C) 1996, 1998, 2000-2002, 2006 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 3 of the License, or
9 (at your option) 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, see <https://www.gnu.org/licenses/>. */
18
19
20 #ifdef HAVE_CONFIG_H
21 #include "config.h"
22 #endif
23
24 /* Specification. */
25 #include "dir-list.h"
26
27 #include <stddef.h>
28 #include <stdlib.h>
29
30 #include "str-list.h"
31
32 static string_list_ty *directory /* = NULL */;
33
34
35 /* Append a directory to the end of the list of directories. */
36 void
dir_list_append(const char * s)37 dir_list_append (const char *s)
38 {
39 if (directory == NULL)
40 directory = string_list_alloc ();
41 string_list_append_unique (directory, s);
42 }
43
44
45 /* Return the nth directory, or NULL of n is out of range. */
46 const char *
dir_list_nth(int n)47 dir_list_nth (int n)
48 {
49 /* The default value of the list consists of the single directory ".". */
50 if (directory == NULL)
51 dir_list_append (".");
52
53 if (n < 0 || n >= directory->nitems)
54 return NULL;
55 return directory->item[n];
56 }
57
58
59 /* Return the current list of directories, for later use with dir_list_restore.
60 Reset the list to empty. */
61 void *
dir_list_save_reset()62 dir_list_save_reset ()
63 {
64 void *saved_value = directory;
65
66 directory = NULL;
67 return saved_value;
68 }
69
70
71 /* Restore a previously saved list of directories. */
72 void
dir_list_restore(void * saved_value)73 dir_list_restore (void *saved_value)
74 {
75 /* Don't free the contained strings, because they may have been returned
76 by dir_list_nth and may still be in use. */
77 if (directory != NULL)
78 {
79 if (directory->item != NULL)
80 free (directory->item);
81 free (directory);
82 }
83
84 directory = (string_list_ty *) saved_value;
85 }
86