]> git.saurik.com Git - bison.git/blame - lib/dirname.c
* lib/bitset.h (BITSET_FOR_EACH, BITSET_FOR_EACH_REVERSE):
[bison.git] / lib / dirname.c
CommitLineData
22312b71 1/* dirname.c -- return all but the last element in a path
eb956856 2 Copyright 1990, 1998, 2000, 2001 Free Software Foundation, Inc.
22312b71
AD
3
4 This program is free software; you can redistribute it and/or modify
5 it under the terms of the GNU General Public License as published by
6 the Free Software Foundation; either version 2, or (at your option)
7 any later version.
8
9 This program is distributed in the hope that it will be useful,
10 but WITHOUT ANY WARRANTY; without even the implied warranty of
11 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
12 GNU General Public License for more details.
13
14 You should have received a copy of the GNU General Public License
15 along with this program; if not, write to the Free Software Foundation,
16 Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. */
17
18#if HAVE_CONFIG_H
19# include <config.h>
20#endif
21
eb956856 22#if STDC_HEADERS || HAVE_STRING_H
22312b71 23# include <string.h>
22312b71
AD
24#endif
25
26#include "dirname.h"
eb956856 27#include "xalloc.h"
22312b71 28
eb956856
PE
29/* Return the length of `dirname (PATH)', or zero if PATH is
30 in the working directory. Works properly even if
31 there are trailing slashes (by effectively ignoring them). */
32size_t
33dir_len (char const *path)
22312b71 34{
eb956856
PE
35 size_t prefix_length = FILESYSTEM_PREFIX_LEN (path);
36 size_t length;
22312b71 37
eb956856
PE
38 /* Strip the basename and any redundant slashes before it. */
39 for (length = base_name (path) - path; prefix_length < length; length--)
40 if (! ISSLASH (path[length - 1]))
41 return length;
22312b71 42
eb956856
PE
43 /* But don't strip the only slash from "/". */
44 return prefix_length + ISSLASH (path[prefix_length]);
22312b71
AD
45}
46
47/* Return the leading directories part of PATH,
eb956856 48 allocated with xmalloc.
22312b71
AD
49 Works properly even if there are trailing slashes
50 (by effectively ignoring them). */
51
52char *
53dir_name (char const *path)
54{
eb956856
PE
55 size_t length = dir_len (path);
56 int append_dot = (length == FILESYSTEM_PREFIX_LEN (path));
57 char *newpath = xmalloc (length + append_dot + 1);
58 memcpy (newpath, path, length);
22312b71
AD
59 if (append_dot)
60 newpath[length++] = '.';
61 newpath[length] = 0;
62 return newpath;
63}
64
65#ifdef TEST_DIRNAME
66/*
67
68Run the test like this (expect no output):
eb956856
PE
69 gcc -DHAVE_CONFIG_H -DTEST_DIRNAME -I.. -O -Wall \
70 basename.c dirname.c xmalloc.c
22312b71
AD
71 sed -n '/^BEGIN-DATA$/,/^END-DATA$/p' dirname.c|grep -v DATA|./a.out
72
73BEGIN-DATA
74foo//// .
75bar/foo//// bar
76foo/ .
77/ /
78. .
79a .
80END-DATA
81
82*/
83
84# define MAX_BUFF_LEN 1024
85# include <stdio.h>
22312b71
AD
86
87int
88main ()
89{
90 char buff[MAX_BUFF_LEN + 1];
91
92 buff[MAX_BUFF_LEN] = 0;
93 while (fgets (buff, MAX_BUFF_LEN, stdin) && buff[0])
94 {
95 char path[MAX_BUFF_LEN];
96 char expected_result[MAX_BUFF_LEN];
97 char const *result;
98 sscanf (buff, "%s %s", path, expected_result);
99 result = dir_name (path);
100 if (strcmp (result, expected_result))
101 printf ("%s: got %s, expected %s\n", path, result, expected_result);
102 }
eb956856 103 return 0;
22312b71
AD
104}
105#endif