1 /* dirname.c -- return all but the last element in a path
2 Copyright (C) 1990, 1998, 2000 Free Software Foundation, Inc.
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)
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.
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. */
27 #if defined STDC_HEADERS || defined HAVE_STRING_H
32 # define strrchr rindex
40 # define ISSLASH(C) ((C) == '/')
43 #define BACKSLASH_IS_PATH_SEPARATOR ISSLASH ('\\')
45 /* Return the leading directories part of PATH,
46 allocated with malloc. If out of memory, return 0.
47 Assumes that trailing slashes have already been
51 dir_name (const char *path)
55 int length; /* Length of result, not including NUL. */
57 slash = strrchr (path, '/');
58 if (BACKSLASH_IS_PATH_SEPARATOR)
60 char *b = strrchr (path, '\\');
65 /* Make sure there are no trailing slashes. */
66 assert (slash == NULL /* There are no slashes in PATH. */
67 || slash[1] != 0 /* There is a non-NUL byte after the last slash. */
68 || path == slash /* PATH is just `/'. */
73 /* File is in the current directory. */
79 /* Remove any trailing slashes from the result. */
80 if (BACKSLASH_IS_PATH_SEPARATOR)
82 const char *lim = ((path[0] >= 'A' && path[0] <= 'z'
86 /* If canonicalized "d:/path", leave alone the root case "d:/". */
87 while (slash > lim && ISSLASH (*slash))
92 while (slash > path && ISSLASH (*slash))
96 length = slash - path + 1;
99 newpath = (char *) malloc (length + 1);
102 strncpy (newpath, path, length);