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
39 /* Return the leading directories part of PATH,
40 allocated with malloc. If out of memory, return 0.
41 Assumes that trailing slashes have already been
45 dir_name (const char *path)
49 int length; /* Length of result, not including NUL. */
51 slash = strrchr (path, '/');
53 /* Make sure there are no trailing slashes. */
54 assert (slash == NULL /* There are no slashes in PATH. */
55 || slash[1] != 0 /* There is a non-NUL byte after the last slash. */
56 || path == slash /* PATH is just `/'. */
61 /* File is in the current directory. */
67 /* Remove any trailing slashes from the result. */
69 const char *lim = ((path[0] >= 'A' && path[0] <= 'z' && path[1] == ':')
72 /* If canonicalized "d:/path", leave alone the root case "d:/". */
73 while (slash > lim && *slash == '/')
76 while (slash > path && *slash == '/')
80 length = slash - path + 1;
82 newpath = (char *) malloc (length + 1);
85 strncpy (newpath, path, length);