1 /* $NetBSD: dirname.c,v 1.13 2014/07/16 10:52:26 christos Exp $ */
4 * Copyright (c) 1997, 2002 The NetBSD Foundation, Inc.
7 * This code is derived from software contributed to The NetBSD Foundation
8 * by Klaus Klein and Jason R. Thorpe.
10 * Redistribution and use in source and binary forms, with or without
11 * modification, are permitted provided that the following conditions
13 * 1. Redistributions of source code must retain the above copyright
14 * notice, this list of conditions and the following disclaimer.
15 * 2. Redistributions in binary form must reproduce the above copyright
16 * notice, this list of conditions and the following disclaimer in the
17 * documentation and/or other materials provided with the distribution.
19 * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
20 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
21 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
22 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
23 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
24 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
25 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
26 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
27 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
28 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
29 * POSSIBILITY OF SUCH DAMAGE.
37 #include <sys/cdefs.h>
38 #include <sys/param.h>
49 # define PATH_MAX 1024
52 # define MIN(a, b) ((a < b) ? a : b)
57 xdirname_r(const char *path, char *buf, size_t buflen)
63 * If `path' is a null pointer or points to an empty string,
64 * return a pointer to the string ".".
66 if (path == NULL || *path == '\0') {
72 /* Strip trailing slashes, if any. */
73 endp = path + strlen(path) - 1;
74 while (endp != path && *endp == '/')
77 /* Find the start of the dir */
78 while (endp > path && *endp != '/')
82 path = *endp == '/' ? "/" : ".";
89 while (endp > path && *endp == '/');
91 len = endp - path + 1;
93 if (buf != NULL && buflen != 0) {
94 buflen = MIN(len, buflen - 1);
95 memcpy(buf, path, buflen);
104 static char result[PATH_MAX];
105 (void)xdirname_r(path, result, sizeof(result));
114 main(int argc, char *argv[])
116 printf("%s\n", dirname(argv[1]));