1/*	$NetBSD: dirname.c,v 1.1 2005/06/01 15:07:55 lukem Exp $	*/
2/*	from	NetBSD: dirname.c,v 1.7 2002/10/17 11:36:39 tron Exp	*/
3
4/*-
5 * Copyright (c) 1997, 2002 The NetBSD Foundation, Inc.
6 * All rights reserved.
7 *
8 * This code is derived from software contributed to The NetBSD Foundation
9 * by Klaus Klein and Jason R. Thorpe.
10 *
11 * Redistribution and use in source and binary forms, with or without
12 * modification, are permitted provided that the following conditions
13 * are met:
14 * 1. Redistributions of source code must retain the above copyright
15 *    notice, this list of conditions and the following disclaimer.
16 * 2. Redistributions in binary form must reproduce the above copyright
17 *    notice, this list of conditions and the following disclaimer in the
18 *    documentation and/or other materials provided with the distribution.
19 * 3. All advertising materials mentioning features or use of this software
20 *    must display the following acknowledgement:
21 *        This product includes software developed by the NetBSD
22 *        Foundation, Inc. and its contributors.
23 * 4. Neither the name of The NetBSD Foundation nor the names of its
24 *    contributors may be used to endorse or promote products derived
25 *    from this software without specific prior written permission.
26 *
27 * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
28 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
29 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
30 * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
31 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
32 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
33 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
34 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
35 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
36 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
37 * POSSIBILITY OF SUCH DAMAGE.
38 */
39
40#include "tnftp.h"
41
42char *
43dirname(path)
44	char *path;
45{
46	static char singledot[] = ".";
47	static char result[PATH_MAX];
48	char *lastp;
49	size_t len;
50
51	/*
52	 * If `path' is a null pointer or points to an empty string,
53	 * return a pointer to the string ".".
54	 */
55	if ((path == NULL) || (*path == '\0'))
56		return (singledot);
57
58	/* Strip trailing slashes, if any. */
59	lastp = path + strlen(path) - 1;
60	while (lastp != path && *lastp == '/')
61		lastp--;
62
63	/* Terminate path at the last occurence of '/'. */
64	do {
65		if (*lastp == '/') {
66			/* Strip trailing slashes, if any. */
67			while (lastp != path && *lastp == '/')
68				lastp--;
69
70			/* ...and copy the result into the result buffer. */
71			len = (lastp - path) + 1 /* last char */;
72			if (len > (PATH_MAX - 1))
73				len = PATH_MAX - 1;
74
75			memcpy(result, path, len);
76			result[len] = '\0';
77
78			return (result);
79		}
80	} while (--lastp >= path);
81
82	/* No /'s found, return a pointer to the string ".". */
83	return (singledot);
84}
85