1/*	$NetBSD: dirname.c,v 1.13 2014/07/16 10:52:26 christos Exp $	*/
2
3/*-
4 * Copyright (c) 1997, 2002 The NetBSD Foundation, Inc.
5 * All rights reserved.
6 *
7 * This code is derived from software contributed to The NetBSD Foundation
8 * by Klaus Klein and Jason R. Thorpe.
9 *
10 * Redistribution and use in source and binary forms, with or without
11 * modification, are permitted provided that the following conditions
12 * are met:
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.
18 *
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.
30 */
31
32#ifdef HAVE_CONFIG_H
33# include <config.h>
34#endif
35#ifndef HAVE_DIRNAME
36
37#include <sys/cdefs.h>
38#include <sys/param.h>
39#ifdef HAVE_LIBGEN_H
40#include <libgen.h>
41#endif
42#ifdef HAVE_LIMITS_H
43#include <limits.h>
44#endif
45#ifdef HAVE_STRING_H
46#include <string.h>
47#endif
48#ifndef PATH_MAX
49# define PATH_MAX 1024
50#endif
51#ifndef MIN
52# define MIN(a, b) ((a < b) ? a : b)
53#endif
54
55
56static size_t
57xdirname_r(const char *path, char *buf, size_t buflen)
58{
59	const char *endp;
60	size_t len;
61
62	/*
63	 * If `path' is a null pointer or points to an empty string,
64	 * return a pointer to the string ".".
65	 */
66	if (path == NULL || *path == '\0') {
67		path = ".";
68		len = 1;
69		goto out;
70	}
71
72	/* Strip trailing slashes, if any. */
73	endp = path + strlen(path) - 1;
74	while (endp != path && *endp == '/')
75		endp--;
76
77	/* Find the start of the dir */
78	while (endp > path && *endp != '/')
79		endp--;
80
81	if (endp == path) {
82		path = *endp == '/' ? "/" : ".";
83		len = 1;
84		goto out;
85	}
86
87	do
88		endp--;
89	while (endp > path && *endp == '/');
90
91	len = endp - path + 1;
92out:
93	if (buf != NULL && buflen != 0) {
94		buflen = MIN(len, buflen - 1);
95		memcpy(buf, path, buflen);
96		buf[buflen] = '\0';
97	}
98	return len;
99}
100
101char *
102dirname(char *path)
103{
104	static char result[PATH_MAX];
105	(void)xdirname_r(path, result, sizeof(result));
106	return result;
107}
108
109#ifdef MAIN
110#include <stdlib.h>
111#include <stdio.h>
112
113int
114main(int argc, char *argv[])
115{
116	printf("%s\n", dirname(argv[1]));
117	exit(0);
118}
119#endif
120#endif
121