1/*	$OpenBSD: dirname.c,v 1.13 2005/08/08 08:05:33 espie Exp $	*/
2
3/*
4 * Copyright (c) 1997, 2004 Todd C. Miller <Todd.Miller@courtesan.com>
5 *
6 * Permission to use, copy, modify, and distribute this software for any
7 * purpose with or without fee is hereby granted, provided that the above
8 * copyright notice and this permission notice appear in all copies.
9 *
10 * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
11 * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
12 * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
13 * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
14 * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
15 * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
16 * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
17 */
18
19/* OPENBSD ORIGINAL: lib/libc/gen/dirname.c */
20
21#include "includes.h"
22#ifndef HAVE_DIRNAME
23
24#include <errno.h>
25#include <string.h>
26#include <sys/param.h>
27
28char *
29dirname(const char *path)
30{
31	static char dname[MAXPATHLEN];
32	size_t len;
33	const char *endp;
34
35	/* Empty or NULL string gets treated as "." */
36	if (path == NULL || *path == '\0') {
37		dname[0] = '.';
38		dname[1] = '\0';
39		return (dname);
40	}
41
42	/* Strip any trailing slashes */
43	endp = path + strlen(path) - 1;
44	while (endp > path && *endp == '/')
45		endp--;
46
47	/* Find the start of the dir */
48	while (endp > path && *endp != '/')
49		endp--;
50
51	/* Either the dir is "/" or there are no slashes */
52	if (endp == path) {
53		dname[0] = *endp == '/' ? '/' : '.';
54		dname[1] = '\0';
55		return (dname);
56	} else {
57		/* Move forward past the separating slashes */
58		do {
59			endp--;
60		} while (endp > path && *endp == '/');
61	}
62
63	len = endp - path + 1;
64	if (len >= sizeof(dname)) {
65		errno = ENAMETOOLONG;
66		return (NULL);
67	}
68	memcpy(dname, path, len);
69	dname[len] = '\0';
70	return (dname);
71}
72#endif
73