1/*	$OpenBSD: basename.c,v 1.14 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#include <sys/cdefs.h>
20__FBSDID("$FreeBSD$");
21
22#include <errno.h>
23#include <libgen.h>
24#include <stdlib.h>
25#include <string.h>
26#include <sys/param.h>
27
28char * __freebsd11_basename_r(const char *path, char *bname);
29char * __freebsd11_basename(char *path);
30
31char *
32__freebsd11_basename_r(const char *path, char *bname)
33{
34	const char *endp, *startp;
35	size_t len;
36
37	/* Empty or NULL string gets treated as "." */
38	if (path == NULL || *path == '\0') {
39		bname[0] = '.';
40		bname[1] = '\0';
41		return (bname);
42	}
43
44	/* Strip any trailing slashes */
45	endp = path + strlen(path) - 1;
46	while (endp > path && *endp == '/')
47		endp--;
48
49	/* All slashes becomes "/" */
50	if (endp == path && *endp == '/') {
51		bname[0] = '/';
52		bname[1] = '\0';
53		return (bname);
54	}
55
56	/* Find the start of the base */
57	startp = endp;
58	while (startp > path && *(startp - 1) != '/')
59		startp--;
60
61	len = endp - startp + 1;
62	if (len >= MAXPATHLEN) {
63		errno = ENAMETOOLONG;
64		return (NULL);
65	}
66	memcpy(bname, startp, len);
67	bname[len] = '\0';
68	return (bname);
69}
70
71char *
72__freebsd11_basename(char *path)
73{
74	static char *bname = NULL;
75
76	if (bname == NULL) {
77		bname = (char *)malloc(MAXPATHLEN);
78		if (bname == NULL)
79			return (NULL);
80	}
81	return (__freebsd11_basename_r(path, bname));
82}
83
84__sym_compat(basename_r, __freebsd11_basename_r, FBSD_1.2);
85__sym_compat(basename, __freebsd11_basename, FBSD_1.0);
86