1*0Sstevel@tonic-gate /* $OpenBSD: dirname.c,v 1.7 2002/05/24 21:22:37 deraadt Exp $ */
2*0Sstevel@tonic-gate
3*0Sstevel@tonic-gate /*
4*0Sstevel@tonic-gate * Copyright (c) 1997 Todd C. Miller <Todd.Miller@courtesan.com>
5*0Sstevel@tonic-gate * All rights reserved.
6*0Sstevel@tonic-gate *
7*0Sstevel@tonic-gate * Redistribution and use in source and binary forms, with or without
8*0Sstevel@tonic-gate * modification, are permitted provided that the following conditions
9*0Sstevel@tonic-gate * are met:
10*0Sstevel@tonic-gate * 1. Redistributions of source code must retain the above copyright
11*0Sstevel@tonic-gate * notice, this list of conditions and the following disclaimer.
12*0Sstevel@tonic-gate * 2. Redistributions in binary form must reproduce the above copyright
13*0Sstevel@tonic-gate * notice, this list of conditions and the following disclaimer in the
14*0Sstevel@tonic-gate * documentation and/or other materials provided with the distribution.
15*0Sstevel@tonic-gate * 3. The name of the author may not be used to endorse or promote products
16*0Sstevel@tonic-gate * derived from this software without specific prior written permission.
17*0Sstevel@tonic-gate *
18*0Sstevel@tonic-gate * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES,
19*0Sstevel@tonic-gate * INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY
20*0Sstevel@tonic-gate * AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL
21*0Sstevel@tonic-gate * THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
22*0Sstevel@tonic-gate * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
23*0Sstevel@tonic-gate * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS;
24*0Sstevel@tonic-gate * OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
25*0Sstevel@tonic-gate * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
26*0Sstevel@tonic-gate * OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
27*0Sstevel@tonic-gate * ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
28*0Sstevel@tonic-gate */
29*0Sstevel@tonic-gate
30*0Sstevel@tonic-gate #include "includes.h"
31*0Sstevel@tonic-gate #ifndef HAVE_DIRNAME
32*0Sstevel@tonic-gate
33*0Sstevel@tonic-gate #if defined(LIBC_SCCS) && !defined(lint)
34*0Sstevel@tonic-gate static char rcsid[] = "$OpenBSD: dirname.c,v 1.7 2002/05/24 21:22:37 deraadt Exp $";
35*0Sstevel@tonic-gate #endif /* LIBC_SCCS and not lint */
36*0Sstevel@tonic-gate
37*0Sstevel@tonic-gate #include <errno.h>
38*0Sstevel@tonic-gate #include <string.h>
39*0Sstevel@tonic-gate #include <sys/param.h>
40*0Sstevel@tonic-gate
41*0Sstevel@tonic-gate char *
dirname(path)42*0Sstevel@tonic-gate dirname(path)
43*0Sstevel@tonic-gate const char *path;
44*0Sstevel@tonic-gate {
45*0Sstevel@tonic-gate static char bname[MAXPATHLEN];
46*0Sstevel@tonic-gate register const char *endp;
47*0Sstevel@tonic-gate
48*0Sstevel@tonic-gate /* Empty or NULL string gets treated as "." */
49*0Sstevel@tonic-gate if (path == NULL || *path == '\0') {
50*0Sstevel@tonic-gate (void)strlcpy(bname, ".", sizeof bname);
51*0Sstevel@tonic-gate return(bname);
52*0Sstevel@tonic-gate }
53*0Sstevel@tonic-gate
54*0Sstevel@tonic-gate /* Strip trailing slashes */
55*0Sstevel@tonic-gate endp = path + strlen(path) - 1;
56*0Sstevel@tonic-gate while (endp > path && *endp == '/')
57*0Sstevel@tonic-gate endp--;
58*0Sstevel@tonic-gate
59*0Sstevel@tonic-gate /* Find the start of the dir */
60*0Sstevel@tonic-gate while (endp > path && *endp != '/')
61*0Sstevel@tonic-gate endp--;
62*0Sstevel@tonic-gate
63*0Sstevel@tonic-gate /* Either the dir is "/" or there are no slashes */
64*0Sstevel@tonic-gate if (endp == path) {
65*0Sstevel@tonic-gate (void)strlcpy(bname, *endp == '/' ? "/" : ".", sizeof bname);
66*0Sstevel@tonic-gate return(bname);
67*0Sstevel@tonic-gate } else {
68*0Sstevel@tonic-gate do {
69*0Sstevel@tonic-gate endp--;
70*0Sstevel@tonic-gate } while (endp > path && *endp == '/');
71*0Sstevel@tonic-gate }
72*0Sstevel@tonic-gate
73*0Sstevel@tonic-gate if (endp - path + 2 > sizeof(bname)) {
74*0Sstevel@tonic-gate errno = ENAMETOOLONG;
75*0Sstevel@tonic-gate return(NULL);
76*0Sstevel@tonic-gate }
77*0Sstevel@tonic-gate strlcpy(bname, path, endp - path + 2);
78*0Sstevel@tonic-gate return(bname);
79*0Sstevel@tonic-gate }
80*0Sstevel@tonic-gate #endif
81*0Sstevel@tonic-gate
82*0Sstevel@tonic-gate #pragma ident "%Z%%M% %I% %E% SMI"
83