dirname.c (7b1fac00358d75b00a83566efb93372101958cdd) dirname.c (1250db81390606572908abd88d78c1f2fa5a1832)
1/* $OpenBSD: dirname.c,v 1.13 2005/08/08 08:05:33 espie Exp $ */
1/* $OpenBSD: dirname.c,v 1.4 1999/05/30 17:10:30 espie Exp $ */
2/* $FreeBSD$ */
2
3/*
3
4/*
4 * Copyright (c) 1997, 2004 Todd C. Miller <Todd.Miller@courtesan.com>
5 * Copyright (c) 1997 Todd C. Miller <Todd.Miller@courtesan.com>
6 * All rights reserved.
5 *
7 *
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.
8 * Redistribution and use in source and binary forms, with or without
9 * modification, are permitted provided that the following conditions
10 * are met:
11 * 1. Redistributions of source code must retain the above copyright
12 * notice, this list of conditions and the following disclaimer.
13 * 2. Redistributions in binary form must reproduce the above copyright
14 * notice, this list of conditions and the following disclaimer in the
15 * documentation and/or other materials provided with the distribution.
16 * 3. The name of the author may not be used to endorse or promote products
17 * derived from this software without specific prior written permission.
9 *
18 *
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.
19 * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES,
20 * INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY
21 * AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL
22 * THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
23 * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
24 * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS;
25 * OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
26 * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
27 * OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
28 * ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
17 */
18
29 */
30
19#include <sys/cdefs.h>
20__FBSDID("$FreeBSD$");
31#ifndef lint
32static char rcsid[] = "$OpenBSD: dirname.c,v 1.4 1999/05/30 17:10:30 espie Exp $";
33#endif /* not lint */
21
22#include <errno.h>
23#include <libgen.h>
34
35#include <errno.h>
36#include <libgen.h>
24#include <stdlib.h>
25#include <string.h>
26#include <sys/param.h>
27
28char *
37#include <string.h>
38#include <sys/param.h>
39
40char *
29dirname(const char *path)
41dirname(path)
42 const char *path;
30{
43{
31 static char *dname = NULL;
32 size_t len;
33 const char *endp;
44 static char bname[MAXPATHLEN];
45 register const char *endp;
34
46
35 if (dname == NULL) {
36 dname = (char *)malloc(MAXPATHLEN);
37 if (dname == NULL)
38 return(NULL);
39 }
40
41 /* Empty or NULL string gets treated as "." */
42 if (path == NULL || *path == '\0') {
47 /* Empty or NULL string gets treated as "." */
48 if (path == NULL || *path == '\0') {
43 dname[0] = '.';
44 dname[1] = '\0';
45 return (dname);
49 (void)strcpy(bname, ".");
50 return(bname);
46 }
47
51 }
52
48 /* Strip any trailing slashes */
53 /* Strip trailing slashes */
49 endp = path + strlen(path) - 1;
50 while (endp > path && *endp == '/')
51 endp--;
52
53 /* Find the start of the dir */
54 while (endp > path && *endp != '/')
55 endp--;
56
57 /* Either the dir is "/" or there are no slashes */
58 if (endp == path) {
54 endp = path + strlen(path) - 1;
55 while (endp > path && *endp == '/')
56 endp--;
57
58 /* Find the start of the dir */
59 while (endp > path && *endp != '/')
60 endp--;
61
62 /* Either the dir is "/" or there are no slashes */
63 if (endp == path) {
59 dname[0] = *endp == '/' ? '/' : '.';
60 dname[1] = '\0';
61 return (dname);
64 (void)strcpy(bname, *endp == '/' ? "/" : ".");
65 return(bname);
62 } else {
66 } else {
63 /* Move forward past the separating slashes */
64 do {
65 endp--;
66 } while (endp > path && *endp == '/');
67 }
68
67 do {
68 endp--;
69 } while (endp > path && *endp == '/');
70 }
71
69 len = endp - path + 1;
70 if (len >= MAXPATHLEN) {
72 if (endp - path + 1 > sizeof(bname)) {
71 errno = ENAMETOOLONG;
73 errno = ENAMETOOLONG;
72 return (NULL);
74 return(NULL);
73 }
75 }
74 memcpy(dname, path, len);
75 dname[len] = '\0';
76 return (dname);
76 (void)strncpy(bname, path, endp - path + 1);
77 bname[endp - path + 1] = '\0';
78 return(bname);
77}
79}