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1 /*
2 * Copyright (c) 1997 Todd C. Miller <Todd.Miller@courtesan.com>
3 * All rights reserved.
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
7 * are met:
8 * 1. Redistributions of source code must retain the above copyright
9 * notice, this list of conditions and the following disclaimer.
10 * 2. Redistributions in binary form must reproduce the above copyright
11 * notice, this list of conditions and the following disclaimer in the
12 * documentation and/or other materials provided with the distribution.
13 * 3. The name of the author may not be used to endorse or promote products
14 * derived from this software without specific prior written permission.
15 *
16 * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES,
17 * INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY
18 * AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL
19 * THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
20 * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
21 * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS;
22 * OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
23 * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
24 * OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
25 * ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
26 */
27
28 #if 0
29 #ifndef lint
30 static char rcsid[] = "$OpenBSD: dirname.c,v 1.4 1999/05/30 17:10:30 espie Exp $";
31 #endif /* not lint */
32 #endif
33 #include <sys/cdefs.h>
34 __FBSDID("$FreeBSD: src/lib/libc/gen/dirname.c,v 1.7 2002/12/30 01:41:14 marcel Exp $");
35
36 #include <errno.h>
37 #include <libgen.h>
38 #include <stdlib.h>
39 #include <string.h>
40 #include <sys/param.h>
41
42 char *
43 dirname(path)
44 const char *path;
45 {
46 static char *bname = NULL;
47 const char *endp;
48
49 if (bname == NULL) {
50 bname = (char *)malloc(MAXPATHLEN);
51 if (bname == NULL)
52 return(NULL);
53 }
54
55 /* Empty or NULL string gets treated as "." */
56 if (path == NULL || *path == '\0') {
57 (void)strcpy(bname, ".");
58 return(bname);
59 }
60
61 /* Strip trailing slashes */
62 endp = path + strlen(path) - 1;
63 while (endp > path && *endp == '/')
64 endp--;
65
66 /* Find the start of the dir */
67 while (endp > path && *endp != '/')
68 endp--;
69
70 /* Either the dir is "/" or there are no slashes */
71 if (endp == path) {
72 (void)strcpy(bname, *endp == '/' ? "/" : ".");
73 return(bname);
74 } else {
75 do {
76 endp--;
77 } while (endp > path && *endp == '/');
78 }
79
80 if (endp - path + 2 > MAXPATHLEN) {
81 errno = ENAMETOOLONG;
82 return(NULL);
83 }
84 (void)strncpy(bname, path, endp - path + 1);
85 bname[endp - path + 1] = '\0';
86 return(bname);
87 }