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
28 char *
dirname(const char * path)29 dirname(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