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 #include <errno.h>
20 #include <libgen.h>
21 #include <stdlib.h>
22 #include <string.h>
23 #include <sys/param.h>
24
25 char * __freebsd11_dirname(char *path);
26
27 char *
__freebsd11_dirname(char * path)28 __freebsd11_dirname(char *path)
29 {
30 static char *dname = NULL;
31 size_t len;
32 const char *endp;
33
34 if (dname == NULL) {
35 dname = (char *)malloc(MAXPATHLEN);
36 if (dname == NULL)
37 return(NULL);
38 }
39
40 /* Empty or NULL string gets treated as "." */
41 if (path == NULL || *path == '\0') {
42 dname[0] = '.';
43 dname[1] = '\0';
44 return (dname);
45 }
46
47 /* Strip any trailing slashes */
48 endp = path + strlen(path) - 1;
49 while (endp > path && *endp == '/')
50 endp--;
51
52 /* Find the start of the dir */
53 while (endp > path && *endp != '/')
54 endp--;
55
56 /* Either the dir is "/" or there are no slashes */
57 if (endp == path) {
58 dname[0] = *endp == '/' ? '/' : '.';
59 dname[1] = '\0';
60 return (dname);
61 } else {
62 /* Move forward past the separating slashes */
63 do {
64 endp--;
65 } while (endp > path && *endp == '/');
66 }
67
68 len = endp - path + 1;
69 if (len >= MAXPATHLEN) {
70 errno = ENAMETOOLONG;
71 return (NULL);
72 }
73 memcpy(dname, path, len);
74 dname[len] = '\0';
75 return (dname);
76 }
77
78 __sym_compat(dirname, __freebsd11_dirname, FBSD_1.0);
79