dsniff  2.4b2
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dirname.c
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1 /* $Id: dirname.c,v 1.1 2000/04/08 20:50:28 dugsong Exp $ */
2 /* $OpenBSD: dirname.c,v 1.4 1999/05/30 17:10:30 espie Exp $ */
3 
4 /*
5  * Copyright (c) 1997 Todd C. Miller <Todd.Miller@courtesan.com>
6  * All rights reserved.
7  *
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.
18  *
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.
29  */
30 
31 #include <errno.h>
32 #include <string.h>
33 #include <sys/param.h>
34 
35 char *
36 dirname(path)
37  const char *path;
38 {
39  static char bname[MAXPATHLEN];
40  register const char *endp;
41 
42  /* Empty or NULL string gets treated as "." */
43  if (path == NULL || *path == '\0') {
44  (void)strcpy(bname, ".");
45  return(bname);
46  }
47 
48  /* 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) {
59  (void)strcpy(bname, *endp == '/' ? "/" : ".");
60  return(bname);
61  } else {
62  do {
63  endp--;
64  } while (endp > path && *endp == '/');
65  }
66 
67  if (endp - path + 1 > sizeof(bname)) {
68  errno = ENAMETOOLONG;
69  return(NULL);
70  }
71  (void)strncpy(bname, path, endp - path + 1);
72  bname[endp - path + 1] = '\0';
73  return(bname);
74 }
dirname
char * dirname(char *path) const
Definition: dirname.c:36