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- /* $Id: dirname.c,v 1.1 2000/04/08 20:50:28 dugsong Exp $ */
- /* $OpenBSD: dirname.c,v 1.4 1999/05/30 17:10:30 espie Exp $ */
-
- /*
- * Copyright (c) 1997 Todd C. Miller <Todd.Miller@courtesan.com>
- * All rights reserved.
- *
- * Redistribution and use in source and binary forms, with or without
- * modification, are permitted provided that the following conditions
- * are met:
- * 1. Redistributions of source code must retain the above copyright
- * notice, this list of conditions and the following disclaimer.
- * 2. Redistributions in binary form must reproduce the above copyright
- * notice, this list of conditions and the following disclaimer in the
- * documentation and/or other materials provided with the distribution.
- * 3. The name of the author may not be used to endorse or promote products
- * derived from this software without specific prior written permission.
- *
- * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES,
- * INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY
- * AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL
- * THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
- * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
- * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS;
- * OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
- * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
- * OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
- * ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
- */
-
- #include <errno.h>
- #include <string.h>
- #include <sys/param.h>
-
- char *
- dirname(path)
- const char *path;
- {
- static char bname[MAXPATHLEN];
- register const char *endp;
-
- /* Empty or NULL string gets treated as "." */
- if (path == NULL || *path == '\0') {
- (void)strcpy(bname, ".");
- return(bname);
- }
-
- /* Strip trailing slashes */
- endp = path + strlen(path) - 1;
- while (endp > path && *endp == '/')
- endp--;
-
- /* Find the start of the dir */
- while (endp > path && *endp != '/')
- endp--;
-
- /* Either the dir is "/" or there are no slashes */
- if (endp == path) {
- (void)strcpy(bname, *endp == '/' ? "/" : ".");
- return(bname);
- } else {
- do {
- endp--;
- } while (endp > path && *endp == '/');
- }
-
- if (endp - path + 1 > sizeof(bname)) {
- errno = ENAMETOOLONG;
- return(NULL);
- }
- (void)strncpy(bname, path, endp - path + 1);
- bname[endp - path + 1] = '\0';
- return(bname);
- }
-