146 lines
3.9 KiB
C
146 lines
3.9 KiB
C
/*-
|
|
* Copyright (c) 1991, 1993, 1994
|
|
* The Regents of the University of California. 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. All advertising materials mentioning features or use of this software
|
|
* must display the following acknowledgement:
|
|
* This product includes software developed by the University of
|
|
* California, Berkeley and its contributors.
|
|
* 4. Neither the name of the University nor the names of its contributors
|
|
* may be used to endorse or promote products derived from this software
|
|
* without specific prior written permission.
|
|
*
|
|
* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``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 REGENTS OR CONTRIBUTORS 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.
|
|
*/
|
|
|
|
#ifndef lint
|
|
static char copyright[] =
|
|
"@(#) Copyright (c) 1991, 1993, 1994\n\
|
|
The Regents of the University of California. All rights reserved.\n";
|
|
#endif /* not lint */
|
|
|
|
#ifndef lint
|
|
static char sccsid[] = "@(#)dirname.c 8.4 (Berkeley) 5/4/95";
|
|
#endif /* not lint */
|
|
|
|
#include <stdio.h>
|
|
#include <stdlib.h>
|
|
#include <unistd.h>
|
|
|
|
void usage __P((void));
|
|
|
|
int
|
|
main(argc, argv)
|
|
int argc;
|
|
char **argv;
|
|
{
|
|
char *p;
|
|
int ch;
|
|
|
|
while ((ch = getopt(argc, argv, "")) != -1)
|
|
switch(ch) {
|
|
case '?':
|
|
default:
|
|
usage();
|
|
}
|
|
argc -= optind;
|
|
argv += optind;
|
|
|
|
if (argc != 1)
|
|
usage();
|
|
|
|
/*
|
|
* (1) If string is //, skip steps (2) through (5).
|
|
* (2) If string consists entirely of slash characters, string
|
|
* shall be set to a single slash character. In this case,
|
|
* skip steps (3) through (8).
|
|
*/
|
|
for (p = *argv;; ++p) {
|
|
if (!*p) {
|
|
if (p > *argv)
|
|
(void)printf("/\n");
|
|
else
|
|
(void)printf(".\n");
|
|
exit(0);
|
|
}
|
|
if (*p != '/')
|
|
break;
|
|
}
|
|
|
|
/*
|
|
* (3) If there are any trailing slash characters in string, they
|
|
* shall be removed.
|
|
*/
|
|
for (; *p; ++p);
|
|
while (*--p == '/')
|
|
continue;
|
|
*++p = '\0';
|
|
|
|
/*
|
|
* (4) If there are no slash characters remaining in string,
|
|
* string shall be set to a single period character. In this
|
|
* case skip steps (5) through (8).
|
|
*
|
|
* (5) If there are any trailing nonslash characters in string,
|
|
* they shall be removed.
|
|
*/
|
|
while (--p >= *argv)
|
|
if (*p == '/')
|
|
break;
|
|
++p;
|
|
if (p == *argv) {
|
|
(void)printf(".\n");
|
|
exit(0);
|
|
}
|
|
|
|
/*
|
|
* (6) If the remaining string is //, it is implementation defined
|
|
* whether steps (7) and (8) are skipped or processed.
|
|
*
|
|
* This case has already been handled, as part of steps (1) and (2).
|
|
*/
|
|
|
|
/*
|
|
* (7) If there are any trailing slash characters in string, they
|
|
* shall be removed.
|
|
*/
|
|
while (--p >= *argv)
|
|
if (*p != '/')
|
|
break;
|
|
++p;
|
|
|
|
/*
|
|
* (8) If the remaining string is empty, string shall be set to
|
|
* a single slash character.
|
|
*/
|
|
*p = '\0';
|
|
(void)printf("%s\n", p == *argv ? "/" : *argv);
|
|
exit(0);
|
|
}
|
|
|
|
void
|
|
usage()
|
|
{
|
|
|
|
(void)fprintf(stderr, "usage: dirname path\n");
|
|
exit(1);
|
|
}
|