145 lines
3.9 KiB
C
145 lines
3.9 KiB
C
/*-
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* Copyright (c) 1991, 1993, 1994
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* The Regents of the University of California. All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. All advertising materials mentioning features or use of this software
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* must display the following acknowledgement:
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* This product includes software developed by the University of
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* California, Berkeley and its contributors.
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* 4. Neither the name of the University nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*/
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#ifndef lint
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static char copyright[] =
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"@(#) Copyright (c) 1991, 1993, 1994\n\
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The Regents of the University of California. All rights reserved.\n";
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#endif /* not lint */
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#ifndef lint
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static char sccsid[] = "@(#)dirname.c 8.3 (Berkeley) 4/2/94";
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#endif /* not lint */
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#include <stdio.h>
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#include <stdlib.h>
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void usage __P((void));
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int
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main(argc, argv)
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int argc;
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char **argv;
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{
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char *p;
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int ch;
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while ((ch = getopt(argc, argv, "")) != EOF)
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switch(ch) {
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case '?':
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default:
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usage();
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}
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argc -= optind;
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argv += optind;
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if (argc != 1)
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usage();
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/*
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* (1) If string is //, skip steps (2) through (5).
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* (2) If string consists entirely of slash characters, string
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* shall be set to a single slash character. In this case,
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* skip steps (3) through (8).
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*/
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for (p = *argv;; ++p) {
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if (!*p) {
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if (p > *argv)
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(void)printf("/\n");
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else
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(void)printf(".\n");
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exit(0);
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}
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if (*p != '/')
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break;
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}
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/*
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* (3) If there are any trailing slash characters in string, they
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* shall be removed.
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*/
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for (; *p; ++p);
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while (*--p == '/')
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continue;
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*++p = '\0';
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/*
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* (4) If there are no slash characters remaining in string,
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* string shall be set to a single period character. In this
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* case skip steps (5) through (8).
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*
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* (5) If there are any trailing nonslash characters in string,
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* they shall be removed.
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*/
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while (--p >= *argv)
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if (*p == '/')
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break;
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++p;
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if (p == *argv) {
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(void)printf(".\n");
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exit(0);
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}
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/*
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* (6) If the remaining string is //, it is implementation defined
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* whether steps (7) and (8) are skipped or processed.
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*
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* This case has already been handled, as part of steps (1) and (2).
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*/
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/*
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* (7) If there are any trailing slash characters in string, they
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* shall be removed.
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*/
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while (--p >= *argv)
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if (*p != '/')
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break;
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++p;
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/*
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* (8) If the remaining string is empty, string shall be set to
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* a single slash character.
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*/
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*p = '\0';
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(void)printf("%s\n", p == *argv ? "/" : *argv);
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exit(0);
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}
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void
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usage()
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{
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(void)fprintf(stderr, "usage: dirname path\n");
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exit(1);
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}
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