Home | History | Annotate | Line # | Download | only in dirname
dirname.c revision 1.9 
      1 /*	$NetBSD: dirname.c,v 1.9 2005/02/17 17:41:34 xtraeme Exp $	*/
      2 
      3 /*-
      4  * Copyright (c) 1991, 1993, 1994
      5  *	The Regents of the University of California.  All rights reserved.
      6  *
      7  * Redistribution and use in source and binary forms, with or without
      8  * modification, are permitted provided that the following conditions
      9  * are met:
     10  * 1. Redistributions of source code must retain the above copyright
     11  *    notice, this list of conditions and the following disclaimer.
     12  * 2. Redistributions in binary form must reproduce the above copyright
     13  *    notice, this list of conditions and the following disclaimer in the
     14  *    documentation and/or other materials provided with the distribution.
     15  * 3. Neither the name of the University nor the names of its contributors
     16  *    may be used to endorse or promote products derived from this software
     17  *    without specific prior written permission.
     18  *
     19  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
     20  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
     21  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
     22  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
     23  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
     24  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
     25  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
     26  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
     27  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
     28  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
     29  * SUCH DAMAGE.
     30  */
     31 
     32 #include <sys/cdefs.h>
     33 #ifndef lint
     34 __COPYRIGHT("@(#) Copyright (c) 1991, 1993, 1994\n\
     35 	The Regents of the University of California.  All rights reserved.\n");
     36 #endif /* not lint */
     37 
     38 #ifndef lint
     39 #if 0
     40 static char sccsid[] = "@(#)dirname.c	8.4 (Berkeley) 5/4/95";
     41 #endif
     42 __RCSID("$NetBSD: dirname.c,v 1.9 2005/02/17 17:41:34 xtraeme Exp $");
     43 #endif /* not lint */
     44 
     45 #include <stdio.h>
     46 #include <stdlib.h>
     47 #include <locale.h>
     48 #include <unistd.h>
     49 
     50 static void usage(void);
     51 
     52 int
     53 main(int argc, char **argv)
     54 {
     55 	register char *p;
     56 	int ch;
     57 
     58 	setlocale(LC_ALL, "");
     59 
     60 	while ((ch = getopt(argc, argv, "")) != -1)
     61 		switch(ch) {
     62 		case '?':
     63 		default:
     64 			usage();
     65 		}
     66 	argc -= optind;
     67 	argv += optind;
     68 
     69 	if (argc != 1)
     70 		usage();
     71 
     72 	/*
     73 	 * (1) If string is //, skip steps (2) through (5).
     74 	 * (2) If string consists entirely of slash characters, string
     75 	 *     shall be set to a single slash character.  In this case,
     76 	 *     skip steps (3) through (8).
     77 	 */
     78 	for (p = *argv;; ++p) {
     79 		if (!*p) {
     80 			if (p > *argv)
     81 				(void)printf("/\n");
     82 			else
     83 				(void)printf(".\n");
     84 			exit(0);
     85 		}
     86 		if (*p != '/')
     87 			break;
     88 	}
     89 
     90 	/*
     91 	 * (3) If there are any trailing slash characters in string, they
     92 	 *     shall be removed.
     93 	 */
     94 	for (; *p; ++p);
     95 	while (*--p == '/')
     96 		continue;
     97 	*++p = '\0';
     98 
     99 	/*
    100 	 * (4) If there are no slash characters remaining in string,
    101 	 *     string shall be set to a single period character.  In this
    102 	 *     case skip steps (5) through (8).
    103 	 *
    104 	 * (5) If there are any trailing nonslash characters in string,
    105 	 *     they shall be removed.
    106 	 */
    107 	while (--p >= *argv)
    108 		if (*p == '/')
    109 			break;
    110 	++p;
    111 	if (p == *argv) {
    112 		(void)printf(".\n");
    113 		exit(0);
    114 	}
    115 
    116 	/*
    117 	 * (6) If the remaining string is //, it is implementation defined
    118 	 *     whether steps (7) and (8) are skipped or processed.
    119 	 *
    120 	 * This case has already been handled, as part of steps (1) and (2).
    121 	 */
    122 
    123 	/*
    124 	 * (7) If there are any trailing slash characters in string, they
    125 	 *     shall be removed.
    126 	 */
    127 	while (--p >= *argv)
    128 		if (*p != '/')
    129 			break;
    130 	++p;
    131 
    132 	/*
    133 	 * (8) If the remaining string is empty, string shall be set to
    134 	 *     a single slash character.
    135 	 */
    136 	*p = '\0';
    137 	(void)printf("%s\n", p == *argv ? "/" : *argv);
    138 	exit(0);
    139 }
    140 
    141 static void
    142 usage(void)
    143 {
    144 
    145 	(void)fprintf(stderr, "usage: dirname path\n");
    146 	exit(1);
    147 }
    148 
    149