1 /* $NetBSD: dirname.c,v 1.5 1995/03/28 16:50:12 glass 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. All advertising materials mentioning features or use of this software 16 * must display the following acknowledgement: 17 * This product includes software developed by the University of 18 * California, Berkeley and its contributors. 19 * 4. Neither the name of the University nor the names of its contributors 20 * may be used to endorse or promote products derived from this software 21 * without specific prior written permission. 22 * 23 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 24 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 25 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 26 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 27 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 28 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 29 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 30 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 31 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 32 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 33 * SUCH DAMAGE. 34 */ 35 36 #ifndef lint 37 static char copyright[] = 38 "@(#) Copyright (c) 1991, 1993, 1994\n\ 39 The Regents of the University of California. All rights reserved.\n"; 40 #endif /* not lint */ 41 42 #ifndef lint 43 #if 0 44 static char sccsid[] = "@(#)dirname.c 8.3 (Berkeley) 4/2/94"; 45 #else 46 static char rcsid[] = "$NetBSD: dirname.c,v 1.5 1995/03/28 16:50:12 glass Exp $"; 47 #endif 48 #endif /* not lint */ 49 50 #include <stdio.h> 51 #include <stdlib.h> 52 #include <locale.h> 53 54 static void usage __P((void)); 55 56 int 57 main(argc, argv) 58 int argc; 59 char **argv; 60 { 61 register char *p; 62 int ch; 63 64 setlocale(LC_ALL, ""); 65 66 while ((ch = getopt(argc, argv, "")) != -1) 67 switch(ch) { 68 case '?': 69 default: 70 usage(); 71 } 72 argc -= optind; 73 argv += optind; 74 75 if (argc != 1) 76 usage(); 77 78 /* 79 * (1) If string is //, skip steps (2) through (5). 80 * (2) If string consists entirely of slash characters, string 81 * shall be set to a single slash character. In this case, 82 * skip steps (3) through (8). 83 */ 84 for (p = *argv;; ++p) { 85 if (!*p) { 86 if (p > *argv) 87 (void)printf("/\n"); 88 else 89 (void)printf(".\n"); 90 exit(0); 91 } 92 if (*p != '/') 93 break; 94 } 95 96 /* 97 * (3) If there are any trailing slash characters in string, they 98 * shall be removed. 99 */ 100 for (; *p; ++p); 101 while (*--p == '/') 102 continue; 103 *++p = '\0'; 104 105 /* 106 * (4) If there are no slash characters remaining in string, 107 * string shall be set to a single period character. In this 108 * case skip steps (5) through (8). 109 * 110 * (5) If there are any trailing nonslash characters in string, 111 * they shall be removed. 112 */ 113 while (--p >= *argv) 114 if (*p == '/') 115 break; 116 ++p; 117 if (p == *argv) { 118 (void)printf(".\n"); 119 exit(0); 120 } 121 122 /* 123 * (6) If the remaining string is //, it is implementation defined 124 * whether steps (7) and (8) are skipped or processed. 125 * 126 * This case has already been handled, as part of steps (1) and (2). 127 */ 128 129 /* 130 * (7) If there are any trailing slash characters in string, they 131 * shall be removed. 132 */ 133 while (--p >= *argv) 134 if (*p != '/') 135 break; 136 ++p; 137 138 /* 139 * (8) If the remaining string is empty, string shall be set to 140 * a single slash character. 141 */ 142 *p = '\0'; 143 (void)printf("%s\n", p == *argv ? "/" : *argv); 144 exit(0); 145 } 146 147 static void 148 usage() 149 { 150 151 (void)fprintf(stderr, "usage: dirname path\n"); 152 exit(1); 153 } 154 155