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