1 /*- 2 * Copyright (c) 1991 The Regents of the University of California. 3 * 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 char copyright[] = 36 "@(#) Copyright (c) 1991 The Regents of the University of California.\n\ 37 All rights reserved.\n"; 38 #endif /* not lint */ 39 40 #ifndef lint 41 /*static char sccsid[] = "from: @(#)basename.c 5.1 (Berkeley) 3/9/91";*/ 42 static char rcsid[] = "$Id: basename.c,v 1.2 1993/08/01 18:18:23 mycroft Exp $"; 43 #endif /* not lint */ 44 45 #include <stdio.h> 46 #include <stdlib.h> 47 #include <string.h> 48 49 main(argc, argv) 50 int argc; 51 char **argv; 52 { 53 extern int optind; 54 register char *p; 55 int ch; 56 57 while ((ch = getopt(argc, argv, "")) != EOF) 58 switch(ch) { 59 case '?': 60 default: 61 usage(); 62 } 63 argc -= optind; 64 argv += optind; 65 66 if (argc != 1 && argc != 2) 67 usage(); 68 69 /* 70 * (1) If string is // it is implementation defined whether steps (2) 71 * through (5) are skipped or processed. 72 * 73 * (2) If string consists entirely of slash characters, string shall 74 * be set to a single slash character. In this case, skip steps 75 * (3) through (5). 76 */ 77 for (p = *argv;; ++p) { 78 if (!*p) { 79 if (p > *argv) 80 (void)printf("/\n"); 81 else 82 (void)printf("\n"); 83 exit(0); 84 } 85 if (*p != '/') 86 break; 87 } 88 89 /* 90 * (3) If there are any trailing slash characters in string, they 91 * shall be removed. 92 */ 93 for (; *p; ++p); 94 while (*--p == '/'); 95 *++p = '\0'; 96 97 /* 98 * (4) If there are any slash characters remaining in string, the 99 * prefix of string up to an including the last slash character 100 * in string shall be removed. 101 */ 102 while (--p >= *argv) 103 if (*p == '/') 104 break; 105 ++p; 106 107 /* 108 * (5) If the suffix operand is present, is not identical to the 109 * characters remaining in string, and is identical to a suffix 110 * of the characters remaining in string, the suffix suffix 111 * shall be removed from string. 112 */ 113 if (*++argv) { 114 int suffixlen, stringlen, off; 115 116 suffixlen = strlen(*argv); 117 stringlen = strlen(p); 118 119 if (suffixlen < stringlen) { 120 off = stringlen - suffixlen; 121 if (!strcmp(p + off, *argv)) 122 p[off] = '\0'; 123 } 124 } 125 (void)printf("%s\n", p); 126 exit(0); 127 } 128 129 usage() 130 { 131 (void)fprintf(stderr, "usage: basename string [suffix]\n"); 132 exit(1); 133 } 134