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[] = "@(#)basename.c 5.1 (Berkeley) 3/9/91"; 42 #endif /* not lint */ 43 44 #include <stdio.h> 45 #include <stdlib.h> 46 #include <string.h> 47 48 main(argc, argv) 49 int argc; 50 char **argv; 51 { 52 extern int optind; 53 register char *p; 54 int ch; 55 56 while ((ch = getopt(argc, argv, "")) != EOF) 57 switch(ch) { 58 case '?': 59 default: 60 usage(); 61 } 62 argc -= optind; 63 argv += optind; 64 65 if (argc != 1 && argc != 2) 66 usage(); 67 68 /* 69 * (1) If string is // it is implementation defined whether steps (2) 70 * through (5) are skipped or processed. 71 * 72 * (2) If string consists entirely of slash characters, string shall 73 * be set to a single slash character. In this case, skip steps 74 * (3) through (5). 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 *++p = '\0'; 95 96 /* 97 * (4) If there are any slash characters remaining in string, the 98 * prefix of string up to an including the last slash character 99 * in string shall be removed. 100 */ 101 while (--p >= *argv) 102 if (*p == '/') 103 break; 104 ++p; 105 106 /* 107 * (5) If the suffix operand is present, is not identical to the 108 * characters remaining in string, and is identical to a suffix 109 * of the characters remaining in string, the suffix suffix 110 * shall be removed from string. 111 */ 112 if (*++argv) { 113 int suffixlen, stringlen, off; 114 115 suffixlen = strlen(*argv); 116 stringlen = strlen(p); 117 118 if (suffixlen < stringlen) { 119 off = stringlen - suffixlen; 120 if (!strcmp(p + off, *argv)) 121 p[off] = '\0'; 122 } 123 } 124 (void)printf("%s\n", p); 125 exit(0); 126 } 127 128 usage() 129 { 130 (void)fprintf(stderr, "usage: basename string [suffix]\n"); 131 exit(1); 132 } 133