1 /* $NetBSD: basename.c,v 1.9 1995/09/02 05:29:46 jtc 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[] = "@(#)basename.c 8.4 (Berkeley) 5/4/95"; 45 #endif 46 static char rcsid[] = "$NetBSD: basename.c,v 1.9 1995/09/02 05:29:46 jtc Exp $"; 47 #endif /* not lint */ 48 49 #include <stdio.h> 50 #include <stdlib.h> 51 #include <string.h> 52 #include <locale.h> 53 #include <unistd.h> 54 55 void usage __P((void)); 56 57 int 58 main(argc, argv) 59 int argc; 60 char **argv; 61 { 62 char *p; 63 int ch; 64 65 setlocale(LC_ALL, ""); 66 67 while ((ch = getopt(argc, argv, "")) != -1) 68 switch(ch) { 69 case '?': 70 default: 71 usage(); 72 } 73 argc -= optind; 74 argv += optind; 75 76 if (argc != 1 && argc != 2) 77 usage(); 78 79 /* 80 * (1) If string is // it is implementation defined whether steps (2) 81 * through (5) are skipped or processed. 82 * 83 * (2) If string consists entirely of slash characters, string shall 84 * be set to a single slash character. In this case, skip steps 85 * (3) through (5). 86 */ 87 for (p = *argv;; ++p) { 88 if (!*p) { 89 if (p > *argv) 90 (void)printf("/\n"); 91 else 92 (void)printf("\n"); 93 exit(0); 94 } 95 if (*p != '/') 96 break; 97 } 98 99 /* 100 * (3) If there are any trailing slash characters in string, they 101 * shall be removed. 102 */ 103 for (; *p; ++p) 104 continue; 105 while (*--p == '/') 106 continue; 107 *++p = '\0'; 108 109 /* 110 * (4) If there are any slash characters remaining in string, the 111 * prefix of string up to an including the last slash character 112 * in string shall be removed. 113 */ 114 while (--p >= *argv) 115 if (*p == '/') 116 break; 117 ++p; 118 119 /* 120 * (5) If the suffix operand is present, is not identical to the 121 * characters remaining in string, and is identical to a suffix 122 * of the characters remaining in string, the suffix suffix 123 * shall be removed from string. 124 */ 125 if (*++argv) { 126 int suffixlen, stringlen, off; 127 128 suffixlen = strlen(*argv); 129 stringlen = strlen(p); 130 131 if (suffixlen < stringlen) { 132 off = stringlen - suffixlen; 133 if (!strcmp(p + off, *argv)) 134 p[off] = '\0'; 135 } 136 } 137 (void)printf("%s\n", p); 138 exit(0); 139 } 140 141 void 142 usage() 143 { 144 145 (void)fprintf(stderr, "usage: basename string [suffix]\n"); 146 exit(1); 147 } 148