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 const 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 const char sccsid[] = "@(#)basename.c 8.4 (Berkeley) 5/4/95"; 42 #endif /* not lint */ 43 44 #include <stdio.h> 45 #include <stdlib.h> 46 #include <string.h> 47 #include <unistd.h> 48 49 void usage __P((void)); 50 51 int 52 main(argc, argv) 53 int argc; 54 char **argv; 55 { 56 char *p; 57 int ch; 58 59 while ((ch = getopt(argc, argv, "")) != -1) 60 switch(ch) { 61 case '?': 62 default: 63 usage(); 64 } 65 argc -= optind; 66 argv += optind; 67 68 if (argc != 1 && argc != 2) 69 usage(); 70 71 /* 72 * (1) If string is // it is implementation defined whether steps (2) 73 * through (5) are skipped or processed. 74 * 75 * (2) If string consists entirely of slash characters, string shall 76 * be set to a single slash character. In this case, skip steps 77 * (3) through (5). 78 */ 79 for (p = *argv;; ++p) { 80 if (!*p) { 81 if (p > *argv) 82 (void)printf("/\n"); 83 else 84 (void)printf("\n"); 85 exit(0); 86 } 87 if (*p != '/') 88 break; 89 } 90 91 /* 92 * (3) If there are any trailing slash characters in string, they 93 * shall be removed. 94 */ 95 for (; *p; ++p) 96 continue; 97 while (*--p == '/') 98 continue; 99 *++p = '\0'; 100 101 /* 102 * (4) If there are any slash characters remaining in string, the 103 * prefix of string up to an including the last slash character 104 * in string shall be removed. 105 */ 106 while (--p >= *argv) 107 if (*p == '/') 108 break; 109 ++p; 110 111 /* 112 * (5) If the suffix operand is present, is not identical to the 113 * characters remaining in string, and is identical to a suffix 114 * of the characters remaining in string, the suffix suffix 115 * shall be removed from string. 116 */ 117 if (*++argv) { 118 int suffixlen, stringlen, off; 119 120 suffixlen = strlen(*argv); 121 stringlen = strlen(p); 122 123 if (suffixlen < stringlen) { 124 off = stringlen - suffixlen; 125 if (!strcmp(p + off, *argv)) 126 p[off] = '\0'; 127 } 128 } 129 (void)printf("%s\n", p); 130 exit(0); 131 } 132 133 void 134 usage() 135 { 136 137 (void)fprintf(stderr, "usage: basename string [suffix]\n"); 138 exit(1); 139 } 140