1 /* $NetBSD: getopt.c,v 1.30 2024/01/19 18:41:38 christos Exp $ */ 2 3 /* 4 * Copyright (c) 1987, 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. Neither the name of the University nor the names of its contributors 16 * may be used to endorse or promote products derived from this software 17 * without specific prior written permission. 18 * 19 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 20 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 21 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 22 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 23 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 24 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 25 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 26 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 27 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 28 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 29 * SUCH DAMAGE. 30 */ 31 32 #ifdef HAVE_CONFIG_H 33 # include "config.h" 34 #endif 35 #if !defined(HAVE_GETOPT) || defined(WANT_GETOPT_LONG) || defined(BROKEN_GETOPT) 36 #include <sys/cdefs.h> 37 38 #include <stdio.h> 39 #include <stdlib.h> 40 #include <string.h> 41 42 43 #define BADCH (int)'?' 44 #define BADARG (int)':' 45 #define EMSG "" 46 47 int opterr = 1, /* if error message should be printed */ 48 optind = 1, /* index into parent argv vector */ 49 optopt = BADCH, /* character checked for validity */ 50 optreset; /* reset getopt */ 51 char *optarg; /* argument associated with option */ 52 53 /* 54 * getopt -- 55 * Parse argc/argv argument vector. 56 */ 57 int 58 getopt(int nargc, char * const nargv[], const char *ostr) 59 { 60 extern char *__progname; 61 static const char *place = EMSG; /* option letter processing */ 62 const char *oli; /* option letter list index */ 63 64 #ifndef BSD4_4 65 if (!__progname) { 66 if (__progname = strrchr(nargv[0], '/')) 67 ++__progname; 68 else 69 __progname = nargv[0]; 70 } 71 #endif 72 73 if (optreset || *place == 0) { /* update scanning pointer */ 74 optreset = 0; 75 place = nargv[optind]; 76 if (optind >= nargc || *place++ != '-') { 77 /* Argument is absent or is not an option */ 78 place = EMSG; 79 return (-1); 80 } 81 optopt = *place++; 82 if (optopt == '-' && *place == 0) { 83 /* "--" => end of options */ 84 ++optind; 85 place = EMSG; 86 return (-1); 87 } 88 if (optopt == 0) { 89 /* Solitary '-', treat as a '-' option 90 if the program (eg su) is looking for it. */ 91 place = EMSG; 92 if (strchr(ostr, '-') == NULL) 93 return -1; 94 optopt = '-'; 95 } 96 } else 97 optopt = *place++; 98 99 /* See if option letter is one the caller wanted... */ 100 if (optopt == ':' || (oli = strchr(ostr, optopt)) == NULL) { 101 if (*place == 0) 102 ++optind; 103 if (opterr && *ostr != ':') 104 (void)fprintf(stderr, 105 "%s: unknown option -- %c\n", __progname, optopt); 106 return (BADCH); 107 } 108 109 /* Does this option need an argument? */ 110 if (oli[1] != ':') { 111 /* don't need argument */ 112 optarg = NULL; 113 if (*place == 0) 114 ++optind; 115 } else { 116 /* Option-argument is either the rest of this argument or the 117 entire next argument. */ 118 if (*place) 119 optarg = __UNCONST(place); 120 else if (oli[2] == ':') 121 /* 122 * GNU Extension, for optional arguments if the rest of 123 * the argument is empty, we return NULL 124 */ 125 optarg = NULL; 126 else if (nargc > ++optind) 127 optarg = nargv[optind]; 128 else { 129 /* option-argument absent */ 130 place = EMSG; 131 if (*ostr == ':') 132 return (BADARG); 133 if (opterr) 134 (void)fprintf(stderr, 135 "%s: option requires an argument -- %c\n", 136 __progname, optopt); 137 return (BADCH); 138 } 139 place = EMSG; 140 ++optind; 141 } 142 return (optopt); /* return option letter */ 143 } 144 #endif 145 #ifdef MAIN 146 #ifndef BSD4_4 147 char *__progname; 148 #endif 149 150 int 151 main(argc, argv) 152 int argc; 153 char *argv[]; 154 { 155 int c; 156 char *opts = argv[1]; 157 158 --argc; 159 ++argv; 160 161 while ((c = getopt(argc, argv, opts)) != EOF) { 162 switch (c) { 163 case '-': 164 if (optarg) 165 printf("--%s ", optarg); 166 break; 167 case '?': 168 exit(1); 169 break; 170 default: 171 if (optarg) 172 printf("-%c %s ", c, optarg); 173 else 174 printf("-%c ", c); 175 break; 176 } 177 } 178 179 if (optind < argc) { 180 printf("-- "); 181 for (; optind < argc; ++optind) { 182 printf("%s ", argv[optind]); 183 } 184 } 185 printf("\n"); 186 exit(0); 187 } 188 #endif 189