1/* $Id: getopt.c 276 2010-06-30 12:18:30Z nijtmans $ */ 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#if 0 33static char sccsid[] = "@(#)getopt.c 8.3 (Berkeley) 4/27/95"; 34__RCSID("$NetBSD: getopt.c,v 1.26 2003/08/07 16:43:40 agc Exp $"); 35#endif 36 37#include <stdio.h> 38#include <string.h> 39 40int opterr = 1, /* if error message should be printed */ 41 optind = 1, /* index into parent argv vector */ 42 optopt, /* character checked for validity */ 43 optreset; /* reset getopt */ 44char *optarg; /* argument associated with option */ 45 46#define BADCH (int)'?' 47#define BADARG (int)':' 48#define EMSG "" 49 50/* 51 * getopt -- 52 * Parse argc/argv argument vector. 53 */ 54int 55getopt(int argc, char * const argv[], const char *optstring) 56{ 57 static char *place = EMSG; /* option letter processing */ 58 char *oli; /* option letter list index */ 59 60 if (optreset || *place == 0) { /* update scanning pointer */ 61 optreset = 0; 62 place = argv[optind]; 63 if (optind >= argc || *place++ != '-') { 64 /* Argument is absent or is not an option */ 65 place = EMSG; 66 return (-1); 67 } 68 optopt = *place++; 69 if (optopt == '-' && *place == 0) { 70 /* "--" => end of options */ 71 ++optind; 72 place = EMSG; 73 return (-1); 74 } 75 if (optopt == 0) { 76 /* Solitary '-', treat as a '-' option 77 if the program (eg su) is looking for it. */ 78 place = EMSG; 79 if (strchr(optstring, '-') == NULL) 80 return -1; 81 optopt = '-'; 82 } 83 } else 84 optopt = *place++; 85 86 /* See if option letter is one the caller wanted... */ 87 if (optopt == ':' || (oli = strchr(optstring, optopt)) == NULL) { 88 if (*place == 0) 89 ++optind; 90 if (opterr && *optstring != ':') 91 (void)fprintf(stderr, 92 "unknown option -- %c\n", optopt); 93 return (BADCH); 94 } 95 96 /* Does this option need an argument? */ 97 if (oli[1] != ':') { 98 /* don't need argument */ 99 optarg = NULL; 100 if (*place == 0) 101 ++optind; 102 } else { 103 /* Option-argument is either the rest of this argument or the 104 entire next argument. */ 105 if (*place) 106 optarg = place; 107 else if (argc > ++optind) 108 optarg = argv[optind]; 109 else { 110 /* option-argument absent */ 111 place = EMSG; 112 if (*optstring == ':') 113 return (BADARG); 114 if (opterr) 115 (void)fprintf(stderr, 116 "option requires an argument -- %c\n", 117 optopt); 118 return (BADCH); 119 } 120 place = EMSG; 121 ++optind; 122 } 123 return (optopt); /* return option letter */ 124} 125/* 126 * Local Variables: 127 * mode: c 128 * c-basic-offset: 8 129 * fill-column: 78 130 * End: 131 */ 132