1/* $NetBSD: getopt.c,v 1.27 2005/11/29 03:12:00 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#include <sys/cdefs.h> 33__RCSID("$NetBSD: getopt.c,v 1.27 2005/11/29 03:12:00 christos Exp $"); 34 35#include "namespace.h" 36 37#include <assert.h> 38#include <errno.h> 39#include <stdio.h> 40#include <stdlib.h> 41#include <string.h> 42#include <unistd.h> 43 44#ifdef __weak_alias 45__weak_alias(getopt,_getopt) 46#endif 47 48int opterr = 1, /* if error message should be printed */ 49 optind = 1, /* index into parent argv vector */ 50 optopt, /* character checked for validity */ 51 optreset; /* reset getopt */ 52char *optarg; /* argument associated with option */ 53 54#define BADCH (int)'?' 55#define BADARG (int)':' 56#define EMSG "" 57 58/* 59 * getopt -- 60 * Parse argc/argv argument vector. 61 */ 62int 63getopt(int nargc, char * const nargv[], const char *ostr) 64{ 65 static const char *place = EMSG; /* option letter processing */ 66 char *oli; /* option letter list index */ 67 68 _DIAGASSERT(nargv != NULL); 69 _DIAGASSERT(ostr != NULL); 70 71 if (optreset || *place == 0) { /* update scanning pointer */ 72 optreset = 0; 73 place = nargv[optind]; 74 if (optind >= nargc || *place++ != '-') { 75 /* Argument is absent or is not an option */ 76 place = EMSG; 77 return (-1); 78 } 79 optopt = *place++; 80 if (optopt == '-' && *place == 0) { 81 /* "--" => end of options */ 82 ++optind; 83 place = EMSG; 84 return (-1); 85 } 86 if (optopt == 0) { 87 /* Solitary '-', treat as a '-' option 88 if the program (eg su) is looking for it. */ 89 place = EMSG; 90 if (strchr(ostr, '-') == NULL) 91 return -1; 92 optopt = '-'; 93 } 94 } else 95 optopt = *place++; 96 97 /* See if option letter is one the caller wanted... */ 98 if (optopt == ':' || (oli = strchr(ostr, optopt)) == NULL) { 99 if (*place == 0) 100 ++optind; 101 if (opterr && *ostr != ':') 102 (void)fprintf(stderr, 103 "%s: unknown option -- %c\n", getprogname(), 104 optopt); 105 return (BADCH); 106 } 107 108 /* Does this option need an argument? */ 109 if (oli[1] != ':') { 110 /* don't need argument */ 111 optarg = NULL; 112 if (*place == 0) 113 ++optind; 114 } else { 115 /* Option-argument is either the rest of this argument or the 116 entire next argument. */ 117 if (*place) 118 optarg = __UNCONST(place); 119 else if (nargc > ++optind) 120 optarg = nargv[optind]; 121 else { 122 /* option-argument absent */ 123 place = EMSG; 124 if (*ostr == ':') 125 return (BADARG); 126 if (opterr) 127 (void)fprintf(stderr, 128 "%s: option requires an argument -- %c\n", 129 getprogname(), optopt); 130 return (BADCH); 131 } 132 place = EMSG; 133 ++optind; 134 } 135 return (optopt); /* return option letter */ 136} 137