1/* $NetBSD: getopt.c,v 1.26 2003/08/07 16:43:40 agc 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 * 4. 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 defined(LIBC_SCCS) && !defined(lint) 33static char sccsid[] = "@(#)getopt.c 8.3 (Berkeley) 4/27/95"; 34#endif /* LIBC_SCCS and not lint */ 35#include <sys/cdefs.h> 36__FBSDID("$FreeBSD: src/lib/libc/stdlib/getopt.c,v 1.8 2007/01/09 00:28:10 imp Exp $"); 37 38#include "namespace.h" 39#include <stdio.h> 40#include <stdlib.h> 41#include <string.h> 42#include <unistd.h> 43#include "un-namespace.h" 44 45#include "libc_private.h" 46 47#ifndef BUILDING_VARIANT 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#endif /* !BUILDING_VARIANT */ 54 55#define BADCH (int)'?' 56#define BADARG (int)':' 57#define EMSG "" 58 59#if __DARWIN_UNIX03 60#define PROGNAME nargv[0] 61#else 62#define PROGNAME _getprogname() 63#endif 64 65/* 66 * getopt -- 67 * Parse argc/argv argument vector. 68 */ 69int 70getopt(nargc, nargv, ostr) 71 int nargc; 72 char * const nargv[]; 73 const char *ostr; 74{ 75 static char *place = EMSG; /* option letter processing */ 76 char *oli; /* option letter list index */ 77 78 if (optreset || *place == 0) { /* update scanning pointer */ 79 optreset = 0; 80 place = nargv[optind]; 81 if (optind >= nargc || *place++ != '-') { 82 /* Argument is absent or is not an option */ 83 place = EMSG; 84 return (-1); 85 } 86 optopt = *place++; 87 if (optopt == '-' && *place == 0) { 88 /* "--" => end of options */ 89 ++optind; 90 place = EMSG; 91 return (-1); 92 } 93 if (optopt == 0) { 94 /* Solitary '-', treat as a '-' option 95 if the program (eg su) is looking for it. */ 96 place = EMSG; 97 if (strchr(ostr, '-') == NULL) 98 return (-1); 99 optopt = '-'; 100 } 101 } else 102 optopt = *place++; 103 104 /* See if option letter is one the caller wanted... */ 105 if (optopt == ':' || (oli = strchr(ostr, optopt)) == NULL) { 106 if (*place == 0) 107 ++optind; 108 if (opterr && *ostr != ':') 109 (void)fprintf(stderr, 110 "%s: illegal option -- %c\n", 111 PROGNAME, optopt); 112 return (BADCH); 113 } 114 115 /* Does this option need an argument? */ 116 if (oli[1] != ':') { 117 /* don't need argument */ 118 optarg = NULL; 119 if (*place == 0) 120 ++optind; 121 } else { 122 /* Option-argument is either the rest of this argument or the 123 entire next argument. */ 124 if (*place) 125 optarg = place; 126 else if (nargc > ++optind) 127 optarg = nargv[optind]; 128 else { 129 /* option-argument absent */ 130#if __DARWIN_UNIX03 131 /* Yes, the standard will put optind past the last 132 argument */ 133 ++optind; 134 optarg = NULL; 135#endif /* __DARWIN_UNIX03 */ 136 place = EMSG; 137 if (*ostr == ':') 138 return (BADARG); 139 if (opterr) 140 (void)fprintf(stderr, 141 "%s: option requires an argument -- %c\n", 142 PROGNAME, optopt); 143 return (BADCH); 144 } 145 place = EMSG; 146 ++optind; 147 } 148 return (optopt); /* return option letter */ 149} 150