1267745Spfg/* $NetBSD: getopt.c,v 1.29 2014/06/05 22:00:22 christos Exp $ */ 2126696Sache 31573Srgrimes/* 41573Srgrimes * Copyright (c) 1987, 1993, 1994 51573Srgrimes * The Regents of the University of California. All rights reserved. 61573Srgrimes * 71573Srgrimes * Redistribution and use in source and binary forms, with or without 81573Srgrimes * modification, are permitted provided that the following conditions 91573Srgrimes * are met: 101573Srgrimes * 1. Redistributions of source code must retain the above copyright 111573Srgrimes * notice, this list of conditions and the following disclaimer. 121573Srgrimes * 2. Redistributions in binary form must reproduce the above copyright 131573Srgrimes * notice, this list of conditions and the following disclaimer in the 141573Srgrimes * documentation and/or other materials provided with the distribution. 15251069Semaste * 3. Neither the name of the University nor the names of its contributors 161573Srgrimes * may be used to endorse or promote products derived from this software 171573Srgrimes * without specific prior written permission. 181573Srgrimes * 191573Srgrimes * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 201573Srgrimes * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 211573Srgrimes * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 221573Srgrimes * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 231573Srgrimes * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 241573Srgrimes * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 251573Srgrimes * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 261573Srgrimes * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 271573Srgrimes * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 281573Srgrimes * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 291573Srgrimes * SUCH DAMAGE. 301573Srgrimes */ 311573Srgrimes 321573Srgrimes#if defined(LIBC_SCCS) && !defined(lint) 3323658Speterstatic char sccsid[] = "@(#)getopt.c 8.3 (Berkeley) 4/27/95"; 341573Srgrimes#endif /* LIBC_SCCS and not lint */ 3592986Sobrien#include <sys/cdefs.h> 3692986Sobrien__FBSDID("$FreeBSD: releng/11.0/lib/libc/stdlib/getopt.c 267745 2014-06-22 20:13:57Z pfg $"); 371573Srgrimes 3893399Smarkm#include "namespace.h" 391573Srgrimes#include <stdio.h> 401573Srgrimes#include <stdlib.h> 411573Srgrimes#include <string.h> 42126696Sache#include <unistd.h> 4393399Smarkm#include "un-namespace.h" 441573Srgrimes 4593399Smarkm#include "libc_private.h" 4693399Smarkm 471573Srgrimesint opterr = 1, /* if error message should be printed */ 481573Srgrimes optind = 1, /* index into parent argv vector */ 491573Srgrimes optopt, /* character checked for validity */ 501573Srgrimes optreset; /* reset getopt */ 511573Srgrimeschar *optarg; /* argument associated with option */ 521573Srgrimes 531573Srgrimes#define BADCH (int)'?' 541573Srgrimes#define BADARG (int)':' 551573Srgrimes#define EMSG "" 561573Srgrimes 571573Srgrimes/* 581573Srgrimes * getopt -- 591573Srgrimes * Parse argc/argv argument vector. 601573Srgrimes */ 611573Srgrimesint 62267745Spfggetopt(int nargc, char * const nargv[], const char *ostr) 631573Srgrimes{ 641573Srgrimes static char *place = EMSG; /* option letter processing */ 651573Srgrimes char *oli; /* option letter list index */ 661573Srgrimes 67126696Sache if (optreset || *place == 0) { /* update scanning pointer */ 681573Srgrimes optreset = 0; 69126696Sache place = nargv[optind]; 70126696Sache if (optind >= nargc || *place++ != '-') { 71126696Sache /* Argument is absent or is not an option */ 721573Srgrimes place = EMSG; 7323658Speter return (-1); 741573Srgrimes } 75126696Sache optopt = *place++; 76126696Sache if (optopt == '-' && *place == 0) { 77126696Sache /* "--" => end of options */ 781573Srgrimes ++optind; 791573Srgrimes place = EMSG; 8023658Speter return (-1); 811573Srgrimes } 82126696Sache if (optopt == 0) { 83126696Sache /* Solitary '-', treat as a '-' option 84126696Sache if the program (eg su) is looking for it. */ 85126696Sache place = EMSG; 86126696Sache if (strchr(ostr, '-') == NULL) 87126696Sache return (-1); 88126696Sache optopt = '-'; 89126696Sache } 90126696Sache } else 91126696Sache optopt = *place++; 92126696Sache 93126696Sache /* See if option letter is one the caller wanted... */ 94126696Sache if (optopt == ':' || (oli = strchr(ostr, optopt)) == NULL) { 95126696Sache if (*place == 0) 961573Srgrimes ++optind; 97126696Sache if (opterr && *ostr != ':') 98126696Sache (void)fprintf(stderr, 99126696Sache "%s: illegal option -- %c\n", _getprogname(), 100126696Sache optopt); 1011573Srgrimes return (BADCH); 1021573Srgrimes } 103126696Sache 104126696Sache /* Does this option need an argument? */ 105126696Sache if (oli[1] != ':') { 106126696Sache /* don't need argument */ 1071573Srgrimes optarg = NULL; 108126696Sache if (*place == 0) 1091573Srgrimes ++optind; 110126696Sache } else { 111126696Sache /* Option-argument is either the rest of this argument or the 112126696Sache entire next argument. */ 113126696Sache if (*place) 1141573Srgrimes optarg = place; 115267745Spfg else if (oli[2] == ':') 116267745Spfg /* 117267745Spfg * GNU Extension, for optional arguments if the rest of 118267745Spfg * the argument is empty, we return NULL 119267745Spfg */ 120267745Spfg optarg = NULL; 121126696Sache else if (nargc > ++optind) 122126696Sache optarg = nargv[optind]; 123126696Sache else { 124126696Sache /* option-argument absent */ 1251573Srgrimes place = EMSG; 1261573Srgrimes if (*ostr == ':') 12781746Sjkoshy return (BADARG); 1281573Srgrimes if (opterr) 1291573Srgrimes (void)fprintf(stderr, 1301573Srgrimes "%s: option requires an argument -- %c\n", 13193399Smarkm _getprogname(), optopt); 13281746Sjkoshy return (BADCH); 1331573Srgrimes } 1341573Srgrimes place = EMSG; 1351573Srgrimes ++optind; 1361573Srgrimes } 137126696Sache return (optopt); /* return option letter */ 1381573Srgrimes} 139