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 * 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 * @(#)getopt.c 8.3 (Berkeley) 4/27/95 32 * $FreeBSD: src/lib/libc/stdlib/getopt.c,v 1.8 2007/01/09 00:28:10 imp Exp $ 33 * $DragonFly: src/lib/libc/stdlib/getopt.c,v 1.7 2005/11/20 12:37:48 swildner Exp $ 34 */ 35 36 #include "namespace.h" 37 #include <stdio.h> 38 #include <stdlib.h> 39 #include <string.h> 40 #include <unistd.h> 41 #include "un-namespace.h" 42 43 #include "libc_private.h" 44 45 int opterr = 1, /* if error message should be printed */ 46 optind = 1, /* index into parent argv vector */ 47 optopt, /* character checked for validity */ 48 optreset; /* reset getopt */ 49 char *optarg; /* argument associated with option */ 50 51 #define BADCH (int)'?' 52 #define BADARG (int)':' 53 54 static char EMSG[] = { '\0' }; 55 56 /* 57 * getopt -- 58 * Parse argc/argv argument vector. 59 */ 60 int 61 getopt(int nargc, char * const nargv[], const char *ostr) 62 { 63 static char *place = EMSG; /* option letter processing */ 64 char *oli; /* option letter list index */ 65 66 /* 67 * Some programs like cvs expect optind = 0 to trigger 68 * a reset of getopt. 69 */ 70 if (optind == 0) 71 optind = 1; 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 fprintf(stderr, 105 "%s: illegal option -- %c\n", _getprogname(), 106 optopt); 107 return (BADCH); 108 } 109 110 /* Does this option need an argument? */ 111 if (oli[1] != ':') { 112 /* don't need argument */ 113 optarg = NULL; 114 if (*place == 0) 115 ++optind; 116 } else { 117 /* Option-argument is either the rest of this argument or the 118 entire next argument. */ 119 if (*place) 120 optarg = place; 121 else if (nargc > ++optind) 122 optarg = nargv[optind]; 123 else { 124 /* option-argument absent */ 125 place = EMSG; 126 if (*ostr == ':') 127 return (BADARG); 128 if (opterr) 129 fprintf(stderr, 130 "%s: option requires an argument -- %c\n", 131 _getprogname(), optopt); 132 return (BADCH); 133 } 134 place = EMSG; 135 ++optind; 136 } 137 return (optopt); /* return option letter */ 138 } 139