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 */ 34 35 #include "namespace.h" 36 #include <stdio.h> 37 #include <stdlib.h> 38 #include <string.h> 39 #include <unistd.h> 40 #include "un-namespace.h" 41 42 #include "libc_private.h" 43 44 int opterr = 1, /* if error message should be printed */ 45 optind = 1, /* index into parent argv vector */ 46 optopt, /* character checked for validity */ 47 optreset; /* reset getopt */ 48 char *optarg; /* argument associated with option */ 49 50 #define BADCH (int)'?' 51 #define BADARG (int)':' 52 53 static char EMSG[] = { '\0' }; 54 55 /* 56 * getopt -- 57 * Parse argc/argv argument vector. 58 */ 59 int 60 getopt(int nargc, char * const nargv[], const char *ostr) 61 { 62 static char *place = EMSG; /* option letter processing */ 63 char *oli; /* option letter list index */ 64 65 /* 66 * Some programs like cvs expect optind = 0 to trigger 67 * a reset of getopt. 68 */ 69 if (optind == 0) 70 optind = 1; 71 72 if (optreset || *place == 0) { /* update scanning pointer */ 73 optreset = 0; 74 place = nargv[optind]; 75 if (optind >= nargc || *place++ != '-') { 76 /* Argument is absent or is not an option */ 77 place = EMSG; 78 return (-1); 79 } 80 optopt = *place++; 81 if (optopt == '-' && *place == 0) { 82 /* "--" => end of options */ 83 ++optind; 84 place = EMSG; 85 return (-1); 86 } 87 if (optopt == 0) { 88 /* Solitary '-', treat as a '-' option 89 if the program (eg su) is looking for it. */ 90 place = EMSG; 91 if (strchr(ostr, '-') == NULL) 92 return (-1); 93 optopt = '-'; 94 } 95 } else 96 optopt = *place++; 97 98 /* See if option letter is one the caller wanted... */ 99 if (optopt == ':' || (oli = strchr(ostr, optopt)) == NULL) { 100 if (*place == 0) 101 ++optind; 102 if (opterr && *ostr != ':') 103 fprintf(stderr, 104 "%s: illegal option -- %c\n", _getprogname(), 105 optopt); 106 return (BADCH); 107 } 108 109 /* Does this option need an argument? */ 110 if (oli[1] != ':') { 111 /* don't need argument */ 112 optarg = NULL; 113 if (*place == 0) 114 ++optind; 115 } else { 116 /* Option-argument is either the rest of this argument or the 117 entire next argument. */ 118 if (*place) 119 optarg = place; 120 else if (oli[2] == ':') 121 /* 122 * GNU Extension, for optional arguments if the rest of 123 * the argument is empty, we return NULL 124 */ 125 optarg = NULL; 126 else if (nargc > ++optind) 127 optarg = nargv[optind]; 128 else { 129 /* option-argument absent */ 130 place = EMSG; 131 if (*ostr == ':') 132 return (BADARG); 133 if (opterr) 134 fprintf(stderr, 135 "%s: option requires an argument -- %c\n", 136 _getprogname(), optopt); 137 return (BADCH); 138 } 139 place = EMSG; 140 ++optind; 141 } 142 return (optopt); /* return option letter */ 143 } 144