1 /* $NetBSD: getopt.c,v 1.29 2014/06/05 22:00:22 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 #if defined(LIBC_SCCS) && !defined(lint) 33 static char sccsid[] = "@(#)getopt.c 8.3 (Berkeley) 4/27/95"; 34 #endif /* LIBC_SCCS and not lint */ 35 #include <sys/cdefs.h> 36 #ifndef FSTACK 37 __FBSDID("$FreeBSD$"); 38 39 #include "namespace.h" 40 #endif 41 #include <stdio.h> 42 #include <stdlib.h> 43 #include <string.h> 44 #include <unistd.h> 45 #ifndef FSTACK 46 #include "un-namespace.h" 47 48 #include "libc_private.h" 49 #endif 50 51 int opterr = 1, /* if error message should be printed */ 52 optind = 1, /* index into parent argv vector */ 53 optopt, /* character checked for validity */ 54 optreset; /* reset getopt */ 55 char *optarg; /* argument associated with option */ 56 57 #define BADCH (int)'?' 58 #define BADARG (int)':' 59 #define EMSG "" 60 61 /* 62 * getopt -- 63 * Parse argc/argv argument vector. 64 */ 65 int 66 getopt(int nargc, char * const nargv[], const char *ostr) 67 { 68 static char *place = EMSG; /* option letter processing */ 69 char *oli; /* option letter list index */ 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 #ifndef FSTACK 104 "%s: illegal option -- %c\n", _getprogname(), 105 #else 106 "illegal option -- %c\n", 107 #endif 108 optopt); 109 return (BADCH); 110 } 111 112 /* Does this option need an argument? */ 113 if (oli[1] != ':') { 114 /* don't need argument */ 115 optarg = NULL; 116 if (*place == 0) 117 ++optind; 118 } else { 119 /* Option-argument is either the rest of this argument or the 120 entire next argument. */ 121 if (*place) 122 optarg = place; 123 else if (oli[2] == ':') 124 /* 125 * GNU Extension, for optional arguments if the rest of 126 * the argument is empty, we return NULL 127 */ 128 optarg = NULL; 129 else if (nargc > ++optind) 130 optarg = nargv[optind]; 131 else { 132 /* option-argument absent */ 133 place = EMSG; 134 if (*ostr == ':') 135 return (BADARG); 136 if (opterr) 137 (void)fprintf(stderr, 138 #ifndef FSTACK 139 "%s: option requires an argument -- %c\n", 140 _getprogname(), optopt); 141 #else 142 "option requires an argument -- %c\n", optopt); 143 #endif 144 return (BADCH); 145 } 146 place = EMSG; 147 ++optind; 148 } 149 return (optopt); /* return option letter */ 150 } 151