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 #else 50 #include "compat.h" 51 #endif 52 53 int opterr = 1, /* if error message should be printed */ 54 optind = 1, /* index into parent argv vector */ 55 optopt, /* character checked for validity */ 56 optreset; /* reset getopt */ 57 char *optarg; /* argument associated with option */ 58 59 #define BADCH (int)'?' 60 #define BADARG (int)':' 61 #define EMSG "" 62 63 /* 64 * getopt -- 65 * Parse argc/argv argument vector. 66 */ 67 int 68 getopt(int nargc, char * const nargv[], const char *ostr) 69 { 70 static char *place = EMSG; /* option letter processing */ 71 char *oli; /* option letter list index */ 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 (void)fprintf(stderr, 105 #ifndef FSTACK 106 "%s: illegal option -- %c\n", _getprogname(), 107 #else 108 "%s: illegal option -- %c\n", getprogname(), 109 #endif 110 optopt); 111 return (BADCH); 112 } 113 114 /* Does this option need an argument? */ 115 if (oli[1] != ':') { 116 /* don't need argument */ 117 optarg = NULL; 118 if (*place == 0) 119 ++optind; 120 } else { 121 /* Option-argument is either the rest of this argument or the 122 entire next argument. */ 123 if (*place) 124 optarg = place; 125 else if (oli[2] == ':') 126 /* 127 * GNU Extension, for optional arguments if the rest of 128 * the argument is empty, we return NULL 129 */ 130 optarg = NULL; 131 else if (nargc > ++optind) 132 optarg = nargv[optind]; 133 else { 134 /* option-argument absent */ 135 place = EMSG; 136 if (*ostr == ':') 137 return (BADARG); 138 if (opterr) 139 (void)fprintf(stderr, 140 #ifndef FSTACK 141 "%s: option requires an argument -- %c\n", 142 _getprogname(), optopt); 143 #else 144 "%s: option requires an argument -- %c\n", 145 getprogname(), optopt); 146 #endif 147 return (BADCH); 148 } 149 place = EMSG; 150 ++optind; 151 } 152 return (optopt); /* return option letter */ 153 } 154