1 /* $NetBSD: getopt.c,v 1.29 2014/06/05 22:00:22 christos Exp $ */ 2 3 /*- 4 * SPDX-License-Identifier: BSD-3-Clause 5 * 6 * Copyright (c) 1987, 1993, 1994 7 * The Regents of the University of California. All rights reserved. 8 * 9 * Redistribution and use in source and binary forms, with or without 10 * modification, are permitted provided that the following conditions 11 * are met: 12 * 1. Redistributions of source code must retain the above copyright 13 * notice, this list of conditions and the following disclaimer. 14 * 2. Redistributions in binary form must reproduce the above copyright 15 * notice, this list of conditions and the following disclaimer in the 16 * documentation and/or other materials provided with the distribution. 17 * 3. Neither the name of the University nor the names of its contributors 18 * may be used to endorse or promote products derived from this software 19 * without specific prior written permission. 20 * 21 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 22 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 23 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 24 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 25 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 26 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 27 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 28 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 29 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 30 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 31 * SUCH DAMAGE. 32 */ 33 34 #include "namespace.h" 35 #include <stdio.h> 36 #include <stdlib.h> 37 #include <string.h> 38 #include <unistd.h> 39 #include "un-namespace.h" 40 41 #include "libc_private.h" 42 43 int opterr = 1, /* if error message should be printed */ 44 optind = 1, /* index into parent argv vector */ 45 optopt, /* character checked for validity */ 46 optreset; /* reset getopt */ 47 char *optarg; /* argument associated with option */ 48 49 #define BADCH (int)'?' 50 #define BADARG (int)':' 51 static char EMSG[] = ""; 52 /* 53 * getopt -- 54 * Parse argc/argv argument vector. 55 */ 56 int 57 getopt(int nargc, char * const nargv[], const char *ostr) 58 { 59 static char *place = EMSG; /* option letter processing */ 60 char *oli; /* option letter list index */ 61 62 if (optreset || *place == 0) { /* update scanning pointer */ 63 optreset = 0; 64 place = nargv[optind]; 65 if (optind >= nargc || *place++ != '-') { 66 /* Argument is absent or is not an option */ 67 place = EMSG; 68 return (-1); 69 } 70 optopt = *place++; 71 if (optopt == '-' && *place == 0) { 72 /* "--" => end of options */ 73 ++optind; 74 place = EMSG; 75 return (-1); 76 } 77 if (optopt == 0) { 78 /* Solitary '-', treat as a '-' option 79 if the program (eg su) is looking for it. */ 80 place = EMSG; 81 if (strchr(ostr, '-') == NULL) 82 return (-1); 83 optopt = '-'; 84 } 85 } else 86 optopt = *place++; 87 88 /* See if option letter is one the caller wanted... */ 89 if (optopt == ':' || (oli = strchr(ostr, optopt)) == NULL) { 90 if (*place == 0) 91 ++optind; 92 if (opterr && *ostr != ':') 93 (void)fprintf(stderr, 94 "%s: illegal option -- %c\n", _getprogname(), 95 optopt); 96 return (BADCH); 97 } 98 99 /* Does this option need an argument? */ 100 if (oli[1] != ':') { 101 /* don't need argument */ 102 optarg = NULL; 103 if (*place == 0) 104 ++optind; 105 } else { 106 /* Option-argument is either the rest of this argument or the 107 entire next argument. */ 108 if (*place) 109 optarg = place; 110 else if (oli[2] == ':') 111 /* 112 * GNU Extension, for optional arguments if the rest of 113 * the argument is empty, we return NULL 114 */ 115 optarg = NULL; 116 else if (nargc > ++optind) 117 optarg = nargv[optind]; 118 else { 119 /* option-argument absent */ 120 place = EMSG; 121 if (*ostr == ':') 122 return (BADARG); 123 if (opterr) 124 (void)fprintf(stderr, 125 "%s: option requires an argument -- %c\n", 126 _getprogname(), optopt); 127 return (BADCH); 128 } 129 place = EMSG; 130 ++optind; 131 } 132 return (optopt); /* return option letter */ 133 } 134