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 #if defined(LIBC_SCCS) && !defined(lint) 35 static char sccsid[] = "@(#)getopt.c 8.3 (Berkeley) 4/27/95"; 36 #endif /* LIBC_SCCS and not lint */ 37 #include <sys/cdefs.h> 38 #include "namespace.h" 39 #include <stdio.h> 40 #include <stdlib.h> 41 #include <string.h> 42 #include <unistd.h> 43 #include "un-namespace.h" 44 45 #include "libc_private.h" 46 47 int opterr = 1, /* if error message should be printed */ 48 optind = 1, /* index into parent argv vector */ 49 optopt, /* character checked for validity */ 50 optreset; /* reset getopt */ 51 char *optarg; /* argument associated with option */ 52 53 #define BADCH (int)'?' 54 #define BADARG (int)':' 55 static char EMSG[] = ""; 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 if (optreset || *place == 0) { /* update scanning pointer */ 67 optreset = 0; 68 place = nargv[optind]; 69 if (optind >= nargc || *place++ != '-') { 70 /* Argument is absent or is not an option */ 71 place = EMSG; 72 return (-1); 73 } 74 optopt = *place++; 75 if (optopt == '-' && *place == 0) { 76 /* "--" => end of options */ 77 ++optind; 78 place = EMSG; 79 return (-1); 80 } 81 if (optopt == 0) { 82 /* Solitary '-', treat as a '-' option 83 if the program (eg su) is looking for it. */ 84 place = EMSG; 85 if (strchr(ostr, '-') == NULL) 86 return (-1); 87 optopt = '-'; 88 } 89 } else 90 optopt = *place++; 91 92 /* See if option letter is one the caller wanted... */ 93 if (optopt == ':' || (oli = strchr(ostr, optopt)) == NULL) { 94 if (*place == 0) 95 ++optind; 96 if (opterr && *ostr != ':') 97 (void)fprintf(stderr, 98 "%s: illegal option -- %c\n", _getprogname(), 99 optopt); 100 return (BADCH); 101 } 102 103 /* Does this option need an argument? */ 104 if (oli[1] != ':') { 105 /* don't need argument */ 106 optarg = NULL; 107 if (*place == 0) 108 ++optind; 109 } else { 110 /* Option-argument is either the rest of this argument or the 111 entire next argument. */ 112 if (*place) 113 optarg = place; 114 else if (oli[2] == ':') 115 /* 116 * GNU Extension, for optional arguments if the rest of 117 * the argument is empty, we return NULL 118 */ 119 optarg = NULL; 120 else if (nargc > ++optind) 121 optarg = nargv[optind]; 122 else { 123 /* option-argument absent */ 124 place = EMSG; 125 if (*ostr == ':') 126 return (BADARG); 127 if (opterr) 128 (void)fprintf(stderr, 129 "%s: option requires an argument -- %c\n", 130 _getprogname(), optopt); 131 return (BADCH); 132 } 133 place = EMSG; 134 ++optind; 135 } 136 return (optopt); /* return option letter */ 137 } 138