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