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 "namespace.h" 38 #include <stdio.h> 39 #include <stdlib.h> 40 #include <string.h> 41 #include <unistd.h> 42 #include "un-namespace.h" 43 44 #include "libc_private.h" 45 46 int opterr = 1, /* if error message should be printed */ 47 optind = 1, /* index into parent argv vector */ 48 optopt, /* character checked for validity */ 49 optreset; /* reset getopt */ 50 char *optarg; /* argument associated with option */ 51 52 #define BADCH (int)'?' 53 #define BADARG (int)':' 54 static char EMSG[] = ""; 55 /* 56 * getopt -- 57 * Parse argc/argv argument vector. 58 */ 59 int 60 getopt(int nargc, char * const nargv[], const char *ostr) 61 { 62 static char *place = EMSG; /* option letter processing */ 63 char *oli; /* option letter list index */ 64 65 if (optreset || *place == 0) { /* update scanning pointer */ 66 optreset = 0; 67 place = nargv[optind]; 68 if (optind >= nargc || *place++ != '-') { 69 /* Argument is absent or is not an option */ 70 place = EMSG; 71 return (-1); 72 } 73 optopt = *place++; 74 if (optopt == '-' && *place == 0) { 75 /* "--" => end of options */ 76 ++optind; 77 place = EMSG; 78 return (-1); 79 } 80 if (optopt == 0) { 81 /* Solitary '-', treat as a '-' option 82 if the program (eg su) is looking for it. */ 83 place = EMSG; 84 if (strchr(ostr, '-') == NULL) 85 return (-1); 86 optopt = '-'; 87 } 88 } else 89 optopt = *place++; 90 91 /* See if option letter is one the caller wanted... */ 92 if (optopt == ':' || (oli = strchr(ostr, optopt)) == NULL) { 93 if (*place == 0) 94 ++optind; 95 if (opterr && *ostr != ':') 96 (void)fprintf(stderr, 97 "%s: illegal option -- %c\n", _getprogname(), 98 optopt); 99 return (BADCH); 100 } 101 102 /* Does this option need an argument? */ 103 if (oli[1] != ':') { 104 /* don't need argument */ 105 optarg = NULL; 106 if (*place == 0) 107 ++optind; 108 } else { 109 /* Option-argument is either the rest of this argument or the 110 entire next argument. */ 111 if (*place) 112 optarg = place; 113 else if (oli[2] == ':') 114 /* 115 * GNU Extension, for optional arguments if the rest of 116 * the argument is empty, we return NULL 117 */ 118 optarg = NULL; 119 else if (nargc > ++optind) 120 optarg = nargv[optind]; 121 else { 122 /* option-argument absent */ 123 place = EMSG; 124 if (*ostr == ':') 125 return (BADARG); 126 if (opterr) 127 (void)fprintf(stderr, 128 "%s: option requires an argument -- %c\n", 129 _getprogname(), optopt); 130 return (BADCH); 131 } 132 place = EMSG; 133 ++optind; 134 } 135 return (optopt); /* return option letter */ 136 } 137