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 __FBSDID("$FreeBSD$"); 37 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 #define EMSG "" 56 57 /* 58 * getopt -- 59 * Parse argc/argv argument vector. 60 */ 61 int 62 getopt(int nargc, char * const nargv[], const char *ostr) 63 { 64 static char *place = EMSG; /* option letter processing */ 65 char *oli; /* option letter list index */ 66 67 if (optreset || *place == 0) { /* update scanning pointer */ 68 optreset = 0; 69 place = nargv[optind]; 70 if (optind >= nargc || *place++ != '-') { 71 /* Argument is absent or is not an option */ 72 place = EMSG; 73 return (-1); 74 } 75 optopt = *place++; 76 if (optopt == '-' && *place == 0) { 77 /* "--" => end of options */ 78 ++optind; 79 place = EMSG; 80 return (-1); 81 } 82 if (optopt == 0) { 83 /* Solitary '-', treat as a '-' option 84 if the program (eg su) is looking for it. */ 85 place = EMSG; 86 if (strchr(ostr, '-') == NULL) 87 return (-1); 88 optopt = '-'; 89 } 90 } else 91 optopt = *place++; 92 93 /* See if option letter is one the caller wanted... */ 94 if (optopt == ':' || (oli = strchr(ostr, optopt)) == NULL) { 95 if (*place == 0) 96 ++optind; 97 if (opterr && *ostr != ':') 98 (void)fprintf(stderr, 99 "%s: illegal option -- %c\n", _getprogname(), 100 optopt); 101 return (BADCH); 102 } 103 104 /* Does this option need an argument? */ 105 if (oli[1] != ':') { 106 /* don't need argument */ 107 optarg = NULL; 108 if (*place == 0) 109 ++optind; 110 } else { 111 /* Option-argument is either the rest of this argument or the 112 entire next argument. */ 113 if (*place) 114 optarg = place; 115 else if (oli[2] == ':') 116 /* 117 * GNU Extension, for optional arguments if the rest of 118 * the argument is empty, we return NULL 119 */ 120 optarg = NULL; 121 else if (nargc > ++optind) 122 optarg = nargv[optind]; 123 else { 124 /* option-argument absent */ 125 place = EMSG; 126 if (*ostr == ':') 127 return (BADARG); 128 if (opterr) 129 (void)fprintf(stderr, 130 "%s: option requires an argument -- %c\n", 131 _getprogname(), optopt); 132 return (BADCH); 133 } 134 place = EMSG; 135 ++optind; 136 } 137 return (optopt); /* return option letter */ 138 } 139