1 /* $NetBSD: getopt.c,v 1.26 2003/08/07 16:43:40 agc 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. All advertising materials mentioning features or use of this software 16 * must display the following acknowledgement: 17 * This product includes software developed by the University of 18 * California, Berkeley and its contributors. 19 * 4. Neither the name of the University nor the names of its contributors 20 * may be used to endorse or promote products derived from this software 21 * without specific prior written permission. 22 * 23 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 24 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 25 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 26 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 27 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 28 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 29 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 30 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 31 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 32 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 33 * SUCH DAMAGE. 34 */ 35 36 #if defined(LIBC_SCCS) && !defined(lint) 37 static char sccsid[] = "@(#)getopt.c 8.3 (Berkeley) 4/27/95"; 38 #endif /* LIBC_SCCS and not lint */ 39 #include <sys/cdefs.h> 40 __FBSDID("$FreeBSD$"); 41 42 #include "namespace.h" 43 #include <stdio.h> 44 #include <stdlib.h> 45 #include <string.h> 46 #include <unistd.h> 47 #include "un-namespace.h" 48 49 #include "libc_private.h" 50 51 int opterr = 1, /* if error message should be printed */ 52 optind = 1, /* index into parent argv vector */ 53 optopt, /* character checked for validity */ 54 optreset; /* reset getopt */ 55 char *optarg; /* argument associated with option */ 56 57 #define BADCH (int)'?' 58 #define BADARG (int)':' 59 #define EMSG "" 60 61 /* 62 * getopt -- 63 * Parse argc/argv argument vector. 64 */ 65 int 66 getopt(nargc, nargv, ostr) 67 int nargc; 68 char * const nargv[]; 69 const char *ostr; 70 { 71 static char *place = EMSG; /* option letter processing */ 72 char *oli; /* option letter list index */ 73 74 if (optreset || *place == 0) { /* update scanning pointer */ 75 optreset = 0; 76 place = nargv[optind]; 77 if (optind >= nargc || *place++ != '-') { 78 /* Argument is absent or is not an option */ 79 place = EMSG; 80 return (-1); 81 } 82 optopt = *place++; 83 if (optopt == '-' && *place == 0) { 84 /* "--" => end of options */ 85 ++optind; 86 place = EMSG; 87 return (-1); 88 } 89 if (optopt == 0) { 90 /* Solitary '-', treat as a '-' option 91 if the program (eg su) is looking for it. */ 92 place = EMSG; 93 if (strchr(ostr, '-') == NULL) 94 return (-1); 95 optopt = '-'; 96 } 97 } else 98 optopt = *place++; 99 100 /* See if option letter is one the caller wanted... */ 101 if (optopt == ':' || (oli = strchr(ostr, optopt)) == NULL) { 102 if (*place == 0) 103 ++optind; 104 if (opterr && *ostr != ':') 105 (void)fprintf(stderr, 106 "%s: illegal option -- %c\n", _getprogname(), 107 optopt); 108 return (BADCH); 109 } 110 111 /* Does this option need an argument? */ 112 if (oli[1] != ':') { 113 /* don't need argument */ 114 optarg = NULL; 115 if (*place == 0) 116 ++optind; 117 } else { 118 /* Option-argument is either the rest of this argument or the 119 entire next argument. */ 120 if (*place) 121 optarg = place; 122 else if (nargc > ++optind) 123 optarg = nargv[optind]; 124 else { 125 /* option-argument absent */ 126 place = EMSG; 127 if (*ostr == ':') 128 return (BADARG); 129 if (opterr) 130 (void)fprintf(stderr, 131 "%s: option requires an argument -- %c\n", 132 _getprogname(), optopt); 133 return (BADCH); 134 } 135 place = EMSG; 136 ++optind; 137 } 138 return (optopt); /* return option letter */ 139 } 140