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