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 * @(#)getopt.c 8.3 (Berkeley) 4/27/95 36 * $FreeBSD: src/lib/libc/stdlib/getopt.c,v 1.2.2.2 2001/08/26 03:36:04 jkoshy Exp $ 37 * $DragonFly: src/lib/libc/stdlib/getopt.c,v 1.3 2004/07/15 04:10:33 hmp Exp $ 38 */ 39 40 #include <stdio.h> 41 #include <stdlib.h> 42 #include <string.h> 43 44 int opterr = 1, /* if error message should be printed */ 45 optind = 1, /* index into parent argv vector */ 46 optopt, /* character checked for validity */ 47 optreset; /* reset getopt */ 48 char *optarg; /* argument associated with option */ 49 50 #define BADCH (int)'?' 51 #define BADARG (int)':' 52 #define EMSG "" 53 54 /* 55 * getopt -- 56 * Parse argc/argv argument vector. 57 */ 58 int 59 getopt(nargc, nargv, ostr) 60 int nargc; 61 char * const nargv[]; 62 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 (nargc > ++optind) 116 optarg = nargv[optind]; 117 else { 118 /* option-argument absent */ 119 place = EMSG; 120 if (*ostr == ':') 121 return (BADARG); 122 if (opterr) 123 (void)fprintf(stderr, 124 "%s: option requires an argument -- %c\n", 125 getprogname(), optopt); 126 return (BADCH); 127 } 128 place = EMSG; 129 ++optind; 130 } 131 return (optopt); /* return option letter */ 132 } 133