1 /* $NetBSD: getopt.c,v 1.24 2002/06/21 09:56:33 wiz 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 #include <sys/cdefs.h> 37 #if defined(LIBC_SCCS) && !defined(lint) 38 #if 0 39 static char sccsid[] = "@(#)getopt.c 8.3 (Berkeley) 4/27/95"; 40 #else 41 __RCSID("$NetBSD: getopt.c,v 1.24 2002/06/21 09:56:33 wiz Exp $"); 42 #endif 43 #endif /* LIBC_SCCS and not lint */ 44 45 #include "namespace.h" 46 47 #include <assert.h> 48 #include <errno.h> 49 #include <stdio.h> 50 #include <stdlib.h> 51 #include <string.h> 52 #include <unistd.h> 53 54 #ifdef __weak_alias 55 __weak_alias(getopt,_getopt) 56 #endif 57 58 int opterr = 1, /* if error message should be printed */ 59 optind = 1, /* index into parent argv vector */ 60 optopt, /* character checked for validity */ 61 optreset; /* reset getopt */ 62 char *optarg; /* argument associated with option */ 63 64 #define BADCH (int)'?' 65 #define BADARG (int)':' 66 #define EMSG "" 67 68 /* 69 * getopt -- 70 * Parse argc/argv argument vector. 71 */ 72 int 73 getopt(nargc, nargv, ostr) 74 int nargc; 75 char * const nargv[]; 76 const char *ostr; 77 { 78 static char *place = EMSG; /* option letter processing */ 79 char *oli; /* option letter list index */ 80 81 _DIAGASSERT(nargv != NULL); 82 _DIAGASSERT(ostr != NULL); 83 84 if (optreset || !*place) { /* update scanning pointer */ 85 optreset = 0; 86 if (optind >= nargc || *(place = nargv[optind]) != '-') { 87 place = EMSG; 88 return (-1); 89 } 90 if (place[1] && *++place == '-' /* found "--" */ 91 && place[1] == '\0') { 92 ++optind; 93 place = EMSG; 94 return (-1); 95 } 96 } /* option letter okay? */ 97 if ((optopt = (int)*place++) == (int)':' || 98 !(oli = strchr(ostr, optopt))) { 99 /* 100 * if the user didn't specify '-' as an option, 101 * assume it means -1. 102 */ 103 if (optopt == (int)'-') 104 return (-1); 105 if (!*place) 106 ++optind; 107 if (opterr && *ostr != ':') 108 (void)fprintf(stderr, 109 "%s: unknown option -- %c\n", getprogname(), 110 optopt); 111 return (BADCH); 112 } 113 if (*++oli != ':') { /* don't need argument */ 114 optarg = NULL; 115 if (!*place) 116 ++optind; 117 } 118 else { /* need an argument */ 119 if (*place) /* no white space */ 120 optarg = place; 121 else if (nargc <= ++optind) { /* no arg */ 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 else /* white space */ 132 optarg = nargv[optind]; 133 place = EMSG; 134 ++optind; 135 } 136 return (optopt); /* dump back option letter */ 137 } 138