1 /* $NetBSD: getopt.c,v 1.1.1.1 1997/03/14 02:40:31 perry 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 /* from: netbsd:lib/libc/stdlib/getopt.c */ 37 38 #include <lib/libkern/libkern.h> 39 #include "stand.h" 40 41 int opterr = 1, /* if error message should be printed */ 42 optind = 1, /* index into parent argv vector */ 43 optopt, /* character checked for validity */ 44 optreset; /* reset getopt */ 45 char *optarg; /* argument associated with option */ 46 47 #define BADCH (int)'?' 48 #define BADARG (int)':' 49 #define EMSG "" 50 51 /* 52 * getopt -- 53 * Parse argc/argv argument vector. 54 */ 55 int 56 getopt(nargc, nargv, ostr) 57 int nargc; 58 char * const *nargv; 59 const char *ostr; 60 { 61 static char *place = EMSG; /* option letter processing */ 62 char *oli; /* option letter list index */ 63 64 if (optreset || !*place) { /* update scanning pointer */ 65 optreset = 0; 66 if (optind >= nargc || *(place = nargv[optind]) != '-') { 67 place = EMSG; 68 return (-1); 69 } 70 if (place[1] && *++place == '-') { /* found "--" */ 71 ++optind; 72 place = EMSG; 73 return (-1); 74 } 75 } /* option letter okay? */ 76 if ((optopt = (int)*place++) == (int)':' || 77 !(oli = strchr(ostr, optopt))) { 78 /* 79 * if the user didn't specify '-' as an option, 80 * assume it means -1. 81 */ 82 if (optopt == (int)'-') 83 return (-1); 84 if (!*place) 85 ++optind; 86 if (opterr && *ostr != ':') 87 printf("illegal option -- %c\n", optopt); 88 return (BADCH); 89 } 90 if (*++oli != ':') { /* don't need argument */ 91 optarg = NULL; 92 if (!*place) 93 ++optind; 94 } 95 else { /* need an argument */ 96 if (*place) /* no white space */ 97 optarg = place; 98 else if (nargc <= ++optind) { /* no arg */ 99 place = EMSG; 100 if (*ostr == ':') 101 return (BADARG); 102 if (opterr) 103 printf("option requires an argument -- %c\n", 104 optopt); 105 return (BADCH); 106 } 107 else /* white space */ 108 optarg = nargv[optind]; 109 place = EMSG; 110 ++optind; 111 } 112 return (optopt); /* dump back option letter */ 113 } 114