1 /* $NetBSD: getopt.c,v 1.5 2009/03/14 15:36:08 dsl 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. 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 /* from: netbsd:lib/libc/stdlib/getopt.c */ 33 34 #include <lib/libkern/libkern.h> 35 #include <lib/libsa/stand.h> 36 37 int opterr = 1, /* if error message should be printed */ 38 optind = 1, /* index into parent argv vector */ 39 optopt, /* character checked for validity */ 40 optreset; /* reset getopt */ 41 char *optarg; /* argument associated with option */ 42 43 #define BADCH (int)'?' 44 #define BADARG (int)':' 45 #define EMSG "" 46 47 /* 48 * getopt -- 49 * Parse argc/argv argument vector. 50 */ 51 int 52 getopt(int nargc, char * const *nargv, const char *ostr) 53 { 54 static char *place = EMSG; /* option letter processing */ 55 char *oli; /* option letter list index */ 56 57 if (optreset || !*place) { /* update scanning pointer */ 58 optreset = 0; 59 if (optind >= nargc || *(place = nargv[optind]) != '-') { 60 place = EMSG; 61 return (-1); 62 } 63 if (place[1] && *++place == '-') { /* found "--" */ 64 ++optind; 65 place = EMSG; 66 return (-1); 67 } 68 } /* option letter okay? */ 69 if ((optopt = (int)*place++) == (int)':' || 70 !(oli = strchr(ostr, optopt))) { 71 /* 72 * if the user didn't specify '-' as an option, 73 * assume it means -1. 74 */ 75 if (optopt == (int)'-') 76 return (-1); 77 if (!*place) 78 ++optind; 79 if (opterr && *ostr != ':') 80 printf("illegal option -- %c\n", optopt); 81 return (BADCH); 82 } 83 if (*++oli != ':') { /* don't need argument */ 84 optarg = NULL; 85 if (!*place) 86 ++optind; 87 } 88 else { /* need an argument */ 89 if (*place) /* no white space */ 90 optarg = place; 91 else if (nargc <= ++optind) { /* no arg */ 92 place = EMSG; 93 if (*ostr == ':') 94 return (BADARG); 95 if (opterr) 96 printf("option requires an argument -- %c\n", 97 optopt); 98 return (BADCH); 99 } 100 else /* white space */ 101 optarg = nargv[optind]; 102 place = EMSG; 103 ++optind; 104 } 105 return (optopt); /* dump back option letter */ 106 } 107