1 /* 2 * Copyright (c) 1987, 1993, 1994 3 * The Regents of the University of California. All rights reserved. 4 * 5 * Redistribution and use in source and binary forms, with or without 6 * modification, are permitted provided that the following conditions 7 * are met: 8 * 1. Redistributions of source code must retain the above copyright 9 * notice, this list of conditions and the following disclaimer. 10 * 2. Redistributions in binary form must reproduce the above copyright 11 * notice, this list of conditions and the following disclaimer in the 12 * documentation and/or other materials provided with the distribution. 13 * 3. Neither the name of the University nor the names of its contributors 14 * may be used to endorse or promote products derived from this software 15 * without specific prior written permission. 16 * 17 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 18 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 19 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 20 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 21 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 22 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 23 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 24 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 25 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 26 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 27 * SUCH DAMAGE. 28 * 29 * @(#)getopt.c 8.3 (Berkeley) 4/27/95 30 * $DragonFly: src/lib/libstand/getopt.c,v 1.3 2005/12/11 02:27:26 swildner Exp $ 31 */ 32 33 #include "stand.h" 34 #include <string.h> 35 36 int opterr = 1, /* if error message should be printed */ 37 optind = 1, /* index into parent argv vector */ 38 optopt, /* character checked for validity */ 39 optreset; /* reset getopt */ 40 char *optarg; /* argument associated with option */ 41 42 #define BADCH (int)'?' 43 #define BADARG (int)':' 44 #define EMSG "" 45 46 /* 47 * getopt -- 48 * Parse argc/argv argument vector. 49 */ 50 int 51 getopt(int nargc, char * const *nargv, const char *ostr) 52 { 53 static char *place = EMSG; /* option letter processing */ 54 char *oli; /* option letter list index */ 55 56 if (optreset || !*place) { /* update scanning pointer */ 57 optreset = 0; 58 if (optind >= nargc || *(place = nargv[optind]) != '-') { 59 place = EMSG; 60 return (-1); 61 } 62 if (place[1] && *++place == '-') { /* found "--" */ 63 ++optind; 64 place = EMSG; 65 return (-1); 66 } 67 } /* option letter okay? */ 68 if ((optopt = (int)*place++) == (int)':' || 69 !(oli = strchr(ostr, optopt))) { 70 /* 71 * if the user didn't specify '-' as an option, 72 * assume it means -1. 73 */ 74 if (optopt == (int)'-') 75 return (-1); 76 if (!*place) 77 ++optind; 78 if (opterr && *ostr != ':') 79 (void)printf("illegal option -- %c\n", optopt); 80 return (BADCH); 81 } 82 if (*++oli != ':') { /* don't need argument */ 83 optarg = NULL; 84 if (!*place) 85 ++optind; 86 } 87 else { /* need an argument */ 88 if (*place) /* no white space */ 89 optarg = place; 90 else if (nargc <= ++optind) { /* no arg */ 91 place = EMSG; 92 if (*ostr == ':') 93 return (BADARG); 94 if (opterr) 95 (void)printf("option requires an argument -- %c\n", optopt); 96 return (BADCH); 97 } 98 else /* white space */ 99 optarg = nargv[optind]; 100 place = EMSG; 101 ++optind; 102 } 103 return (optopt); /* dump back option letter */ 104 } 105