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 30 #include "stand.h" 31 #include <string.h> 32 33 int opterr = 1, /* if error message should be printed */ 34 optind = 1, /* index into parent argv vector */ 35 optopt, /* character checked for validity */ 36 optreset; /* reset getopt */ 37 char *optarg; /* argument associated with option */ 38 39 #define BADCH (int)'?' 40 #define BADARG (int)':' 41 #define EMSG "" 42 43 /* 44 * getopt -- 45 * Parse argc/argv argument vector. 46 */ 47 int 48 getopt(int nargc, char * const *nargv, const char *ostr) 49 { 50 static char *place = EMSG; /* option letter processing */ 51 char *oli; /* option letter list index */ 52 53 if (optreset || !*place) { /* update scanning pointer */ 54 optreset = 0; 55 if (optind >= nargc || *(place = nargv[optind]) != '-') { 56 place = EMSG; 57 return (-1); 58 } 59 if (place[1] && *++place == '-') { /* found "--" */ 60 ++optind; 61 place = EMSG; 62 return (-1); 63 } 64 } /* option letter okay? */ 65 if ((optopt = (int)*place++) == (int)':' || 66 !(oli = strchr(ostr, optopt))) { 67 /* 68 * if the user didn't specify '-' as an option, 69 * assume it means -1. 70 */ 71 if (optopt == (int)'-') 72 return (-1); 73 if (!*place) 74 ++optind; 75 if (opterr && *ostr != ':') 76 (void)printf("illegal option -- %c\n", optopt); 77 return (BADCH); 78 } 79 if (*++oli != ':') { /* don't need argument */ 80 optarg = NULL; 81 if (!*place) 82 ++optind; 83 } 84 else { /* need an argument */ 85 if (*place) /* no white space */ 86 optarg = place; 87 else if (nargc <= ++optind) { /* no arg */ 88 place = EMSG; 89 if (*ostr == ':') 90 return (BADARG); 91 if (opterr) 92 (void)printf("option requires an argument -- %c\n", optopt); 93 return (BADCH); 94 } 95 else /* white space */ 96 optarg = nargv[optind]; 97 place = EMSG; 98 ++optind; 99 } 100 return (optopt); /* dump back option letter */ 101 } 102