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 <sys/cdefs.h> 31 32 #include "stand.h" 33 #include <string.h> 34 35 int opterr = 1, /* if error message should be printed */ 36 optind = 1, /* index into parent argv vector */ 37 optopt, /* character checked for validity */ 38 optreset; /* reset getopt */ 39 char *optarg; /* argument associated with option */ 40 41 #define BADCH (int)'?' 42 #define BADARG (int)':' 43 #define EMSG "" 44 45 /* 46 * getopt -- 47 * Parse argc/argv argument vector. 48 */ 49 int 50 getopt(int nargc, char * const *nargv, const char *ostr) 51 { 52 static char *place = EMSG; /* option letter processing */ 53 char *oli; /* option letter list index */ 54 55 if (optreset || !*place) { /* update scanning pointer */ 56 optreset = 0; 57 if (optind >= nargc || *(place = nargv[optind]) != '-') { 58 place = EMSG; 59 return (-1); 60 } 61 if (place[1] && *++place == '-') { /* found "--" */ 62 ++optind; 63 place = EMSG; 64 return (-1); 65 } 66 } /* option letter okay? */ 67 if ((optopt = (int)*place++) == (int)':' || 68 !(oli = strchr(ostr, optopt))) { 69 /* 70 * if the user didn't specify '-' as an option, 71 * assume it means -1. 72 */ 73 if (optopt == (int)'-') 74 return (-1); 75 if (!*place) 76 ++optind; 77 if (opterr && *ostr != ':') 78 (void)printf("illegal option -- %c\n", optopt); 79 return (BADCH); 80 } 81 if (*++oli != ':') { /* don't need argument */ 82 optarg = NULL; 83 if (!*place) 84 ++optind; 85 } 86 else { /* need an argument */ 87 if (*place) /* no white space */ 88 optarg = place; 89 else if (nargc <= ++optind) { /* no arg */ 90 place = EMSG; 91 if (*ostr == ':') 92 return (BADARG); 93 if (opterr) 94 (void)printf("option requires an argument -- %c\n", optopt); 95 return (BADCH); 96 } 97 else /* white space */ 98 optarg = nargv[optind]; 99 place = EMSG; 100 ++optind; 101 } 102 return (optopt); /* dump back option letter */ 103 } 104