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 #if defined(LIBC_SCCS) && !defined(lint) 32 static char sccsid[] = "@(#)getopt.c 8.3 (Berkeley) 4/27/95"; 33 #endif /* LIBC_SCCS and not lint */ 34 35 #include "stand.h" 36 #include <string.h> 37 38 int opterr = 1, /* if error message should be printed */ 39 optind = 1, /* index into parent argv vector */ 40 optopt, /* character checked for validity */ 41 optreset; /* reset getopt */ 42 char *optarg; /* argument associated with option */ 43 44 #define BADCH (int)'?' 45 #define BADARG (int)':' 46 #define EMSG "" 47 48 /* 49 * getopt -- 50 * Parse argc/argv argument vector. 51 */ 52 int 53 getopt(int nargc, char * const *nargv, const char *ostr) 54 { 55 static char *place = EMSG; /* option letter processing */ 56 char *oli; /* option letter list index */ 57 58 if (optreset || !*place) { /* update scanning pointer */ 59 optreset = 0; 60 if (optind >= nargc || *(place = nargv[optind]) != '-') { 61 place = EMSG; 62 return (-1); 63 } 64 if (place[1] && *++place == '-') { /* found "--" */ 65 ++optind; 66 place = EMSG; 67 return (-1); 68 } 69 } /* option letter okay? */ 70 if ((optopt = (int)*place++) == (int)':' || 71 !(oli = strchr(ostr, optopt))) { 72 /* 73 * if the user didn't specify '-' as an option, 74 * assume it means -1. 75 */ 76 if (optopt == (int)'-') 77 return (-1); 78 if (!*place) 79 ++optind; 80 if (opterr && *ostr != ':') 81 (void)printf("illegal option -- %c\n", optopt); 82 return (BADCH); 83 } 84 if (*++oli != ':') { /* don't need argument */ 85 optarg = NULL; 86 if (!*place) 87 ++optind; 88 } 89 else { /* need an argument */ 90 if (*place) /* no white space */ 91 optarg = place; 92 else if (nargc <= ++optind) { /* no arg */ 93 place = EMSG; 94 if (*ostr == ':') 95 return (BADARG); 96 if (opterr) 97 (void)printf("option requires an argument -- %c\n", 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