/* $Id: getopt.c,v 1.2.2.1 2010-06-08 18:50:43 bfriesen Exp $ */ /* * Copyright (c) 1987, 1993, 1994 * The Regents of the University of California. All rights reserved. * * Redistribution and use in source and binary forms, with or without * modification, are permitted provided that the following conditions * are met: * 1. Redistributions of source code must retain the above copyright * notice, this list of conditions and the following disclaimer. * 2. Redistributions in binary form must reproduce the above copyright * notice, this list of conditions and the following disclaimer in the * documentation and/or other materials provided with the distribution. * 3. Neither the name of the University nor the names of its contributors * may be used to endorse or promote products derived from this software * without specific prior written permission. * * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF * SUCH DAMAGE. */ #if 0 static char sccsid[] = "@(#)getopt.c 8.3 (Berkeley) 4/27/95"; __RCSID("$NetBSD: getopt.c,v 1.26 2003/08/07 16:43:40 agc Exp $"); #endif #include #include int opterr = 1, /* if error message should be printed */ optind = 1, /* index into parent argv vector */ optopt, /* character checked for validity */ optreset; /* reset getopt */ char *optarg; /* argument associated with option */ #define BADCH (int)'?' #define BADARG (int)':' #define EMSG "" /* * getopt -- * Parse argc/argv argument vector. */ int getopt(int argc, char * const argv[], const char *optstring) { static char *place = EMSG; /* option letter processing */ char *oli; /* option letter list index */ if (optreset || *place == 0) { /* update scanning pointer */ optreset = 0; place = argv[optind]; if (optind >= argc || *place++ != '-') { /* Argument is absent or is not an option */ place = EMSG; return (-1); } optopt = *place++; if (optopt == '-' && *place == 0) { /* "--" => end of options */ ++optind; place = EMSG; return (-1); } if (optopt == 0) { /* Solitary '-', treat as a '-' option if the program (eg su) is looking for it. */ place = EMSG; if (strchr(optstring, '-') == NULL) return -1; optopt = '-'; } } else optopt = *place++; /* See if option letter is one the caller wanted... */ if (optopt == ':' || (oli = strchr(optstring, optopt)) == NULL) { if (*place == 0) ++optind; if (opterr && *optstring != ':') (void)fprintf(stderr, "unknown option -- %c\n", optopt); return (BADCH); } /* Does this option need an argument? */ if (oli[1] != ':') { /* don't need argument */ optarg = NULL; if (*place == 0) ++optind; } else { /* Option-argument is either the rest of this argument or the entire next argument. */ if (*place) optarg = place; else if (argc > ++optind) optarg = argv[optind]; else { /* option-argument absent */ place = EMSG; if (*optstring == ':') return (BADARG); if (opterr) (void)fprintf(stderr, "option requires an argument -- %c\n", optopt); return (BADCH); } place = EMSG; ++optind; } return (optopt); /* return option letter */ } /* * Local Variables: * mode: c * c-basic-offset: 8 * fill-column: 78 * End: */