/* * Original file name getopt.c Initial import into the c-ares source tree * on 2007-04-11. Lifted from version 5.2 of the 'Open Mash' project with * the modified BSD license, BSD license without the advertising clause. * * $Id$ */ /* * getopt.c -- * * Standard UNIX getopt function. Code is from BSD. * * Copyright (c) 1987-2001 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: * * A. Redistributions of source code must retain the above copyright notice, * this list of conditions and the following disclaimer. * B. 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. * C. Neither the names of the copyright holders 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 COPYRIGHT HOLDERS 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 !defined(lint) * static char sccsid[] = "@(#)getopt.c 8.2 (Berkeley) 4/2/94"; * #endif */ #include <stdio.h> #include <stdlib.h> #include <string.h> #include "ares_getopt.h" 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 (char *)"" /* * ares_getopt -- * Parse argc/argv argument vector. */ int ares_getopt(int nargc, char * const nargv[], const char *ostr) { static char *place = EMSG; /* option letter processing */ char *oli; /* option letter list index */ if (optreset || !*place) { /* update scanning pointer */ optreset = 0; if (optind >= nargc || *(place = nargv[optind]) != '-') { place = EMSG; return (EOF); } if (place[1] && *++place == '-') { /* found "--" */ ++optind; place = EMSG; return (EOF); } } /* option letter okay? */ if ((optopt = (int)*place++) == (int)':' || (oli = strchr(ostr, optopt)) == NULL) { /* * if the user didn't specify '-' as an option, * assume it means EOF. */ if (optopt == (int)'-') return (EOF); if (!*place) ++optind; if (opterr && *ostr != ':') (void)fprintf(stderr, "%s: illegal option -- %c\n", __FILE__, optopt); return (BADCH); } if (*++oli != ':') { /* don't need argument */ optarg = NULL; if (!*place) ++optind; } else { /* need an argument */ if (*place) /* no white space */ optarg = place; else if (nargc <= ++optind) { /* no arg */ place = EMSG; if (*ostr == ':') return (BADARG); if (opterr) (void)fprintf(stderr, "%s: option requires an argument -- %c\n", __FILE__, optopt); return (BADCH); } else /* white space */ optarg = nargv[optind]; place = EMSG; ++optind; } return (optopt); /* dump back option letter */ }