Add file ares_getopt.c
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.
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ares/ares_getopt.c
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ares/ares_getopt.c
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/*
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* Original file name getopt.c Initial import into the c-ares source tree
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* on 2007-04-11. Lifted from version 5.2 of the 'Open Mash' project with
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* the modified BSD license, BSD license without the advertising clause.
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*
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* $Id$
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*/
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/*
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* getopt.c --
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*
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* Standard UNIX getopt function. Code is from BSD.
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*
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* Copyright (c) 1987-2001 The Regents of the University of California.
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions are met:
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*
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* A. Redistributions of source code must retain the above copyright notice,
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* this list of conditions and the following disclaimer.
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* B. Redistributions in binary form must reproduce the above copyright notice,
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* this list of conditions and the following disclaimer in the documentation
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* and/or other materials provided with the distribution.
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* C. Neither the names of the copyright holders nor the names of its
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* contributors may be used to endorse or promote products derived from this
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* software without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS ``AS
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* IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
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* THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
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* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE
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* LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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* POSSIBILITY OF SUCH DAMAGE.
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*/
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/* #if !defined(lint)
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* static char sccsid[] = "@(#)getopt.c 8.2 (Berkeley) 4/2/94";
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* #endif
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*/
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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/* declarations to provide consistent linkage */
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extern char *optarg;
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extern int optind;
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extern int opterr;
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int opterr = 1, /* if error message should be printed */
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optind = 1, /* index into parent argv vector */
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optopt, /* character checked for validity */
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optreset; /* reset getopt */
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char *optarg; /* argument associated with option */
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#define BADCH (int)'?'
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#define BADARG (int)':'
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#define EMSG ""
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/*
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* getopt --
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* Parse argc/argv argument vector.
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*/
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int
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getopt(nargc, nargv, ostr)
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int nargc;
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char * const *nargv;
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const char *ostr;
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{
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static char *place = EMSG; /* option letter processing */
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char *oli; /* option letter list index */
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if (optreset || !*place) { /* update scanning pointer */
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optreset = 0;
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if (optind >= nargc || *(place = nargv[optind]) != '-') {
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place = EMSG;
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return (EOF);
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}
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if (place[1] && *++place == '-') { /* found "--" */
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++optind;
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place = EMSG;
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return (EOF);
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}
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} /* option letter okay? */
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if ((optopt = (int)*place++) == (int)':' ||
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!(oli = strchr(ostr, optopt))) {
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/*
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* if the user didn't specify '-' as an option,
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* assume it means EOF.
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*/
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if (optopt == (int)'-')
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return (EOF);
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if (!*place)
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++optind;
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if (opterr && *ostr != ':')
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(void)fprintf(stderr,
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"%s: illegal option -- %c\n", __FILE__, optopt);
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return (BADCH);
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}
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if (*++oli != ':') { /* don't need argument */
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optarg = NULL;
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if (!*place)
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++optind;
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}
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else { /* need an argument */
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if (*place) /* no white space */
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optarg = place;
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else if (nargc <= ++optind) { /* no arg */
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place = EMSG;
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if (*ostr == ':')
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return (BADARG);
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if (opterr)
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(void)fprintf(stderr,
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"%s: option requires an argument -- %c\n",
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__FILE__, optopt);
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return (BADCH);
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}
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else /* white space */
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optarg = nargv[optind];
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place = EMSG;
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++optind;
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}
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return (optopt); /* dump back option letter */
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}
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