125 lines
3.9 KiB
C
125 lines
3.9 KiB
C
/* $Id: getopt.c,v 1.2 2005-07-07 16:34:06 dron Exp $ */
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/*
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* Copyright (c) 1987, 1993, 1994
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* The Regents of the University of California. 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
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. Neither the name of the University nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*/
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#if 0
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static char sccsid[] = "@(#)getopt.c 8.3 (Berkeley) 4/27/95";
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__RCSID("$NetBSD: getopt.c,v 1.26 2003/08/07 16:43:40 agc Exp $");
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#endif
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#include <stdio.h>
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#include <string.h>
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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(int argc, char * const argv[], const char *optstring)
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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 == 0) { /* update scanning pointer */
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optreset = 0;
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place = argv[optind];
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if (optind >= argc || *place++ != '-') {
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/* Argument is absent or is not an option */
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place = EMSG;
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return (-1);
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}
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optopt = *place++;
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if (optopt == '-' && *place == 0) {
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/* "--" => end of options */
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++optind;
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place = EMSG;
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return (-1);
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}
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if (optopt == 0) {
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/* Solitary '-', treat as a '-' option
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if the program (eg su) is looking for it. */
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place = EMSG;
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if (strchr(optstring, '-') == NULL)
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return -1;
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optopt = '-';
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}
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} else
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optopt = *place++;
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/* See if option letter is one the caller wanted... */
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if (optopt == ':' || (oli = strchr(optstring, optopt)) == NULL) {
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if (*place == 0)
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++optind;
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if (opterr && *optstring != ':')
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(void)fprintf(stderr,
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"unknown option -- %c\n", optopt);
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return (BADCH);
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}
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/* Does this option need an argument? */
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if (oli[1] != ':') {
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/* don't need argument */
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optarg = NULL;
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if (*place == 0)
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++optind;
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} else {
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/* Option-argument is either the rest of this argument or the
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entire next argument. */
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if (*place)
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optarg = place;
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else if (argc > ++optind)
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optarg = argv[optind];
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else {
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/* option-argument absent */
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place = EMSG;
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if (*optstring == ':')
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return (BADARG);
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if (opterr)
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(void)fprintf(stderr,
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"option requires an argument -- %c\n",
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optopt);
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return (BADCH);
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}
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place = EMSG;
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++optind;
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}
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return (optopt); /* return option letter */
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}
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