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110 lines
3.3 KiB
C
110 lines
3.3 KiB
C
/*
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* VARCem Virtual ARchaeological Computer EMulator.
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* An emulator of (mostly) x86-based PC systems and devices,
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* using the ISA,EISA,VLB,MCA and PCI system buses, roughly
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* spanning the era between 1981 and 1995.
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*
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* This file is part of the VARCem Project.
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*
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* Portable GETOPT(3) function.
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*
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* This is a simple version of the UNIX-standard GetOpt(3)
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* library routine. We don't support any of the GNU LibC
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* enhancements such as long-name options, double-dash
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* options and such. We keep it simple and small here.
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*
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* Version: @(#)getopt.c 1.0.1 2002/08/13
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*
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* Author: Fred N. van Kempen, <waltje@varcem.com>
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*
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* Copyright 1998-2018 MicroWalt Corporation
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* Copyright 2018-2021 The VARCem Team
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*
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* Redistribution and use in source and binary forms, with
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* or without modification, are permitted provided that the
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* following conditions are met:
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*
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* 1. Redistributions of source code must retain the entire
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* above notice, this list of conditions and the following
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* disclaimer.
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*
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* 2. Redistributions in binary form must reproduce the above
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* copyright notice, this list of conditions and the
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* following disclaimer in the documentation and/or other
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* materials provided with the distribution.
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*
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* 3. Neither the name of the copyright holder nor the names
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* of its contributors may be used to endorse or promote
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* products derived from this software without specific
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* prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A
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* PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
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* HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
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* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
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* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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#include <stdio.h>
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#include <string.h>
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char *optarg;
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int optind = 0;
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int opterr = 1;
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int optopt;
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static char *scan = (char *)NULL;
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int
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getopt(int argc, char **argv, const char *optstring)
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{
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char c;
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char *place;
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optarg = (char *)NULL;
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if (scan == (char *)NULL || *scan == '\0') {
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if (optind == 0) optind++;
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if (optind >= argc || argv[optind][0] != '-' || argv[optind][1] == '\0')
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return(EOF);
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if (strcmp(argv[optind], "--") == 0) {
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optind++;
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return(EOF);
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}
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scan = argv[optind] + 1;
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optind++;
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}
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optopt = c = *scan++;
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place = strchr(optstring, c);
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if (place == (char *)NULL || c == ':') {
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if (opterr) fprintf(stderr, "%s: unknown option -%c\n", argv[0], c);
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return('?');
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}
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place++;
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if (*place == ':') {
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if (*scan != '\0') {
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optarg = scan;
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scan = (char *)NULL;
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} else if (optind < argc) {
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optarg = argv[optind];
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optind++;
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} else {
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if (opterr)
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fprintf(stderr,
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"%s: -%c argument missing\n", argv[0], c);
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return('?');
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}
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}
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return(c);
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}
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