proxmark3/client/reveng/getopt.c

/*----------------------------------------------------------------------

    Replacement for Unix "getopt()", for DOS/Windows/etc.

    getopt.c 1.3 2003/09/17 16:17:59

    Copyright (C) 1998, 2003 by David A. Hinds -- All Rights Reserved

    This file is part of ASPEX.

    ASPEX is free software; you can redistribute it and/or modify it
    under the terms of the GNU General Public License as published by
    the Free Software Foundation; either version 2 of the License, or
    (at your option) any later version.

    ASPEX is distributed in the hope that it will be useful, but
    WITHOUT ANY WARRANTY; without even the implied warranty of
    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
    General Public License for more details.

    You should have received a copy of the GNU General Public License
    along with ASPEX; if not, write to the Free Software Foundation,
    Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA

----------------------------------------------------------------------*/

#include <string.h>
#include <stdio.h>
#include "getopt.h"

char *optarg;
int optind = 1, opterr, optopt;
int pos = 0;
int getopt(int argc, char *argv[], const char *optstring) {
    //static int pos = 0;
    char *str;

    if (pos == 0) {
        if ((optind >= argc) || (*argv[optind] != '-'))
            return EOF;
        pos = 1;
        if (argv[optind][pos] == '\0')
            return EOF;
    }

    str = strchr(optstring, argv[optind][pos]);
    if (str == NULL) {
        optopt = argv[optind][pos];
        if (opterr)
            fprintf(stderr, "%s: illegal option -- %c\n", argv[0],
                    optopt);
        return '?';
    }

    if (str[1] == ':') {
        if (argv[optind][pos + 1] != '\0') {
            optarg = &argv[optind][pos + 1];
            return *str;
        }
        optind++;
        if (optind >= argc) {
            optopt = *str;
            if (opterr)
                fprintf(stderr, "%s: option requires an argument -- %c\n",
                        argv[0], optopt);
            return '?';
        }
        optarg = argv[optind];
        optind++;
        pos = 0;
        return *str;
    } else {
        pos++;
        if (argv[optind][pos] == '\0') {
            optind++;
            pos = 0;
        }
        return *str;
    }
}