/*-*- mode:c;indent-tabs-mode:nil;c-basic-offset:4;tab-width:8;coding:utf-8 -*-â
âvi: set net ft=c ts=4 sts=4 sw=4 fenc=utf-8                                :viâ
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â Python 3                                                                     â
â https://docs.python.org/3/license.html                                       â
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#include "libc/stdio/stdio.h"
#include "libc/str/str.h"
#include "third_party/python/Include/pygetopt.h"
/* clang-format off */

asm(".ident\t\"\\n\\n\
python getopt (isc license)\\n\
Copyright 1992-1994 David Gottner\"");
/* clang-format off */

/*---------------------------------------------------------------------------*
 * <RCS keywords>
 *
 * C++ Library
 *
 * Copyright 1992-1994, David Gottner
 *
 *                    All Rights Reserved
 *
 * Permission to use, copy, modify, and distribute this software and its
 * documentation for any purpose and without fee is hereby granted,
 * provided that the above copyright notice, this permission notice and
 * the following disclaimer notice appear unmodified in all copies.
 *
 * I DISCLAIM ALL WARRANTIES WITH REGARD TO THIS SOFTWARE, INCLUDING ALL
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS.  IN NO EVENT SHALL I
 * BE LIABLE FOR ANY SPECIAL, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY
 * DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA, OR PROFITS, WHETHER
 * IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT
 * OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
 *
 * Nevertheless, I would like to know about bugs in this library or
 * suggestions for improvment.  Send bug reports and feedback to
 * davegottner@delphi.com.
 *---------------------------------------------------------------------------*/

/* Modified to support --help and --version, as well as /? on Windows
 * by Georg Brandl. */

int _PyOS_opterr = 1;          /* generate error messages */
int _PyOS_optind = 1;          /* index into argv array   */
wchar_t *_PyOS_optarg = NULL;     /* optional argument       */

static wchar_t *opt_ptr = L"";

void _PyOS_ResetGetOpt(void)
{
    _PyOS_opterr = 1;
    _PyOS_optind = 1;
    _PyOS_optarg = NULL;
    opt_ptr = L"";
}

int _PyOS_GetOpt(int argc, wchar_t **argv, wchar_t *optstring)
{
    wchar_t *ptr;
    wchar_t option;
    if (*opt_ptr == '\0') {
        if (_PyOS_optind >= argc)
            return -1;
#ifdef MS_WINDOWS
        else if (wcscmp(argv[_PyOS_optind], L"/?") == 0) {
            ++_PyOS_optind;
            return 'h';
        }
#endif
        else if (argv[_PyOS_optind][0] != L'-' ||
                 argv[_PyOS_optind][1] == L'\0' /* lone dash */ )
            return -1;
        else if (wcscmp(argv[_PyOS_optind], L"--") == 0) {
            ++_PyOS_optind;
            return -1;
        }
        else if (wcscmp(argv[_PyOS_optind], L"--help") == 0) {
            ++_PyOS_optind;
            return 'h';
        }
        else if (wcscmp(argv[_PyOS_optind], L"--version") == 0) {
            ++_PyOS_optind;
            return 'V';
        }
        opt_ptr = &argv[_PyOS_optind++][1];
    }
    if ((option = *opt_ptr++) == L'\0')
        return -1;
    if (option == 'J') {
        if (_PyOS_opterr)
            fprintf(stderr, "-J is reserved for Jython\n");
        return '_';
    }
    if ((ptr = wcschr(optstring, option)) == NULL) {
        if (_PyOS_opterr)
            fprintf(stderr, "Unknown option: -%c\n", (char)option);
        return '_';
    }
    if (*(ptr + 1) == L':') {
        if (*opt_ptr != L'\0') {
            _PyOS_optarg  = opt_ptr;
            opt_ptr = L"";
        }
        else {
            if (_PyOS_optind >= argc) {
                if (_PyOS_opterr)
                    fprintf(stderr,
                        "Argument expected for the -%c option\n", (char)option);
                return '_';
            }
            _PyOS_optarg = argv[_PyOS_optind++];
        }
    }
    return option;
}
