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

 * <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. */

#include <stdio.h>

#include <string.h>

#ifdef __cplusplus

extern "C" {

#endif

int _PyOS_opterr = 1;          /* generate error messages */

int _PyOS_optind = 1;          /* index into argv array   */

char *_PyOS_optarg = NULL;     /* optional argument       */

int _PyOS_GetOpt(int argc, char **argv, char *optstring)

{

	static char *opt_ptr = "";

	char *ptr;

	int option;

	if (*opt_ptr == '\0') {

		if (_PyOS_optind >= argc)

			return -1;

#ifdef MS_WINDOWS

		else if (strcmp(argv[_PyOS_optind], "/?") == 0) {

			++_PyOS_optind;

			return 'h';

		}

#endif

		else if (argv[_PyOS_optind][0] != '-' ||

		         argv[_PyOS_optind][1] == '\0' /* lone dash */ )

			return -1;

		else if (strcmp(argv[_PyOS_optind], "--") == 0) {

			++_PyOS_optind;

			return -1;

		}

		else if (strcmp(argv[_PyOS_optind], "--help") == 0) {

			++_PyOS_optind;

			return 'h';

		}

		else if (strcmp(argv[_PyOS_optind], "--version") == 0) {

			++_PyOS_optind;

			return 'V';

		}

		opt_ptr = &argv[_PyOS_optind++][1]; 

	}

	if ( (option = *opt_ptr++) == '\0')

		return -1;

	if (option == 'J') {

		fprintf(stderr, "-J is reserved for Jython\n");

		return '_';

	}

	if (option == 'X') {

		fprintf(stderr,

		  "-X is reserved for implementation-specific arguments\n");

		return '_';

	}

	if ((ptr = strchr(optstring, option)) == NULL) {

		if (_PyOS_opterr)

			fprintf(stderr, "Unknown option: -%c\n", option);

		return '_';

	}

	if (*(ptr + 1) == ':') {

		if (*opt_ptr != '\0') {

			_PyOS_optarg  = opt_ptr;

			opt_ptr = "";

		}

		else {

			if (_PyOS_optind >= argc) {

				if (_PyOS_opterr)

					fprintf(stderr,

			    "Argument expected for the -%c option\n", option);

				return '_';

			}

			_PyOS_optarg = argv[_PyOS_optind++];

		}

	}

	return option;

}

#ifdef __cplusplus

}

#endif