jas_getopt.c

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/*
 * Copyright (c) 1999-2000, Image Power, Inc. and the University of
 *   British Columbia.
 * Copyright (c) 2001-2002 Michael David Adams.
 * All rights reserved. 
 */

/* __START_OF_JASPER_LICENSE__
 * 
 * JasPer Software License
 * 
 * IMAGE POWER JPEG-2000 PUBLIC LICENSE
 * ************************************
 * 
 * GRANT:
 * 
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 * License Conditions
 * ******************
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 * MICHAEL DAVID ADAMS, ANY OTHER CONTRIBUTOR, OR ANY DISTRIBUTOR OF THE
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 * __END_OF_JASPER_LICENSE__
 */

/*
 * Command Line Option Parsing Library
 *
 * $Id$
 */

/******************************************************************************\
* Includes.
\******************************************************************************/

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

#include "jasper/jas_getopt.h"
#include "jasper/jas_math.h"

/******************************************************************************\
* Global data.
\******************************************************************************/

int jas_optind = 0;
int jas_opterr = 1;
char *jas_optarg = 0;

/******************************************************************************\
* Code.
\******************************************************************************/

static jas_opt_t *jas_optlookup(jas_opt_t *opts, char *name)
{
	jas_opt_t *opt;

	for (opt = opts; opt->id >= 0 && opt->name; ++opt) {
		if (!strcmp(opt->name, name)) {
			return opt;
		}
	}
	return 0;
}

int jas_getopt(int argc, char **argv, jas_opt_t *opts)
{
	char *cp;
	int id;
	int hasarg;
	jas_opt_t *opt;
	char *s;

	if (!jas_optind) {
		jas_optind = JAS_MIN(1, argc);
	}
	while (jas_optind < argc) {
		s = cp = argv[jas_optind];
		if (*cp == '-') {
			/* We are processing an option. */
			++jas_optind;
			if (*++cp == '-') {
				/* We are processing a long option. */
				++cp;
				if (*cp == '\0') {
					/* This is the end of the options. */
					return JAS_GETOPT_EOF;
				}
				if (!(opt = jas_optlookup(opts, cp))) {
					if (jas_opterr) {
						fprintf(stderr, "unknown long option %s\n", s);
					}
					return JAS_GETOPT_ERR;
				}
				hasarg = (opt->flags & JAS_OPT_HASARG) != 0;
				id = opt->id;
			} else {
				/* We are processing a short option. */
				if (strlen(cp) != 1 ||
				  !(opt = jas_optlookup(opts, cp))) {
					if (jas_opterr) {
						fprintf(stderr, "unknown short option %s\n", s);
					}
					return JAS_GETOPT_ERR;
				}
				hasarg = (opt->flags & JAS_OPT_HASARG) != 0;
				id = opt->id;
			}
			if (hasarg) {
				/* The option has an argument. */
				if (jas_optind >= argc) {
					if (jas_opterr) {
						fprintf(stderr, "missing argument for option %s\n", s);
					}
					return JAS_GETOPT_ERR;
				}
				jas_optarg = argv[jas_optind];
				++jas_optind;
			} else {
				/* The option does not have an argument. */
				jas_optarg = 0;
			}
			return id;
		} else {
			/* We are not processing an option. */
			return JAS_GETOPT_EOF;
		}
	}
	return JAS_GETOPT_EOF;
}