/*
 * Description.
 *
 * Copyright (C) 1999-2009, Broadcom Corporation
 * 
 *      Unless you and Broadcom execute a separate written software license
 * agreement governing use of this software, this software is licensed to you
 * under the terms of the GNU General Public License version 2 (the "GPL"),
 * available at http://www.broadcom.com/licenses/GPLv2.php, with the
 * following added to such license:
 * 
 *      As a special exception, the copyright holders of this software give you
 * permission to link this software with independent modules, and to copy and
 * distribute the resulting executable under terms of your choice, provided that
 * you also meet, for each linked independent module, the terms and conditions of
 * the license of that module.  An independent module is a module which is not
 * derived from this software.  The special exception does not apply to any
 * modifications of the software.
 * 
 *      Notwithstanding the above, under no circumstances may you combine this
 * software in any way with any other Broadcom software provided under a license
 * other than the GPL, without Broadcom's express prior written consent.
 * $Id: miniopt.c,v 1.1.6.4 2009/09/25 00:32:01 Exp $
 */

/* ---- Include Files ---------------------------------------------------- */

#include <typedefs.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include "miniopt.h"


/* ---- Public Variables ------------------------------------------------- */
/* ---- Private Constants and Types -------------------------------------- */


/* ---- Private Variables ------------------------------------------------ */
/* ---- Private Function Prototypes -------------------------------------- */
/* ---- Functions -------------------------------------------------------- */

/* ----------------------------------------------------------------------- */
void
miniopt_init(miniopt_t *t, const char* name, const char* flags, bool longflags)
{
	static const char *null_flags = "";

	memset(t, 0, sizeof(miniopt_t));
	t->name = name;
	if (flags == NULL)
		t->flags = null_flags;
	else
		t->flags = flags;
	t->longflags = longflags;
}


/* ----------------------------------------------------------------------- */
int
miniopt(miniopt_t *t, char **argv)
{
	int keylen;
	char *p, *eq, *valstr, *endptr = NULL;
	int err = 0;

	t->consumed = 0;
	t->positional = FALSE;
	memset(t->key, 0, MINIOPT_MAXKEY);
	t->opt = '\0';
	t->valstr = NULL;
	t->good_int = FALSE;
	valstr = NULL;

	if (*argv == NULL) {
		err = -1;
		goto exit;
	}

	p = *argv++;
	t->consumed++;

	if (!t->opt_end && !strcmp(p, "--")) {
		t->opt_end = TRUE;
		if (*argv == NULL) {
			err = -1;
			goto exit;
		}
		p = *argv++;
		t->consumed++;
	}

	if (t->opt_end) {
		t->positional = TRUE;
		valstr = p;
	}
	else if (!strncmp(p, "--", 2)) {
		eq = strchr(p, '=');
		if (eq == NULL && !t->longflags) {
			fprintf(stderr,
				"%s: missing \" = \" in long param \"%s\"\n", t->name, p);
			err = 1;
			goto exit;
		}
		keylen = eq ? (eq - (p + 2)) : (int)strlen(p) - 2;
		if (keylen > 63) keylen = 63;
		memcpy(t->key, p + 2, keylen);

		if (eq) {
			valstr = eq + 1;
			if (*valstr == '\0') {
				fprintf(stderr,
				        "%s: missing value after \" = \" in long param \"%s\"\n",
				        t->name, p);
				err = 1;
				goto exit;
			}
		}
	}
	else if (!strncmp(p, "-", 1)) {
		t->opt = p[1];
		if (strlen(p) > 2) {
			fprintf(stderr,
				"%s: only single char options, error on param \"%s\"\n",
				t->name, p);
			err = 1;
			goto exit;
		}
		if (strchr(t->flags, t->opt)) {
			/* this is a flag option, no value expected */
			valstr = NULL;
		} else {
			if (*argv == NULL) {
				fprintf(stderr,
				"%s: missing value parameter after \"%s\"\n", t->name, p);
				err = 1;
				goto exit;
			}
			valstr = *argv;
			argv++;
			t->consumed++;
		}
	} else {
		t->positional = TRUE;
		valstr = p;
	}

	/* parse valstr as int just in case */
	if (valstr) {
		t->uval = (uint)strtoul(valstr, &endptr, 0);
		t->val = (int)t->uval;
		t->good_int = (*endptr == '\0');
	}

	t->valstr = valstr;

exit:
	if (err == 1)
		t->opt = '?';

	return err;
}