/*
 * Description.
 *
 * Copyright (C) 2017, Broadcom. All Rights Reserved.
 * 
 * Permission to use, copy, modify, and/or distribute this software for any
 * purpose with or without fee is hereby granted, provided that the above
 * copyright notice and this permission notice appear in all copies.
 * 
 * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
 * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
 * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY
 * SPECIAL, DIRECT, 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.
 *
 *
 * <<Broadcom-WL-IPTag/Open:>>
 *
 * $Id: miniopt.c 514727 2014-11-12 03:02:48Z $
 */

/* ---- 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 ? (int)(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;
}