/******************************************************************************
 *
 *                Copyright (c) 2017-2019 by Löwenware Ltd
 *             Please, refer LICENSE file for legal information
 *
 ******************************************************************************/

/**
 * @file log.c
 * @author Ilja Kartašov <ik@lowenware.com>
 * @brief 
 *
 * @see https://lowenware.com/
 */

#include <device/uart/uart.h>
#include "log.h"

void
k_log_init(void)
{
	uart_init();
}

Ki32
k_logs(const Ki8 *string)
{
	Ki8 c;
	const Ki8 *p = string;
	while((c = *p) != 0) {
		if (uart_write(c))
			return -1;
		p++;
	}
	return (Ki32)(p - string);
}

Ki32
k_logi(Ki64 value, Ku8 base)
{
	Ki32 result;

	if (value < 0) {
		if (uart_write('-'))
			return -1;
		value = -value;
		result = 1;
	} else {
		result = 0;
	}
	result += k_logu(value, base);
	return (result) ? result : -1;
}

Ki32
k_logu(Ku64 value, Ku8 base)
{
	Ki32 i = 0, result;
	Ku8 buffer[64];

	if (!value) {
		return (uart_write('0')) ? -1 : 1;
	}

	do {
		if (!(i < (sizeof(buffer) / sizeof(buffer[0]))))
			return -1;

		Ku64 r = value % base;
		buffer[i++] = (r < 0x0A) ? '0' + r : 'A' + r - 0x0A;
    value /= base; 
	} while (value);

	result = i;

	while (i--) {
		if (uart_write(buffer[i]))
			return -1;
	}
	return result;
}