SplenkOS/kernel/src/cstr.cpp

#include "cstr.h"

char uintTo_StringOutput[128];
const char* to_string(uint64_t value) {
	uint8_t size = 0;
	uint64_t sizeTest = value;

	while (sizeTest / 10 > 0) {
		sizeTest /= 10;
		size++;
	}

	uint8_t index = 0;
	while (value / 10 > 0) {
		uint8_t remainder = value % 10;
		value /= 10;
		uintTo_StringOutput[size - index] = remainder + '0';
		index++;
	}

	uint8_t remainder = value % 10;
	uintTo_StringOutput[size - index] = remainder + '0';
	uintTo_StringOutput[size + 1] = 0;

	return uintTo_StringOutput;
}

char intTo_StringOutput[128];
const char* to_string(int64_t value) {
	uint8_t isNegative = 0;

	if (value < 0) {
		isNegative = 1;
		value *= -1;
		intTo_StringOutput[0] = '-';
	}

	uint8_t size = 0;
	uint64_t sizeTest = value;

	while (sizeTest / 10 > 0) {
		sizeTest /= 10;
		size++;
	}

	uint8_t index = 0;
	while (value / 10 > 0) {
		uint8_t remainder = value % 10;
		value /= 10;
		intTo_StringOutput[isNegative + size - index] = remainder + '0';
		index++;
	}

	uint8_t remainder = value % 10;
	intTo_StringOutput[isNegative + size - index] = remainder + '0';
	intTo_StringOutput[isNegative + size + 1] = 0;

	return intTo_StringOutput;
}

char doubleTo_StringOutput[128];
const char* to_string(double value, uint8_t decimalPlaces) {
	char* intPtr = (char*)to_string((int64_t)value);
	char* doublePtr = doubleTo_StringOutput;

	if (value < 0) {
		value *= -1;
	}

	while (*intPtr != 0) {
		*doublePtr = *intPtr;
		intPtr++;
		doublePtr++;
	}

	*doublePtr = '.';
	doublePtr++;

	double newValue = value - (int)value; // get only the decimal places

	for (uint8_t i = 0; i < decimalPlaces; i++) {
		newValue *= 10;
		*doublePtr = (int)newValue + '0';
		newValue -= (int)newValue;
		doublePtr++;
	}

	*doublePtr = 0;
	return doubleTo_StringOutput;
}