Syncboot/kernel/utils.c

#include <kernel/utils.h>
#include <stddef.h>
#include <stdint.h>
#include <stdbool.h>
#include <stddef.h>

size_t strlen(const char* string) {
	size_t size = 0;
	while (string[size]) 
		size++;
	return size;
}

unsigned char inb(unsigned short port) {
	unsigned char ptr;
	asm volatile("inb %1, %0" : "=a" (ptr) : "dN" (port));
	return ptr;
}

void outb(unsigned short port, unsigned char data) {
	asm volatile("outb %1, %0" : : "dN" (port), "a" (data));
}

void memcpy(void* dest, void* src, size_t n) {
	char* src_c  = (char*)src;
	char* dest_c = (char*)dest;
	
	for(size_t i = 0; i < n; i++) {
		dest_c[i] = src_c[i];
	}
}

void memset(void* src, int chr, size_t n) {
	unsigned char* ptr = src;
	while(n--) {
		*ptr++ = (unsigned char) chr;
	}
}

void int_to_ascii(int num, char* string) {
	size_t i = 0; //Counter.
	//TODO: Convert this to a for-loop?
	int32_t calc = 0;
	bool negative = false;
	
	if(num == 0) {
		string[0] = '0';
		string[1] = '\0';
		return;
	}
	
	if(num < 0) {
		negative = true;
		num = -num;
	}
	
	while(num != 0) {
		calc = num % 10;
		num = num / 10;
		calc += 48;
		
		string[i] = calc;
		i++;
	}
	
	if(negative) {
		string[i] = '-';
		i++;
	}
	
	for(size_t j = 0; j < i/2; j++) {
		calc = string[j];
		string[j] = string[i-j-1];
		string[j-i-1] = calc;
	}
}

char* itoc(size_t num) {
	char* result;
	size_t tmp_value;
	do {
		tmp_value = num;
		num /= 10;
		*result++ = "zyxwvutsrqponmlkjihgfedcba9876543210123456789abcdefghijklmnopqrstuvwxyz" [35 + (tmp_value - num * 10)];
	}while (num);

	return result;
}

void int_to_hex(int num, char* string) {
	empty_string(string);
	
	uint8_t i = 8;
	uint8_t temp = 0;
	
	while(i != 0) {
		i--;
		temp = num & 0xF;
		num = num >> 4;
		
		if(temp >= 10) {
			temp += 7;
		}
		
		temp += 48;
		string[i] = temp;
	}
}

void empty_string(char* string) {
	size_t len = strlen(string);
	
	for(size_t i = 0; i < len + 1; i++) {
		string[i] = '\0';
	}
}