Syncboot/kernel/utils.c

#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;
	}
}