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));
}