#include <types.h>

size_t strlen(const char* s)
{
	char *p = (char*)s;
	while (*p) p++;
	return p - s;
}

uint64_t stoi(const char *s)
{
	uint64_t num = 0;
	size_t n = strlen(s);

	for (size_t i = 0; i < n; i++) {
		num *= 10;
		num += s[i] - '0';
	}

	return num;
}

void strrev(char *s)
{
	size_t n = strlen(s);
	char a[100];
	for (size_t i = 0; i < n; i++) {
		a[i] = s[n - 1 - i];
	}
	for (size_t i = 0; i < n; i++) {
		s[i] = a[i];
	}
}

void itos(uint64_t num, char* s)
{
	size_t i;
	for (i = 0; num; num/=10, i++) {
		s[i] = '0' + num%10;
	}
	s[i] = '\0';
	strrev(s);
}