fxlibc/src/stdlib/strtoull.c

#include "stdlib_p.h"
#include <errno.h>

unsigned long long int strtoull(char const * restrict ptr,
	char ** restrict endptr, int base)
{
	unsigned long long n = 0;
	int err = __strto_int(ptr, endptr, base, NULL, (long long *)&n, true);
	if(err != 0) errno = err;
	return n;
}