#include <stddef.h>
#include <string.h>

int strcmp(const char *a, const char *b)
{
  while (*a != '\0' && *b != '\0') {
    if (*a != *b)
      return (*a > *b) - (*a < *b);
    a++, b++;
  }
  if (*a == '\0' && *b == '\0')
    return 0;

  if (*a == '\0')
    return -1;
  return 1;
}

void *memcpy(void *dest, const void *src, size_t count)
{
  void *ret = dest;
  for (const byte_t *p = src; count > 0; --count, ++p, ++dest)
    *(byte_t *)dest = *p;

  return ret;
}

void *memzero(void *start, void *end)
{
  void *ret = start;
  for (byte_t *p = start; p < (byte_t *)end; ++p)
    *p = 0;
  
  return ret;
}