in_addr to string(char*)

The other day I needed to turn a IPv4 address to a string in C. I figured some others would find it useful:

char* hexToCharIP(struct in_addr addrIP)
{
  char* ip;
  unsigned int intIP;
  memcpy(&intIP, &addrIP,sizeof(unsigned int));
  int a = (intIP >> 24) & 0xFF;
  int b = (intIP >> 16) & 0xFF;
  int c = (intIP >> 8) & 0xFF;
  int d = intIP & 0xFF;
  if((ip = (char*)malloc(16*sizeof(char))) == NULL)
  {
    return NULL;
  }
  sprintf(ip, "%d.%d.%d.%d", d,c,b,a);
  return ip;
}