pollution: htonl
uint32_t htonl(uint32_t) __attribute__((__const__)); 

pollution: htons
uint16_t htons(uint16_t) __attribute__((__const__)); 

pollution: ntohl
uint32_t ntohl(uint32_t) __attribute__((__const__)); 

pollution: ntohs
uint16_t ntohs(uint16_t) __attribute__((__const__));