Address Conversion

(1) Printable to Numeric: int inet_pton(int addressFamily, const char *src, void *dst)

(2) Numeric to Printable: const char* inet_ntop(int addressFamily, const void *src, char *dst, socklen_t dstBytes)

The dst is a pointer to a block of memory allocate in the caller space to hold the result.  The size of the block is determined by the address family.

For examples,

struct sockaddr_in servAddr;
int result = inet_pton(AF_INET, servIP, &servAddr.sin_addr.s_addr);

struct sockaddr_in clientAddr;
char clientName[INET_ADDRSTRLEN];  // INET_ADDRSTRLEN6 for IPV6
char *paddr = inet_ntop(AF_INET, &clintAddr.sin_addr.s_addr, clientName, sizeof(clientName));