Code Sample:Network Address Conversion Routines
Beginners Guide to Sockets
(Continued from previous question...)
Code Sample:Network Address Conversion Routines
Network Address Conversion Routines
#include <sys/types.h>
#include <sys/socket.h>
#include <netinet/in.h>
/* in_addr structure */
unsigned long inet_addr(char *ptr)
char *inet_ntoa(struct in_addr inaddr)
inet_addr() converts a character string in dotted-decimal notation to a
32-bit Internet address. The return value is not consistent,
unfortunately. The correct return should be a pointer to a structure of
type in_addr but many systems, following an older convention, return
only the internal representation of the dotted-decimal notation. The
man pages will clarify the situation for the host system on which the
function is used.
inet_ntoa() expects a structure of type in_addr as a parameter (note
that the structure itself is passed, not a pointer) and returns a
pointer to a character string containing the dotted-decimal
representation of the Internet address.
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