#include <sys/socket.h> #include <netinet/in.h> #include <arpa/inet.h>
unsigned long inet_addr(cp) char *cp;
unsigned long inet_network(cp) char *cp;
char *inet_ntoa(in) struct in_addr in;
struct in_addr inet_makeaddr(net, lna) int net, lna;
int inet_lnaof(in) struct in_addr in;
int inet_netof(in) struct in_addr in;
All Internet address are returned in network order (bytes ordered from left to right). All network numbers and local address parts are returned as machine format integer values.
a.b.c.d a.b.c a.b a
When four parts are specified, each is interpreted as a byte of data and assigned, from left to right, to the four bytes of an Internet address.
When a three part address is specified, the last part is interpreted as a 16-bit quantity and placed in the right most two bytes of the network address. This makes the three part address format convenient for specifying Class B network addresses as ``128.net.host''.
When a two part address is supplied, the last part is interpreted as a 24-bit quantity and placed in the right most three bytes of the network address. This makes the two part address format convenient for specifying Class A network addresses as ``net.host''.
When only one part is given, the value is stored directly in the network address without any byte rearrangement.
All numbers supplied as ``parts'' in a ``.'' notation may be decimal, octal, or hexadecimal, as specified in the C language (i.e., a leading 0x or 0X implies hexadecimal; otherwise, a leading 0 implies octal; otherwise, the number is interpreted as decimal).
Created by unroff & hp-tools. © by Hans-Peter Bischof. All Rights Reserved (1997).
Last modified 21/April/97