# 2.11BSD#431 - /usr/man/cat3/inet.0

    INET(3N)	    UNIX Programmer's Manual		 INET(3N)

    NAME
         inet_addr, inet_network, inet_ntoa, inet_makeaddr,
         inet_lnaof, inet_netof - Internet address manipulation rou-
         tines

    SYNOPSIS
         #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)
         long net, lna;

         long inet_lnaof(in)
         struct in_addr in;

         long inet_netof(in)
         struct in_addr in;

    DESCRIPTION
         The routines inet_addr and inet_network each interpret char-
         acter strings representing numbers expressed in the Internet
         standard "." notation, returning numbers suitable for use as
         Internet addresses and Internet network numbers, respec-
         tively.  The routine inet_ntoa takes an Internet address and
         returns an ASCII string representing the address in "."
         notation.	The routine inet_makeaddr takes an Internet net-
         work number and a local network address and constructs an
         Internet address from it.	The routines inet_netof and
         inet_lnaof break apart Internet host addresses, returning
         the network number and local network address part, respec-
         tively.

         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.

    INTERNET ADDRESSES
         Values specified using the "." notation take one of the fol-
         lowing forms:
    	  a.b.c.d
    	  a.b.c
    	  a.b

    Printed 11/26/99	  May 27, 1986				1

    INET(3N)	    UNIX Programmer's Manual		 INET(3N)

    	  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.  Note that when an Internet address
         is viewed as a 32-bit integer quantity on the VAX the bytes
         referred to above appear as "d.c.b.a".  That is, VAX bytes
         are ordered from right to left.

         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 net-
         work addresses as "128.net.host".

         When a two part address is supplied, the last part is inter-
         preted 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; oth-
         erwise, a leading 0 implies octal; otherwise, the number is
         interpreted as decimal).

    SEE ALSO
         gethostbyname(3N), getnetent(3N), hosts(5), networks(5),

    DIAGNOSTICS
         The value -1 is returned by inet_addr and inet_network for
         malformed requests.

    BUGS
         The problem of host byte ordering versus network byte order-
         ing is confusing.	A simple way to specify Class C network
         addresses in a manner similar to that for Class B and Class
         A is needed.  The string returned by inet_ntoa resides in a
         static memory area.
         Inet_addr should return a struct in_addr.

    Printed 11/26/99	  May 27, 1986				2

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