inet_ntoa man page on NeXTSTEP

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INET(3N)							      INET(3N)

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

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)
       int net, lna;

       int inet_lnaof(in)
       struct in_addr in;

       int inet_netof(in)
       struct in_addr in;

DESCRIPTION
       The  routines  inet_addr	 and  inet_network  each  interpret  character
       strings	representing  numbers  expressed  in the Internet standard “.”
       notation, returning numbers suitable for use as Internet addresses  and
       Internet network numbers, respectively.	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 network
       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, respectively.

       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 following
       forms:
	      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).

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 ordering 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.

4.2 Berkeley Distribution	 May 27, 1986			      INET(3N)
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