ISO_ADDR(3)						   BSD Library Functions Manual 					       ISO_ADDR(3)

NAME

     iso_addr, iso_ntoa -- elementary network address conversion routines for Open System Interconnection

LIBRARY

     Standard C Library (libc, -lc)

SYNOPSIS

     #include <sys/types.h>
     #include <netiso/iso.h>

     struct iso_addr *
     iso_addr(const char *cp);

     char *
     iso_ntoa(struct iso_addr *isoa);

DESCRIPTION

     The routine iso_addr() interprets character strings representing OSI addresses, returning binary information suitable for use in system
     calls.  The routine iso_ntoa() takes OSI addresses and returns ASCII strings representing NSAPs (network service access points) in a notation
     inverse to that accepted by iso_addr().

     Unfortunately, no universal standard exists for representing OSI network addresses.

     The format employed by iso_addr() is a sequence of hexadecimal ``digits'' (optionally separated by periods), of the form:

	   <hex digits>.<hex digits>.<hex digits>

     Each pair of hexadecimal digits represents a byte with the leading digit indicating the higher-ordered bits.  A period following an even num-
     ber of bytes has no effect (but may be used to increase legibility).  A period following an odd number of bytes has the effect of causing the
     byte of address being translated to have its higher order bits filled with zeros.

RETURN VALUES

     iso_ntoa() always returns a null terminated string.  iso_addr() always returns a pointer to a struct iso_addr.  (See BUGS.)

SEE ALSO

     iso(4)

HISTORY

     The iso_addr() and iso_ntoa() functions appeared in 4.3BSD-Reno.

BUGS

     The returned values reside in a static memory area.

     The function iso_addr() should diagnose improperly formed input, and there should be an unambiguous way to recognize this.

BSD
								   June 4, 1993 							       BSD