Comtrol eCos - Manual (Page 548)

Chapter 38. TCP/IP Library Reference
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 number 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
link_addr
LINK_ADDR(3) System Library Functions Manual LINK_ADDR(3)
NAME
link_addr, link_ntoa - elementary address specification routines for link
level access
SYNOPSIS
#include < sys/types.h>
#include < sys/socket.h>
#include < net/if_dl.h>
void
link_addr(const char *addr, struct sockaddr_dl *sdl);
char *
link_ntoa(const struct sockaddr_dl *sdl);
DESCRIPTION
The link_addr() function interprets character strings representing link-
level addresses, returning binary information suitable for use in system
calls. link_ntoa() takes a link-level address and returns an ASCII
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