NS(3) BSD Programmer's Manual NS(3)
ns_addr, ns_ntoa - Xerox NS(tm) address conversion routines
ns_ntoa(struct ns_addr ns);
The routine ns_addr() interprets character strings representing XNS ad-
dresses, returning binary information suitable for use in system calls.
The routine ns_ntoa() takes XNS addresses and returns ASCII strings rep-
resenting the address in a notation in common use in the Xerox Develop-
<network number>.<host number>.<port number>
Trailing zero fields are suppressed, and each number is printed in hex-
adecimal, in a format suitable for input to ns_addr(). Any fields lack-
ing super-decimal digits will have a trailing `H' appended.
Unfortunately, no universal standard exists for representing XNS address-
es. An effort has been made to insure that ns_addr() be compatible with
most formats in common use. It will first separate an address into 1 to
3 fields using a single delimiter chosen from period `.', colon `:' or
pound-sign `#'. Each field is then examined for byte separators (colon or
period). If there are byte separators, each subfield separated is taken
to be a small hexadecimal number, and the entirety is taken as a network-
byte-ordered quantity to be zero extended in the high-network-order
bytes. Next, the field is inspected for hyphens, in which case the field
is assumed to be a number in decimal notation with hyphens separating the
millenia. Next, the field is assumed to be a number: It is interpreted
as hexadecimal if there is a leading `0x' (as in C), a trailing `H' (as
in Mesa), or there are any super-decimal digits present. It is inter-
preted as octal is there is a leading `0' and there are no super-octal
digits. Otherwise, it is converted as a decimal number.
None. (See BUGS.)
The ns_addr() and ns_toa() functions appeared in 4.3BSD.
The string returned by ns_ntoa() resides in a static memory area. The
function ns_addr() should diagnose improperly formed input, and there
should be an unambiguous way to recognize this.
4.3 Berkeley Distribution June 4, 1993 1