ns_addr, ns_ntoa - Xerox NS(tm) address conversion routines
Standard C Library (libc, -lc)
ns_addr(const char *cp);
ns_ntoa(struct ns_addr ns);
The routine ns_addr() interprets character strings representing XNS
addresses, returning binary information suitable for use in system calls.
The routine ns_ntoa() takes XNS addresses and returns ASCII strings representing
the address in a notation in common use in the Xerox Development
<network number>.<host number>.<port number>
Trailing zero fields are suppressed, and each number is printed in hexadecimal,
in a format suitable for input to ns_addr(). Any fields lacking
super-decimal digits will have a trailing `H' appended.
Unfortunately, no universal standard exists for representing XNS
addresses. An effort has been made to ensure 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-networkorder
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 interpreted as octal is there is a leading `0' and there are no superoctal
digits. Otherwise, it is converted as a decimal number.
None. (See BUGS.)
ns(4), hosts(5), networks(5)
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.
BSD June 4, 1993 BSD
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