NS(3) BSD Library Functions 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
addresses, 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
addresses. An effort has been made to ensure that ns_addr() be compati-
ble 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 sub-
field 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 interpreted as octal is there is a
leading '0' and there are no super-octal digits. Otherwise, it is con-
verted 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.
BSD June 4, 1993 BSD