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->NS(3) System Library Functions Manual NS(3)
-
-NAME
- ns_addr, ns_ntoa - Xerox NS(tm) address conversion routines
-
-SYNOPSIS
- #include <sys/types.h>
- #include <netns/ns.h>
-
- struct ns_addr
- ns_addr(char *cp);
-
- char *
- ns_ntoa(struct ns_addr ns);
-
-DESCRIPTION
- 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-
- ment Environment:
-
- <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.
-
-RETURN VALUES
- None. (See BUGS.)
-
-SEE ALSO
- hosts(5), networks(5)
-
-HISTORY
- The ns_addr() and ns_toa() functions appeared in 4.3BSD.
-
-BUGS
- 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
- </PRE
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