ns(3) - NetBSD Manual Pages

NS(3)                   NetBSD Library Functions Manual                  NS(3)


NAME
ns_addr, ns_ntoa -- Xerox NS(tm) address conversion routines
LIBRARY
Standard C Library (libc, -lc)
SYNOPSIS
#include <sys/types.h> #include <netns/ns.h> struct ns_addr ns_addr(const 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 hexa- decimal, 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 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 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 separat- ing the millennia. Next, the field is assumed to be a number: It is interpreted as hexadecimal if there is a leading `0x' (as in C), a trail- ing `H' (as in Mesa), or there are any super-decimal digits present. It is interpreted as octal if there is a leading `0' and there are no super- octal digits. Otherwise, it is converted as a decimal number.
RETURN VALUES
None. (See BUGS.)
SEE ALSO
ns(4), 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. NetBSD 3.0.1 June 4, 1993 NetBSD 3.0.1

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