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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 &lt;sys/types.h&#62;
     #include &lt;netns/ns.h&#62;
 
     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:
 
           &lt;network number&#62;.&lt;host number&#62;.&lt;port number&#62;
 
     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
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1	28	unneback	`<!-- Copyright (C) 2003 Red Hat, Inc. -->`
2			`<!-- This material may be distributed only subject to the terms -->`
3			`<!-- and conditions set forth in the Open Publication License, v1.0 -->`
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94			`>NS(3) System Library Functions Manual NS(3)`
95
96			`NAME`
97			`ns_addr, ns_ntoa - Xerox NS(tm) address conversion routines`
98
99			`SYNOPSIS`
100			`#include <sys/types.h>`
101			`#include <netns/ns.h>`
102
103			`struct ns_addr`
104			`ns_addr(char *cp);`
105
106			`char *`
107			`ns_ntoa(struct ns_addr ns);`
108
109			`DESCRIPTION`
110			`The routine ns_addr() interprets character strings representing XNS`
111			`addresses, returning binary information suitable for use in system calls.`
112			`The routine ns_ntoa() takes XNS addresses and returns ASCII strings rep-`
113			`resenting the address in a notation in common use in the Xerox Develop-`
114			`ment Environment:`
115
116			`<network number>.<host number>.<port number>`
117
118			`Trailing zero fields are suppressed, and each number is printed in hex-`
119			`adecimal, in a format suitable for input to ns_addr(). Any fields lack-`
120			ing super-decimal digits will have a trailing `H' appended.
121
122			`Unfortunately, no universal standard exists for representing XNS`
123			`addresses. An effort has been made to ensure that ns_addr() be compati-`
124			`ble with most formats in common use. It will first separate an address`
125			into 1 to 3 fields using a single delimiter chosen from period (`.'),
126			colon (`:'), or pound-sign `#'. Each field is then examined for byte
127			`separators (colon or period). If there are byte separators, each sub-`
128			`field separated is taken to be a small hexadecimal number, and the`
129			`entirety is taken as a network-byte-ordered quantity to be zero extended`
130			`in the high-network-order bytes. Next, the field is inspected for`
131			`hyphens, in which case the field is assumed to be a number in decimal`
132			`notation with hyphens separating the millenia. Next, the field is`
133			`assumed to be a number: It is interpreted as hexadecimal if there is a`
134			leading `0x' (as in C), a trailing `H' (as in Mesa), or there are any
135			`super-decimal digits present. It is interpreted as octal is there is a`
136			leading `0' and there are no super-octal digits. Otherwise, it is con-
137			`verted as a decimal number.`
138
139			`RETURN VALUES`
140			`None. (See BUGS.)`
141
142			`SEE ALSO`
143			`hosts(5), networks(5)`
144
145			`HISTORY`
146			`The ns_addr() and ns_toa() functions appeared in 4.3BSD.`
147
148			`BUGS`
149			`The string returned by ns_ntoa() resides in a static memory area. The`
150			`function ns_addr() should diagnose improperly formed input, and there`
151			`should be an unambiguous way to recognize this.`
152
153			`BSD June 4, 1993 BSD`
154			`</PRE`
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