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>INET_NET(3)             System Library Functions Manual            INET_NET(3)
 
NAME
     inet_net_ntop, inet_net_pton - Internet network number manipulation rou-
     tines
 
SYNOPSIS
     #include &lt;sys/socket.h&#62;
     #include &lt;netinet/in.h&#62;
     #include &lt;arpa/inet.h&#62;
 
     char *
     inet_net_ntop(int af, const void *src, int bits, char *dst, size_t size);
 
     int
     inet_net_pton(int af, const char *src, void *dst, size_t size);
 
DESCRIPTION
     The inet_net_ntop() function converts an Internet network number from
     network format (usually a struct in_addr or some other binary form, in
     network byte order) to CIDR presentation format (suitable for external
     display purposes).  bits is the number of bits in src that are the net-
     work number.  It returns NULL if a system error occurs (in which case,
     errno will have been set), or it returns a pointer to the destination
     string.
 
     The inet_net_pton() function converts a presentation format Internet net-
     work number (that is, printable form as held in a character string) to
     network format (usually a struct in_addr or some other internal binary
     representation, in network byte order).  It returns the number of bits
     (either computed based on the class, or specified with /CIDR), or -1 if a
     failure occurred (in which case errno will have been set.  It will be set
     to ENOENT if the Internet network number was not valid).
 
     The only value for af currently supported is AF_INET.  size is the size
     of the result buffer dst.
 
NETWORK NUMBERS (IP VERSION 4)
     Internet network numbers may be specified in one of the following forms:
 
           a.b.c.d/bits
           a.b.c.d
           a.b.c
           a.b
           a
 
     When four parts are specified, each is interpreted as a byte of data and
     assigned, from left to right, to the four bytes of an Internet network
     number.  Note that when an Internet network number is viewed as a 32-bit
     integer quantity on a system that uses little-endian byte order (such as
     the Intel 386, 486, and Pentium processors) the bytes referred to above
     appear as ``d.c.b.a''.  That is, little-endian bytes are ordered from
     right to left.
 
     When a three part number is specified, the last part is interpreted as a
     16-bit quantity and placed in the rightmost two bytes of the Internet
     network number.  This makes the three part number format convenient for
     specifying Class B network numbers as ``128.net.host''.
 
     When a two part number is supplied, the last part is interpreted as a
     24-bit quantity and placed in the rightmost three bytes of the Internet
     network number.  This makes the two part number format convenient for
     specifying Class A network numbers as ``net.host''.
 
     When only one part is given, the value is stored directly in the Internet
     network number without any byte rearrangement.
 
     All numbers supplied as ``parts'' in a `.' notation may be decimal,
     octal, or hexadecimal, as specified in the C language (i.e., a leading 0x
     or 0X implies hexadecimal; otherwise, a leading 0 implies octal; other-
     wise, the number is interpreted as decimal).
 
SEE ALSO
     byteorder(3), inet(3), networks(5)
 
HISTORY
     The inet_net_ntop and inet_net_pton functions first appeared in BIND
     4.9.4.
 
BSD                              June 18, 1997                             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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85			`NAME="NET-COMMON-TCPIP-MANPAGES-INET-NET">inet_net</H1`
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93			`CLASS="SCREEN"`
94			`>INET_NET(3) System Library Functions Manual INET_NET(3)`
95
96			`NAME`
97			`inet_net_ntop, inet_net_pton - Internet network number manipulation rou-`
98			`tines`
99
100			`SYNOPSIS`
101			`#include <sys/socket.h>`
102			`#include <netinet/in.h>`
103			`#include <arpa/inet.h>`
104
105			`char *`
106			`inet_net_ntop(int af, const void src, int bits, char dst, size_t size);`
107
108			`int`
109			`inet_net_pton(int af, const char src, void dst, size_t size);`
110
111			`DESCRIPTION`
112			`The inet_net_ntop() function converts an Internet network number from`
113			`network format (usually a struct in_addr or some other binary form, in`
114			`network byte order) to CIDR presentation format (suitable for external`
115			`display purposes). bits is the number of bits in src that are the net-`
116			`work number. It returns NULL if a system error occurs (in which case,`
117			`errno will have been set), or it returns a pointer to the destination`
118			`string.`
119
120			`The inet_net_pton() function converts a presentation format Internet net-`
121			`work number (that is, printable form as held in a character string) to`
122			`network format (usually a struct in_addr or some other internal binary`
123			`representation, in network byte order). It returns the number of bits`
124			`(either computed based on the class, or specified with /CIDR), or -1 if a`
125			`failure occurred (in which case errno will have been set. It will be set`
126			`to ENOENT if the Internet network number was not valid).`
127
128			`The only value for af currently supported is AF_INET. size is the size`
129			`of the result buffer dst.`
130
131			`NETWORK NUMBERS (IP VERSION 4)`
132			`Internet network numbers may be specified in one of the following forms:`
133
134			`a.b.c.d/bits`
135			`a.b.c.d`
136			`a.b.c`
137			`a.b`
138			`a`
139
140			`When four parts are specified, each is interpreted as a byte of data and`
141			`assigned, from left to right, to the four bytes of an Internet network`
142			`number. Note that when an Internet network number is viewed as a 32-bit`
143			`integer quantity on a system that uses little-endian byte order (such as`
144			`the Intel 386, 486, and Pentium processors) the bytes referred to above`
145			appear as ``d.c.b.a''. That is, little-endian bytes are ordered from
146			`right to left.`
147
148			`When a three part number is specified, the last part is interpreted as a`
149			`16-bit quantity and placed in the rightmost two bytes of the Internet`
150			`network number. This makes the three part number format convenient for`
151			specifying Class B network numbers as ``128.net.host''.
152
153			`When a two part number is supplied, the last part is interpreted as a`
154			`24-bit quantity and placed in the rightmost three bytes of the Internet`
155			`network number. This makes the two part number format convenient for`
156			specifying Class A network numbers as ``net.host''.
157
158			`When only one part is given, the value is stored directly in the Internet`
159			`network number without any byte rearrangement.`
160
161			All numbers supplied as ``parts'' in a `.' notation may be decimal,
162			`octal, or hexadecimal, as specified in the C language (i.e., a leading 0x`
163			`or 0X implies hexadecimal; otherwise, a leading 0 implies octal; other-`
164			`wise, the number is interpreted as decimal).`
165
166			`SEE ALSO`
167			`byteorder(3), inet(3), networks(5)`
168
169			`HISTORY`
170			`The inet_net_ntop and inet_net_pton functions first appeared in BIND`
171			`4.9.4.`
172
173			`BSD June 18, 1997 BSD`
174			`</PRE`
175			`></TD`
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