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>Chapter 38. TCP/IP Library Reference</TD
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>INET_NET(3)             System Library Functions Manual            INET_NET(3)
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NAME
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     inet_net_ntop, inet_net_pton - Internet network number manipulation rou-
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     tines
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SYNOPSIS
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     #include &lt;sys/socket.h&#62;
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     #include &lt;netinet/in.h&#62;
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     #include &lt;arpa/inet.h&#62;
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     char *
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     inet_net_ntop(int af, const void *src, int bits, char *dst, size_t size);
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     int
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     inet_net_pton(int af, const char *src, void *dst, size_t size);
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DESCRIPTION
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     The inet_net_ntop() function converts an Internet network number from
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     network format (usually a struct in_addr or some other binary form, in
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     network byte order) to CIDR presentation format (suitable for external
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     display purposes).  bits is the number of bits in src that are the net-
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     work number.  It returns NULL if a system error occurs (in which case,
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     errno will have been set), or it returns a pointer to the destination
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     string.
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     The inet_net_pton() function converts a presentation format Internet net-
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     work number (that is, printable form as held in a character string) to
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     network format (usually a struct in_addr or some other internal binary
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     representation, in network byte order).  It returns the number of bits
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     (either computed based on the class, or specified with /CIDR), or -1 if a
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     failure occurred (in which case errno will have been set.  It will be set
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     to ENOENT if the Internet network number was not valid).
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     The only value for af currently supported is AF_INET.  size is the size
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     of the result buffer dst.
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NETWORK NUMBERS (IP VERSION 4)
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     Internet network numbers may be specified in one of the following forms:
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           a.b.c.d/bits
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           a.b.c.d
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           a.b.c
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           a.b
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           a
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     When four parts are specified, each is interpreted as a byte of data and
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     assigned, from left to right, to the four bytes of an Internet network
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     number.  Note that when an Internet network number is viewed as a 32-bit
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     integer quantity on a system that uses little-endian byte order (such as
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     the Intel 386, 486, and Pentium processors) the bytes referred to above
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     appear as ``d.c.b.a''.  That is, little-endian bytes are ordered from
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     right to left.
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     When a three part number is specified, the last part is interpreted as a
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     16-bit quantity and placed in the rightmost two bytes of the Internet
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     network number.  This makes the three part number format convenient for
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     specifying Class B network numbers as ``128.net.host''.
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     When a two part number is supplied, the last part is interpreted as a
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     24-bit quantity and placed in the rightmost three bytes of the Internet
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     network number.  This makes the two part number format convenient for
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     specifying Class A network numbers as ``net.host''.
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     When only one part is given, the value is stored directly in the Internet
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     network number without any byte rearrangement.
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     All numbers supplied as ``parts'' in a `.' notation may be decimal,
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     octal, or hexadecimal, as specified in the C language (i.e., a leading 0x
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     or 0X implies hexadecimal; otherwise, a leading 0 implies octal; other-
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     wise, the number is interpreted as decimal).
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SEE ALSO
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     byteorder(3), inet(3), networks(5)
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HISTORY
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     The inet_net_ntop and inet_net_pton functions first appeared in BIND
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     4.9.4.
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BSD                              June 18, 1997                             BSD
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