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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 <sys/socket.h>
- #include <netinet/in.h>
- #include <arpa/inet.h>
-
- 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
- </PRE
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