The Windows Sockets inet_addr
function converts a string containing an Internet Protocol dotted address
into an in_addr
unsigned long inet_addr (
[in] A null-terminated character string representing a number expressed in the
Internet standard ".'' notation.
This function interprets the character string specified by the cp
parameter. This string represents a numeric Internet address expressed in the
Internet standard ".'' notation. The value returned is a number suitable for
use as an Internet address. All Internet addresses are returned in IP's network
order (bytes ordered from left to right).
Values specified using the ".'' notation take one of the following forms:
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 address. Note that
when an Internet address is viewed as a 32-bit integer quantity on the Intel
architecture, the bytes referred to above appear as "d.c.b.a''. That is, the bytes
on an Intel processor are ordered from right to left.
The following notations are only used by Berkeley, and nowhere else on the
Internet. In the interests of compatibility with their software, they are
supported as specified.
When a three part address is specified, the last part is interpreted as a
16-bit quantity and placed in the right most two bytes of the network address. This
makes the three part address format convenient for specifying Class B network
addresses as "128.net.host''.
When a two part address is specified, the last part is interpreted as a 24-bit
quantity and placed in the right most three bytes of the network address. This
makes the two part address format convenient for specifying Class A network
addresses as "net.host''.
When only one part is given, the value is stored directly in the network
address without any byte rearrangement.
If no error occurs, inet_addr
returns an unsigned long containing a suitable binary representation of the
Internet address given. If the passed-in string does not contain a legitimate
Internet address, for example if a portion of an "a.b.c.d" address exceeds 255, inet_addr
returns the value INADDR_NONE.
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