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by teddyh
1373 days ago
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$ man 3 inet_aton
[…]
inet_aton() converts the Internet host address cp from the IPv4
numbers-and-dots notation into binary form (in network byte order)
and stores it in the structure that inp points to. inet_aton()
returns nonzero if the address is valid, zero if not. The address
supplied in cp can have one of the following forms:
a.b.c.d Each of the four numeric parts specifies a byte of the
address; the bytes are assigned in left-to-right order
to produce the binary address.
a.b.c Parts a and b specify the first two bytes of the binary
address. Part c is interpreted as a 16-bit value that
defines the rightmost two bytes of the binary address.
This notation is suitable for specifying (outmoded)
Class B network addresses.
a.b Part a specifies the first byte of the binary address.
Part b is interpreted as a 24-bit value that defines the
rightmost three bytes of the binary address. This
notation is suitable for specifying (outmoded) Class A
network addresses.
a The value a is interpreted as a 32-bit value that is
stored directly into the binary address without any byte
rearrangement.
In all of the above forms, components of the dotted address can be
specified in decimal, octal (with a leading 0), or hexadecimal,
with a leading 0X). Addresses in any of these forms are
collectively termed IPV4 numbers-and-dots notation. The form that
uses exactly four decimal numbers is referred to as IPv4 dotted-
decimal notation (or sometimes: IPv4 dotted-quad notation).
— https://manpages.debian.org/stable/manpages-dev/inet_aton.3.... |
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