5 ms·
I don’t actually think it’s in a spec formally but is in a common c lib[0]. > a.b > Part a specifies the first byte of the binary address. Part b is interpret
by nerdwaller 9y ago
I don’t actually think it’s in a spec formally but is in a common c lib[0].
> 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 C network addresses.
[0]: https://linux.die.net/man/3/inet_aton https://linux.die.net/man/3/inet_aton
- sigjuice 9y agoThanks. I just came across the man page myself while I was writing this tiny program. $ cat 127.1.c #include <stdio.h> #include <arpa/inet.h> int main(int argc, char *argv[]) { struct in_addr addr; if (inet_aton(argv[1], &addr)) printf("%08x\n", addr.s_addr); return 0; } $ make 127.1 CFLAGS=-Wall cc -Wall 127.1.c -o 127.1 $ ./127.1 1.1 01000001 $ ./127.1 127.1 0100007f
- tzs 9y agoThe POSIX spec (IEEE 1003.1) says the same thing for inet_addr(), so it does occur in an actual spec.