I’m looking at:
https://git.openwrt.org/?p=project/firewall3.git;a=commitdiff;h=c03e20d7f594058ff223f30cf34de1b5e8210b8d;hp=b59934331c4b9271ceb5e30b793a552618299d39
and wondering, why not just do:
v4->s_addr = htonl(~(UINT_MAX >> bits));
For instance, with bits == 14, we get:
UINT_MAX >> 14 == 0x0003ffff
~0x0003ffff == 0xfffc0000
Checking the case for bits == 0, we get:
UINT_MAX >> 0 == 0xffffffff
~0xffffffff == 0x00000000
And for bits == 32, we get:
UINT_MAX >> 32 == 0x00000000
~0x00000000 == 0xffffffff
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