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with two exceptions:
o Any non-zero field width is automatically replaced by standard
IP address width. This hides dependences on IPv4/IPv6.
o %#I generates hexadecimal form of the address.
Therefore |%I| generates unpadded format, |%1I| full size flush-right,
and |%-1I| full size flush-left format.
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error code as an argument.
Use it in socket hooks where we really shouldn't rely on errno containing
the right value or even existing.
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and other non-portable functions on all systems.
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but the modifications were relatively simple and straightforward.
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format strings:
%I IP address
%#I IP address in hexadecimal
%1I IP address padded to full length
%m strerror(errno)
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