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Per RFC 5952, ties for longest sequence of zero fields must be broken
by choosing the earliest, but the implementation put the leading
sequence of zeros at a disadvantage. That's because for example when
compressing "0:0:0:10:0:0:0:10" the strspn(buf+i, ":0") call returns 6
for the first sequence and 7 for the second one – the second sequence
has the benefit of a leading colon.
Changing the condition to require beating the leading sequence by not
one but two characters resolves the issue.
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maintainer's note: this change is for conformance with RFC 5952,
4.2.2, which explicitly forbids use of :: to shorten a single 16-bit 0
field when producing the canonical text representation for an IPv6
address. fixes a test failure reported by Philip Homburg, who also
submitted a patch, but this fix is simpler and should produce smaller
code.
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source and dest arguments for strcpy cannot overlap, so memmove must
be used here. the length is already known from the above loop.
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based on a patch by orc. POSIX actually fails to specify the format of
the ntop conversion; presumably, any output that will correctly
round-trip back via the (well-specified) pton operation is acceptable.
the new behavior is much more convenient than the old, however.
this patch also affects getnameinfo, which is implemented in terms of
inet_ntop and which is the preferred interface for performing this
conversion.
I've also removed some inexplicable cruft (filling the buffer with 'x'
before doing anything) whose origin I was unable to track down.
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to deal with the fact that the public headers may be used with pre-c99
compilers, __restrict is used in place of restrict, and defined
appropriately for any supported compiler. we also avoid the form
[restrict] since older versions of gcc rejected it due to a bug in the
original c99 standard, and instead use the form *restrict.
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