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inet_ntop: do not compress single zeros in IPv6

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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.
This commit is contained in:
Arthur Jones 2018-06-05 16:51:27 -07:00 committed by Rich Felker
parent da5851e9f4
commit 5c8e69267b
1 changed files with 1 additions and 1 deletions
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2
src/network/inet_ntop.c
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@ -36,7 +36,7 @@ const char *inet_ntop(int af, const void *restrict a0, char *restrict s, socklen
j = strspn(buf+i, ":0");
if (j>max) best=i, max=j;
}
if (max>2) {
if (max>3) {
buf[best] = buf[best+1] = ':';
memmove(buf+best+2, buf+best+max, i-best-max+1);
}