I'm working on merging Timo's patch for ns_parse:

http://git.alpinelinux.org/cgit/aports/tree/main/musl/1001-add-basic-dns-record-parsing-functions.patch?id=81d50064c335467fdfd80368bac6707d70db1af7

The first issue that came up in the process is that arpa/nameser.h,
which was previously not used by musl itself and really should never
have been accepted in its current form, is full of junk like
statement-expressions. Including it in a file that will be compiled
with musl adds build dependency on these nonstandard features. I
cleaned that up with no problem (just un-inlining the macros since
we're adding function versions anyway), but there are a few more
issues.

The main issue is that the parser functions have pointer arithmetic
overflows (UB) checking against the end-of-message pointer. I've tried
to fix that and I'm attaching a patch for review, along with my
version of the fixed file. I'd appreciate comments on whether I missed
anything.

Other changes were mostly cosmetic or at least mechanical.

Rich