[manual]: rawmemchr(3) and UB

[Wilco Dijkstra]

Hi Alex,

> It seems I misunderstood your email.  I've seen that glibc implements 
> rawmemchr(3) in terms of strlen(3) and memchr(3).  So it seems better to just 
> not implement this function in my library, and optimize strlen(3) directly.  The 
> non-'\0' case seems useless, so probably not worth this function unless I see a 
> use for it.

The idea is that compilers should treat it like mempcpy, bcopy etc and replace
all uses with standard strlen/memchr. GCC/LLVM don't do this yet for rawmemchr.

Since it is not in any standard and there is no benefit of having it, we should
obsolete this function along with all the other GNU extensions.

Cheers,
Wilco