[issue41170] Use strnlen instead of strlen when the size i known.

[Larry Hastings]

Larry Hastings <larry at hastings.org> added the comment:

strnlen() isn't standard C, but an exciting new function strnlen_s() is, as of C11.

https://en.cppreference.com/w/c/string/byte/strlen

(At this rate, we should be able to code CPython using that standard in about 2030.)

But!  I found a 2005 thread on /. talking about strnlen in MSVC.  So maybe it's there.  Though Microsoft has this funny habit of putting an underscore in front of C library functions that aren't standard, so maybe it's _strnlen().

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nosy: +larry

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