lib/libc/tests/string: add test for strnlen()

Tests for strnlen, checks alignments from up to 16 and buffer sizes up
to 64, also checks that passing SIZE_MAX as maxlen works, because it can
cause a

lib/libc/tests/string: add test for strnlen()

Tests for strnlen, checks alignments from up to 16 and buffer sizes up
to 64, also checks that passing SIZE_MAX as maxlen works, because it can
cause a wraparound error if strnlen is incorrect.

Reviewed by: fuz, emaste (GSoC mentors), kib
Sponsored by: Google LLC (GSoC 2024)
Differential Revision: https://reviews.freebsd.org/D46275

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lib/libc/tests/string: improve memccpy "bounds" unit test

The purpose of the "bounds" test is to check that the function does not
overread the array bounds. The old unit test, copied from the strlc

lib/libc/tests/string: improve memccpy "bounds" unit test

The purpose of the "bounds" test is to check that the function does not
overread the array bounds. The old unit test, copied from the strlcpy()
one, always ensured that we see the character c memccpy() is looking for
in the source array before the array ends. While this is correct for
strlcpy(), memccpy()'s specification does not guarantee that c is
present within the given size limit.

The updated test handles this case better, ensuring that the source
array ends early if c is not supposed to be present.

Reported by: getz
Approved by: emaste
See also: D46052
Event: GSoC 2024
Differential Revision: https://reviews.freebsd.org/D46051

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