find_by_class: Use new utf8_to_uv; not utf8_to_uvchr_buf #22832
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find_by_class() is used in pattern matching. This is a subtle bug fix when the input is malformed UTF-8. We say we don't support malformed, but this commit is a step towards better protecting against that eventuality. frior to this commit, some patterns that use find_by_class() would exhibit different matching behavior of malformed input depending on if utf8 warnings were enabled or not. This is because utf8_to_uvchr_buf() returns NUL if utf8 warnings are on; and the REPLACEMENT CHARACTER if they are off. If the match criteria accepts one but not the other, the behavior would differ. Now, malformed input never matches a class
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find_by_class() is used in pattern matching.
This is a subtle bug fix when the input is malformed UTF-8. We say we don't support malformed, but this commit is a step towards better protecting against that eventuality.
frior to this commit, some patterns that use find_by_class() would exhibit different matching behavior of malformed input depending on if utf8 warnings were enabled or not.
This is because utf8_to_uvchr_buf() returns NUL if utf8 warnings are on; and the REPLACEMENT CHARACTER if they are off. If the match criteria accepts one but not the other, the behavior would differ.
Now, malformed input never matches a class