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Summary of Changes
In the C standard library
<ctype.h>, character classification functions likeisspace()require their argument to be representable as anunsigned charor equal toEOF. Passing a signedcharwith a negative value (e.g. non-ASCII or UTF-8 code units\x80through\xFF) causes undefined behavior.Fix
(unsigned char)casts in:ffStrSet(src/common/strutil.h)ffStrbufTrimLeftSpace(src/common/impl/FFstrbuf.c)ffStrbufEndsWithFn(src/common/FFstrbuf.h)tests/strutil.cverifyingffStrSethandles non-ASCII bytes\x80and\xff.Verification & Testing
ctest --test-dir build).