Fix llvm-strings crash for negative char values
On Windows at least, llvm-strings was crashing if it encountered bytes
that mapped to negative chars, as it was passing these into
std::isgraph and std::isblank functions, resulting in undefined
behaviour. On debug builds using MSVC, these functions verfiy that the
value passed in is representable as an unsigned char. Since the char is
promoted to an int, a value greater than 127 would turn into a negative
integer value, and fail the check. Using the llvm::isPrint function is
sufficient to solve the issue.
Reviewed by: ruiu, mstorsjo
Differential Revision: https://reviews.llvm.org/D53509
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@345137 91177308-0d34-0410-b5e6-96231b3b80d8
2 files changed