Daniel Micay fed2659869 add fortified implementations of fread/fwrite
A __size_mul_overflow utility is used to take advantage of the checked
overflow intrinsics in Clang and GCC (>= 5). The fallback for older
compilers is the optimized but less than ideal overflow checking pattern
used in OpenBSD.

Change-Id: Ibb0d4fd9b5acb67983e6a9f46844c2fd444f7e69
2015-07-23 18:55:46 -04:00
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