He really should have noted the misdefinition of the truncating versions in string.h. Eg. strncpy doesn't leave enough room for the final \0, so the string may be the unterminated. A serious POSIX error.
This worse than the wchar_t iswalpha trouble with older UCS-2 implementations (Windows, AIX).
Or the implementation trouble with memset, which either can be optimized away without a compiler barrier, or on modern hyperthreaded microarchitectures which violate load-store ordering and thus need a full memory barrier (mfence). no single libc does it properly, not even crypto libs, such as libsodium.
This worse than the wchar_t iswalpha trouble with older UCS-2 implementations (Windows, AIX).
Or the implementation trouble with memset, which either can be optimized away without a compiler barrier, or on modern hyperthreaded microarchitectures which violate load-store ordering and thus need a full memory barrier (mfence). no single libc does it properly, not even crypto libs, such as libsodium.