The page mentioned "a codebase originally written for 32-bit". These codebases are probably quite old, old enough to have been written before stdint.h was a thi

The page mentioned "a codebase originally written for 32-bit". These codebases are probably quite old, old enough to have been written before stdint.h was a thing. AFAIK, stdint.h is from 1999, and at least one very popular operating system didn't have it until this decade; of the codebases mentioned, according to Wikipedia for instance both PHP and zlib are from 1995. Nowadays, I agree: you should use stdint.h (or cstdint for C++) for everything, plus size_t (from stddef.h/cstddef) for array/buffer sizes.