Making Code 64-bit Clean

using lint,

compiling in ANSI C or aC++, and

using the portable header file <inttypes.h>.

Use the same source code and header files for both 32-bit and 64-bit programs.

Use appropriate data types consistently and strictly.

For example, use off_t consistently for file offsets and fpos_t for file positions.

Use integral types in <inttypes.h>, where applicable, instead of int and long

Use fixed/scalable width integral types, algorithms, and masks as appropriate.

Fixed types remain a consistent size on 32-bit and 64-bit platforms. For example, use int32_t, defined in <inttypes.h>, if ints and longs should be 32 bits in your application. Scalable types can grow and scale without modification to future architectures.

Perform boundary checking on integral type ranges.

Update 64-bit code in cases where 32-bit and 64-bit processes share the same memory segment.