Some functions in the ANSI C Library are not fully operational on the Macintosh environment because they are meant to be used in a character-based user interface instead of the Macintosh computer's graphical user interface. While these functions are available, they may not work as you expect them to. Such inconsistencies between the ANSI C Standard and the Metrowerks implementation are noted in a function's description.

Except where noted, ANSI C Library functions use C character strings, not Pascal character strings.