|Technote PT 05||November 1987|
This is a common misconception people have when they look through the MPW C include files. People report that the declaration of a ROM or system call foo() has been mistakenly left out of this or that include file. Here's the low-down on when functions do not have to be declared in an include file.
A C function does not need to be declared in an include file if it requires glue code and returns a short or long integer as a result.
Routines that require glue code include:
* All routines that are marked [Not in ROM] in Inside Macintosh
* All register based routines (Operating System routines)
* All routines which have strings or points as arguments (and have mixed case