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Overview -- Interfacing with Assembly Language


   In addition to supporting a mixed language interface to C and other
   high-level languages, Clipper also supports user-defined functions
   written in assembler through the Extend System.  Like the interface
   to C, the Extend System provides access to the parameter passing and
   returning functions.  These are the same functions available from C
   differing only by the method of access.  Here you must manipulate the
   stack so the proper values are known when Clipper is called.  To make
   this process easier and more rational, two sets of macros are
   included (EXTENDA.MAC and EXTENDA.INC).

   EXTENDA.MAC is similar to earlier versions of Clipper and is provided
   in Summer '87 as a means of retaining compatibility with assembler
   code written for Autumn '86.  EXTENDA.INC is a new set of macros
   developed for use with Summer '87 and Microsoft MASM version 5.0.