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PROTO

Prototypes a function or procedure. You can call the function prototyped by the PROTO directive by using the INVOKE directive.

Syntax

label PROTOdistance⟧ ⟦language-type⟧ ⟦,parameter:tag ...⟧

Parameters

label
The name of the prototyped function.

distance (32-bit MASM only.)
(Optional) Used in 16-bit memory models to override the default and indicate NEAR or FAR calls.

language-type (32-bit MASM only.)
(Optional) Sets the calling and naming convention for procedures and public symbols. Supported conventions are:

  • 32-bit FLAT model: C, STDCALL

  • 16-bit models: C, BASIC, FORTRAN, PASCAL, SYSCALL, STDCALL

parameter
The optional name for a function parameter.

tag
The type of a function parameter.

The parameter and tag parameters may appear multiple times, once for each passed argument.

Example

This sample shows a PROTO declaration for a function named addup3 that uses a NEAR call to override the 16-bit model default for procedure calls, and uses the C calling convention for stack parameters and return values. It takes two arguments, a WORD and a VARARG.

addup3 PROTO NEAR C, argcount:WORD, arg1:VARARG

See also

Directives Reference
.MODEL Reference
MASM BNF Grammar