Xref: utzoo comp.lang.modula2:761 comp.lang.misc:1417 comp.lang.c:9158 comp.lang.pascal:792
Path: utzoo!mnetor!uunet!lll-winken!lll-tis!ames!amdahl!nsc!taux01!avi
From: avi@taux01.UUCP (Avi Bloch)
Newsgroups: comp.lang.modula2,comp.lang.misc,comp.lang.c,comp.lang.pascal
Subject: Re: Modula2's godawful IO.
Message-ID: <560@taux01.UUCP>
Date: 11 Apr 88 12:15:20 GMT
References: <764@ndsuvax.UUCP> <535@m10ux.UUCP>
Reply-To: avi@taux01.UUCP (Avi Bloch)
Organization: National Semiconductor (Israel) Ltd.
Lines: 37
Keywords: printf
Summary: Using printf in Modula-2

>
>I hate C as much as the next guy, but it seems to me that printf is
>the solution.  Has anyone ever written some kind of front end for a 
>modula compiler to turn printf's into WriteSh*t's?

Another, more general solution, is the one we took when developing National's
Modula-2 compiler. We wanted to be able to interface with any C routine, even
those that weren't as strict as Modua-2 routines (e.g. num. & type of parameters
procedure or function, etc.). The following is an excerpt from the manual on the
extension we added for this purpose:

PSEUDO-MODULE 'C'
-----------------

A pseudo-module 'C' has been implemented which, like the pseudo-module SYSTEM
does not actually exist but is built into the compiler. Module C is used to
import C routines that cannot be defined using a Modula-2 definition, e.g.
routines that have a variable number of parameters (see following example).
Objects imported from module C have the following properties:

    - The object must be a procedure.
    - No type-checking is done on parameters to such procedures.
    - The procedures can receive any number of pararmeters.
    - The procedures can be called using either a procedure call or a function
      call.
    - Values returned by such procedures are of type WORD.

Example:

    Give the IMPORT statement:

	FROM C IMPORT printf;
    
    all of the following statements are legal:

	printf;
	printf(string, integer, longreal);
	cardinal = printf(string, integer, longreal);