Path: utzoo!utgpu!jarvis.csri.toronto.edu!rutgers!apple!bloom-beacon!husc6!ogccse!littlei!guardian!alfred
From: alfred@guardian.UUCP (alfred)
Newsgroups: comp.sys.intel
Subject: Re: PLM vs. C for 80286/80386
Keywords: PLM C
Message-ID: <230@guardian.UUCP>
Date: 14 Jun 89 18:50:36 GMT
References: <598@philtis.UUCP> <126@tridom.uucp> <409@nbires.nbi.com>
Reply-To: alfred@.UUCP (Alfred Huang)
Organization: Intel Corp., Development Tools Operation
Lines: 25

> It's been a while since I've used PL/M, so I may not have the syntax
> quite right, but you can implement variable arguments by passing pointers:
> 
> call Printf ("format string", @(arg1, arg2, etc));

For your information, you no longer need to do that with PL/M-n86 V3.3,
under this version, you can call any C-interfaced function with variable
parameters (similar to ANSI-C function prototype with ellipses):

    $interface (C=printf)
    foo: do;
            printf: procedure (p) external;
                    declare p pointer;
            end;
 
            proc: procedure (a,b) public;
                  declare (a,b) word;
                  call printf(@('A = %d, B = %d'), a, b); /* LEGAL NOW */
            end;
    end;

 In this case, type checking will be carried out for the first
 argument only, extra arguments in the actual call will not be checked.
 The extreme case will be declaring a C external function with no
 argument, then you can call that function with any number of parameter.