Xref: utzoo comp.unix.ultrix:3819 comp.sys.dec:3468
Path: utzoo!attcan!uunet!mailrus!swan!hawk!pmaresch
From: pmaresch@hawk.ulowell.edu (Pierre Mareschal)
Newsgroups: comp.unix.ultrix,comp.sys.dec
Subject: <varargs.h> on the DECstation 3100
Keywords: varargs stdarg decstation
Message-ID: <1026@swan.ulowell.edu>
Date: 27 Jun 90 18:48:19 GMT
Sender: news@swan.ulowell.edu
Reply-To: pmaresch@hawk.ulowell.edu (Pierre Mareschal)
Followup-To: comp.unix.ultrix
Distribution: na
Organization: University of Lowell, CS Dept
Lines: 50


Hi, I encountered some problem on the DECstation 3100 with varargs.
The simple program below doesn't work if I change all the occurence
of double by float. Why?

What is the difference between varargs and stdarg?

Thanks for anwering.

Pierre.

----
#include <varargs.h>

void f(va_alist) va_dcl {
		va_list ap;
        char *p, *sval, *fmt;
        int ival;
        double fval;

        va_start(ap);
        fmt = va_arg(ap, char*);
        for(p = fmt; *p; p++) {
            if(*p != '%')
                putchar(*p);
            else
                switch(*++p) {
                case 'f':
                    fval = va_arg(ap, double);
                    printf("%f",fval);
                    break;
                case 'd':
                    ival = va_arg(ap, int);
                    printf("%d",ival);
                    break;
                case 's':
                    sval = va_arg(ap, char*);
                    printf("%s",sval);
                    break;
                }
        }
        va_end();
}

main() {
		double w = 4.7;
        f("%s : %d %d %d %f\n", "test", 3, 2, 1, w);
}
----
:- pmaresch@hawk.ulowell.edu