Re: Is this doable in MS C?

From:

"Igor Tandetnik" <itandetnik@mvps.org>

Newsgroups:

microsoft.public.vc.language

Date:

Thu, 11 Dec 2008 00:02:47 -0500

Message-ID:

<ONiM620WJHA.4560@TK2MSFTNGP02.phx.gbl>

"Tommy" <bad@reallybad.com> wrote in message
news:OmsCmrzWJHA.4560@TK2MSFTNGP02.phx.gbl

Igor Tandetnik wrote:

Tommy <bad@reallybad.com> wrote:

But if you go direct, you can solve it very easily:

void foo(int argc, ...)
{
    va_list argptr;
    va_start(argptr, argc);
    const char *p = NULL;
    while (argc && (p = va_arg(argptr,const char *))) {
       vprintf_s( p, argptr );
       while (argc--) va_arg(argptr, void *); // SEE NOTE1
       argc = va_arg(argptr, int);
    }
    va_end(argptr);
}

#define MY_MACRO foo

MY_MACRO(
     2, "%d %f\n", 1, 2.0,
     2, "%s %s\n", "hello", "world",
     NULL);

Have you actually tested this code? Does it work for you? It crashes
for me after printing the first line.

Stay away from arguments (i.e. double) that take more than 32 bits,
and it will work.

Should I also stay away from 64-bit compiler, where int and char* have
different size?
--
With best wishes,
Igor Tandetnik

With sufficient thrust, pigs fly just fine. However, this is not
necessarily a good idea. It is hard to be sure where they are going to
land, and it could be dangerous sitting under them as they fly
overhead. -- RFC 1925