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Date: Sun, 20 Nov 2011 13:33:40 -0500
From: pete <pfiland@mindspring.com>
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Subject: Re: Variable argument function as a parameter of a variable argument function
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AikidoGuy wrote:
> 
> Hi everyone,
> 
> I've done a little searching, but I can't quite find an answer to my
> question. Everything I've found is more related to how to construct a
> variable argument function, and that's not my question.
> 
> Suppose I have a variable argument function. Is it possible to use it
> to initialize a parameter of another variable argument function?
> 
> For example, printf("%s", varArgFcnReturningAString(a,b,c));
> 
> I ask because I'm not sure if this is supported by the standard and/or
> could be compiler specific.
> 
> Thank you for any help, tips, and suggestions!

/* BEGIN output from new.c */

Yes, it is possible.

/* END output from new.c */




/* BEGIN new.c */

#include <stdio.h>
#include <stdarg.h>

char *varArgFcnReturningAString(char *s, const char *format, ...)
{
    va_list arg;
    
    va_start(arg, format);
    vsprintf(s, format, arg);
    va_end(arg);
    return s;
}

int 
main(void)
{
    char *b = "%s";
    char c[] = "Yes, it is possible.";
    char a[sizeof c] = {0};

    puts("\n/* BEGIN output from new.c */\n");

    printf("%s", varArgFcnReturningAString(a, b, c));
    
    puts("\n\n/* END output from new.c */");
    return 0;
}



-- 
pete