Path: utzoo!utgpu!news-server.csri.toronto.edu!bonnie.concordia.ca!uunet!mcsun!tuvie!vmars!hp
From: hp@vmars.tuwien.ac.at (Peter Holzer)
Newsgroups: comp.os.minix
Subject: Re: vfprintf problem
Message-ID: <2307@tuvie.UUCP>
Date: 9 Feb 91 19:24:08 GMT
References: <1991Feb5.180022.01726@ptavv.ka.sub.org>
Sender: news@tuvie.UUCP
Lines: 46

ralf@ptavv.ka.sub.org (Ralf Wenk) writes:

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

>FILE *log;
>char line[LINESIZE+1];

>void lprintf ( ctl, argp )
>char *ctl;
>va_list argp;
>{
>  vfprintf( log, ctl, argp );
>}	/* lprintf */

>Down in the source lprintf() is called like this:

>lprintf("batch from %s", line );

>Is is also interesting, that changing the call to vfprintf( log, ctl, &argp )
>will fix it. Do I misunderstand how to use stdarg.h or is this an MINIX ST
>problem ?
>I just use it the way vsprintf() uses it.


You do misunderstand how to use stdarg.h. 
Your function should read:

void lprintf (ctl)
char *ctl;
{
  va_list argp;
  va_start (argp, ctl);
  vfprintf( log, ctl, argp );
  va_end (argp);
}	/* lprintf */


Actually, the function header should be void lprintf (char * ctl, ...),
but as Minix-cc isn't ANSI yet, you can't do this.

--
|    _  | Peter J. Holzer                       | Think of it   |
| |_|_) | Technical University Vienna           | as evolution  |
| | |   | Dept. for Real-Time Systems           | in action!    |
| __/   | hp@vmars.tuwien.ac.at                 |     Tony Rand |