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From: jbayer@ispi.UUCP (Jonathan Bayer)
Newsgroups: comp.unix.xenix
Subject: Bug in Xenix stdarg.h
Keywords: stdarg
Message-ID: <1184@ispi.UUCP>
Date: 9 Oct 89 16:54:32 GMT
Organization: Intelligent Software Products, Inc.
Lines: 32


Greetings,

This problem is on an SCO Xenix 2.3.2 system running the 2.3 development
system.  While developing a program I had occasion to use <stdarg.h> in
a program.  I kept getting errors, and finally traced them down to
<stdarg.h>.  It turns out that there is an error in the defination:

Original <stdarg.h> :

	#define	va_dcl			int va_alist;
	#define	va_start(list, parmN)	list = (char *) &va_alist

Corrected <stdarg.h> :

	#define	va_start(list, parmN)	list = (char *) &parmN + sizeof(parmN)

According to the ansi defination, va_alist is not there.  It appears
that someone ported the <varargs.h>, and either didn't test it or didn't
understand the defination.


I made these conclusions based on the manual for the Microsoft C 5.1
compiler, which gives a nice description of the differences between
<stdarg.h> and <varargs.h>.


JB
-- 
Jonathan Bayer		Intelligent Software Products, Inc.
(201) 245-5922		500 Oakwood Ave.
jbayer@ispi.COM		Roselle Park, NJ   07204