Xref: utzoo comp.unix.xenix.misc:176 comp.unix.xenix.sco:2328
Newsgroups: comp.unix.xenix.misc,comp.unix.xenix.sco
Path: utzoo!utgpu!news-server.csri.toronto.edu!rpi!batcomputer!cornell!uw-beaver!mit-eddie!eddie!aryeh
From: aryeh@eddie.mit.edu (Aryeh M. Weiss)
Subject: Re: problem with varargs.h in Xenix 2.3.3
Message-ID: <1991Apr25.133920.15363@eddie.mit.edu>
Summary: varargs.h for K&R , stdarg.h for ANSI
Keywords: xenix varargs 2.3.3 compiler c
Sender: news@eddie.mit.edu (Usenet News)
Organization: MIT EE/CS Computer Facilities, Cambridge, MA
References: <6596@cactus.org>
Distribution: usa
Date: Thu, 25 Apr 91 13:39:20 GMT
Lines: 61

In article <6596@cactus.org> statham@cactus.org (Perry L. Statham) writes:
>
>/*
>Can anyone tell me why this program does not compile and how to fix it.
>        
>Compiler Message:
>    testprog.c(19) : error 65: 'va_alist' : undefined
>
...
>void sceprintf( format, ... )
>char *format;
>{
>  FILE *log;
>  va_list argptr;
>
>  if ((log = fopen("logfile","a+")) != NULL) {
>    va_start(argptr);
>    vfprintf(log,format,argptr);
>    va_end(argptr);
>    fclose(log);
>  }
>} 

There are two implementations of ``varargs'' in Xenix.
The header <varargs.h> is for K&R coding styles while <stdarg.h>
is for ANSI coding style.  The va_start is defined differently in
the two styles.  Since you are using an almost ANSI
coding style you could try the following:

#include <stdarg.h>
void sceprintf(char *format, ... )
{
  FILE *log;
  va_list argptr;

  if ((log = fopen("logfile","a+")) != NULL) {
    va_start(argptr,format);		/* Makes argptr point to 1st argument
					AFTER format */
    vfprintf(log,format,argptr);
    va_end(argptr);
    fclose(log);
  }
} 


For K&R coding style use:

#include <varargs.h>
void sceprintf(format, va_alist)
char *format; va_dcl			/* NO semicolon! */
{
  FILE *log;
  va_list argptr;

  if ((log = fopen("logfile","a+")) != NULL) {
    va_start(argptr);		/* Makes argptr point to va_alist */
    vfprintf(log,format,argptr);
    va_end(argptr);
    fclose(log);
  }
}