Xref: utzoo comp.sources.games.bugs:901 comp.lang.c:19885
Path: utzoo!attcan!utgpu!jarvis.csri.toronto.edu!rutgers!cs.utexas.edu!uunet!mcvax!ukc!dcl-cs!gdt!ccsmm
From: ccsmm@gdt.bath.ac.uk (Martin Maclaren)
Newsgroups: comp.sources.games.bugs,comp.lang.c
Subject: Re: vsprintf undefined
Keywords: vsprintf varargs
Message-ID: <1989Jul12.190205.17600@gdt.bath.ac.uk>
Date: 12 Jul 89 19:02:05 GMT
References: <3171@puff.UUCP>
Organization: University of Bath, England
Lines: 56

kschnitz@puff.UUCP (Soccer Stud) writes:


>Help!  This function came with the tetris game I got for Unix based
>machines.  The problem is vsprintf is undefined using my C libraries.

>Does anyone have a simple solution?  Please post the answer because
>others have had the same problem.  Thanks in advance.

> ...

>/*VARARGS*/
>char *form (va_alist)
>  va_dcl
>{
>  va_list pvar;
>  char *fmt_string;
>  static char result[LINELEN];
>  
>  va_start (pvar);
>  fmt_string = va_arg (pvar, char*);
>  (void) vsprintf (result, fmt_string, pvar);
>  va_end (pvar);
>  return (result);
>}

How about the following....

/*VARARGS*/
char *form (va_alist)
  va_dcl
{
  va_list pvar;
  char *fmt_string;
  static char result[LINELEN];
  FILE b;
  
  va_start (pvar);
  fmt_string = va_arg (pvar, char*);

 /*  (void) vsprintf (result, fmt_string, pvar);  */

  b._flag = _IOWRT|_IOSTRG;
  b._ptr = result;
  b._cnt = LINELEN;
  _doprnt(fmt_string, pvar, &b);
  putc('\0', &b);

  va_end (pvar);
  return (result);
}


Works fine for me.

Martin.