%{
#include "wisebase.h"

%}



%{
#include "wiseoverlay.h"

static boolean isinuse=FALSE;
static FILE * overlay = NULL;
static int delete_len=0;


%func
actually starts on overlay system
on the FILE*. Should really by stderr...
nothing else makes sense.
%%
void start_overlay(FILE * over)
{
  overlay=over;
  isinuse=TRUE;
}

%func
finishes an overlay system by putting in a
newline and clearing the static variables
%%
void stop_overlay(void)
{
  fprintf(overlay,"\n");
  delete_len=0;
  overlay=NULL;
  isinuse=FALSE;
}

%func
Does the business. Deletes the previous
message with \b and then prints the current
one ontop. 

don't put in \n's otherwise this is going to 
look yukky ;)
%%
void print_overlay(char * msg, ... )
{
  char buffer[512];
  va_list ap;
  register int i;	
  
  if( isinuse == FALSE)
    /* error message */
    return;
  
  
  va_start(ap,msg);
	
  for(i=0;i<delete_len;i++)
    fputc('\b',overlay);
  
  vsprintf(buffer,msg,ap);
  
  delete_len=strlen(buffer);
  
  fprintf(overlay,"%s",buffer);
  fflush(overlay);
  
  va_end(ap);
  
  return;
}

%}