#include "utility.h"

int graphics_ok()
/*============================================================================*/
/* PURPOSE: DETERMINE WHETHER OR NOT GRAPHICS IS AVAILABLE TO THE PROGRAM.
/* OUTPUTS:
/*	FUNCTION VALUE	TRUE IF GRAPHICS IS AVAILABLE, FALSE OTHERWISE.
/* WRITTEN: M.V.GRIESHABER
/* LAST MODIFICATION: 24 SEPTEMBER 1992 MVG
*/
   {
   /* GRAPHICS IS AVAILABLE ONLY IF STDIN IS A TTY *AND* THE USER IS */
   /* RUNNING THE PROGRAM ON THE MAIN (GRAPHICS) CONSOLE. */
   return(isatty(0) && strcmp(getenv("TERM"),"iris-ansi")==0);
   }