#include "xlib.h"

static s48_value V_X_Error_Handler, V_X_Fatal_Error_Handler;

/* Default error handlers of the Xlib */
extern int _XDefaultIOError();   
extern int _XDefaultError();

static X_Fatal_Error (d) Display *d; {
    s48_value args, fun;
    S48_DECLARE_GC_PROTECT(1);

    Reset_IO (0);
    args = Make_Display (0, d);
    S48_GC_PROTECT_1 (args);
    args = s48_cons (args, S48_NULL);
    S48_GC_UNPROTECT;
    fun = Var_Get (V_X_Fatal_Error_Handler);
    if (TYPE(fun) == T_Compound)
	(void)Funcall (fun, args, 0);
    _XDefaultIOError (d);
    exit (1);         /* In case the default handler doesn't exit() */
    /*NOTREACHED*/
}

static X_Error (d, ep) Display *d; XErrorEvent *ep; {
    s48_value args, a, fun;
    S48_DECLARE_GC_PROTECT(1);

    Reset_IO (0);
    args = s48_enter_integer ((unsigned long)ep->resourceid);
    S48_GC_PROTECT_1 (args);
    args = s48_cons (args, S48_NULL);
    a = s48_enter_integer (ep->minor_code);
    args = s48_cons (a, args);
    a = s48_enter_integer (ep->request_code);
    args = s48_cons (a, args);
    a = Bits_To_Symbols ((unsigned long)ep->error_code, 0, Error_Syms);
    if (S48_NULL_P (a))
	a = s48_enter_integer (ep->error_code);
    args = s48_cons (a, args);
    a = s48_enter_integer (ep->serial);
    args = s48_cons (a, args);
    a = Make_Display (0, ep->display);
    args = s48_cons (a, args);
    S48_GC_UNPROTECT;
    fun = Var_Get (V_X_Error_Handler);
    if (TYPE(fun) == T_Compound)
	(void)Funcall (fun, args, 0);
    else
	_XDefaultError (d, ep);
}

static X_After_Function (d) Display *d; {
    s48_value args;
    S48_DECLARE_GC_PROTECT(1);

    args = Make_Display (0, d);
    S48_GC_PROTECT_1 (args);
    args = s48_cons (args, S48_NULL);
    S48_GC_UNPROTECT;
    (void)Funcall (DISPLAY(S48_CAR (args))->after, args, 0);
}

static s48_value P_Set_After_Function (d, f) s48_value d, f; {
    s48_value old;

    Check_Type (d, T_Display);
    if (S48_EQ_P(f, S48_FALSE)) {
	(void)XSetAfterFunction (DISPLAY(d)->dpy, (int (*)())0);
    } else {
	Check_Procedure (f);
	(void)XSetAfterFunction (DISPLAY(d)->dpy, X_After_Function);
    }
    old = DISPLAY(d)->after;
    DISPLAY(d)->after = f;
    return old;
}

static s48_value P_After_Function (d) s48_value d; {
    Check_Type (d, T_Display);
    return DISPLAY(d)->after;
}
    
elk_init_xlib_error () {
    Define_Variable (&V_X_Fatal_Error_Handler, "x-fatal-error-handler", S48_NULL);
    Define_Variable (&V_X_Error_Handler, "x-error-handler", S48_NULL);
    (void)XSetIOErrorHandler (X_Fatal_Error);
    (void)XSetErrorHandler (X_Error);
    Define_Primitive (P_Set_After_Function, "set-after-function!", 2, 2, EVAL);
    Define_Primitive (P_After_Function,     "after-function",      1, 1, EVAL);
}