Initialize output vectors in vex_* functions to 0

Some calls (especially vex_wheelv) may not be supported

Author: th-otto

n_vq_margins.c

@@ -50,7 +50,9 @@ vq_margins (short handle, short *top_margin, short *bottom_margin,
 	 * NVDI 5.x printer drivers have a bug, and write some output parameters
 	 * directly to the VDIPB instead of the intout array.
 	 * Because of another bug in the same routine,
-	 * it also does not return the value of vdpi
+	 * it also does not return the value of vdpi.
+	 * Because of another bug in the same routine,
+	 * top and bottom margins are swapped
 	 */
 	if (vdi_params.control != vdi_control)
 	{
@@ -68,6 +70,8 @@ vq_margins (short handle, short *top_margin, short *bottom_margin,
 		/* vdpi is not accessible; pb[3] will contain the y-resolution */
 		/* assume vdpi == hdpi */
 		*vdpi = pb[2];
+		*bottom_margin = vdi_intout[1];
+		*top_margin = vdi_intout[2];
 	}
 
 	return vdi_intout[0];

vex_butv.c

@@ -22,6 +22,7 @@ vex_butv (short handle, void *newhdlr, void **old)
 	VDI_PARAMS(vdi_control, 0L, 0L, vdi_dummy, vdi_dummy );
 
 	vdi_control_ptr(0, void *) = newhdlr;
+	vdi_control_ptr(1, void *) = 0;
 
 	VDI_TRAP_00 (vdi_params, handle, 125);
 

vex_curv.c

@@ -28,6 +28,7 @@ vex_curv (short handle, void *new, void **old)
 	VDI_PARAMS(vdi_control, 0L, 0L, vdi_dummy, vdi_dummy);
 
 	vdi_control_ptr(0, void *) = new;
+	vdi_control_ptr(1, void *) = 0;
 
 	VDI_TRAP_00 (vdi_params, handle, 127);
 

vex_motv.c

@@ -24,6 +24,7 @@ vex_motv (short handle, void *new, void **old)
 	VDI_PARAMS(vdi_control, 0L, 0L, vdi_dummy, vdi_dummy );
 
 	vdi_control_ptr(0, void *) = new;
+	vdi_control_ptr(1, void *) = 0;
 
 	VDI_TRAP_00 (vdi_params, handle, 126);
 

vex_timv.c

@@ -25,6 +25,7 @@ vex_timv (short handle, void *time_addr, void **otime_addr, short *time_conv)
 	VDI_PARAMS(vdi_control, 0L, 0L, vdi_intout, vdi_dummy );
 
 	vdi_control_ptr(0, void *) = time_addr;
+	vdi_control_ptr(1, void *) = 0;
 
 	VDI_TRAP_00 (vdi_params, handle, 118);
 

vex_wheelv.c

@@ -25,6 +25,7 @@ vex_wheelv (short handle, void *new, void **old)
 	VDI_PARAMS(vdi_control, 0L, 0L, vdi_dummy, vdi_dummy );
 
 	vdi_control_ptr(0, void *) = new;
+	vdi_control_ptr(1, void *) = 0;
 
 	VDI_TRAP_00 (vdi_params, handle, 134);