HelenOS sources

NULL_DISPLAY      331 uspace/app/calculator/calculator.c 	str = (expr != NULL) ? expr : NULL_DISPLAY;
NULL_DISPLAY      588 uspace/app/calculator/calculator.c 		(void) ui_entry_set_text(display, (void *) NULL_DISPLAY);
NULL_DISPLAY      944 uspace/app/calculator/calculator.c 	rc = ui_entry_create(window, NULL_DISPLAY, &display);