ioctl/intervals: add v4l2_frmivalenum accessor
Add an accessor for v4l2_frmivalenum anonymous
union members, avoiding having to write the union
name and safely returning the appropiate member of
the union that is used.
Signed-off-by: Albert Esteve <aesteve@redhat.com>
diff --git a/lib/src/ioctl/frameintervals.rs b/lib/src/ioctl/frameintervals.rs
index f0be121..4bb7399 100644
--- a/lib/src/ioctl/frameintervals.rs
+++ b/lib/src/ioctl/frameintervals.rs
@@ -13,6 +13,40 @@
}
}
+/// A wrapper for the 'v4l2_frmivalenum' union member types
+#[derive(Debug)]
+pub enum FrmIvalTypes<'a> {
+ Discrete(&'a bindings::v4l2_fract),
+ StepWise(&'a bindings::v4l2_frmival_stepwise),
+}
+
+impl bindings::v4l2_frmivalenum {
+ /// Safely access the intervals member of the struct based on the
+ /// returned index.
+ pub fn intervals(&self) -> Option<FrmIvalTypes> {
+ match self.index {
+ // SAFETY: the member of the union that gets used by the driver
+ // is determined by the index
+ bindings::v4l2_frmivaltypes_V4L2_FRMIVAL_TYPE_DISCRETE => {
+ Some(FrmIvalTypes::Discrete(unsafe {
+ &self.__bindgen_anon_1.discrete
+ }))
+ }
+
+ // SAFETY: the member of the union that gets used by the driver
+ // is determined by the index
+ bindings::v4l2_frmivaltypes_V4L2_FRMIVAL_TYPE_CONTINUOUS
+ | bindings::v4l2_frmivaltypes_V4L2_FRMIVAL_TYPE_STEPWISE => {
+ Some(FrmIvalTypes::StepWise(unsafe {
+ &self.__bindgen_anon_1.stepwise
+ }))
+ }
+
+ _ => None,
+ }
+ }
+}
+
#[doc(hidden)]
mod ioctl {
use crate::bindings::v4l2_frmivalenum;
