mikros: Make FileWriteMode a struct to allow both truncate and append at once

library/std/src/os/mikros/mod.rs

@@ -11,7 +11,7 @@
 
 mod errno;
 
-use serde::{Serialize, Serializer, ser::SerializeTupleVariant};
+use serde::{Serialize, Serializer, ser::{SerializeTupleVariant, SerializeStruct}};
 
 #[stable(feature = "mikros", since = "1.80.0")]
 pub use errno::Errno;
@@ -27,10 +27,9 @@ pub enum FileCreationMode {
 
 #[stable(feature = "mikros", since = "1.80.0")]
 #[derive(Copy, Clone, Debug, PartialEq, Eq)]
-pub enum FileWriteMode {
-    Start,
-    Truncate,
-    Append
+pub struct FileWriteMode {
+    pub truncate: bool,
+    pub append: bool,
 }
 
 #[stable(feature = "mikros", since = "1.80.0")]
@@ -99,11 +98,10 @@ fn serialize<S>(&self, serializer: S) -> Result<S::Ok, S::Error>
     where
         S: Serializer,
     {
-        match self {
-            Self::Start => serializer.serialize_unit_variant("FileWriteMode", 0, "Start"),
-            Self::Truncate => serializer.serialize_unit_variant("FileWriteMode", 1, "Truncate"),
-            Self::Append => serializer.serialize_unit_variant("FileWriteMode", 2, "Append"),
-        }
+        let mut ser = serializer.serialize_struct("FileWriteMode", 2)?;
+        ser.serialize_field("truncate", &self.truncate)?;
+        ser.serialize_field("append", &self.append)?;
+        ser.end()
     }
 }
 

library/std/src/sys/pal/mikros/fs.rs

@@ -374,11 +374,9 @@ fn get_open_mode(&self) -> io::Result<FileOpenMode> {
             (true, false) => FileCreationMode::Create,
             (_, true) => FileCreationMode::ForceCreate,
         };
-        let wr_mode = match (self.append, self.truncate) {
-            (false, false) => FileWriteMode::Start,
-            (false, true) => FileWriteMode::Truncate,
-            (true, false) => FileWriteMode::Append,
-            (true, true) => unreachable!()
+        let wr_mode = FileWriteMode {
+            truncate: self.truncate,
+            append: self.append,
         };
         match self.read {
             false => Ok(FileOpenMode::Write(wr_mode, cr_mode)),