feat: add get/set reserved bytes to c api

Author: levydsa

bindings/c/include/libsql.h

@@ -107,6 +107,10 @@ int libsql_load_extension(libsql_connection_t conn,
                           const char *entry_point,
                           const char **out_err_msg);
 
+int libsql_set_reserved_bytes(libsql_connection_t conn, int32_t reserved_bytes, const char **out_err_msg);
+
+int libsql_get_reserved_bytes(libsql_connection_t conn, int32_t *reserved_bytes, const char **out_err_msg);
+
 int libsql_reset(libsql_connection_t conn, const char **out_err_msg);
 
 void libsql_disconnect(libsql_connection_t conn);

bindings/c/src/lib.rs

@@ -549,6 +549,41 @@ pub unsafe extern "C" fn libsql_load_extension(
     0
 }
 
+#[no_mangle]
+pub unsafe extern "C" fn libsql_set_reserved_bytes(
+    conn: libsql_connection_t,
+    reserved_bytes: i32,
+    out_err_msg: *mut *const std::ffi::c_char,
+) -> std::ffi::c_int {
+    if conn.is_null() {
+        set_err_msg("Null connection".to_string(), out_err_msg);
+        return 1;
+    }
+    let conn = conn.get_ref();
+    if let Err(err) = conn.set_reserved_bytes(reserved_bytes) {
+        set_err_msg(err.to_string(), out_err_msg);
+    }
+    0
+}
+
+#[no_mangle]
+pub unsafe extern "C" fn libsql_get_reserved_bytes(
+    conn: libsql_connection_t,
+    reserved_bytes: *mut i32,
+    out_err_msg: *mut *const std::ffi::c_char,
+) -> std::ffi::c_int {
+    if conn.is_null() {
+        set_err_msg("Null connection".to_string(), out_err_msg);
+        return 1;
+    }
+    let conn = conn.get_ref();
+    match conn.get_reserved_bytes() {
+        Ok(v) => *reserved_bytes = v,
+        Err(err) => set_err_msg(err.to_string(), out_err_msg),
+    }
+    0
+}
+
 #[no_mangle]
 pub unsafe extern "C" fn libsql_reset(
     conn: libsql_connection_t,