diff --git a/radio.c b/radio.c
index 4a1cb02..555cf4b 100644
--- a/radio.c
+++ b/radio.c
@@ -153,26 +153,3 @@ badline:            fprintf(stderr, "Invalid line: '%s'\n", line);
     fclose(conf);
     device->update_timestamp(device);
 }
-
-//
-// Update contacts database on the device.
-//
-void radio_write_csv(radio_device_t* device, const char *filename)
-{
-    FILE *csv;
-
-    if (!device->write_csv) {
-        fprintf(stderr, "%s does not support CSV database.\n", device->name);
-        return;
-    }
-
-    csv = fopen(filename, "r");
-    if (! csv) {
-        perror(filename);
-        return;
-    }
-    fprintf(stderr, "Read file '%s'.\n", filename);
-
-    device->write_csv(device, csv);
-    fclose(csv);
-}
diff --git a/src/radio.rs b/src/radio.rs
index 29eaf36..45ef5c7 100644
--- a/src/radio.rs
+++ b/src/radio.rs
@@ -12,7 +12,7 @@ pub struct Radio {
 
 static mut RADIO_TABLE: [(&'static str, &'static radio_device_t); 16] = unsafe {
   [
-    ("DR780", &radio_md380),     // TYT MD-380, Retevis RT3, RT8
+    ("DR780",      &radio_md380),     // TYT MD-380, Retevis RT3, RT8
     ("MD390",      &radio_md390),     // TYT MD-390
     ("MD-UV380",   &radio_uv380),     // TYT MD-UV380
     ("MD-UV390",   &radio_uv390),     // TYT MD-UV390, Retevis RT3S
@@ -37,7 +37,6 @@ extern {
   fn set_active_device(device: *const radio_device_t);
 
   fn radio_parse_config(device: *const radio_device_t, filename: *const c_char);
-  fn radio_write_csv(device: *const radio_device_t, filename: *const c_char);
 
   fn dfu_init(vid: c_uint, pid: c_uint) -> *const c_char;
   fn dfu_reboot();
@@ -361,12 +360,28 @@ pub fn print_version(radio: &Radio) {
   }
 }
 
-/// Update CSV contacts database.
+/// Update contacts database on the device.
 pub fn write_csv(radio: &Radio, filename: &str) {
-  let device = radio.ptr;
-  let filename = CString::new(filename.to_string()).unwrap();
+  let device = radio.ptr as *mut radio_device_t;
   unsafe {
-    radio_write_csv(device, filename.as_ptr());
+    let write_csv_fn = match (*device).write_csv {
+      Some(func) => func,
+      None => {
+        let name_ptr = (*device).name;
+        let name = CStr::from_ptr(name_ptr).to_str().unwrap();
+        eprintln!("{} does not support CSV database.", name);
+        exit(-1);
+      }
+    };
+
+    let file = std::fs::File::open(filename).unwrap();
+    eprintln!("Read file '{}.", filename);
+
+    let fd = file.as_raw_fd();
+    let mode = CString::new("r").unwrap();
+    let file = libc::fdopen(fd, mode.as_ptr());
+    write_csv_fn(device, file);
+    libc::fclose(file);
   }
 }