Merge pull request #3066 from jfinkels/dd-skip-beyond-file

dd: show warning if skipping past end of input

tests/by-util/test_dd.rs

@@ -657,6 +657,19 @@ fn test_seek_bytes() {
         .stdout_is("\0\0\0\0\0\0\0\0abcdefghijklm\n");
 }
 
+/// Test for skipping beyond the number of bytes in a file.
+#[test]
+fn test_skip_beyond_file() {
+    new_ucmd!()
+        .args(&["bs=1", "skip=5", "count=0", "status=noxfer"])
+        .pipe_in("abcd")
+        .succeeds()
+        .no_stdout()
+        .stderr_contains(
+            "'standard input': cannot skip to specified offset\n0+0 records in\n0+0 records out\n",
+        );
+}
+
 #[test]
 fn test_seek_do_not_overwrite() {
     let (at, mut ucmd) = at_and_ucmd!();