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dd: show warning if skipping past end of input

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Show a warning if the `skip=N` command-line argument would cause `dd`
to skip past the end of the input. For example:

    $ printf "abcd" | dd bs=1 skip=5 count=0 status=noxfer
    'standard input': cannot skip to specified offset
    0+0 records in
    0+0 records out
This commit is contained in:
Jeffrey Finkelstein 2022-02-04 21:44:26 -05:00
parent 84d4f24b8c
commit 9f8ec676c5
2 changed files with 19 additions and 1 deletions
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13
tests/by-util/test_dd.rs
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@ -624,5 +624,18 @@ 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",
);
}
// conv=[ascii,ebcdic,ibm], conv=[ucase,lcase], conv=[block,unblock], conv=sync
// TODO: Move conv tests from unit test module