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dd: support seek=N when destination is stdout

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Add support for the `seek=N` argument when the destination is stdout
and not a file. Previously, the argument was ignored when writing to
stdout.
This commit is contained in:
Jeffrey Finkelstein 2022-01-23 10:45:17 -05:00
parent 630b5d8577
commit e8df666c2e
2 changed files with 24 additions and 3 deletions
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14
tests/by-util/test_dd.rs
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@ -1,4 +1,4 @@
// spell-checker:ignore fname, tname, fpath, specfile, testfile, unspec, ifile, ofile, outfile, fullblock, urand, fileio, atoe, atoibm, availible, behaviour, bmax, bremain, btotal, cflags, creat, ctable, ctty, datastructures, doesnt, etoa, fileout, fname, gnudd, iconvflags, nocache, noctty, noerror, nofollow, nolinks, nonblock, oconvflags, outfile, parseargs, rlen, rmax, rposition, rremain, rsofar, rstat, sigusr, sigval, wlen, wstat
// spell-checker:ignore fname, tname, fpath, specfile, testfile, unspec, ifile, ofile, outfile, fullblock, urand, fileio, atoe, atoibm, availible, behaviour, bmax, bremain, btotal, cflags, creat, ctable, ctty, datastructures, doesnt, etoa, fileout, fname, gnudd, iconvflags, nocache, noctty, noerror, nofollow, nolinks, nonblock, oconvflags, outfile, parseargs, rlen, rmax, rposition, rremain, rsofar, rstat, sigusr, sigval, wlen, wstat abcdefghijklm
use crate::common::util::*;
@ -592,5 +592,17 @@ fn test_conv_ebcdic_implies_block() {
.stdout_is_bytes(b"\x40\xc1\x40\xc1\x40\xc1\x40\x40");
}
/// Test for seeking forward N bytes in the output file before copying.
#[test]
fn test_seek_bytes() {
// Since the output file is stdout, seeking forward by eight bytes
// results in a prefix of eight null bytes.
new_ucmd!()
.args(&["seek=8", "oflag=seek_bytes"])
.pipe_in("abcdefghijklm\n")
.succeeds()
.stdout_is("\0\0\0\0\0\0\0\0abcdefghijklm\n");
}
// conv=[ascii,ebcdic,ibm], conv=[ucase,lcase], conv=[block,unblock], conv=sync
// TODO: Move conv tests from unit test module