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Merge pull request #3156 from jfinkels/dd-cbs-blocks

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dd: pad partial record with spaces in some cases
This commit is contained in:
Sylvestre Ledru 2022-03-03 22:35:58 +01:00 • committed by GitHub
commit 66e9956595
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GPG key ID: 4AEE18F83AFDEB23
2 changed files with 57 additions and 21 deletions
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53
src/uu/dd/src/blocks.rs
View file

@ -14,10 +14,17 @@ use std::io::Read;
const NEWLINE: u8 = b'\n';
const SPACE: u8 = b' ';
/// Splits the content of buf into cbs-length blocks
/// Appends padding as specified by conv=block and cbs=N
/// Expects ascii encoded data
fn block(buf: &[u8], cbs: usize, rstat: &mut ReadStat) -> Vec<Vec<u8>> {
/// Split a slice into chunks, padding or truncating as necessary.
///
/// The slice `buf` is split on newlines, then each block is resized
/// to `cbs` bytes, padding with spaces if necessary. This function
/// expects the input bytes to be ASCII-encoded.
///
/// If `sync` is true and there has been at least one partial record
/// read from the input (as indicated in `rstat`), then leave an
/// all-spaces block at the end. Otherwise, remove the last block if
/// it is all spaces.
fn block(buf: &[u8], cbs: usize, sync: bool, rstat: &mut ReadStat) -> Vec<Vec<u8>> {
let mut blocks = buf
.split(|&e| e == NEWLINE)
.map(|split| split.to_vec())
@ -31,8 +38,11 @@ fn block(buf: &[u8], cbs: usize, rstat: &mut ReadStat) -> Vec<Vec<u8>> {
blocks
});
// If `sync` is true and there has been at least one partial
// record read from the input, then leave the all-spaces block at
// the end. Otherwise, remove it.
if let Some(last) = blocks.last() {
if last.iter().all(|&e| e == SPACE) {
if (!sync || rstat.reads_partial == 0) && last.iter().all(|&e| e == SPACE) {
blocks.pop();
}
}
@ -100,7 +110,7 @@ pub(crate) fn conv_block_unblock_helper<R: Read>(
// ascii input so perform the block first
let cbs = i.cflags.block.unwrap();
let mut blocks = block(&buf, cbs, rstat);
let mut blocks = block(&buf, cbs, i.cflags.sync.is_some(), rstat);
if let Some(ct) = i.cflags.ctable {
for buf in &mut blocks {
@ -119,7 +129,10 @@ pub(crate) fn conv_block_unblock_helper<R: Read>(
apply_conversion(&mut buf, ct);
}
let blocks = block(&buf, cbs, rstat).into_iter().flatten().collect();
let blocks = block(&buf, cbs, i.cflags.sync.is_some(), rstat)
.into_iter()
.flatten()
.collect();
Ok(blocks)
} else if should_unblock_then_conv(i) {
@ -167,7 +180,7 @@ mod tests {
fn block_test_no_nl() {
let mut rs = ReadStat::default();
let buf = [0u8, 1u8, 2u8, 3u8];
let res = block(&buf, 4, &mut rs);
let res = block(&buf, 4, false, &mut rs);
assert_eq!(res, vec![vec![0u8, 1u8, 2u8, 3u8],]);
}
@ -176,7 +189,7 @@ mod tests {
fn block_test_no_nl_short_record() {
let mut rs = ReadStat::default();
let buf = [0u8, 1u8, 2u8, 3u8];
let res = block(&buf, 8, &mut rs);
let res = block(&buf, 8, false, &mut rs);
assert_eq!(
res,
@ -188,7 +201,7 @@ mod tests {
fn block_test_no_nl_trunc() {
let mut rs = ReadStat::default();
let buf = [0u8, 1u8, 2u8, 3u8, 4u8];
let res = block(&buf, 4, &mut rs);
let res = block(&buf, 4, false, &mut rs);
// Commented section(s) should be truncated and appear for reference only.
assert_eq!(res, vec![vec![0u8, 1u8, 2u8, 3u8 /*, 4u8*/],]);
@ -201,7 +214,7 @@ mod tests {
let buf = [
0u8, 1u8, 2u8, 3u8, 4u8, NEWLINE, 0u8, 1u8, 2u8, 3u8, 4u8, NEWLINE, 5u8, 6u8, 7u8, 8u8,
];
let res = block(&buf, 4, &mut rs);
let res = block(&buf, 4, false, &mut rs);
assert_eq!(
res,
@ -221,7 +234,7 @@ mod tests {
fn block_test_surrounded_nl() {
let mut rs = ReadStat::default();
let buf = [0u8, 1u8, 2u8, 3u8, NEWLINE, 4u8, 5u8, 6u8, 7u8, 8u8];
let res = block(&buf, 8, &mut rs);
let res = block(&buf, 8, false, &mut rs);
assert_eq!(
res,
@ -238,7 +251,7 @@ mod tests {
let buf = [
0u8, 1u8, 2u8, 3u8, NEWLINE, 4u8, NEWLINE, 5u8, 6u8, 7u8, 8u8, 9u8,
];
let res = block(&buf, 8, &mut rs);
let res = block(&buf, 8, false, &mut rs);
assert_eq!(
res,
@ -256,7 +269,7 @@ mod tests {
let buf = [
0u8, 1u8, 2u8, 3u8, NEWLINE, 4u8, 5u8, 6u8, 7u8, NEWLINE, 8u8, 9u8,
];
let res = block(&buf, 8, &mut rs);
let res = block(&buf, 8, false, &mut rs);
assert_eq!(
res,
@ -272,7 +285,7 @@ mod tests {
fn block_test_end_nl_diff_cbs_block() {
let mut rs = ReadStat::default();
let buf = [0u8, 1u8, 2u8, 3u8, NEWLINE];
let res = block(&buf, 4, &mut rs);
let res = block(&buf, 4, false, &mut rs);
assert_eq!(res, vec![vec![0u8, 1u8, 2u8, 3u8],]);
}
@ -281,7 +294,7 @@ mod tests {
fn block_test_end_nl_same_cbs_block() {
let mut rs = ReadStat::default();
let buf = [0u8, 1u8, 2u8, NEWLINE];
let res = block(&buf, 4, &mut rs);
let res = block(&buf, 4, false, &mut rs);
assert_eq!(res, vec![vec![0u8, 1u8, 2u8, SPACE]]);
}
@ -290,7 +303,7 @@ mod tests {
fn block_test_double_end_nl() {
let mut rs = ReadStat::default();
let buf = [0u8, 1u8, 2u8, NEWLINE, NEWLINE];
let res = block(&buf, 4, &mut rs);
let res = block(&buf, 4, false, &mut rs);
assert_eq!(
res,
@ -302,7 +315,7 @@ mod tests {
fn block_test_start_nl() {
let mut rs = ReadStat::default();
let buf = [NEWLINE, 0u8, 1u8, 2u8, 3u8];
let res = block(&buf, 4, &mut rs);
let res = block(&buf, 4, false, &mut rs);
assert_eq!(
res,
@ -314,7 +327,7 @@ mod tests {
fn block_test_double_surrounded_nl_no_trunc() {
let mut rs = ReadStat::default();
let buf = [0u8, 1u8, 2u8, 3u8, NEWLINE, NEWLINE, 4u8, 5u8, 6u8, 7u8];
let res = block(&buf, 8, &mut rs);
let res = block(&buf, 8, false, &mut rs);
assert_eq!(
res,
@ -332,7 +345,7 @@ mod tests {
let buf = [
0u8, 1u8, 2u8, 3u8, NEWLINE, NEWLINE, 4u8, 5u8, 6u8, 7u8, 8u8,
];
let res = block(&buf, 4, &mut rs);
let res = block(&buf, 4, false, &mut rs);
assert_eq!(
res,

25
tests/by-util/test_dd.rs
View file

@ -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 abcdefghijklm abcdefghi
// 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 abcdefghi nabcde nabcdefg abcdefg
use crate::common::util::*;
@ -1116,3 +1116,26 @@ fn test_truncated_record() {
fn test_outfile_dev_null() {
new_ucmd!().arg("of=/dev/null").succeeds().no_stdout();
}
#[test]
fn test_block_sync() {
new_ucmd!()
.args(&["ibs=5", "cbs=5", "conv=block,sync", "status=noxfer"])
.pipe_in("012\nabcde\n")
.succeeds()
// blocks: 1 2
.stdout_is("012 abcde")
.stderr_is("2+0 records in\n0+1 records out\n");
// It seems that a partial record in is represented as an
// all-spaces block at the end of the output. The "1 truncated
// record" line is present in the status report due to the line
// "abcdefg\n" being truncated to "abcde".
new_ucmd!()
.args(&["ibs=5", "cbs=5", "conv=block,sync", "status=noxfer"])
.pipe_in("012\nabcdefg\n")
.succeeds()
// blocks: 1 2 3
.stdout_is("012 abcde ")
.stderr_is("2+1 records in\n0+1 records out\n1 truncated record\n");
}