From f1f58b88fd53c6e08ad244673a01326b9d587a03 Mon Sep 17 00:00:00 2001 From: cerdelen Date: Sat, 7 Feb 2026 13:09:29 +0100 Subject: [PATCH] unexpand: use buffered read and new tests for chunking read edge case behaviour --- src/uu/unexpand/src/unexpand.rs | 173 ++++++++++-------- tests/by-util/test_unexpand.rs | 111 +++++++++++ ...ing_spaces_after_chunk_without_newline.txt | 5 + ...s_after_chunk_without_newline_expected.txt | 5 + tests/fixtures/unexpand/new_line_in_chunk.txt | 9 + .../new_line_in_chunk_all_normal_chars.txt | 2 + ...ine_in_chunk_all_normal_chars_expected.txt | 2 + .../unexpand/new_line_in_chunk_expected.txt | 9 + ..._into_leading_blanks_into_normal_chars.txt | 2 + ...ding_blanks_into_normal_chars_expected.txt | 2 + ..._few_trailing_spaces_into_normal_chars.txt | 2 + ...ling_spaces_into_normal_chars_expected.txt | 2 + ...chunk_normal_chars_into_leading_blanks.txt | 2 + ...mal_chars_into_leading_blanks_expected.txt | 2 + ..._into_leading_blanks_into_normal_chars.txt | 2 + ...ding_blanks_into_normal_chars_expected.txt | 2 + ...hunk_trailing_spaces_into_normal_chars.txt | 2 + ...ling_spaces_into_normal_chars_expected.txt | 2 + ...eading_spaces_in_chunk_without_newline.txt | 5 + ...aces_in_chunk_without_newline_expected.txt | 5 + ...ailing_spaces_in_chunk_without_newline.txt | 5 + ...aces_in_chunk_without_newline_expected.txt | 5 + 22 files changed, 283 insertions(+), 73 deletions(-) create mode 100644 tests/fixtures/unexpand/leading_spaces_after_chunk_without_newline.txt create mode 100644 tests/fixtures/unexpand/leading_spaces_after_chunk_without_newline_expected.txt create mode 100644 tests/fixtures/unexpand/new_line_in_chunk.txt create mode 100644 tests/fixtures/unexpand/new_line_in_chunk_all_normal_chars.txt create mode 100644 tests/fixtures/unexpand/new_line_in_chunk_all_normal_chars_expected.txt create mode 100644 tests/fixtures/unexpand/new_line_in_chunk_expected.txt create mode 100644 tests/fixtures/unexpand/new_line_in_chunk_few_trailing_blanks_into_normal_chars_into_leading_blanks_into_normal_chars.txt create mode 100644 tests/fixtures/unexpand/new_line_in_chunk_few_trailing_blanks_into_normal_chars_into_leading_blanks_into_normal_chars_expected.txt create mode 100644 tests/fixtures/unexpand/new_line_in_chunk_few_trailing_spaces_into_normal_chars.txt create mode 100644 tests/fixtures/unexpand/new_line_in_chunk_few_trailing_spaces_into_normal_chars_expected.txt create mode 100644 tests/fixtures/unexpand/new_line_in_chunk_normal_chars_into_leading_blanks.txt create mode 100644 tests/fixtures/unexpand/new_line_in_chunk_normal_chars_into_leading_blanks_expected.txt create mode 100644 tests/fixtures/unexpand/new_line_in_chunk_trailing_blanks_into_leading_blanks_into_normal_chars.txt create mode 100644 tests/fixtures/unexpand/new_line_in_chunk_trailing_blanks_into_leading_blanks_into_normal_chars_expected.txt create mode 100644 tests/fixtures/unexpand/new_line_in_chunk_trailing_spaces_into_normal_chars.txt create mode 100644 tests/fixtures/unexpand/new_line_in_chunk_trailing_spaces_into_normal_chars_expected.txt create mode 100644 tests/fixtures/unexpand/trailing_spaces_and_leading_spaces_in_chunk_without_newline.txt create mode 100644 tests/fixtures/unexpand/trailing_spaces_and_leading_spaces_in_chunk_without_newline_expected.txt create mode 100644 tests/fixtures/unexpand/trailing_spaces_in_chunk_without_newline.txt create mode 100644 tests/fixtures/unexpand/trailing_spaces_in_chunk_without_newline_expected.txt diff --git a/src/uu/unexpand/src/unexpand.rs b/src/uu/unexpand/src/unexpand.rs index 14c2b8b0b0a..744783591c9 100644 --- a/src/uu/unexpand/src/unexpand.rs +++ b/src/uu/unexpand/src/unexpand.rs @@ -8,7 +8,7 @@ use clap::{Arg, ArgAction, Command}; use std::ffi::OsString; use std::fs::File; -use std::io::{BufRead, BufReader, BufWriter, Read, Stdout, Write, stdin, stdout}; +use std::io::{BufReader, BufWriter, Read, Stdout, Write, stdin, stdout}; use std::num::IntErrorKind; use std::path::Path; use std::str::from_utf8; @@ -347,7 +347,7 @@ fn next_tabstop(tab_config: &TabConfig, col: usize) -> Option { fn write_tabs( output: &mut BufWriter, tab_config: &TabConfig, - mut scol: usize, + scol: &mut usize, col: usize, prevtab: bool, init: bool, @@ -357,20 +357,20 @@ fn write_tabs( // We never turn a single space before a non-blank into // a tab, unless it's at the start of the line. let ai = init || amode; - if (ai && !prevtab && col > scol + 1) || (col > scol && (init || ai && prevtab)) { - while let Some(nts) = next_tabstop(tab_config, scol) { - if col < scol + nts { + if (ai && !prevtab && col > *scol + 1) || (col > *scol && (init || ai && prevtab)) { + while let Some(nts) = next_tabstop(tab_config, *scol) { + if col < *scol + nts { break; } output.write_all(b"\t")?; - scol += nts; + *scol += nts; } } - while col > scol { + while col > *scol { output.write_all(b" ")?; - scol += 1; + *scol += 1; } Ok(()) } @@ -424,81 +424,88 @@ fn next_char_info(uflag: bool, buf: &[u8], byte: usize) -> (CharType, usize, usi } #[allow(clippy::cognitive_complexity)] +#[allow(clippy::too_many_arguments)] fn unexpand_line( - buf: &mut Vec, + buf: &[u8], output: &mut BufWriter, options: &Options, lastcol: usize, tab_config: &TabConfig, + col: &mut usize, + scol: &mut usize, + leading: &mut bool, ) -> UResult<()> { - // Fast path: if we're not converting all spaces (-a flag not set) - // and the line doesn't start with spaces, just write it directly - if !options.aflag && !buf.is_empty() && buf[0] != b' ' && buf[0] != b'\t' { - output.write_all(buf)?; - buf.truncate(0); - return Ok(()); + // We can only fast forward if we don't need to calculate col/scol + if let Some(b'\n') = buf.last() { + // Fast path: if we're not converting all spaces (-a flag not set) + // and the line doesn't start with spaces, just write it directly + if !options.aflag && !buf.is_empty() && ((buf[0] != b' ' && buf[0] != b'\t') || !*leading) { + *col += buf.len(); + output.write_all(buf)?; + return Ok(()); + } } let mut byte = 0; // offset into the buffer - let mut col = 0; // the current column - let mut scol = 0; // the start col for the current span, i.e., the already-printed width - let mut init = true; // are we at the start of the line? let mut pctype = CharType::Other; - // Fast path for leading spaces in non-UTF8 mode: count consecutive spaces/tabs at start - if !options.uflag && !options.aflag { - // In default mode (not -a), we only convert leading spaces - // So we can batch process them and then copy the rest - while byte < buf.len() { - match buf[byte] { - b' ' => { - col += 1; - byte += 1; - } - b'\t' => { - col += next_tabstop(tab_config, col).unwrap_or(1); - byte += 1; - pctype = CharType::Tab; + // We can only fast forward if we don't need to calculate col/scol + if let Some(b'\n') = buf.last() { + // Fast path for leading spaces in non-UTF8 mode: count consecutive spaces/tabs at start + if !options.uflag && !options.aflag && *leading { + // In default mode (not -a), we only convert leading spaces + // So we can batch process them and then copy the rest + while byte < buf.len() { + match buf[byte] { + b' ' => { + *col += 1; + byte += 1; + } + b'\t' => { + *col += next_tabstop(tab_config, *col).unwrap_or(1); + byte += 1; + pctype = CharType::Tab; + } + _ => break, } - _ => break, } - } - // If we found spaces/tabs, write them as tabs - if byte > 0 { - write_tabs( - output, - tab_config, - 0, - col, - pctype == CharType::Tab, - true, - true, - )?; - } + // If we found spaces/tabs, write them as tabs + if byte > 0 { + write_tabs( + output, + tab_config, + scol, + *col, + pctype == CharType::Tab, + true, + true, + )?; + } - // Write the rest of the line directly (no more tab conversion needed) - if byte < buf.len() { - output.write_all(&buf[byte..])?; + // Write the rest of the line directly (no more tab conversion needed) + if byte < buf.len() { + *leading = false; + output.write_all(&buf[byte..])?; + } + return Ok(()); } - buf.truncate(0); - return Ok(()); } while byte < buf.len() { // when we have a finite number of columns, never convert past the last column - if lastcol > 0 && col >= lastcol { + if lastcol > 0 && *col >= lastcol { write_tabs( output, tab_config, scol, - col, + *col, pctype == CharType::Tab, - init, + *leading, true, )?; output.write_all(&buf[byte..])?; - scol = col; + *scol = *col; break; } @@ -506,19 +513,19 @@ fn unexpand_line( let (ctype, cwidth, nbytes) = next_char_info(options.uflag, buf, byte); // now figure out how many columns this char takes up, and maybe print it - let tabs_buffered = init || options.aflag; + let tabs_buffered = *leading || options.aflag; match ctype { CharType::Space | CharType::Tab => { // compute next col, but only write space or tab chars if not buffering - col += if ctype == CharType::Space { + *col += if ctype == CharType::Space { 1 } else { - next_tabstop(tab_config, col).unwrap_or(1) + next_tabstop(tab_config, *col).unwrap_or(1) }; if !tabs_buffered { output.write_all(&buf[byte..byte + nbytes])?; - scol = col; // now printed up to this column + *scol = *col; // now printed up to this column } } CharType::Other | CharType::Backspace => { @@ -527,23 +534,23 @@ fn unexpand_line( output, tab_config, scol, - col, + *col, pctype == CharType::Tab, - init, + *leading, options.aflag, )?; - init = false; // no longer at the start of a line - col = if ctype == CharType::Other { + *leading = false; // no longer at the start of a line + *col = if ctype == CharType::Other { // use computed width - col + cwidth - } else if col > 0 { + *col + cwidth + } else if *col > 0 { // Backspace case, but only if col > 0 - col - 1 + *col - 1 } else { 0 }; output.write_all(&buf[byte..byte + nbytes])?; - scol = col; // we've now printed up to this column + *scol = *col; // we've now printed up to this column } } @@ -556,12 +563,11 @@ fn unexpand_line( output, tab_config, scol, - col, + *col, pctype == CharType::Tab, - init, + *leading, true, )?; - buf.truncate(0); // clear out the buffer Ok(()) } @@ -573,12 +579,33 @@ fn unexpand_file( lastcol: usize, tab_config: &TabConfig, ) -> UResult<()> { - let mut buf = Vec::new(); + let mut buf = [0u8; 4096]; let mut input = open(file)?; + let mut col = 0; + let mut scol = 0; + let mut leading = true; loop { - match input.read_until(b'\n', &mut buf) { + match input.read(&mut buf) { Ok(0) => break, - Ok(_) => unexpand_line(&mut buf, output, options, lastcol, tab_config)?, + Ok(n) => { + for line in buf[..n].split_inclusive(|b| *b == b'\n') { + unexpand_line( + line, + output, + options, + lastcol, + tab_config, + &mut col, + &mut scol, + &mut leading, + )?; + if let Some(b'\n') = line.last() { + col = 0; + scol = 0; + leading = true; + } + } + } Err(e) => return Err(e.map_err_context(|| file.maybe_quote().to_string())), } } diff --git a/tests/by-util/test_unexpand.rs b/tests/by-util/test_unexpand.rs index d29fecfd360..489a826db52 100644 --- a/tests/by-util/test_unexpand.rs +++ b/tests/by-util/test_unexpand.rs @@ -366,3 +366,114 @@ fn test_extended_tabstop_syntax() { .stdout_is(expected); } } + +#[test] +fn test_buffered_reads_new_line_no_tabs_in_first_chunk() { + // fixture has newlines in first chunk and has leading spaces after newline in chunk + new_ucmd!() + .args(&["new_line_in_chunk.txt"]) + .succeeds() + .stdout_is_fixture("new_line_in_chunk_expected.txt"); +} + +#[test] +fn test_leading_spaces_after_chunk_without_newline() { + // fixture has newlines in first chunk and has leading spaces after newline in chunk + new_ucmd!() + .args(&["leading_spaces_after_chunk_without_newline.txt"]) + .succeeds() + .stdout_is_fixture("leading_spaces_after_chunk_without_newline_expected.txt"); +} + +#[test] +fn test_trailing_spaces_and_leading_spaces_in_chunk_without_newline() { + // fixture has newlines in first chunk and has leading spaces after newline in chunk + new_ucmd!() + .args(&["trailing_spaces_and_leading_spaces_in_chunk_without_newline.txt"]) + .succeeds() + .stdout_is_fixture( + "trailing_spaces_and_leading_spaces_in_chunk_without_newline_expected.txt", + ); +} + +#[test] +fn test_trailing_spaces_in_chunk_without_newline() { + // fixture has newlines in first chunk and has leading spaces after newline in chunk + new_ucmd!() + .args(&["trailing_spaces_in_chunk_without_newline.txt"]) + .succeeds() + .stdout_is_fixture("trailing_spaces_in_chunk_without_newline_expected.txt"); +} + +#[test] +fn test_new_line_in_chunk_all_normal_chars() { + // fixture has newlines in first chunk and has leading spaces after newline in chunk + new_ucmd!() + .args(&["new_line_in_chunk_all_normal_chars.txt"]) + .succeeds() + .stdout_is_fixture("new_line_in_chunk_all_normal_chars_expected.txt"); +} + +#[test] +fn test_new_line_in_chunk_few_trailing_blanks_into_normal_chars_into_leading_blanks_into_normal_chars() + { + // fixture has newlines in first chunk and has leading spaces after newline in chunk + new_ucmd!() + .args(&["new_line_in_chunk_few_trailing_blanks_into_normal_chars_into_leading_blanks_into_normal_chars.txt"]) + .succeeds() + .stdout_is_fixture("new_line_in_chunk_few_trailing_blanks_into_normal_chars_into_leading_blanks_into_normal_chars_expected.txt"); +} + +#[test] +fn test_new_line_in_chunk_few_trailing_spaces_into_normal_chars() { + // fixture has newlines in first chunk and has leading spaces after newline in chunk + new_ucmd!() + .args(&["new_line_in_chunk_few_trailing_spaces_into_normal_chars.txt"]) + .succeeds() + .stdout_is_fixture("new_line_in_chunk_few_trailing_spaces_into_normal_chars_expected.txt"); +} + +#[test] +fn test_new_line_in_chunk_normal_chars_into_leading_blanks() { + // fixture has newlines in first chunk and has leading spaces after newline in chunk + new_ucmd!() + .args(&["new_line_in_chunk_normal_chars_into_leading_blanks.txt"]) + .succeeds() + .stdout_is_fixture("new_line_in_chunk_normal_chars_into_leading_blanks_expected.txt"); +} + +#[test] +fn test_new_line_in_chunk_trailing_blanks_into_leading_blanks_into_normal_chars() { + // fixture has newlines in first chunk and has leading spaces after newline in chunk + new_ucmd!() + .args(&["new_line_in_chunk_trailing_blanks_into_leading_blanks_into_normal_chars.txt"]) + .succeeds() + .stdout_is_fixture( + "new_line_in_chunk_trailing_blanks_into_leading_blanks_into_normal_chars_expected.txt", + ); +} + +#[test] +fn test_new_line_in_chunk_trailing_spaces_into_normal_chars() { + // fixture has newlines in first chunk and has leading spaces after newline in chunk + new_ucmd!() + .args(&["new_line_in_chunk_trailing_spaces_into_normal_chars.txt"]) + .succeeds() + .stdout_is_fixture("new_line_in_chunk_trailing_spaces_into_normal_chars_expected.txt"); +} + +// +// i need tests for +// 4050 chars, '\n', normal chars , normal chars +// 4050 chars, '\n', normal chars , leading blanks normal chars +// +// 4050 chars, '\n', all blanks until 4096, normal chars +// 4050 chars, '\n', all blanks until 4096, leading blanks normal chars +// +// 4050 chars, '\n', a few blanks until 4096, normal chars +// 4050 chars, '\n', a few blanks until 4096, leading blanks normal chars +// +// +// +// +// diff --git a/tests/fixtures/unexpand/leading_spaces_after_chunk_without_newline.txt b/tests/fixtures/unexpand/leading_spaces_after_chunk_without_newline.txt new file mode 100644 index 00000000000..d2a1d418d8a --- /dev/null +++ b/tests/fixtures/unexpand/leading_spaces_after_chunk_without_newline.txt @@ -0,0 +1,5 @@ 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+ test + +few + pldwq diff --git a/tests/fixtures/unexpand/leading_spaces_after_chunk_without_newline_expected.txt b/tests/fixtures/unexpand/leading_spaces_after_chunk_without_newline_expected.txt new file mode 100644 index 00000000000..d2a1d418d8a --- /dev/null +++ b/tests/fixtures/unexpand/leading_spaces_after_chunk_without_newline_expected.txt @@ -0,0 +1,5 @@ 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+ test + +few + pldwq diff --git a/tests/fixtures/unexpand/new_line_in_chunk.txt b/tests/fixtures/unexpand/new_line_in_chunk.txt new file mode 100644 index 00000000000..f643b5bbf23 --- /dev/null +++ b/tests/fixtures/unexpand/new_line_in_chunk.txt @@ -0,0 +1,9 @@ +000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000 + 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+000000000000000000 0 000 000 00 0 0 0 0 + Lorem Ipsum test file + + + + +hello diff --git a/tests/fixtures/unexpand/new_line_in_chunk_all_normal_chars.txt b/tests/fixtures/unexpand/new_line_in_chunk_all_normal_chars.txt new file mode 100644 index 00000000000..21ee70caa8f --- /dev/null +++ b/tests/fixtures/unexpand/new_line_in_chunk_all_normal_chars.txt @@ -0,0 +1,2 @@ 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+000000000000000000 0 000 000 00 0 0 0 0 + Lorem Ipsum test file + + + + +hello diff --git a/tests/fixtures/unexpand/new_line_in_chunk_few_trailing_blanks_into_normal_chars_into_leading_blanks_into_normal_chars.txt b/tests/fixtures/unexpand/new_line_in_chunk_few_trailing_blanks_into_normal_chars_into_leading_blanks_into_normal_chars.txt new file mode 100644 index 00000000000..499865b028e --- /dev/null +++ b/tests/fixtures/unexpand/new_line_in_chunk_few_trailing_blanks_into_normal_chars_into_leading_blanks_into_normal_chars.txt @@ -0,0 +1,2 @@ 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+ 00000000 0000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000 \ No newline at end of file diff --git a/tests/fixtures/unexpand/new_line_in_chunk_few_trailing_blanks_into_normal_chars_into_leading_blanks_into_normal_chars_expected.txt b/tests/fixtures/unexpand/new_line_in_chunk_few_trailing_blanks_into_normal_chars_into_leading_blanks_into_normal_chars_expected.txt new file mode 100644 index 00000000000..e3c3e87ec63 --- /dev/null +++ b/tests/fixtures/unexpand/new_line_in_chunk_few_trailing_blanks_into_normal_chars_into_leading_blanks_into_normal_chars_expected.txt @@ -0,0 +1,2 @@ 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