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dd: block/unblock on ebcdic/ascii conversions

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Update `dd` so that the conversion `conv=ascii` implies `conv=unblock`
and, symmetrically, the conversion `conv=ebcdic` implies `conv=block`.
This commit is contained in:
Jeffrey Finkelstein 2022-01-22 21:01:16 -05:00
parent 8a787fe028
commit 1c8df122d7
3 changed files with 62 additions and 0 deletions
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33
tests/by-util/test_dd.rs
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@ -559,5 +559,38 @@ fn test_unicode_filenames() {
);
}
#[test]
fn test_conv_ascii_implies_unblock() {
// 0x40 = 0o100 = 64, which gets converted to ' '
// 0xc1 = 0o301 = 193, which gets converted to 'A'
//
// `conv=ascii` implies `conv=unblock`, which means trailing paces
// are stripped and a newline is appended at the end of each
// block.
//
// `cbs=4` means use a conversion block size of 4 bytes per block.
new_ucmd!()
.args(&["conv=ascii", "cbs=4"])
.pipe_in(b"\x40\xc1\x40\xc1\x40\xc1\x40\x40".to_vec())
.succeeds()
.stdout_is(" A A\n A\n");
}
#[test]
fn test_conv_ebcdic_implies_block() {
// 0x40 = 0o100 = 64, which is the result of converting from ' '
// 0xc1 = 0o301 = 193, which is the result of converting from 'A'
//
// `conv=ebcdic` implies `conv=block`, which means trailing spaces
// are added to pad each block.
//
// `cbs=4` means use a conversion block size of 4 bytes per block.
new_ucmd!()
.args(&["conv=ebcdic", "cbs=4"])
.pipe_in(" A A\n A\n")
.succeeds()
.stdout_is_bytes(b"\x40\xc1\x40\xc1\x40\xc1\x40\x40");
}
// conv=[ascii,ebcdic,ibm], conv=[ucase,lcase], conv=[block,unblock], conv=sync
// TODO: Move conv tests from unit test module