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doc: dd: document the behavior of conv flags on multibyte characters

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* doc/coreutils.texi (dd invocation): Document the behavior of 'dd' on
multibyte characters and some unspecified behavior that will be
documented in a future POSIX release [1].

[1] https://austingroupbugs.net/view.php?id=1959
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Collin Funk
2025-12-12 23:11:09 -08:00
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@@ -9280,6 +9280,17 @@ Change lowercase letters to uppercase.
The @samp{lcase} and @samp{ucase} conversions are mutually exclusive.
@c https://austingroupbugs.net/view.php?id=1959
POSIX leaves the behavior of @samp{lcase} and @samp{ucase} unspecified
on multibyte characters. GNU @command{dd} supports only unibyte
conversion, because multibyte characters may cross block boundaries and
case conversion may change the length of characters.
POSIX also leaves the behavior of @samp{lcase} and @samp{ucase}
unspecified if used with @samp{ascii}, @samp{ebcdic}, or @samp{ibm}.
GNU @command{dd} will perform the case conversion and then perform the
character set conversion.
@item sparse
@opindex sparse
Try to seek rather than write NUL output blocks.