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Improve documentation on Solaris tr bugs.

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* doc/autoconf.texi (Limitations of Usual Tools) <tr>: Refine
description of NUL handling by Solaris tr.

Signed-off-by: Eric Blake <ebb9@byu.net>
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Bruno Haible 2009-12-31 06:50:44 -07:00 committed by Eric Blake
parent 57aa091236
commit 6c11abd6fc
2 changed files with 27 additions and 10 deletions
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@ -1,3 +1,9 @@
2009-12-31 Bruno Haible <bruno@clisp.org>
Improve documentation on Solaris tr bugs.
* doc/autoconf.texi (Limitations of Usual Tools) <tr>: Refine
description of NUL handling by Solaris tr.
2009-12-31 Eric Blake <ebb9@byu.net>
Another tr tweak.

31
doc/autoconf.texi
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@ -18347,20 +18347,31 @@ add
@end example
Posix requires @command{tr} to operate on binary files. But at least
Solaris @command{/usr/ucb/tr} fails to handle @samp{\0} as the octal
escape for @code{NUL}, and Solaris @command{/usr/bin/tr} silently
discards @code{NUL} in the input prior to doing any translation. When
using @command{tr} to process a binary file that may contain @code{NUL}
bytes, it is necessary to use @command{/usr/xpg4/bin/tr} instead, or
Solaris @command{/usr/ucb/tr} and @command{/usr/bin/tr} silently discard
@code{NUL} in the input prior to doing any translation. When using
@command{tr} to process a binary file that may contain @code{NUL} bytes,
it is necessary to use @command{/usr/xpg4/bin/tr} instead, or
@command{/usr/xpg6/bin/tr} if that is available.
@example
$ @kbd{printf 'ab\0c' | /usr/ucb/tr 'a\0' '\0d' | od -An -tx1}
$ @kbd{printf 'a\0b' | /usr/ucb/tr x x | od -An -tx1}
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$ @kbd{printf 'a\0b' | /usr/bin/tr x x | od -An -tx1}
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$ @kbd{printf 'a\0b' | /usr/xpg4/bin/tr x x | od -An -tx1}
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@end example
Solaris @command{/usr/ucb/tr} additionally fails to handle @samp{\0} as the
octal escape for @code{NUL}.
@example
$ @kbd{printf 'abc' | /usr/ucb/tr 'bc' '\0d' | od -An -tx1}
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$ @kbd{printf 'ab\0c' | /usr/bin/tr 'a\0' '\0d' | od -An -tx1}
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$ @kbd{printf 'ab\0c' | /usr/xpg4/bin/tr 'a\0' '\0d' | od -An -tx1}
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$ @kbd{printf 'abc' | /usr/bin/tr 'bc' '\0d' | od -An -tx1}
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$ @kbd{printf 'abc' | /usr/xpg4/bin/tr 'bc' '\0d' | od -An -tx1}
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@end example
@end table