Hi Eric,
About 'tr' on Solaris:
> +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
So it's indeed two different bugs: one regarding NUL bytes in the input,
another one regarding '\0' as part of the arguments. I propose to make
this clearer, including the examples. In particular, make it clear that
the first bug occurs also when the arguments don't ask to convert from or
to '\0'.
Proposed patch, to be applied with "patch -p0".
2009-12-31 Bruno Haible <br...@clisp.org>
Improve documentation on Solaris tr bugs.
* doc/autoconf.texi (Limitations of Usual Tools) <tr>: Refine
description of NUL handling by Solaris tr.
*** doc/autoconf.texi.orig Thu Dec 31 14:14:35 2009
--- doc/autoconf.texi Thu Dec 31 14:12:27 2009
***************
*** 18347,18366 ****
@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
@command{/usr/xpg6/bin/tr} if that is available.
@example
! $ @kbd{printf 'ab\0c' | /usr/ucb/tr 'a\0' '\0d' | od -An -tx1}
61 62 63
! $ @kbd{printf 'ab\0c' | /usr/bin/tr 'a\0' '\0d' | od -An -tx1}
! 00 62 63
! $ @kbd{printf 'ab\0c' | /usr/xpg4/bin/tr 'a\0' '\0d' | od -An -tx1}
! 00 62 64 63
@end example
@end table
--- 18347,18377 ----
@end example
Posix requires @command{tr} to operate on binary files. But at least
! 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 'a\0b' | /usr/ucb/tr x x | od -An -tx1}
! 61 62
! $ @kbd{printf 'a\0b' | /usr/bin/tr x x | od -An -tx1}
! 61 62
! $ @kbd{printf 'a\0b' | /usr/xpg4/bin/tr x x | od -An -tx1}
! 61 00 62
! @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}
61 62 63
! $ @kbd{printf 'abc' | /usr/bin/tr 'bc' '\0d' | od -An -tx1}
! 61 00 64
! $ @kbd{printf 'abc' | /usr/xpg4/bin/tr 'bc' '\0d' | od -An -tx1}
! 61 00 64
@end example
@end table
