From: Bruno Haible <bruno@clisp.org>
Date: Fri, 3 Mar 2023 13:32:13 +0000 (+0100)
Subject: Document limitation of BusyBox tr.
X-Git-Tag: v2.72d~19
X-Git-Url: http://git.ipfire.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=e704a13c9644f4f4b9a9dd4e215ee7a1707f5850;p=thirdparty%2Fautoconf.git

Document limitation of BusyBox tr.

BusyBox 1.35.0 tr, which is shipped with Alpine Linux 3.17, does not support
the POSIX [x*n] syntax.

* doc/autoconf.texi (Limitations of Usual Tools): Document limitation of 'tr'
from BusyBox.
---

diff --git a/doc/autoconf.texi b/doc/autoconf.texi
index 5d5f613e..b3c708e8 100644
--- a/doc/autoconf.texi
+++ b/doc/autoconf.texi
@@ -20368,6 +20368,20 @@ $ @kbd{echo abc | coreutils/tr bc d}
 add
 @end example
 
+On platforms with the BusyBox tools, @command{tr} does not support the
+@code{[@var{x}*@var{n}]} option syntax.
+
+@example
+$ @kbd{echo abc | tr 'abcd' '[A*4]'}
+[A*
+$ @kbd{echo abc | coreutils/tr 'abcd' '[A*4]'}
+AAA
+$ @kbd{echo xyz | tr 'a-z' '[A*]'}
+]]]
+$ @kbd{echo xyz | coreutils/tr 'a-z' '[A*]'}
+AAA
+@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