[Bug 8506] ash: corrupted expansion of ${#var} if $var contains UTF-8 characters

[bugzilla at busybox.net]

https://bugs.busybox.net/show_bug.cgi?id=8506

--- Comment #4 from Hans PUFAL <hans.pufal at gmail.com> ---
I have a possible fix but need someone who knows the code to check for any side
effects.

In file ash.c, line 6703

    if (discard)
        STADJUST(-len, expdest);

At this point len is the unicode string length and STADJUST is removing the 
$var string from the destination. The length of the removal should be the
number of bytes in the string not the unicode string length.

Changing line 6704 to 

        STADJUST(-strlen (p), expdest);

Makes the tests run correctly.

I am fairly sure of my analisys but am unsure if this could cause problems
in other situations.

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