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

[bugzilla at busybox.net]

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

            Bug ID: 8506
           Summary: ash: corrupted expansion of ${#var} if $var contains
                    UTF-8 characters
           Product: Busybox
           Version: 1.24.x
          Hardware: All
                OS: All
            Status: NEW
          Severity: critical
          Priority: P5
         Component: Other
          Assignee: unassigned at busybox.net
          Reporter: martijn at inlv.org
                CC: busybox-cvs at busybox.net

Created attachment 6246
  --> https://bugs.busybox.net/attachment.cgi?id=6246&action=edit
Examples of corrupted output of ${#var}

Given a variable $var, the expression ${#var} is supposed to expand to the
length in characters of that variable's contents. As of busybox 1.24.x ash, the
expansion of ${#var} is corrupted if $var contains any UTF-8 characters. For
each UTF-8 character, one byte of the variable's content is prepended to the
number.

Bug confirmed in busybox-1.24.1 ash and busybox-current ash. The bug was *not*
present in busybox-1.23.2 ash and prior.

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