Re: gab-buffer issue

[Mark H Weaver]

Hi Mario,

Mario Domenech Goulart <address@hidden> writes:
> I'm using the CHICKEN port [1] of Guile's gap-buffer implementation and
> noticed a strange behavior in a simple test case.  I can reproduce that
> behavior on Guile 2.0.5 and 2.0.9, but not on Guile 2.0.11.

In Guile versions 2.0.0 - 2.0.9, there was a bug in 'string-copy!' such
that it did not work properly when the source and destination ranges
overlapped.  The characters were always copied starting from the lowest
index, so it would fail when moving a block of characters to higher
indices.  'string-copy!' is used by 'substring-move!', which in turn is
used by 'gb-goto-char'.

The bug was introduced in f846bd1a8f0e0d366fb8bb6944598641bc3dd246 when
the SRFI-13 functions were updated for Unicode, and fixed in
793e8a9317d24298c82389bdf86b8ca17b4ee2f0.

    Regards,
      Mark