[hackers] [libgrapheme] Do not falsely read entire buffer instead of simply the filled with || Laslo Hunhold

[git]

commit b9e1d4bbd4ce6a539999560c1cc863b645a080cd
Author:     Laslo Hunhold <d...@frign.de>
AuthorDate: Thu Nov 24 13:29:31 2022 +0100
Commit:     Laslo Hunhold <d...@frign.de>
CommitDate: Thu Nov 24 15:51:06 2022 +0100

    Do not falsely read entire buffer instead of simply the filled with
    
    This was caught via dynamic analysis (clang asan), which I can definitely
    recommend.
    
    Rust evangelists might see this as a prime example for why C is bad, but
    I still think the benefits outweigh the risks if you consider the
    maturity of tooling to catch these kinds of errors. In an ideal world we
    would all be programming in Ada, but C's portability is unmatched.
    
    Signed-off-by: Laslo Hunhold <d...@frign.de>

diff --git a/test/bidirectional.c b/test/bidirectional.c
index 8646afe..f7c6081 100644
--- a/test/bidirectional.c
+++ b/test/bidirectional.c
@@ -34,7 +34,7 @@ main(int argc, char *argv[])
                                bidirectional_test[i].cplen,
                                bidirectional_test[i].mode[m], data, datalen);
                        grapheme_bidirectional_get_line_embedding_levels(
-                               data, datalen, lev);
+                               data, ret, lev);
 
                        if (ret != bidirectional_test[i].cplen ||
                            ret > datalen) {