BLI_string_utf8: add buffer size arg to BLI_str_utf8_from_unicode

Besides helping to avoid buffer overflow errors this reduces complexity
of BLI_str_utf32_as_utf8 which needed a special loop for the last 6
characters to avoid writing past the buffer bounds.

Also add BLI_str_utf8_from_unicode_len which only returns the length.

1 files changed, 2 insertions, 2 deletions

diff --git a/source/blender/blenkernel/intern/object_dupli.cc b/source/blender/blenkernel/intern/object_dupli.cc
index 141a9a25eca..a46ac4b1175 100644
--- a/source/blender/blenkernel/intern/object_dupli.cc
+++ b/source/blender/blenkernel/intern/object_dupli.cc
@@ -653,10 +653,10 @@ static Object *find_family_object(
     return *ob_pt;
   }
 
-  char ch_utf8[7];
+  char ch_utf8[BLI_UTF8_MAX + 1];
   size_t ch_utf8_len;
 
-  ch_utf8_len = BLI_str_utf8_from_unicode(ch, ch_utf8);
+  ch_utf8_len = BLI_str_utf8_from_unicode(ch, ch_utf8, sizeof(ch_utf8) - 1);
   ch_utf8[ch_utf8_len] = '\0';
   ch_utf8_len += 1; /* Compare with null terminator. */