Allow the modification on FcTypeVoid with FcTypeLangSet and FcTypeCharSet

FcTypeVoid is likely to happen when 'lang' and 'charset'
is deleted by 'delete' or 'delete_all' mode in edit.
Without this change, any modification on them are simply
ignored.

This is useful to make a lot of changes, particularly
when one wants to add a few and delete a lot say.

1 files changed, 15 insertions, 12 deletions

diff --git a/src/fclang.c b/src/fclang.c
index 9f685f6..b1fd1bc 100644
--- a/src/fclang.c
+++ b/src/fclang.c
@@ -720,19 +720,22 @@ FcLangSetPromote (const FcChar8 *lang, FcValuePromotionBuffer *vbuf)
     memset (buf->ls.map, '\0', sizeof (buf->ls.map));
     buf->ls.map_size = NUM_LANG_SET_MAP;
     buf->ls.extra = 0;
-    id = FcLangSetIndex (lang);
-    if (id > 0)
+    if (lang)
     {
-	FcLangSetBitSet (&buf->ls, id);
-    }
-    else
-    {
-	buf->ls.extra = &buf->strs;
-	buf->strs.num = 1;
-	buf->strs.size = 1;
-	buf->strs.strs = &buf->str;
-	FcRefInit (&buf->strs.ref, 1);
-	buf->str = (FcChar8 *) lang;
+	id = FcLangSetIndex (lang);
+	if (id > 0)
+	{
+	    FcLangSetBitSet (&buf->ls, id);
+	}
+	else
+	{
+	    buf->ls.extra = &buf->strs;
+	    buf->strs.num = 1;
+	    buf->strs.size = 1;
+	    buf->strs.strs = &buf->str;
+	    FcRefInit (&buf->strs.ref, 1);
+	    buf->str = (FcChar8 *) lang;
+	}
     }
     return &buf->ls;
 }