lib-fts: Add assert to make sure uni_utf8_get_char() returns valid UTF-8

The input to lib-fts is always expected to be valid UTF-8.

diff --git a/src/lib-fts/fts-filter-contractions.c b/src/lib-fts/fts-filter-contractions.c
index 67bab47f03c9e2fdb10ebc0ea697e7fff0f9a517..11afbb98b52c99b322f5cfb497e4008f77a0c399 100644 (file)
--- a/src/lib-fts/fts-filter-contractions.c
+++ b/src/lib-fts/fts-filter-contractions.c
@@ -58,6 +58,7 @@ fts_filter_contractions_filter(struct fts_filter *filter ATTR_UNUSED,
                if (token[pos] == '\0')
                        break;
                char_size = uni_utf8_get_char(token + pos, &apostrophe);
+               i_assert(char_size > 0);
                if (IS_APOSTROPHE(apostrophe)) {
                        pos += char_size;
                        *_token = token + pos;