- char *new_docs = xasprintf ("%s%s", m_docs, d_docs);
- dict_set_documents (m, new_docs);
- free (new_docs);
+ struct string_array new_docs;
+ size_t i;
+
+ new_docs.n = m_docs->n + d_docs->n;
+ new_docs.strings = xmalloc (new_docs.n * sizeof *new_docs.strings);
+ for (i = 0; i < m_docs->n; i++)
+ new_docs.strings[i] = m_docs->strings[i];
+ for (i = 0; i < d_docs->n; i++)
+ new_docs.strings[m_docs->n + i] = d_docs->strings[i];
+
+ dict_set_documents (m, &new_docs);
+
+ free (new_docs.strings);