add patchfile for expansion memory leak

Dockerfile

@@ -7,9 +7,16 @@ RUN apt-get update && \
     apt-get install -y autoconf automake libtool pkg-config python && \
     rm -rf /var/lib/apt/lists/*
 
-# install libpostal
+# clone libpostal
 RUN git clone https://github.com/openvenues/libpostal /code/libpostal
 WORKDIR /code/libpostal
+
+# patch libpostal
+# https://github.com/pelias/interpolation/issues/132
+COPY patchfile /tmp/patchfile
+RUN git apply /tmp/patchfile
+
+# install libpostal
 RUN ./bootstrap.sh && \
     ./configure --datadir=/usr/share/libpostal && \
     make && make check && make install && \

patchfile

@@ -0,0 +1,15 @@
+diff --git a/src/transliterate.c b/src/transliterate.c
+index 7f5fff7..83e502b 100644
+--- a/src/transliterate.c
++++ b/src/transliterate.c
+@@ -938,7 +938,9 @@ char *transliterate(char *trans_name, char *str, size_t len) {
+                     if (context_no_match && !prev_state.empty_transition && prev_state.phrase_len > 0) {
+                         log_debug("Previous phrase stays as is %.*s\n", (int)prev_state.phrase_len, str+prev_state.phrase_start);
+                         char_array_cat_len(new_str, str + prev_state.phrase_start, prev_state.phrase_len);
+-                        state = start_state;
++                        if (match_candidate_state.state != TRANS_STATE_PARTIAL_MATCH) {
++                            state = start_state;
++                        }
+                     }
+
+                     if (state.state == TRANS_STATE_BEGIN && !prev_state.empty_transition) {