Fix chunk_set_cstr with suffix of current string

It's possible that cmark_chunk_set_cstr is called with a substring
(suffix) of the current string. Delay freeing of the chunk content
to handle this case correctly.

Fixes issue #139.

1 files changed, 7 insertions, 1 deletions

diff --git a/api_test/main.c b/api_test/main.c
index 8da9ba9..94051e9 100644
--- a/api_test/main.c
+++ b/api_test/main.c
@@ -171,7 +171,13 @@ static void accessors(test_batch_runner *runner) {
   OK(runner, cmark_node_set_url(link, "URL"), "set_url");
   OK(runner, cmark_node_set_title(link, "TITLE"), "set_title");
 
-  OK(runner, cmark_node_set_literal(string, "LINK"), "set_literal string");
+  OK(runner, cmark_node_set_literal(string, "prefix-LINK"),
+     "set_literal string");
+
+  // Set literal to suffix of itself (issue #139).
+  const char *literal = cmark_node_get_literal(string);
+  OK(runner, cmark_node_set_literal(string, literal + sizeof("prefix")),
+     "set_literal suffix");
 
   char *rendered_html = cmark_render_html(doc, CMARK_OPT_DEFAULT);
   static const char expected_html[] =