FIXED: Avoid a few potential crashes

diff --git a/Sources/libMultiMarkdown/mmd.c b/Sources/libMultiMarkdown/mmd.c
index b6a3ef3c9e7c7f26b56ca3a202a58b507a9b6951..0831a107d23c94355aedc9dbc7ccc41cff4b9033 100644 (file)
--- a/Sources/libMultiMarkdown/mmd.c
+++ b/Sources/libMultiMarkdown/mmd.c
@@ -205,6 +205,9 @@ mmd_engine * mmd_engine_create_with_string(const char * str, unsigned long exten
 
 /// Set language and smart quotes language
 void mmd_engine_set_language(mmd_engine * e, short language) {
+       if (!e)
+               return;
+
        e->language = language;
 
        switch (language) {
@@ -1940,7 +1943,9 @@ token * mmd_engine_parse_substring(mmd_engine * e, size_t byte_start, size_t byt
 
 /// Parse the entire string into a token tree
 void mmd_engine_parse_string(mmd_engine * e) {
-       e->root = mmd_engine_parse_substring(e, 0, e->dstr->currentStringLength);
+       if (e) {
+               e->root = mmd_engine_parse_substring(e, 0, e->dstr->currentStringLength);               
+       }
 }
 
 
@@ -1980,7 +1985,10 @@ bool mmd_engine_has_metadata(mmd_engine * e, size_t * end) {
                // First line is not metadata, so can't have metadata
                // Saves the time of an unnecessary parse 
                // TODO:  Need faster confirmation of actual metadata than full tokenizing
-               *end = 0;
+               if (end) {
+                       *end = 0;
+               }
+       
                return false;
        }