X-Git-Url: https://git.danieliu.xyz/?a=blobdiff_plain;f=src%2Fparser.c;h=5b08be407b6999c0986a4599473c4521753235ef;hb=8a77ead5006867bb2572d80072645178fc74dbe4;hp=9721bd4dd63c585862c4e6926762f53cfd2099c9;hpb=707f128bcec13b4efab5b534ec108f09dbe3f6c2;p=smdp.git

diff --git a/src/parser.c b/src/parser.c
index 9721bd4..5b08be4 100644
--- a/src/parser.c
+++ b/src/parser.c
@@ -174,21 +174,25 @@ deck_t *markdown_load(FILE *input) {
         deck->header = line;
 
         // find first non-header line
-        while(line->text->size > 0 && line->text->text[0] == '%') {
+        while(line && line->text->size > 0 && line->text->text[0] == '%') {
             hc++;
             line = line->next;
         }
 
-        // split linked list
-        line->prev->next = NULL;
-        line->prev = NULL;
+        // only split header if any non-header line is found
+        if(line) {
 
-        // remove header lines from slide
-        deck->slide->line = line;
+            // split linked list
+            line->prev->next = NULL;
+            line->prev = NULL;
 
-        // adjust counts
-        deck->headers += hc;
-        deck->slide->lines -= hc;
+            // remove header lines from slide
+            deck->slide->line = line;
+
+            // adjust counts
+            deck->headers += hc;
+            deck->slide->lines -= hc;
+        }
     }
 
     slide = deck->slide;