further fix for #1407

src/library.js

@@ -1642,6 +1642,7 @@ LibraryManager.library = {
               next = get();
               {{{ makeSetValue('argPtr++', 0, 'next', 'i8') }}};
             }
+            if (next === 0) return fields-1; // we failed to read this field
             formatIndex += nextC - formatIndex + 1;
             continue;
           }

tests/core/test_sscanf_6.in

@@ -11,4 +11,18 @@ int main() {
   i = sscanf(date, "%d.%d.%3c", &d, &m, c);
   printf("date: %s; day %2d, month %2d, year %4d, extra: %s, %d\n", date, d, m,
          y, c, i);
+
+  {
+    char *date = "18.07.2013", c;
+    int y, m, d, i;
+    if ((i = sscanf(date, "%d.%d.%4d%c", &d, &m, &y, &c)) == 3)
+    {
+        printf("date: %s; day %2d, month %2d, year %4d \n", date, d, m, y);
+    }
+    else
+    {
+        printf("Error in sscanf: actually parsed %d", i);
+    }
+  }
 }
+

tests/core/test_sscanf_6.out

@@ -1,2 +1,3 @@
 date: 18.07.2013w; day 18, month  7, year 2013, extra: w, 4
 date: 18.07.2013w; day 18, month  7, year 2013, extra: 201, 3
+date: 18.07.2013; day 18, month  7, year 2013 

tests/test_core.py

@@ -3853,7 +3853,6 @@ Pass: 0.000012 0.000012''')
   def test_sscanf_6(self):
     test_path = path_from_root('tests', 'core', 'test_sscanf_6')
     src, output = (test_path + s for s in ('.in', '.out'))
-
     self.do_run_from_file(src, output)
 
   def test_sscanf_skip(self):