Fix str-slice function with negative size

Fixes #2132
sass · Aug 3, 2016 · 7c7b112 · 7c7b112
1 parent 55c0858
commit 7c7b112
Showing 1 changed file with 2 additions and 1 deletion.
diff --git a/src/functions.cpp b/src/functions.cpp
@@ -1020,11 +1020,12 @@ namespace Sass {
         std::string str = unquote(s->value());
 
         size_t size = utf8::distance(str.begin(), str.end());
-        if (end_at <= size * -1.0) { end_at += size; }
+        if (end_at <= size * -1.0 && size > 1) { end_at += size; }
         if (end_at < 0) { end_at += size + 1; }
         if (end_at > size) { end_at = (double)size; }
         if (start_at < 0) { start_at += size + 1; }
         else if (start_at == 0) { ++ start_at; }
+        if (end_at == 0) end_at = 1;;
 
         if (start_at <= end_at)
         {