Make codeq.codePointCount() resilient to erraneous parameters.

1 files changed, 13 insertions, 1 deletions

diff --git a/js/codeq.js b/js/codeq.js
index e6a8a90..0ff78b2 100644
--- a/js/codeq.js
+++ b/js/codeq.js
@@ -716,8 +716,20 @@ window.phandler = null; // TODO: this is for debug only
      */
     codeq.codePointCount = function (s) {
         var n = 0, i, code;
+        if (typeof s !== 'string') {
+            code = 'codePointCount(): argument not a string: type = ' + typeof s + ', is null = ' + (s === null);
+            if ((typeof s === 'object') && (s !== null) && s.constructor) code += ', constructor = ' + s.constructor.name;
+            codeq.log.error(code);
+            return 0;
+        }
         for (i = s.length - 1; i >= 0; i--) {
-            code = s.charCodeAt(i);
+            try {
+                code = s.charCodeAt(i);
+            }
+            catch (e) {
+                codeq.log.error('Invocation of charCodeAt() failed at iteration #' + i + ': ' + e, e);
+                return 0;
+            }
             if ((code >= 0xd800) && (code < 0xe000)) i++;
             n++;
         }