Simplified strdup(); added test for it in test_strings.

src/library.js

@@ -3652,13 +3652,8 @@ LibraryManager.library = {
 
   strdup: function(ptr) {
     var len = String_len(ptr);
-    var end = ptr + len;
     var newStr = _malloc(len + 1);
-    for (var src = ptr, dst = newStr; src < end; src++, dst++) {
-      var srcVal = {{{ makeGetValue('src', 0, 'i8') }}};
-      {{{ makeSetValue('dst', 0, 'srcVal', 'i8') }}}
-    }
-    {{{ makeSetValue('dst', 0, 0, 'i8') }}}
+    {{{ makeCopyValues('newStr', 'ptr', 'len + 1', 'null', ' || 0') }}};
     return newStr;
   },
 

tests/runner.py

@@ -679,10 +679,15 @@ if 'benchmark' not in sys.argv:
             printf("%s\\n", NULL); // Should print '(null)', not the string at address 0, which is a real address for us!
             printf("/* a comment */\\n"); // Should not break the generated code!
             printf("// another\\n"); // Should not break the generated code!
+
+            char* strdup_val = strdup("test");
+            printf("%s\\n", strdup_val);
+            free(strdup_val);
+
             return 0;
           }
         '''
-        self.do_test(src, '3:10,177,543\n4\nwowie\ntoo\n76\n5\n(null)\n/* a comment */\n// another', ['wowie', 'too', '74'])
+        self.do_test(src, '3:10,177,543\n4\nwowie\ntoo\n76\n5\n(null)\n/* a comment */\n// another\ntest\n', ['wowie', 'too', '74'])
 
     def test_error(self):
         src = r'''