Index: generic/nsfError.c
===================================================================
diff -u -N -rcbcfec72376d549a806859c873195cc0ebc9c9ea -rada0c34feb466ca58024f10383c1d6f96cd5a02d
--- generic/nsfError.c	(.../nsfError.c)	(revision cbcfec72376d549a806859c873195cc0ebc9c9ea)
+++ generic/nsfError.c	(.../nsfError.c)	(revision ada0c34feb466ca58024f10383c1d6f96cd5a02d)
@@ -92,7 +92,7 @@
    */
 
 #if defined(_MSC_VER)
-  failure = (result == -1 && errno == ERANGE);
+  failure = (result == -1 && errno == ERANGE) || (result == avail) /* VC 12 */;
 #else
   assert(result > -1);
   failure = (result >= avail);