Fix handling of filenames that start the same as reserved filenames

on Windows. (Bug #12325)

mysql-test/include/windows.inc

+--require r/true.require
+disable_query_log;
+select convert(@@version_compile_os using latin1) IN ("Win32","Win64","Windows") as "TRUE";
+enable_query_log;

mysql-test/r/lowercase_table.result

@@ -83,9 +83,3 @@ create table t2 like T1;
 drop table t1, t2;
 show tables;
 Tables_in_test
-use lpt1;
-ERROR 42000: Unknown database 'lpt1'
-use com1;
-ERROR 42000: Unknown database 'com1'
-use prn;
-ERROR 42000: Unknown database 'prn'

mysql-test/r/windows.result

+use lpt1;
+ERROR 42000: Unknown database 'lpt1'
+use com1;
+ERROR 42000: Unknown database 'com1'
+use prn;
+ERROR 42000: Unknown database 'prn'
+create table nu (a int);
+drop table nu;

mysql-test/t/lowercase_table.test

@@ -83,14 +83,4 @@ drop table t1, t2;
 
 show tables;
 
-#
-#Bug 9148: Denial of service
-#
---error 1049
-use lpt1;
---error 1049
-use com1;
---error 1049
-use prn;
-
 # End of 4.1 tests

mysql-test/t/windows.test

+# Windows-specific tests
+--source include/windows.inc
+
+#
+# Bug 9148: Denial of service
+#
+--error 1049
+use lpt1;
+--error 1049
+use com1;
+--error 1049
+use prn;
+
+#
+# Bug #12325: Can't create table named 'nu'
+#
+create table nu (a int);
+drop table nu;
+
+# End of 4.1 tests

mysys/my_access.c

@@ -105,7 +105,7 @@ int check_if_legal_filename(const char *path)
     {
       if (*reserved != my_toupper(&my_charset_latin1, *name))
         break;
-      if (++name == end)
+      if (++name == end && !reserved[1])
         DBUG_RETURN(1);                         /* Found wrong path */
     } while (*++reserved);
   }