msvcrt: Add stub for _setmaxstdio + tiny test.

dlls/msvcrt/file.c

@@ -3090,6 +3090,20 @@ int CDECL _getmaxstdio(void)
 }
 
 /*********************************************************************
+ *		_setmaxstdio_ (MSVCRT.@)
+ */
+int CDECL _setmaxstdio(int newmax)
+{
+    int res;
+    if( newmax > 2048)
+      res = -1;
+    else
+      res = newmax;
+    FIXME("stub: setting new maximum for number of simultaneously open files not implemented,returning %d\n",res);
+    return res;
+}
+
+/*********************************************************************
  *		__pioinfo (MSVCRT.@)
  * FIXME: see MSVCRT_MAX_FILES define.
  */

dlls/msvcrt/msvcrt.spec

@@ -431,7 +431,7 @@
 @ cdecl _seterrormode(long)
 @ cdecl -i386 -norelay _setjmp(ptr) MSVCRT__setjmp
 @ cdecl -i386 -norelay _setjmp3(ptr long) MSVCRT__setjmp3
-@ stub _setmaxstdio #(long)
+@ cdecl _setmaxstdio(long)
 @ cdecl _setmbcp(long)
 @ cdecl _setmode(long long)
 @ stub _setsystime #(ptr long)

dlls/msvcrt/tests/file.c

@@ -788,6 +788,12 @@ static void test_get_osfhandle(void)
     _unlink(fname);
 }
 
+static void test_setmaxstdio(void)
+{
+    ok(2048 == _setmaxstdio(2048),"_setmaxstdio returned %d instead of 2048\n",_setmaxstdio(2048));
+    ok(-1 == _setmaxstdio(2049),"_setmaxstdio returned %d instead of -1\n",_setmaxstdio(2049));
+}
+
 START_TEST(file)
 {
     int arg_c;
@@ -818,4 +824,5 @@ START_TEST(file)
     test_file_put_get();
     test_tmpnam();
     test_get_osfhandle();
+    test_setmaxstdio();
 }