2011-07-15 Yufeng Zhang <yufeng.zhang@arm.com>

* libc/stdio/vfwprintf.c (wcvt): Add a new parameter len of type
        int.  *length is set to the value of (rev - digits) regardless
        of whether _MB_CAPABLE is defined or not.  Replace BUF with len
        in calling _mbsnrtowcs_r and also in the loop where _MB_CAPABLE
        is not defined.
        (_VFWPRINTF_R): Call wcvt with an extra argument.  Call wcvt
        again with allocated new buffer if buf is not large enough for
        the conversion.
        * testsuite/newlib.stdio/stdio.exp: New.
        * testsuite/newlib.stdio/swprintf.c: Likewise.

newlib/testsuite/newlib.stdio/stdio.exp

@@ -0,0 +1,12 @@
+# Copyright (C) 2011 by ARM Ltd. All rights reserved.
+#
+# Permission to use, copy, modify, and distribute this software
+# is freely granted, provided that this notice is preserved.
+#
+
+load_lib passfail.exp
+
+set exclude_list {
+}
+
+newlib_pass_fail_all -x $exclude_list

newlib/testsuite/newlib.stdio/swprintf.c

@@ -0,0 +1,30 @@
+/*
+ * Copyright (C) 2011 by ARM Ltd. All rights reserved.
+ *
+ * Permission to use, copy, modify, and distribute this software
+ * is freely granted, provided that this notice is preserved.
+ */
+
+#include <stdio.h>
+#include <newlib.h>
+#include <stdlib.h>
+#include <wchar.h>
+#include "check.h"
+
+int main()
+{
+#if defined(INTEGER_ONLY) || defined(NO_FLOATING_POINT)
+
+#else
+  char cbuf[512];
+  wchar_t wcbuf[512], wcbuf2[512];
+  double val = 1E+308;
+  snprintf(cbuf, 512, "%.*f", 3, val);
+  swprintf(wcbuf, 512, L"%.*f", 3, val);
+  mbstowcs(wcbuf2, cbuf, 512);
+
+  CHECK (wcscmp(wcbuf, wcbuf2) == 0);
+#endif
+
+  exit (0);
+}