1 files changed, 51 insertions, 0 deletions
diff --git a/stdio-common/tst-scanf-round.c b/stdio-common/tst-scanf-round.c
new file mode 100644
index 0000000000..a2fb620abf
--- /dev/null
+++ b/stdio-common/tst-scanf-round.c
@@ -0,0 +1,51 @@
+/* Test for correct rounding of negative floating-point numbers by scanf
+   (bug 23280).
+   Copyright (C) 2018 Free Software Foundation, Inc.
+   This file is part of the GNU C Library.
+
+   The GNU C Library is free software; you can redistribute it and/or
+   modify it under the terms of the GNU Lesser General Public
+   License as published by the Free Software Foundation; either
+   version 2.1 of the License, or (at your option) any later version.
+
+   The GNU C Library is distributed in the hope that it will be useful,
+   but WITHOUT ANY WARRANTY; without even the implied warranty of
+   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+   Lesser General Public License for more details.
+
+   You should have received a copy of the GNU Lesser General Public
+   License along with the GNU C Library; if not, see
+   <http://www.gnu.org/licenses/>.  */
+
+#include <fenv.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <support/check.h>
+
+static int
+do_test (void)
+{
+#ifdef FE_DOWNWARD
+  if (fesetround (FE_DOWNWARD) == 0)
+    {
+      double a = strtod ("-0.1", NULL);
+      double b = 0;
+      int r = sscanf ("-0.1", "%lf", &b);
+      TEST_VERIFY (r == 1);
+      TEST_VERIFY (a == b);
+    }
+#endif
+#ifdef FE_UPWARD
+  if (fesetround (FE_UPWARD) == 0)
+    {
+      double a = strtod ("-0.1", NULL);
+      double b = 0;
+      int r = sscanf ("-0.1", "%lf", &b);
+      TEST_VERIFY (r == 1);
+      TEST_VERIFY (a == b);
+    }
+#endif
+  return 0;
+}
+
+#include <support/test-driver.c>