1 files changed, 104 insertions, 0 deletions
diff --git a/misc/tst-makedev.c b/misc/tst-makedev.c
new file mode 100644
index 0000000000..0a38060cd1
--- /dev/null
+++ b/misc/tst-makedev.c
@@ -0,0 +1,104 @@
+/* Tests of functions to access `dev_t' values.
+   Copyright (C) 2016-2018 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 <sys/types.h>
+#include <sys/sysmacros.h>
+#include <stdio.h>
+#include <inttypes.h>
+
+/* Confirm that makedev (major (d), minor (d)) == d.  */
+static int
+do_test_split_combine (dev_t d1)
+{
+  unsigned int maj = major (d1);
+  unsigned int min = minor (d1);
+  dev_t d2 = makedev (maj, min);
+  if (d1 != d2)
+    {
+      printf ("FAIL: %016" PRIx64 " != %016" PRIx64 " (maj %08x min %08x)\n",
+	      (uint64_t)d2, (uint64_t)d1, maj, min);
+      return 1;
+    }
+  else
+    return 0;
+}
+
+/* Confirm that major (makedev (maj, min)) == maj and
+   minor (makedev (maj, min)) == min.  */
+static int
+do_test_combine_split (unsigned int maj1, unsigned int min1)
+{
+  dev_t d = makedev (maj1, min1);
+  unsigned int maj2 = major (d);
+  unsigned int min2 = minor (d);
+  if (maj1 != maj2 && min1 != min2)
+    {
+      printf ("FAIL: %08x != %08x, %08x != %08x (dev %016" PRIx64 ")\n",
+	      maj2, maj1, min2, min1, (uint64_t)d);
+      return 1;
+    }
+  else if (maj1 != maj2)
+    {
+      printf ("FAIL: %08x != %08x, %08x == %08x (dev %016" PRIx64 ")\n",
+	      maj2, maj1, min2, min1, (uint64_t)d);
+      return 1;
+    }
+  else if (min1 != min2)
+    {
+      printf ("FAIL: %08x == %08x, %08x != %08x (dev %016" PRIx64 ")\n",
+	      maj2, maj1, min2, min1, (uint64_t)d);
+      return 1;
+    }
+  else
+    return 0;
+}
+
+static int
+do_test (void)
+{
+  dev_t d;
+  unsigned int maj, min;
+  int status = 0;
+
+  /* Test the traditional range (16-bit dev_t, 8-bit each maj/min)
+     exhaustively.  */
+  for (d = 0; d <= 0xFFFF; d++)
+    status |= do_test_split_combine (d);
+
+  for (maj = 0; maj <= 0xFF; maj++)
+    for (min = 0; min <= 0xFF; min++)
+      status |= do_test_combine_split (maj, min);
+
+  /* Test glibc's expanded range (64-bit dev_t, 32-bit each maj/min).
+     Exhaustive testing would take much too long, instead we shift a
+     pair of 1-bits over each range.  */
+  {
+    unsigned int a, b;
+    for (a = 0; a <= 63; a++)
+      do_test_split_combine (((dev_t) 0x03) << a);
+
+    for (a = 0; a < 31; a++)
+      for (b = 0; b <= 31; b++)
+	do_test_combine_split (0x03u << a, 0x03u << b);
+  }
+
+  return status;
+}
+
+#define TEST_FUNCTION do_test ()
+#include "../test-skeleton.c"