2 files changed, 68 insertions, 0 deletions
diff --git a/gnulib b/gnulib
deleted file mode 160000
-Subproject 443bc5ffcf7429e557f4a371b0661abe98ddbc1
diff --git a/gnulib/tests/test-ffs.c b/gnulib/tests/test-ffs.c
new file mode 100644
index 0000000..fb37f20
--- /dev/null
+++ b/gnulib/tests/test-ffs.c
@@ -0,0 +1,68 @@
+/*
+ * Copyright (C) 2011 Free Software Foundation, Inc.
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program 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 General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.  */
+
+/* Written by Eric Blake.  */
+#include <config.h>
+
+#include <strings.h>
+
+#include "signature.h"
+SIGNATURE_CHECK (ffs, int, (int));
+
+#include <limits.h>
+
+#include "macros.h"
+
+#define NBITS (sizeof (int) * CHAR_BIT)
+
+static int
+naive (int i)
+{
+  unsigned int j;
+  for (j = 0; j < NBITS; j++)
+    if (i & (1U << j))
+      return j + 1;
+  return 0;
+}
+
+int
+main (int argc, char *argv[])
+{
+  int x;
+  int i;
+
+  for (x = -128; x <= 128; x++)
+    ASSERT (ffs (x) == naive (x));
+  for (i = 0; i < NBITS; i++)
+    {
+      ASSERT (ffs (1U << i) == naive (1U << i));
+      ASSERT (ffs (1U << i) == i + 1);
+      ASSERT (ffs (-1U << i) == i + 1);
+    }
+  for (i = 0; i < NBITS - 1; i++)
+    {
+      ASSERT (ffs (3U << i) == i + 1);
+      ASSERT (ffs (-3U << i) == i + 1);
+    }
+  for (i = 0; i < NBITS - 2; i++)
+    {
+      ASSERT (ffs (5U << i) == i + 1);
+      ASSERT (ffs (-5U << i) == i + 1);
+      ASSERT (ffs (7U << i) == i + 1);
+      ASSERT (ffs (-7U << i) == i + 1);
+    }
+  return 0;
+}