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diff --git a/src/bitmap_i.h b/src/bitmap_i.h
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+/*
+ * Copyright (c) 2013-2015 Richard Braun.
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a
+ * copy of this software and associated documentation files (the "Software"),
+ * to deal in the Software without restriction, including without limitation
+ * the rights to use, copy, modify, merge, publish, distribute, sublicense,
+ * and/or sell copies of the Software, and to permit persons to whom the
+ * Software is furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in
+ * all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
+ * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
+ * DEALINGS IN THE SOFTWARE.
+ *
+ * Upstream site with license notes :
+ * http://git.sceen.net/rbraun/librbraun.git/
+ */
+
+#ifndef _BITMAP_I_H
+#define _BITMAP_I_H
+
+#include <limits.h>
+
+#include "macros.h"
+
+#ifndef LONG_BIT
+#define LONG_BIT ((int)(CHAR_BIT * sizeof(long)))
+#endif /* LONG_BIT */
+
+#define BITMAP_LONGS(nr_bits) DIV_CEIL(nr_bits, LONG_BIT)
+
+/*
+ * Adjust the bitmap pointer and the bit index so that the latter refers
+ * to a bit inside the word pointed by the former.
+ *
+ * Implemented as a macro for const-correctness.
+ */
+#define bitmap_lookup(bmp, bitp)        \
+MACRO_BEGIN                             \
+    int i;                              \
+                                        \
+    i = BITMAP_LONGS(*(bitp) + 1) - 1;  \
+    *(bmp) += i;                        \
+    *(bitp) -= i * LONG_BIT;            \
+MACRO_END
+
+static inline unsigned long
+bitmap_mask(int bit)
+{
+    return (1UL << bit);
+}
+
+/*
+ * Return the index of the next set bit in the bitmap, starting (and
+ * including) the given bit index, or -1 if the bitmap is empty. If
+ * complement is true, bits are toggled before searching so that the
+ * result is the index of the next zero bit.
+ */
+int bitmap_find_next_bit(const unsigned long *bm, int nr_bits, int bit,
+                         int complement);
+
+#endif /* _BITMAP_I_H */