basic: add a Bitmap implementation

For when a Hashmap is overkill.

1 files changed, 50 insertions, 0 deletions

diff --git a/src/basic/bitmap.h b/src/basic/bitmap.h
new file mode 100644
index 0000000000..92bee51a2c
--- /dev/null
+++ b/src/basic/bitmap.h
@@ -0,0 +1,50 @@
+/*-*- Mode: C; c-basic-offset: 8; indent-tabs-mode: nil -*-*/
+
+#pragma once
+
+/***
+  This file is part of systemd.
+
+  Copyright 2015 Tom Gundersen
+
+  systemd 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.
+
+  systemd 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 systemd; If not, see <http://www.gnu.org/licenses/>.
+***/
+
+#include "macro.h"
+
+typedef struct Bitmap Bitmap;
+
+Bitmap *bitmap_new(void);
+
+void bitmap_free(Bitmap *b);
+
+int bitmap_ensure_allocated(Bitmap **b);
+
+int bitmap_set(Bitmap *b, unsigned n);
+void bitmap_unset(Bitmap *b, unsigned n);
+bool bitmap_isset(Bitmap *b, unsigned n);
+bool bitmap_isclear(Bitmap *b);
+void bitmap_clear(Bitmap *b);
+
+void bitmap_rewind(Bitmap *b);
+bool bitmap_next(Bitmap *b, unsigned *n);
+
+bool bitmap_equal(Bitmap *a, Bitmap *b);
+
+#define BITMAP_FOREACH(n, b) \
+        for (bitmap_rewind(b); bitmap_next((b), &(n)); )
+
+DEFINE_TRIVIAL_CLEANUP_FUNC(Bitmap*, bitmap_free);
+
+#define _cleanup_bitmap_free_ _cleanup_(bitmap_freep)