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authorAndrew Tridgell <tridge@samba.org>2010-02-13 12:53:15 +1100
committerAndrew Tridgell <tridge@samba.org>2010-02-13 22:36:11 +1100
commit63844609dafb58860a4058bbd7fee10b1f69876b (patch)
tree3dbc7005acf92cd72a2a323e2eda64b8d7d3831a /lib/util/tsort.h
parent6824c6f46ba7c15e8af91d5aa8b21a946b63107b (diff)
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util: added TYPESAFE_QSORT() macro
This makes it much harder to get the type of a qsort comparison function wrong.
Diffstat (limited to 'lib/util/tsort.h')
-rw-r--r--lib/util/tsort.h38
1 files changed, 38 insertions, 0 deletions
diff --git a/lib/util/tsort.h b/lib/util/tsort.h
new file mode 100644
index 0000000000..236b369912
--- /dev/null
+++ b/lib/util/tsort.h
@@ -0,0 +1,38 @@
+/*
+ Unix SMB/CIFS implementation.
+
+ typesafe qsort
+
+ Copyright (C) Andrew Tridgell 2010
+
+ 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/>.
+*/
+
+#ifndef _TSORT_H
+#define _TSORT_H
+#include <assert.h>
+
+/*
+ a wrapper around qsort() that ensures the comparison function is
+ type safe.
+ */
+#define TYPESAFE_QSORT(base, numel, comparison) \
+do { \
+ if (numel > 1) { \
+ qsort(base, numel, sizeof((base)[0]), QSORT_CAST comparison); \
+ assert(comparison(&((base)[0]), &((base)[1])) <= 0); \
+ } \
+} while (0)
+
+#endif