common: add knot_memdup() function

Knot.files

@@ -63,6 +63,7 @@ src/common/lists.c
 src/common/lists.h
 src/common/log.c
 src/common/log.h
+src/common/memdup.h
 src/common/mempattern.c
 src/common/mempattern.h
 src/common/mempool.c

src/Makefile.am

@@ -181,6 +181,7 @@ libknots_la_SOURCES =				\
 	common/libtap/tap.h			\
 	common/libtap/tap_unit.h		\
 	common/atomic.h				\
+	common/memdup.h				\
 	common/mempattern.h			\
 	common/mempattern.c			\
 	common/descriptor.h			\

src/common/memdup.h

+/*  Copyright (C) 2011 CZ.NIC, z.s.p.o. <knot-dns@labs.nic.cz>
+ *
+ *  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 KNOT_COMMON_MEMDUP
+#define KNOT_COMMON_MEMDUP
+
+#include <stdint.h>
+#include <stdlib.h>
+#include <string.h>
+
+uint8_t *knot_memdup(const uint8_t *data, size_t data_size)
+{
+	uint8_t *result = (uint8_t *)malloc(data_size);
+	if (!result)
+		return NULL;
+
+	return memcpy(result, data, data_size);
+}
+
+#endif // KNOT_COMMON_MEMDUP