Libc-997.1.1.tar.gz

[apple/libc.git] / secure / memccpy_chk.c

diff --git a/secure/memccpy_chk.c b/secure/memccpy_chk.c
new file mode 100644 (file)
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--- /dev/null
+++ b/secure/memccpy_chk.c
@@ -0,0 +1,48 @@
+/*
+ * Copyright (c) 2012-2013 Apple Inc. All rights reserved.
+ *
+ * @APPLE_LICENSE_HEADER_START@
+ *
+ * This file contains Original Code and/or Modifications of Original Code
+ * as defined in and that are subject to the Apple Public Source License
+ * Version 2.0 (the 'License'). You may not use this file except in
+ * compliance with the License. Please obtain a copy of the License at
+ * http://www.opensource.apple.com/apsl/ and read it before using this
+ * file.
+ *
+ * The Original Code and all software distributed under the License are
+ * distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER
+ * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
+ * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT.
+ * Please see the License for the specific language governing rights and
+ * limitations under the License.
+ *
+ * @APPLE_LICENSE_HEADER_END@
+ */
+
+#include <stdlib.h>
+#include <string.h>
+#include "secure.h"
+
+void *
+__memccpy_chk (void *dest, const void *src, int c, size_t len, size_t dstlen)
+{
+  void *retval;
+
+  if (__builtin_expect (dstlen < len, 0))
+    __chk_fail_overflow ();
+
+  /* retval is NULL if len was copied, otherwise retval is the
+   * byte *after* the last one written.
+   */
+  retval = memccpy (dest, src, c, len);
+
+  if (retval != NULL) {
+    len = (uintptr_t)retval - (uintptr_t)dest;
+  }
+
+  __chk_overlap(dest, len, src, len);
+
+  return retval;
+}