Imported Upstream version 1.8.1p2

[debian/sudo] / common / zero_bytes.c

diff --git a/common/zero_bytes.c b/common/zero_bytes.c
new file mode 100644 (file)
index 0000000..f6f22bc
--- /dev/null
+++ b/common/zero_bytes.c
@@ -0,0 +1,36 @@
+/*
+ * Copyright (c) 2003-2005, 2007, 2010
+ *     Todd C. Miller <Todd.Miller@courtesan.com>
+ *
+ * Permission to use, copy, modify, and distribute this software for any
+ * purpose with or without fee is hereby granted, provided that the above
+ * copyright notice and this permission notice appear in all copies.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
+ * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
+ * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
+ * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
+ * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
+ * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
+ * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
+ */
+
+#include <config.h>
+
+#include <sys/types.h>
+
+#include "missing.h"
+
+/*
+ * Like bzero(3) but with a volatile pointer.  The hope is that
+ * the compiler will not be able to optimize away this function.
+ */
+void
+zero_bytes(volatile void *v, size_t n)
+{
+    volatile char *p, *ep;
+
+    for (p = v, ep = p + n; p < ep; p++)
+       *p = 0;
+    return;
+}