1 files changed, 30 insertions, 0 deletions
diff --git a/system/framework/IntegerPrintfMacros.h b/system/framework/IntegerPrintfMacros.h
new file mode 100644
index 000000000..b5ee9cd21
--- /dev/null
+++ b/system/framework/IntegerPrintfMacros.h
@@ -0,0 +1,30 @@
+/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+/* Implements the C99 <inttypes.h> interface. */
+
+#ifndef mozilla_IntegerPrintfMacros_h_
+#define mozilla_IntegerPrintfMacros_h_
+
+/*
+ * These macros should not be used with the NSPR printf-like functions or their
+ * users, e.g. mozilla/Logging.h.  If you need to use NSPR's facilities, see the
+ * comment on supported formats at the top of nsprpub/pr/include/prprf.h.
+ */
+
+/*
+ * scanf is a footgun: if the input number exceeds the bounds of the target
+ * type, behavior is undefined (in the compiler sense: that is, this code
+ * could overwrite your hard drive with zeroes):
+ *
+ *   uint8_t u;
+ *   sscanf("256", "%" SCNu8, &u); // BAD
+ *
+ * For this reason, *never* use the SCN* macros provided by this header!
+ */
+
+#include <inttypes.h>
+
+#endif  /* mozilla_IntegerPrintfMacros_h_ */