1 files changed, 40 insertions, 0 deletions
diff --git a/mfbt/Sprintf.h b/mfbt/Sprintf.h
new file mode 100644
index 0000000000..14dcbe0c1d
--- /dev/null
+++ b/mfbt/Sprintf.h
@@ -0,0 +1,40 @@
+/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* vim: set ts=8 sts=2 et sw=2 tw=80: */
+/* 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/. */
+
+/* Provides a safer sprintf for printing to fixed-size character arrays. */
+
+#ifndef mozilla_Sprintf_h_
+#define mozilla_Sprintf_h_
+
+#include <stdio.h>
+#include <stdarg.h>
+
+#include "mozilla/Assertions.h"
+#include "mozilla/Attributes.h"
+
+#ifdef __cplusplus
+
+template <size_t N>
+MOZ_FORMAT_PRINTF(2, 0)
+int VsprintfLiteral(char (&buffer)[N], const char* format, va_list args) {
+  MOZ_ASSERT(format != buffer);
+  int result = vsnprintf(buffer, N, format, args);
+  buffer[N - 1] = '\0';
+  return result;
+}
+
+template <size_t N>
+MOZ_FORMAT_PRINTF(2, 3)
+int SprintfLiteral(char (&buffer)[N], const char* format, ...) {
+  va_list args;
+  va_start(args, format);
+  int result = VsprintfLiteral(buffer, format, args);
+  va_end(args);
+  return result;
+}
+
+#endif
+#endif /* mozilla_Sprintf_h_ */