1 files changed, 27 insertions, 0 deletions
diff --git a/memory/build/FdPrintf.h b/memory/build/FdPrintf.h
new file mode 100644
index 0000000000..257084243b
--- /dev/null
+++ b/memory/build/FdPrintf.h
@@ -0,0 +1,27 @@
+/* -*- 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/. */
+
+#ifndef __FdPrintf_h__
+#define __FdPrintf_h__
+
+/* We can't use libc's (f)printf because it would reenter in replace_malloc,
+ * So use a custom and simplified version.  Only %p, %zu, %s and %% are
+ * supported, %zu, %s, support width specifiers.
+ *
+ * /!\ This function used a fixed-size internal buffer. The caller is
+ * expected to not use a format string that may overflow.
+ * The aFd argument is a file descriptor on UNIX and a native win32 file
+ * handle on Windows (from CreateFile). We can't use the windows POSIX
+ * APIs is that they don't support O_APPEND in a multi-process-safe way,
+ * while CreateFile does.
+ */
+void FdPrintf(intptr_t aFd, const char* aFormat, ...)
+#ifdef __GNUC__
+    __attribute__((format(printf, 2, 3)))
+#endif
+    ;
+
+#endif /* __FdPrintf_h__ */