[libc-commits] [clang] [libc] [libc] Support opaque FILE* on baremetal (PR #168931)

[Alexander Richardson via libc-commits]

================
@@ -0,0 +1,32 @@
+//===-- Implementation of fputc for baremetal -------------------*- C++ -*-===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+
+#include "src/stdio/fputc.h"
+
+#include "hdr/stdio_macros.h" // for EOF
+#include "hdr/types/FILE.h"
+#include "src/__support/common.h"
+#include "src/__support/libc_errno.h"
+#include "src/__support/macros/config.h"
+#include "src/stdio/baremetal/file_internal.h"
+
+namespace LIBC_NAMESPACE_DECL {
+
+LLVM_LIBC_FUNCTION(int, fputc, (int c, ::FILE *stream)) {
+  auto result = write_internal(reinterpret_cast<char *>(&c), 1, stream);
----------------
arichardson wrote:

This won't work on big-endian systems, have to convert to char explicitly and then take a pointer to that. Otherwise you are passing the MSB instead of LSB.

https://github.com/llvm/llvm-project/pull/168931