libc/src/stdio/gpu/ungetc.cpp

   1 //===-- Implementation of ungetc ------------------------------------------===//
   2 //
   3 // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
   4 // See https://llvm.org/LICENSE.txt for license information.
   5 // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
   6 //
   7 //===----------------------------------------------------------------------===//
   8
   9 #include "src/stdio/ungetc.h"
  10 #include "file.h"
  11
  12 #include <stdio.h>
  13
  14 namespace LIBC_NAMESPACE {
  15
  16 LLVM_LIBC_FUNCTION(int, ungetc, (int c, ::FILE *stream)) {
  17   int ret;
  18   rpc::Client::Port port = rpc::client.open<RPC_UNGETC>();
  19   port.send_and_recv(
  20       [=](rpc::Buffer *buffer) {
  21         buffer->data[0] = c;
  22         buffer->data[1] = file::from_stream(stream);
  23       },
  24       [&](rpc::Buffer *buffer) { ret = static_cast<int>(buffer->data[0]); });
  25   port.close();
  26   return ret;
  27 }
  28
  29 } // namespace LIBC_NAMESPACE