libc/src/stdio/setbuf.cpp

   1 //===-- Implementation of setbuf ------------------------------------------===//
   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/setbuf.h"
  10 #include "src/__support/File/file.h"
  11
  12 #include "src/errno/libc_errno.h"
  13 #include <stdio.h>
  14
  15 namespace LIBC_NAMESPACE {
  16
  17 LLVM_LIBC_FUNCTION(void, setbuf,
  18                    (::FILE *__restrict stream, char *__restrict buf)) {
  19   int mode = _IOFBF;
  20   if (buf == nullptr)
  21     mode = _IONBF;
  22   int err = reinterpret_cast<LIBC_NAMESPACE::File *>(stream)->set_buffer(
  23       buf, BUFSIZ, mode);
  24   if (err != 0)
  25     libc_errno = err;
  26 }
  27
  28 } // namespace LIBC_NAMESPACE