libc/src/stdio/generic/fgetc_unlocked.cpp

//===-- Implementation of fgetc_unlocked ----------------------------------===//
//
// 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/fgetc_unlocked.h"
#include "src/__support/File/file.h"

#include "src/errno/libc_errno.h"
#include <stdio.h>

namespace LIBC_NAMESPACE {

LLVM_LIBC_FUNCTION(int, fgetc_unlocked, (::FILE * stream)) {
  unsigned char c;
  auto result =
      reinterpret_cast<LIBC_NAMESPACE::File *>(stream)->read_unlocked(&c, 1);
  size_t r = result.value;
  if (result.has_error())
    libc_errno = result.error;
  if (r != 1)
    return EOF;
  return c;
}

} // namespace LIBC_NAMESPACE