libc/src/stdio/getchar_unlocked.cpp

   1 //===-- Implementation of getchar_unlocked --------------------------------===//
   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/getchar_unlocked.h"
  10 #include "src/__support/File/file.h"
  11
  12 #include "src/errno/libc_errno.h"
  13 #include <stdio.h>
  14
  15 namespace __llvm_libc {
  16
  17 LLVM_LIBC_FUNCTION(int, getchar_unlocked, ()) {
  18   unsigned char c;
  19   auto result = stdin->read_unlocked(&c, 1);
  20   if (result.has_error())
  21     libc_errno = result.error;
  22
  23   if (result.value != 1)
  24     return EOF;
  25   return c;
  26 }
  27
  28 } // namespace __llvm_libc