libc/src/stdio/generic/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 "hdr/types/FILE.h"
  13 #include "src/__support/macros/config.h"
  14 #include "src/errno/libc_errno.h"
  15
  16 namespace LIBC_NAMESPACE_DECL {
  17
  18 LLVM_LIBC_FUNCTION(int, getchar_unlocked, ()) {
  19   unsigned char c;
  20   auto result = stdin->read_unlocked(&c, 1);
  21   if (result.has_error())
  22     libc_errno = result.error;
  23
  24   if (result.value != 1)
  25     return EOF;
  26   return c;
  27 }
  28
  29 } // namespace LIBC_NAMESPACE_DECL