libc/src/stdio/getc_unlocked.cpp

   1 //===-- Implementation of getc_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/getc_unlocked.h"
  10 #include "src/__support/File/file.h"
  11
  12 #include <errno.h>
  13 #include <stdio.h>
  14
  15 namespace __llvm_libc {
  16
  17 LLVM_LIBC_FUNCTION(int, getc_unlocked, (::FILE * stream)) {
  18   unsigned char c;
  19   auto result =
  20       reinterpret_cast<__llvm_libc::File *>(stream)->read_unlocked(&c, 1);
  21   size_t r = result.value;
  22   if (result.has_error())
  23     errno = result.error;
  24
  25   if (r != 1)
  26     return EOF;
  27   return c;
  28 }
  29
  30 } // namespace __llvm_libc