libc/src/stdio/fread_unlocked.cpp

   1 //===-- Implementation of fread_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/fread_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(size_t, fread_unlocked,
  18                    (void *__restrict buffer, size_t size, size_t nmemb,
  19                     ::FILE *stream)) {
  20   if (size == 0 || nmemb == 0)
  21     return 0;
  22   auto result = reinterpret_cast<__llvm_libc::File *>(stream)->read_unlocked(
  23       buffer, size * nmemb);
  24   if (result.has_error())
  25     libc_errno = result.error;
  26   return result.value / size;
  27 }
  28
  29 } // namespace __llvm_libc