libc/src/stdio/generic/fread.cpp

   1 //===-- Implementation of fread -------------------------------------------===//
   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.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 #include <stddef.h>
  16
  17 namespace LIBC_NAMESPACE_DECL {
  18
  19 LLVM_LIBC_FUNCTION(size_t, fread,
  20                    (void *__restrict buffer, size_t size, size_t nmemb,
  21                     ::FILE *stream)) {
  22   if (size == 0 || nmemb == 0)
  23     return 0;
  24   auto result = reinterpret_cast<LIBC_NAMESPACE::File *>(stream)->read(
  25       buffer, size * nmemb);
  26   if (result.has_error())
  27     libc_errno = result.error;
  28   return result.value / size;
  29 }
  30
  31 } // namespace LIBC_NAMESPACE_DECL