libc/src/stdio/fseek.cpp

   1 //===-- Implementation of fseek -------------------------------------------===//
   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/fseek.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, fseek, (::FILE * stream, long offset, int whence)) {
  18   auto result =
  19       reinterpret_cast<__llvm_libc::File *>(stream)->seek(offset, whence);
  20   if (!result.has_value()) {
  21     errno = result.error();
  22     return -1;
  23   }
  24   return 0;
  25 }
  26
  27 } // namespace __llvm_libc