libc/src/stdio/ftell.cpp

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