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 "src/__support/libc_errno.h"
13#include "src/__support/macros/config.h"
14
15namespace LIBC_NAMESPACE_DECL {
16
17LLVM_LIBC_FUNCTION(long, ftell, (::FILE * stream)) {
18 auto result = reinterpret_cast<LIBC_NAMESPACE::File *>(stream)->tell();
19 if (!result.has_value()) {
20 libc_errno = result.error();
21 return -1;
22 }
23 // tell() returns an off_t (64-bit signed integer), but this function returns
24 // a long (32-bit signed integer in 32-bit systems). We add a cast here to
25 // silence a "implicit conversion loses integer precision" warning when
26 // compiling for 32-bit systems.
27 return static_cast<long>(result.value());
28}
29
30} // namespace LIBC_NAMESPACE_DECL
31

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source code of libc/src/stdio/generic/ftell.cpp