1*71db0c75SAndroid Build Coastguard Worker //===-- Implementation of ftell -------------------------------------------===// 2*71db0c75SAndroid Build Coastguard Worker // 3*71db0c75SAndroid Build Coastguard Worker // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions. 4*71db0c75SAndroid Build Coastguard Worker // See https://llvm.org/LICENSE.txt for license information. 5*71db0c75SAndroid Build Coastguard Worker // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception 6*71db0c75SAndroid Build Coastguard Worker // 7*71db0c75SAndroid Build Coastguard Worker //===----------------------------------------------------------------------===// 8*71db0c75SAndroid Build Coastguard Worker 9*71db0c75SAndroid Build Coastguard Worker #include "src/stdio/ftell.h" 10*71db0c75SAndroid Build Coastguard Worker #include "src/__support/File/file.h" 11*71db0c75SAndroid Build Coastguard Worker 12*71db0c75SAndroid Build Coastguard Worker #include "src/__support/macros/config.h" 13*71db0c75SAndroid Build Coastguard Worker #include "src/errno/libc_errno.h" 14*71db0c75SAndroid Build Coastguard Worker 15*71db0c75SAndroid Build Coastguard Worker namespace LIBC_NAMESPACE_DECL { 16*71db0c75SAndroid Build Coastguard Worker 17*71db0c75SAndroid Build Coastguard Worker LLVM_LIBC_FUNCTION(long, ftell, (::FILE * stream)) { 18*71db0c75SAndroid Build Coastguard Worker auto result = reinterpret_cast<LIBC_NAMESPACE::File *>(stream)->tell(); 19*71db0c75SAndroid Build Coastguard Worker if (!result.has_value()) { 20*71db0c75SAndroid Build Coastguard Worker libc_errno = result.error(); 21*71db0c75SAndroid Build Coastguard Worker return -1; 22*71db0c75SAndroid Build Coastguard Worker } 23*71db0c75SAndroid Build Coastguard Worker // tell() returns an off_t (64-bit signed integer), but this function returns 24*71db0c75SAndroid Build Coastguard Worker // a long (32-bit signed integer in 32-bit systems). We add a cast here to 25*71db0c75SAndroid Build Coastguard Worker // silence a "implicit conversion loses integer precision" warning when 26*71db0c75SAndroid Build Coastguard Worker // compiling for 32-bit systems. 27*71db0c75SAndroid Build Coastguard Worker return static_cast<long>(result.value()); 28*71db0c75SAndroid Build Coastguard Worker } 29*71db0c75SAndroid Build Coastguard Worker 30*71db0c75SAndroid Build Coastguard Worker } // namespace LIBC_NAMESPACE_DECL 31