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//===- llvm/Support/Win32/PathV2.cpp - Windows Path Impl --------*- C++ -*-===//
//
// The LLVM Compiler Infrastructure
//
// This file is distributed under the University of Illinois Open Source
// License. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//
//
// This file implements the Windows specific implementation of the PathV2 API.
//
//===----------------------------------------------------------------------===//
//===----------------------------------------------------------------------===//
//=== WARNING: Implementation here must contain only generic Windows code that
//=== is guaranteed to work on *all* Windows variants.
//===----------------------------------------------------------------------===//
#include "Windows.h"
namespace llvm {
namespace sys {
namespace path {
error_code current_path(SmallVectorImpl<char> &result) {
SmallVector<wchar_t, 128> cur_path;
cur_path.reserve(128);
retry_cur_dir:
DWORD len = ::GetCurrentDirectoryW(cur_path.capacity(), cur_path.data());
// A zero return value indicates a failure other than insufficient space.
if (len == 0)
return make_error_code(windows_error(::GetLastError()));
// If there's insufficient space, the len returned is larger than the len
// given.
if (len > cur_path.capacity()) {
cur_path.reserve(len);
goto retry_cur_dir;
}
cur_path.set_size(len);
// cur_path now holds the current directory in utf-16. Convert to utf-8.
// Find out how much space we need. Sadly, this function doesn't return the
// size needed unless you tell it the result size is 0, which means you
// _always_ have to call it twice.
len = ::WideCharToMultiByte(CP_UTF8, NULL,
cur_path.data(), cur_path.size(),
result.data(), 0,
NULL, NULL);
if (len == 0)
return make_error_code(windows_error(::GetLastError()));
result.reserve(len);
result.set_size(len);
// Now do the actual conversion.
len = ::WideCharToMultiByte(CP_UTF8, NULL,
cur_path.data(), cur_path.size(),
result.data(), result.size(),
NULL, NULL);
if (len == 0)
return make_error_code(windows_error(::GetLastError()));
return make_error_code(errc::success);
}
} // end namespace path
} // end namespace sys
} // end namespace llvm
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