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https://github.com/c64scene-ar/llvm-6502.git
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dffde99644
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@120329 91177308-0d34-0410-b5e6-96231b3b80d8
72 lines
2.4 KiB
C++
72 lines
2.4 KiB
C++
//===- llvm/Support/Win32/PathV2.cpp - Windows Path Impl --------*- C++ -*-===//
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//
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// The LLVM Compiler Infrastructure
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//
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// This file is distributed under the University of Illinois Open Source
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// License. See LICENSE.TXT for details.
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//
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//===----------------------------------------------------------------------===//
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//
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// This file implements the Windows specific implementation of the PathV2 API.
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//
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//===----------------------------------------------------------------------===//
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//===----------------------------------------------------------------------===//
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//=== WARNING: Implementation here must contain only generic Windows code that
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//=== is guaranteed to work on *all* Windows variants.
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//===----------------------------------------------------------------------===//
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#include "Windows.h"
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namespace llvm {
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namespace sys {
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namespace path {
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error_code current_path(SmallVectorImpl<char> &result) {
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SmallVector<wchar_t, 128> cur_path;
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cur_path.reserve(128);
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retry_cur_dir:
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DWORD len = ::GetCurrentDirectoryW(cur_path.capacity(), cur_path.data());
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// A zero return value indicates a failure other than insufficient space.
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if (len == 0)
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return make_error_code(windows_error(::GetLastError()));
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// If there's insufficient space, the len returned is larger than the len
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// given.
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if (len > cur_path.capacity()) {
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cur_path.reserve(len);
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goto retry_cur_dir;
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}
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cur_path.set_size(len);
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// cur_path now holds the current directory in utf-16. Convert to utf-8.
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// Find out how much space we need. Sadly, this function doesn't return the
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// size needed unless you tell it the result size is 0, which means you
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// _always_ have to call it twice.
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len = ::WideCharToMultiByte(CP_UTF8, NULL,
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cur_path.data(), cur_path.size(),
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result.data(), 0,
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NULL, NULL);
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if (len == 0)
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return make_error_code(windows_error(::GetLastError()));
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result.reserve(len);
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result.set_size(len);
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// Now do the actual conversion.
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len = ::WideCharToMultiByte(CP_UTF8, NULL,
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cur_path.data(), cur_path.size(),
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result.data(), result.size(),
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NULL, NULL);
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if (len == 0)
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return make_error_code(windows_error(::GetLastError()));
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return make_error_code(errc::success);
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}
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} // end namespace path
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} // end namespace sys
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} // end namespace llvm
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