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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@120776 91177308-0d34-0410-b5e6-96231b3b80d8
333 lines
11 KiB
C++
333 lines
11 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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#include <WinCrypt.h>
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#include <io.h>
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using namespace llvm;
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namespace {
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error_code UTF8ToUTF16(const StringRef &utf8,
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SmallVectorImpl<wchar_t> &utf16) {
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int len = ::MultiByteToWideChar(CP_UTF8, MB_ERR_INVALID_CHARS,
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utf8.begin(), utf8.size(),
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utf16.begin(), 0);
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if (len == 0)
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return make_error_code(windows_error(::GetLastError()));
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utf16.reserve(len + 1);
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utf16.set_size(len);
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len = ::MultiByteToWideChar(CP_UTF8, MB_ERR_INVALID_CHARS,
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utf8.begin(), utf8.size(),
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utf16.begin(), utf16.size());
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if (len == 0)
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return make_error_code(windows_error(::GetLastError()));
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// Make utf16 null terminated.
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utf16.push_back(0);
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utf16.pop_back();
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return make_error_code(errc::success);
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}
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error_code UTF16ToUTF8(const wchar_t *utf16, size_t utf16_len,
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SmallVectorImpl<char> &utf8) {
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// Get length.
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int len = ::WideCharToMultiByte(CP_UTF8, NULL,
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utf16, utf16_len,
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utf8.begin(), 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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utf8.reserve(len);
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utf8.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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utf16, utf16_len,
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utf8.data(), utf8.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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// Make utf8 null terminated.
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utf8.push_back(0);
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utf8.pop_back();
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return make_error_code(errc::success);
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}
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error_code TempDir(SmallVectorImpl<wchar_t> &result) {
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retry_temp_dir:
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DWORD len = ::GetTempPathW(result.capacity(), result.begin());
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if (len == 0)
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return make_error_code(windows_error(::GetLastError()));
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if (len > result.capacity()) {
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result.reserve(len);
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goto retry_temp_dir;
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}
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result.set_size(len);
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return make_error_code(errc::success);
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}
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struct AutoCryptoProvider {
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HCRYPTPROV CryptoProvider;
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~AutoCryptoProvider() {
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::CryptReleaseContext(CryptoProvider, 0);
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}
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operator HCRYPTPROV() const {return CryptoProvider;}
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};
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}
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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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namespace fs {
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error_code copy_file(const Twine &from, const Twine &to, copy_option copt) {
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// Get arguments.
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SmallString<128> from_storage;
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SmallString<128> to_storage;
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StringRef f = from.toNullTerminatedStringRef(from_storage);
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StringRef t = to.toNullTerminatedStringRef(to_storage);
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// Convert to utf-16.
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SmallVector<wchar_t, 128> wide_from;
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SmallVector<wchar_t, 128> wide_to;
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if (error_code ec = UTF8ToUTF16(f, wide_from)) return ec;
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if (error_code ec = UTF8ToUTF16(t, wide_to)) return ec;
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// Copy the file.
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BOOL res = ::CopyFileW(wide_from.begin(), wide_to.begin(),
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copt != copy_option::overwrite_if_exists);
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if (res == 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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error_code exists(const Twine &path, bool &result) {
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SmallString<128> path_storage;
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SmallVector<wchar_t, 128> path_utf16;
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if (error_code ec = UTF8ToUTF16(path.toStringRef(path_storage),
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path_utf16))
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return ec;
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DWORD attributes = ::GetFileAttributesW(path_utf16.begin());
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if (attributes == INVALID_FILE_ATTRIBUTES) {
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// See if the file didn't actually exist.
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error_code ec = make_error_code(windows_error(::GetLastError()));
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if (ec != error_code(windows_error::file_not_found) &&
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ec != error_code(windows_error::path_not_found))
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return ec;
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result = false;
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} else
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result = true;
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return make_error_code(errc::success);
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}
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error_code unique_file(const Twine &model, int &result_fd,
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SmallVectorImpl<char> &result_path) {
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// Use result_path as temp storage.
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result_path.set_size(0);
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StringRef m = model.toStringRef(result_path);
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SmallVector<wchar_t, 128> model_utf16;
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if (error_code ec = UTF8ToUTF16(m, model_utf16)) return ec;
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// Make model absolute by prepending a temp directory if it's not already.
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bool absolute;
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if (error_code ec = path::is_absolute(m, absolute)) return ec;
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if (!absolute) {
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SmallVector<wchar_t, 64> temp_dir;
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if (error_code ec = TempDir(temp_dir)) return ec;
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// Handle c: by removing it.
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if (model_utf16.size() > 2 && model_utf16[1] == L':') {
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model_utf16.erase(model_utf16.begin(), model_utf16.begin() + 2);
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}
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model_utf16.insert(model_utf16.begin(), temp_dir.begin(), temp_dir.end());
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}
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// Replace '%' with random chars. From here on, DO NOT modify model. It may be
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// needed if the randomly chosen path already exists.
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SmallVector<wchar_t, 128> random_path_utf16;
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// Get a Crypto Provider for CryptGenRandom.
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AutoCryptoProvider CryptoProvider;
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BOOL success = ::CryptAcquireContextW(&CryptoProvider.CryptoProvider,
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NULL,
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NULL,
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PROV_RSA_FULL,
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NULL);
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if (!success)
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return make_error_code(windows_error(::GetLastError()));
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retry_random_path:
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random_path_utf16.set_size(0);
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for (SmallVectorImpl<wchar_t>::const_iterator i = model_utf16.begin(),
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e = model_utf16.end();
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i != e; ++i) {
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if (*i == L'%') {
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BYTE val = 0;
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if (!::CryptGenRandom(CryptoProvider, 1, &val))
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return make_error_code(windows_error(::GetLastError()));
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random_path_utf16.push_back("0123456789abcdef"[val & 15]);
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}
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else
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random_path_utf16.push_back(*i);
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}
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// Make random_path_utf16 null terminated.
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random_path_utf16.push_back(0);
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random_path_utf16.pop_back();
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// Try to create + open the path.
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retry_create_file:
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HANDLE TempFileHandle = ::CreateFileW(random_path_utf16.begin(),
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GENERIC_READ | GENERIC_WRITE,
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FILE_SHARE_READ,
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NULL,
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// Return ERROR_FILE_EXISTS if the file
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// already exists.
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CREATE_NEW,
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FILE_ATTRIBUTE_TEMPORARY,
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NULL);
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if (TempFileHandle == INVALID_HANDLE_VALUE) {
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// If the file existed, try again, otherwise, error.
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error_code ec = make_error_code(windows_error(::GetLastError()));
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if (ec == error_code(windows_error::file_exists))
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goto retry_random_path;
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// Check for non-existing parent directories.
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if (ec == error_code(windows_error::path_not_found)) {
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// Create the directories using result_path as temp storage.
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if (error_code ec = UTF16ToUTF8(random_path_utf16.begin(),
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random_path_utf16.size(), result_path))
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return ec;
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StringRef p(result_path.begin(), result_path.size());
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SmallString<64> dir_to_create;
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for (path::const_iterator i = path::begin(p),
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e = --path::end(p); i != e; ++i) {
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if (error_code ec = path::append(dir_to_create, *i)) return ec;
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bool Exists;
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if (error_code ec = exists(Twine(dir_to_create), Exists)) return ec;
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if (!Exists) {
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// If c: doesn't exist, bail.
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if (i->endswith(":"))
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return ec;
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SmallVector<wchar_t, 64> dir_to_create_utf16;
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if (error_code ec = UTF8ToUTF16(dir_to_create, dir_to_create_utf16))
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return ec;
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// Create the directory.
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if (!::CreateDirectoryW(dir_to_create_utf16.begin(), NULL))
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return make_error_code(windows_error(::GetLastError()));
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}
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}
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goto retry_create_file;
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}
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return ec;
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}
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// Set result_path to the utf-8 representation of the path.
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if (error_code ec = UTF16ToUTF8(random_path_utf16.begin(),
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random_path_utf16.size(), result_path)) {
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::CloseHandle(TempFileHandle);
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::DeleteFileW(random_path_utf16.begin());
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return ec;
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}
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// Convert the Windows API file handle into a C-runtime handle.
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int fd = ::_open_osfhandle(intptr_t(TempFileHandle), 0);
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if (fd == -1) {
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::CloseHandle(TempFileHandle);
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::DeleteFileW(random_path_utf16.begin());
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// MSDN doesn't say anything about _open_osfhandle setting errno or
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// GetLastError(), so just return invalid_handle.
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return make_error_code(windows_error::invalid_handle);
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}
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result_fd = fd;
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return make_error_code(errc::success);
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}
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} // end namespace fs
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} // end namespace sys
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} // end namespace llvm
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