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// Copyright 2016 The Bazel Authors. All rights reserved.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
#ifndef BAZEL_SRC_MAIN_NATIVE_WINDOWS_UTIL_H__
#define BAZEL_SRC_MAIN_NATIVE_WINDOWS_UTIL_H__
#include <windows.h>
#include <string>
namespace bazel {
namespace windows {
using std::wstring;
// A wrapper for the `HANDLE` type that calls CloseHandle in its d'tor.
// WARNING: do not use for HANDLE returned by FindFirstFile; those must be
// closed with FindClose (otherwise they aren't closed properly).
struct AutoHandle {
AutoHandle(HANDLE _handle = INVALID_HANDLE_VALUE) : handle_(_handle) {}
~AutoHandle() {
::CloseHandle(handle_); // succeeds if handle == INVALID_HANDLE_VALUE
handle_ = INVALID_HANDLE_VALUE;
}
bool IsValid() { return handle_ != INVALID_HANDLE_VALUE && handle_ != NULL; }
AutoHandle& operator=(const HANDLE& rhs) {
if (IsValid()) {
::CloseHandle(handle_);
}
handle_ = rhs;
return *this;
}
operator HANDLE() const { return handle_; }
private:
HANDLE handle_;
};
struct AutoAttributeList {
AutoAttributeList(DWORD dwAttributeCount) {
SIZE_T size = 0;
InitializeProcThreadAttributeList(NULL, dwAttributeCount, 0, &size);
lpAttributeList =
reinterpret_cast<LPPROC_THREAD_ATTRIBUTE_LIST>(malloc(size));
InitializeProcThreadAttributeList(lpAttributeList, dwAttributeCount, 0,
&size);
}
~AutoAttributeList() {
if (lpAttributeList) {
DeleteProcThreadAttributeList(lpAttributeList);
free(lpAttributeList);
}
lpAttributeList = NULL;
}
operator LPPROC_THREAD_ATTRIBUTE_LIST() const { return lpAttributeList; }
private:
LPPROC_THREAD_ATTRIBUTE_LIST lpAttributeList;
};
#define WSTR1(x) L##x
#define WSTR(x) WSTR1(x)
wstring MakeErrorMessage(const wchar_t* file, int line,
const wchar_t* failed_func, const wstring& func_arg,
const wstring& message);
wstring MakeErrorMessage(const wchar_t* file, int line,
const wchar_t* failed_func, const wstring& func_arg,
DWORD error_code);
wstring GetLastErrorString(DWORD error_code);
// Same as `AsExecutablePathForCreateProcess` except it won't quote the result.
wstring AsShortPath(wstring path, wstring* result);
// Computes a path suitable as the executable part in CreateProcessA's cmdline.
//
// The null-terminated executable path for CreateProcessA has to fit into
// MAX_PATH, therefore the limit for the executable's path is MAX_PATH - 1
// (not including null terminator). This method attempts to convert the input
// `path` to a short format to fit it into the MAX_PATH - 1 limit.
//
// `path` must be either an absolute, normalized, Windows-style path with drive
// letter (e.g. "c:\foo\bar.exe", but no "\foo\bar.exe"), or must be just a file
// name (e.g. "cmd.exe") that's shorter than MAX_PATH (without null-terminator).
// In both cases, `path` must be unquoted.
//
// If this function succeeds, it returns an empty string (indicating no error),
// and sets `result` to the resulting path, which is always quoted, and is
// always at most MAX_PATH + 1 long (MAX_PATH - 1 without null terminator, plus
// two quotes). If there's any error, this function returns the error message.
//
// If `path` is at most MAX_PATH - 1 long (not including null terminator), the
// result will be that (plus quotes).
// Otherwise this method attempts to compute an 8dot3 style short name for
// `path`, and if that succeeds and the result is at most MAX_PATH - 1 long (not
// including null terminator), then that will be the result (plus quotes).
// Otherwise this function fails and returns an error message.
wstring AsExecutablePathForCreateProcess(const wstring& path, wstring* result);
} // namespace windows
} // namespace bazel
#endif // BAZEL_SRC_MAIN_NATIVE_WINDOWS_UTIL_H__
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