util.h
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/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/* vim: set ts=2 et sw=2 tw=80: */
/* This Source Code Form is subject to the terms of the Mozilla Public
* License, v. 2.0. If a copy of the MPL was not distributed with this file,
* You can obtain one at http://mozilla.org/MPL/2.0/. */
#ifndef util_h__
#define util_h__
#include <cassert>
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#include <cstdlib>
#include <iomanip>
#include <iostream>
#include <sstream>
#include <sys/stat.h>
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#include <vector>
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#if defined(_WIN32)
#include <windows.h>
#include <codecvt>
#include <direct.h>
#else
#include <unistd.h>
#endif
#include "nspr.h"
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static inline std::vector<uint8_t> hex_string_to_bytes(std::string s) {
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std::vector<uint8_t> bytes;
for (size_t i = 0; i < s.length(); i += 2) {
bytes.push_back(std::stoul(s.substr(i, 2), nullptr, 16));
}
return bytes;
}
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// Given a prefix, attempts to create a unique directory that the user can do
// work in without impacting other tests. For example, if given the prefix
// "scratch", a directory like "scratch05c17b25" will be created in the current
// working directory (or the location specified by NSS_GTEST_WORKDIR, if
// defined).
// Upon destruction, the implementation will attempt to delete the directory.
// However, no attempt is made to first remove files in the directory - the
// user is responsible for this. If the directory is not empty, deleting it will
// fail.
// Statistically, it is technically possible to fail to create a unique
// directory name, but this is extremely unlikely given the expected workload of
// this implementation.
class ScopedUniqueDirectory {
public:
explicit ScopedUniqueDirectory(const std::string &prefix) {
std::string path;
const char *workingDirectory = PR_GetEnvSecure("NSS_GTEST_WORKDIR");
if (workingDirectory) {
path.assign(workingDirectory);
}
path.append(prefix);
for (int i = 0; i < RETRY_LIMIT; i++) {
std::string pathCopy(path);
// TryMakingDirectory will modify its input. If it fails, we want to throw
// away the modified result.
if (TryMakingDirectory(pathCopy)) {
mPath.assign(pathCopy);
break;
}
}
assert(mPath.length() > 0);
#if defined(_WIN32)
// sqldb always uses UTF-8 regardless of the current system locale.
DWORD len =
MultiByteToWideChar(CP_ACP, 0, mPath.data(), mPath.size(), nullptr, 0);
std::vector<wchar_t> buf(len, L'\0');
MultiByteToWideChar(CP_ACP, 0, mPath.data(), mPath.size(), buf.data(),
buf.size());
std::wstring_convert<std::codecvt_utf8_utf16<wchar_t>> converter;
mUTF8Path = converter.to_bytes(std::wstring(buf.begin(), buf.end()));
#else
mUTF8Path = mPath;
#endif
}
// NB: the directory must be empty upon destruction
~ScopedUniqueDirectory() { assert(rmdir(mPath.c_str()) == 0); }
const std::string &GetPath() { return mPath; }
const std::string &GetUTF8Path() { return mUTF8Path; }
private:
static const int RETRY_LIMIT = 5;
static void GenerateRandomName(/*in/out*/ std::string &prefix) {
std::stringstream ss;
ss << prefix;
// RAND_MAX is at least 32767.
ss << std::setfill('0') << std::setw(4) << std::hex << rand() << rand();
// This will overwrite the value of prefix. This is a little inefficient,
// but at least it makes the code simple.
ss >> prefix;
}
static bool TryMakingDirectory(/*in/out*/ std::string &prefix) {
GenerateRandomName(prefix);
#if defined(_WIN32)
return _mkdir(prefix.c_str()) == 0;
#else
return mkdir(prefix.c_str(), 0777) == 0;
#endif
}
std::string mPath;
std::string mUTF8Path;
};
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#endif // util_h__