C++ string_t::c_str方法代码示例

/**
 * When the framework is not found, display detailed error message
 *   about available frameworks and installation of new framework.
 */
void handle_missing_framework_error(const pal::string_t& fx_name, const pal::string_t& fx_version, const pal::string_t& fx_dir)
{
    pal::string_t fx_ver_dirs = get_directory(fx_dir);

    // Display the error message about missing FX.
    trace::error(_X("The specified framework '%s', version '%s' was not found."), fx_name.c_str(), fx_version.c_str());
    trace::error(_X("  - Check application dependencies and target a framework version installed at:"));
    trace::error(_X("      %s"), fx_ver_dirs.c_str());

    // Gather the list of versions installed at the shared FX location.
    bool is_print_header = true;
    std::vector<pal::string_t> versions;
    pal::readdir(fx_ver_dirs, &versions);
    for (const auto& ver : versions)
    {
        // Make sure we filter out any non-version folders at shared FX location.
        fx_ver_t parsed(-1, -1, -1);
        if (fx_ver_t::parse(ver, &parsed, false))
        {
            // Print banner only once before printing the versions
            if (is_print_header)
            {
                trace::error(_X("  - The following versions are installed:"));
                is_print_header = false;
            }
            trace::error(_X("      %s"), ver.c_str());
        }
    }
    trace::error(_X("  - Alternatively, install the framework version '%s'."), fx_version.c_str());
}

bool starts_with(const pal::string_t& value, const pal::string_t& prefix, bool match_case)
{
    if (prefix.empty())
    {
        // Cannot start with an empty string.
        return false;
    }
    auto cmp = match_case ? pal::strncmp : pal::strncasecmp;
    return (value.size() >= prefix.size()) &&
        cmp(value.c_str(), prefix.c_str(), prefix.size()) == 0;
}

bool pal::touch_file(const pal::string_t& path)
{
    int fd = open(path.c_str(), (O_CREAT | O_EXCL), (S_IRUSR | S_IRGRP | S_IROTH));
    if (fd == -1)
    {
        trace::warning(_X("open(%s) failed in %s"), path.c_str(), _STRINGIFY(__FUNCTION__));
        return false;
    }
    (void) close(fd);
    return true;
}

bool pal::pal_utf8string(const pal::string_t& str, std::vector<char>* out)
{
    out->clear();

    // Pass -1 as we want explicit null termination in the char buffer.
    size_t size = ::WideCharToMultiByte(CP_UTF8, 0, str.c_str(), -1, nullptr, 0, nullptr, nullptr);
    if (size == 0)
    {
        return false;
    }
    out->resize(size, '\0');
    return ::WideCharToMultiByte(CP_UTF8, 0, str.c_str(), -1, out->data(), out->size(), nullptr, nullptr) != 0;
}

/**
 * Resolve the hostpolicy version from deps.
 *  - Scan the deps file's libraries section and find the hostpolicy version in the file.
 */
pal::string_t resolve_hostpolicy_version_from_deps(const pal::string_t& deps_json)
{
    trace::verbose(_X("--- Resolving %s version from deps json [%s]"), LIBHOSTPOLICY_NAME, deps_json.c_str());

    pal::string_t retval;
    if (!pal::file_exists(deps_json))
    {
        trace::verbose(_X("Dependency manifest [%s] does not exist"), deps_json.c_str());
        return retval;
    }

    pal::ifstream_t file(deps_json);
    if (!file.good())
    {
        trace::verbose(_X("Dependency manifest [%s] could not be opened"), deps_json.c_str());
        return retval;
    }

    if (skip_utf8_bom(&file))
    {
        trace::verbose(_X("UTF-8 BOM skipped while reading [%s]"), deps_json.c_str());
    }

    try
    {
        const auto root = json_value::parse(file);
        const auto& json = root.as_object();
        const auto& libraries = json.at(_X("libraries")).as_object();

        // Look up the root package instead of the "runtime" package because we can't do a full rid resolution.
        // i.e., look for "Microsoft.NETCore.DotNetHostPolicy/" followed by version.
        pal::string_t prefix = _X("Microsoft.NETCore.DotNetHostPolicy/");
        for (const auto& library : libraries)
        {
            if (starts_with(library.first, prefix, false))
            {
                // Extract the version information that occurs after '/'
                retval = library.first.substr(prefix.size());
                break;
            }
        }
    }
    catch (const std::exception& je)
    {
        pal::string_t jes;
        (void)pal::utf8_palstring(je.what(), &jes);
        trace::error(_X("A JSON parsing exception occurred in [%s]: %s"), deps_json.c_str(), jes.c_str());
    }
    trace::verbose(_X("Resolved version %s from dependency manifest file [%s]"), retval.c_str(), deps_json.c_str());
    return retval;
}

int execute_app(
    const pal::string_t& impl_dll_dir,
    const corehost_init_t* init,
    const int argc,
    const pal::char_t* argv[])
{
    pal::dll_t corehost;
    corehost_main_fn host_main = nullptr;
    corehost_load_fn host_load = nullptr;
    corehost_unload_fn host_unload = nullptr;

    int code = load_host_library(impl_dll_dir, &corehost, &host_load, &host_main, &host_unload);

    if (code != StatusCode::Success)
    {
        trace::error(_X("Could not load host policy library [%s]"), impl_dll_dir.c_str());
        return code;
    }

    if ((code = host_load(init)) == 0)
    {
        code = host_main(argc, argv);
        (void)host_unload();
    }

    pal::unload_library(corehost);

    return code;
}

int load_host_library_common(
    const pal::string_t& lib_dir,
    pal::string_t& host_path,
    pal::dll_t* h_host,
    corehost_load_fn* load_fn,
    corehost_unload_fn* unload_fn)
{
    if (!library_exists_in_dir(lib_dir, LIBHOSTPOLICY_NAME, &host_path))
    {
        return StatusCode::CoreHostLibMissingFailure;
    }

    // Load library
    if (!pal::load_library(&host_path, h_host))
    {
        trace::info(_X("Load library of %s failed"), host_path.c_str());
        return StatusCode::CoreHostLibLoadFailure;
    }

    // Obtain entrypoint symbols
    *load_fn = (corehost_load_fn)pal::get_symbol(*h_host, "corehost_load");
    *unload_fn = (corehost_unload_fn)pal::get_symbol(*h_host, "corehost_unload");

    return (*load_fn != nullptr) && (*unload_fn != nullptr)
        ? StatusCode::Success
        : StatusCode::CoreHostEntryPointFailure;
}

/**
 * Given a directory and a version, find if the package relative
 *     dir under the given directory contains hostpolicy.dll
 */
bool to_hostpolicy_package_dir(const pal::string_t& dir, const pal::string_t& version, pal::string_t* candidate)
{
    assert(!version.empty());

    candidate->clear();

    // Ensure the relative dir contains platform directory separators.
    pal::string_t rel_dir = _STRINGIFY(HOST_POLICY_PKG_REL_DIR);
    if (DIR_SEPARATOR != '/')
    {
        replace_char(&rel_dir, '/', DIR_SEPARATOR);
    }

    // Construct the path to directory containing hostpolicy.
    pal::string_t path = dir;
    append_path(&path, _STRINGIFY(HOST_POLICY_PKG_NAME)); // package name
    append_path(&path, version.c_str());                  // package version
    append_path(&path, rel_dir.c_str());                  // relative dir containing hostpolicy library

    // Check if "path" contains the required library.
    if (!library_exists_in_dir(path, LIBHOSTPOLICY_NAME, nullptr))
    {
        trace::verbose(_X("Did not find %s in directory %s"), LIBHOSTPOLICY_NAME, path.c_str());
        return false;
    }

    // "path" contains the directory containing hostpolicy library.
    *candidate = path;

    trace::verbose(_X("Found %s in directory %s"), LIBHOSTPOLICY_NAME, path.c_str());
    return true;
}

// -----------------------------------------------------------------------------
// Load local assemblies by priority order of their file extensions and
// unique-fied  by their simple name.
//
void deps_resolver_t::get_dir_assemblies(
    const pal::string_t& dir,
    const pal::string_t& dir_name,
    dir_assemblies_t* dir_assemblies)
{
    trace::verbose(_X("Adding files from %s dir %s"), dir_name.c_str(), dir.c_str());

    // Managed extensions in priority order, pick DLL over EXE and NI over IL.
    const pal::string_t managed_ext[] = { _X(".ni.dll"), _X(".dll"), _X(".ni.exe"), _X(".exe") };

    // List of files in the dir
    std::vector<pal::string_t> files;
    pal::readdir(dir, &files);

    for (const auto& ext : managed_ext)
    {
        for (const auto& file : files)
        {
            // Nothing to do if file length is smaller than expected ext.
            if (file.length() <= ext.length())
            {
                continue;
            }

            auto file_name = file.substr(0, file.length() - ext.length());
            auto file_ext = file.substr(file_name.length());

            // Ext did not match expected ext, skip this file.
            if (pal::strcasecmp(file_ext.c_str(), ext.c_str()))
            {
                continue;
            }

            // Already added entry for this asset, by priority order skip this ext
            if (dir_assemblies->count(file_name))
            {
                trace::verbose(_X("Skipping %s because the %s already exists in %s assemblies"), file.c_str(), dir_assemblies->find(file_name)->second.c_str(), dir_name.c_str());
                continue;
            }

            // Add entry for this asset
            pal::string_t file_path = dir + DIR_SEPARATOR + file;
            trace::verbose(_X("Adding %s to %s assembly set from %s"), file_name.c_str(), dir_name.c_str(), file_path.c_str());
            dir_assemblies->emplace(file_name, file_path);
        }
    }
}

runtime_config_t::runtime_config_t(const pal::string_t& path)
    : m_fx_roll_fwd(true)
    , m_path(path)
    , m_portable(false)
{
    m_valid = ensure_parsed();
    trace::verbose(_X("Runtime config [%s] is valid=[%d]"), path.c_str(), m_valid);
} 

bool get_global_shared_store_dirs(std::vector<pal::string_t>*  dirs, const pal::string_t& arch, const pal::string_t& tfm)
{
    std::vector<pal::string_t> global_dirs;
    if (!pal::get_global_dotnet_dirs(&global_dirs))
    {
        return false;
    }

    for (pal::string_t dir : global_dirs)
    {
        append_path(&dir, RUNTIME_STORE_DIRECTORY_NAME);
        append_path(&dir, arch.c_str());
        append_path(&dir, tfm.c_str());
        dirs->push_back(dir);
    }
    return true;
}

// -----------------------------------------------------------------------------
// Load the deps file and parse its "entry" lines which contain the "fields" of
// the entry. Populate an array of these entries.
//
bool deps_json_t::load(bool portable, const pal::string_t& deps_path, const rid_fallback_graph_t& rid_fallback_graph)
{
    m_file_exists = pal::file_exists(deps_path);

    // If file doesn't exist, then assume parsed.
    if (!m_file_exists)
    {
        trace::verbose(_X("Could not locate the dependencies manifest file [%s]. Some libraries may fail to resolve."), deps_path.c_str());
        return true;
    }

    // Somehow the file stream could not be opened. This is an error.
    pal::ifstream_t file(deps_path);
    if (!file.good())
    {
        trace::error(_X("Could not open dependencies manifest file [%s]"), deps_path.c_str());
        return false;
    }

    if (skip_utf8_bom(&file))
    {
        trace::verbose(_X("UTF-8 BOM skipped while reading [%s]"), deps_path.c_str());
    }

    try
    {
        const auto json = json_value::parse(file);

        const auto& runtime_target = json.at(_X("runtimeTarget"));

        const pal::string_t& name = runtime_target.is_string()?
            runtime_target.as_string():
            runtime_target.at(_X("name")).as_string();

        trace::verbose(_X("Loading deps file... %s as portable=[%d]"), deps_path.c_str(), portable);

        return (portable) ? load_portable(json, name, rid_fallback_graph) : load_standalone(json, name);
    }
    catch (const std::exception& je)
    {
        pal::string_t jes;
        (void) pal::utf8_palstring(je.what(), &jes);
        trace::error(_X("A JSON parsing exception occurred in [%s]: %s"), deps_path.c_str(), jes.c_str());
        return false;
    }
}

bool pal::file_exists(const pal::string_t& path)
{
    if (path.empty())
    {
        return false;
    }
    struct stat buffer;
    return (::stat(path.c_str(), &buffer) == 0);
}

pal::string_t resolve_sdk_version(pal::string_t sdk_path)
{
    trace::verbose(_X("--- Resolving SDK version from SDK dir [%s]"), sdk_path.c_str());

    pal::string_t retval;
    std::vector<pal::string_t> versions;

    pal::readdir(sdk_path, &versions);
    fx_ver_t max_ver(-1, -1, -1);
    fx_ver_t max_pre(-1, -1, -1);
    for (const auto& version : versions)
    {
        trace::verbose(_X("Considering version... [%s]"), version.c_str());

        fx_ver_t ver(-1, -1, -1);
        if (fx_ver_t::parse(version, &ver, true))
        {
            max_ver = std::max(ver, max_ver);
        }
        if (fx_ver_t::parse(version, &ver, false))
        {
            max_pre = std::max(ver, max_pre);
        }
    }

    // No production, use the max pre-release.
    if (max_ver == fx_ver_t(-1, -1, -1))
    {
        trace::verbose(_X("No production version found, so using latest prerelease"));
        max_ver = max_pre;
    }

    pal::string_t max_ver_str = max_ver.as_str();
    append_path(&sdk_path, max_ver_str.c_str());

    trace::verbose(_X("Checking if resolved SDK dir [%s] exists"), sdk_path.c_str());
    if (pal::directory_exists(sdk_path))
    {
        retval = sdk_path;
    }

    trace::verbose(_X("Resolved SDK dir is [%s]"), retval.c_str());
    return retval;
}

void tpafile::add_from_local_dir(const pal::string_t& dir)
{
	trace::verbose(_X("adding files from %s to TPA"), dir.c_str());
	const pal::char_t * const tpa_extensions[] = {
		_X(".ni.dll"),      // Probe for .ni.dll first so that it's preferred if ni and il coexist in the same dir
		_X(".dll"),
		_X(".ni.exe"),
		_X(".exe"),
	};

	std::set<pal::string_t> added_assemblies;

	// Get directory entries
	auto files = pal::readdir(dir);
	for (auto ext : tpa_extensions)
	{
		auto len = pal::strlen(ext);
		for (auto file : files)
		{
			// Can't be a match if it's the same length as the extension :)
			if (file.length() > len)
			{
				// Extract the same amount of text from the end of file name
				auto file_ext = file.substr(file.length() - len, len);

				// Check if this file name matches
				if (pal::strcasecmp(ext, file_ext.c_str()) == 0)
				{
					// Get the assembly name by stripping the extension
					// and add it to the set so we can de-dupe
					auto asm_name = file.substr(0, file.length() - len);

					// TODO(anurse): Also check if already in TPA file
					if (added_assemblies.find(asm_name) == added_assemblies.end())
					{
						added_assemblies.insert(asm_name);

						tpaentry_t entry;
						entry.asset_type = pal::string_t(_X("runtime"));
						entry.library_name = pal::string_t(asm_name);
						entry.library_version = pal::string_t(_X(""));

						pal::string_t relpath(dir);
						relpath.push_back(DIR_SEPARATOR);
						relpath.append(file);
						entry.relative_path = relpath;
						entry.asset_name = asm_name;

						trace::verbose(_X("adding %s to TPA list from %s"), asm_name.c_str(), relpath.c_str());
						m_entries.push_back(entry);
					}
				}
			}
		}
	}
}