zircon/system/core/devmgr/devcoordinator/boot-args.h

// Copyright 2019 The Fuchsia Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.

#pragma once

#include <string_view>
#include <map>

#include <fbl/vector.h>
#include <lib/zx/vmo.h>

namespace devmgr {

// Handle boot arguments contained within a VMO.
class BootArgs {
public:
    // Create BootArgs from a |vmo| with a given |size|.
    static zx_status_t Create(zx::vmo vmo, size_t size, BootArgs* out);

    BootArgs() = default;
    ~BootArgs();

    BootArgs(const BootArgs&) = delete;
    BootArgs(BootArgs&&) = delete;
    BootArgs& operator=(const BootArgs&) = delete;
    BootArgs& operator=(BootArgs&&) = delete;

    // Get the value of boot argument |name|.
    const char* Get(std::string_view name) const;
    // Get the boolean value of boot argument |name|. If it does not exist,
    // return |default_value|.
    bool GetBool(std::string_view name, bool default_value) const;
    // Collect all boot arguments with |prefix| and add them to |out|.
    void Collect(std::string_view prefix, fbl::Vector<const char*>* out) const;

private:
    uintptr_t addr_ = 0;
    size_t size_ = 0;
    // TODO(TC-383): This should be std::unordered_map.
    using ArgsMap = std::map<std::string_view, const char*>;
    ArgsMap args_;
};

} // namespace devmgr