// -*- C++ -*- (c) 2016 Jan Mrázek <email@honzamrazek.cz>

#ifndef __DIOS_MAIN_H__
#define __DIOS_MAIN_H__

#include <utility>

#include <dios.h>
#include <dios/sys/kernel.hpp>

namespace __dios {

/*
 * Find all sys opt string (in form sys.#) and return key-value pairs
 */
bool getSysOpts( const _VM_Env *e, SysOpts& res );

std::string_view extractOpt( std::string_view key, SysOpts& opts );
bool extractOpt( std::string_view key, std::string_view value, SysOpts& opts );

/*
 * Construct null-terminated string from env->value
 */
char *env_to_string( const _VM_Env *env ) noexcept;

/*
 * Find env key by name, nullptr if key does not exist
 */
const _VM_Env *get_env_key( const char* key, const _VM_Env *e ) noexcept;

/*
 * Construct argv/envp-like arguments from env keys beginning with prefix.
 * If prepend_name, binary name is prepended to the arguments.
 * Return (argc, argv)
 */
std::pair<int, char**> construct_main_arg( const char* prefix, const _VM_Env *env,
    bool prepend_name = false ) noexcept;

/*
 * Trace arguments constructed by construct_main_arg
 */
void trace_main_arg( int indent, std::string_view name, std::pair< int, char** > arg );

/*
 * Free argv/envp-like arguments created by construct_main_arg
 */
void free_main_arg( char** argv ) noexcept;

} // namespace __dios

#endif // __DIOS_MAIN_H__