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/* Header for environment manipulation library.
Copyright (C) 1989-2020 Free Software Foundation, Inc.
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 3 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program. If not, see <http://www.gnu.org/licenses/>. */
#ifndef COMMON_ENVIRON_H
#define COMMON_ENVIRON_H
#include <vector>
#include <set>
/* Class that represents the environment variables as seen by the
inferior. */
class gdb_environ
{
public:
/* Regular constructor and destructor. */
gdb_environ ()
{
/* Make sure that the vector contains at least a NULL element.
If/when we add more variables to it, NULL will always be the
last element. */
m_environ_vector.push_back (NULL);
}
~gdb_environ ()
{
clear ();
}
/* Move constructor. */
gdb_environ (gdb_environ &&e)
: m_environ_vector (std::move (e.m_environ_vector)),
m_user_set_env (std::move (e.m_user_set_env)),
m_user_unset_env (std::move (e.m_user_unset_env))
{
/* Make sure that the moved-from vector is left at a valid
state (only one NULL element). */
e.m_environ_vector.clear ();
e.m_environ_vector.push_back (NULL);
e.m_user_set_env.clear ();
e.m_user_unset_env.clear ();
}
/* Move assignment. */
gdb_environ &operator= (gdb_environ &&e);
/* Create a gdb_environ object using the host's environment
variables. */
static gdb_environ from_host_environ ();
/* Clear the environment variables stored in the object. */
void clear ();
/* Return the value in the environment for the variable VAR. The
returned pointer is only valid as long as the gdb_environ object
is not modified. */
const char *get (const char *var) const;
/* Store VAR=VALUE in the environment. */
void set (const char *var, const char *value);
/* Unset VAR in environment. */
void unset (const char *var);
/* Return the environment vector represented as a 'char **'. */
char **envp () const;
/* Return the user-set environment vector. */
const std::set<std::string> &user_set_env () const;
/* Return the user-unset environment vector. */
const std::set<std::string> &user_unset_env () const;
private:
/* Unset VAR in environment. If UPDATE_UNSET_LIST is true, then
also update M_USER_UNSET_ENV to reflect the unsetting of the
environment variable. */
void unset (const char *var, bool update_unset_list);
/* A vector containing the environment variables. */
std::vector<char *> m_environ_vector;
/* The environment variables explicitly set by the user. */
std::set<std::string> m_user_set_env;
/* The environment variables explicitly unset by the user. */
std::set<std::string> m_user_unset_env;
};
#endif /* COMMON_ENVIRON_H */
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