104 lines
3.2 KiB
C++
104 lines
3.2 KiB
C++
/* Header for environment manipulation library.
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Copyright (C) 1989-2018 Free Software Foundation, Inc.
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This program is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 3 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program. If not, see <http://www.gnu.org/licenses/>. */
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#if !defined (ENVIRON_H)
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#define ENVIRON_H 1
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#include <vector>
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#include <set>
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/* Class that represents the environment variables as seen by the
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inferior. */
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class gdb_environ
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{
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public:
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/* Regular constructor and destructor. */
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gdb_environ ()
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{
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/* Make sure that the vector contains at least a NULL element.
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If/when we add more variables to it, NULL will always be the
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last element. */
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m_environ_vector.push_back (NULL);
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}
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~gdb_environ ()
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{
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clear ();
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}
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/* Move constructor. */
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gdb_environ (gdb_environ &&e)
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: m_environ_vector (std::move (e.m_environ_vector)),
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m_user_set_env (std::move (e.m_user_set_env)),
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m_user_unset_env (std::move (e.m_user_unset_env))
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{
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/* Make sure that the moved-from vector is left at a valid
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state (only one NULL element). */
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e.m_environ_vector.clear ();
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e.m_environ_vector.push_back (NULL);
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e.m_user_set_env.clear ();
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e.m_user_unset_env.clear ();
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}
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/* Move assignment. */
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gdb_environ &operator= (gdb_environ &&e);
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/* Create a gdb_environ object using the host's environment
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variables. */
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static gdb_environ from_host_environ ();
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/* Clear the environment variables stored in the object. */
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void clear ();
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/* Return the value in the environment for the variable VAR. The
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returned pointer is only valid as long as the gdb_environ object
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is not modified. */
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const char *get (const char *var) const;
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/* Store VAR=VALUE in the environment. */
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void set (const char *var, const char *value);
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/* Unset VAR in environment. */
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void unset (const char *var);
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/* Return the environment vector represented as a 'char **'. */
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char **envp () const;
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/* Return the user-set environment vector. */
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const std::set<std::string> &user_set_env () const;
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/* Return the user-unset environment vector. */
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const std::set<std::string> &user_unset_env () const;
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private:
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/* Unset VAR in environment. If UPDATE_UNSET_LIST is true, then
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also update M_USER_UNSET_ENV to reflect the unsetting of the
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environment variable. */
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void unset (const char *var, bool update_unset_list);
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/* A vector containing the environment variables. */
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std::vector<char *> m_environ_vector;
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/* The environment variables explicitly set by the user. */
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std::set<std::string> m_user_set_env;
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/* The environment variables explicitly unset by the user. */
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std::set<std::string> m_user_unset_env;
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};
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#endif /* defined (ENVIRON_H) */
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