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- /* environ.c -- library for manipulating environments for GNU.
- Copyright (C) 1986-2022 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/>. */
- #include "common-defs.h"
- #include "environ.h"
- #include <algorithm>
- #include <utility>
- /* See gdbsupport/environ.h. */
- gdb_environ &
- gdb_environ::operator= (gdb_environ &&e)
- {
- /* Are we self-moving? */
- if (&e == this)
- return *this;
- 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);
- e.m_environ_vector.clear ();
- e.m_environ_vector.push_back (NULL);
- e.m_user_set_env.clear ();
- e.m_user_unset_env.clear ();
- return *this;
- }
- /* See gdbsupport/environ.h. */
- gdb_environ gdb_environ::from_host_environ ()
- {
- extern char **environ;
- gdb_environ e;
- if (environ == NULL)
- return e;
- for (int i = 0; environ[i] != NULL; ++i)
- {
- /* Make sure we add the element before the last (NULL). */
- e.m_environ_vector.insert (e.m_environ_vector.end () - 1,
- xstrdup (environ[i]));
- }
- return e;
- }
- /* See gdbsupport/environ.h. */
- void
- gdb_environ::clear ()
- {
- for (char *v : m_environ_vector)
- xfree (v);
- m_environ_vector.clear ();
- /* Always add the NULL element. */
- m_environ_vector.push_back (NULL);
- m_user_set_env.clear ();
- m_user_unset_env.clear ();
- }
- /* Helper function to check if STRING contains an environment variable
- assignment of VAR, i.e., if STRING starts with 'VAR='. Return true
- if it contains, false otherwise. */
- static bool
- match_var_in_string (const char *string, const char *var, size_t var_len)
- {
- if (strncmp (string, var, var_len) == 0 && string[var_len] == '=')
- return true;
- return false;
- }
- /* See gdbsupport/environ.h. */
- const char *
- gdb_environ::get (const char *var) const
- {
- size_t len = strlen (var);
- for (char *el : m_environ_vector)
- if (el != NULL && match_var_in_string (el, var, len))
- return &el[len + 1];
- return NULL;
- }
- /* See gdbsupport/environ.h. */
- void
- gdb_environ::set (const char *var, const char *value)
- {
- char *fullvar = concat (var, "=", value, (char *) NULL);
- /* We have to unset the variable in the vector if it exists. */
- unset (var, false);
- /* Insert the element before the last one, which is always NULL. */
- m_environ_vector.insert (m_environ_vector.end () - 1, fullvar);
- /* Mark this environment variable as having been set by the user.
- This will be useful when we deal with setting environment
- variables on the remote target. */
- m_user_set_env.insert (std::string (fullvar));
- /* If this environment variable is marked as unset by the user, then
- remove it from the list, because now the user wants to set
- it. */
- m_user_unset_env.erase (std::string (var));
- }
- /* See gdbsupport/environ.h. */
- void
- gdb_environ::unset (const char *var, bool update_unset_list)
- {
- size_t len = strlen (var);
- std::vector<char *>::iterator it_env;
- /* We iterate until '.end () - 1' because the last element is
- always NULL. */
- for (it_env = m_environ_vector.begin ();
- it_env != m_environ_vector.end () - 1;
- ++it_env)
- if (match_var_in_string (*it_env, var, len))
- break;
- if (it_env != m_environ_vector.end () - 1)
- {
- m_user_set_env.erase (std::string (*it_env));
- xfree (*it_env);
- m_environ_vector.erase (it_env);
- }
- if (update_unset_list)
- m_user_unset_env.insert (std::string (var));
- }
- /* See gdbsupport/environ.h. */
- void
- gdb_environ::unset (const char *var)
- {
- unset (var, true);
- }
- /* See gdbsupport/environ.h. */
- char **
- gdb_environ::envp () const
- {
- return const_cast<char **> (&m_environ_vector[0]);
- }
- /* See gdbsupport/environ.h. */
- const std::set<std::string> &
- gdb_environ::user_set_env () const
- {
- return m_user_set_env;
- }
- const std::set<std::string> &
- gdb_environ::user_unset_env () const
- {
- return m_user_unset_env;
- }
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