| /* environ.c -- library for manipulating environments for GNU. |
| |
| Copyright (C) 1986-2024 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 "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; |
| |
| this->clear (); |
| |
| 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; |
| } |