1 files changed, 103 insertions, 0 deletions
diff --git a/gdbsupport/environ.h b/gdbsupport/environ.h
new file mode 100644
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+++ b/gdbsupport/environ.h
@@ -0,0 +1,103 @@
+/* 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 */