Add new _dbus_get_environment call

It's a wrapper around the environ external variable.
It will be important in the future when we allow
bus clients to modify the environment of future
activated clients. Presently, we just always use the
bus daemon environment wholesale.

dbus/dbus-sysdeps.c

@@ -200,6 +200,48 @@ _dbus_clearenv (void)
   return rc;
 }
 
+/**
+ * Gets a #NULL-terminated list of key=value pairs from the
+ * environment. Use dbus_free_string_array to free it.
+ *
+ * @returns the environment or #NULL on OOM
+ */
+char **
+_dbus_get_environment (void)
+{
+  int i, length;
+  extern char **environ;
+  char **environment;
+
+  _dbus_assert (environ != NULL);
+
+  for (length = 0; environ[length] != NULL; length++);
+
+  /* Add one for NULL */
+  length++;
+
+  environment = dbus_new0 (char *, length);
+
+  if (environment == NULL)
+    return NULL;
+
+  for (i = 0; environ[i] != NULL; i++)
+    {
+      environment[i] = _dbus_strdup (environ[i]);
+
+      if (environment[i] == NULL)
+        break;
+    }
+
+  if (environ[i] != NULL)
+    {
+      dbus_free_string_array (environment);
+      environment = NULL;
+    }
+
+  return environment;
+}
+
 /*
  * init a pipe instance.
  *

dbus/dbus-sysdeps.h

@@ -101,6 +101,7 @@ const char* _dbus_getenv (const char *varname);
 dbus_bool_t _dbus_setenv (const char *varname,
 			  const char *value);
 dbus_bool_t _dbus_clearenv (void);
+char **     _dbus_get_environment (void);
 
 /** A process ID */
 typedef unsigned long dbus_pid_t;