1 files changed, 131 insertions, 0 deletions

diff --git a/src/env/env.c b/src/env/env.c
new file mode 100644
index 000000000..c977572ab
--- /dev/null
+++ b/src/env/env.c
@@ -0,0 +1,131 @@
+/*
+ * This file is part of GNUnet.
+ * (C) 2013 Christian Grothoff (and other contributing authors)
+ *
+ * GNUnet 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, or (at your
+ * option) any later version.
+ *
+ * GNUnet 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 GNUnet; see the file COPYING.  If not, write to the
+ * Free Software Foundation, Inc., 59 Temple Place - Suite 330,
+ * Boston, MA 02111-1307, USA.
+ */
+
+/** 
+ * @file env/env.c
+ * @brief Library providing operations for the @e environment of
+ *        PSYC and Social messages, and for (de)serializing variable values.
+ * @author Gabor X Toth
+ */
+
+#include "platform.h"
+#include "gnunet_util_lib.h"
+#include "gnunet_env_lib.h"
+
+/** 
+ * Environment for a message.
+ *
+ * Contains modifiers.
+ */
+struct GNUNET_ENV_Environment
+{
+  struct GNUNET_ENV_Modifier *mod_head;
+  struct GNUNET_ENV_Modifier *mod_tail;
+  size_t mod_count;
+};
+
+
+/** 
+ * Create an environment.
+ * 
+ * @return A newly allocated environment.
+ */
+struct GNUNET_ENV_Environment *
+GNUNET_ENV_environment_create ()
+{
+  return GNUNET_new (struct GNUNET_ENV_Environment);
+}
+
+
+/** 
+ * Add a modifier to the environment.
+ *
+ * @param env The environment.
+ * @param oper Operation to perform.
+ * @param name Name of the variable.
+ * @param value Value of the variable.
+ * @param value_size Size of @a value.
+ */
+void
+GNUNET_ENV_environment_add_mod (struct GNUNET_ENV_Environment *env,
+                                enum GNUNET_ENV_Operator oper, const char *name,
+                                const void *value, size_t value_size)
+{
+  struct GNUNET_ENV_Modifier *mod = GNUNET_malloc (sizeof (*mod));
+  mod->oper = oper;
+  mod->name = name;
+  mod->value = value;
+  mod->value_size = value_size;
+  GNUNET_CONTAINER_DLL_insert_tail (env->mod_head, env->mod_tail, mod);
+  env->mod_count++;
+}
+
+
+/** 
+ * Iterate through all modifiers in the environment.
+ *
+ * @param env The environment.
+ * @param it Iterator.
+ * @param it_cls Closure for iterator.
+ */
+void
+GNUNET_ENV_environment_iterate (const struct GNUNET_ENV_Environment *env,
+                                GNUNET_ENV_Iterator it, void *it_cls)
+{
+  struct GNUNET_ENV_Modifier *mod;
+  for (mod = env->mod_head; NULL != mod; mod = mod->next)
+    it (it_cls, mod);
+}
+
+
+/** 
+ * Get the number of modifiers in the environment.
+ *
+ * @param env The environment.
+ *
+ * @return Number of modifiers.
+ */
+size_t
+GNUNET_ENV_environment_get_mod_count (const struct GNUNET_ENV_Environment *env)
+{
+  return env->mod_count;
+}
+
+
+/** 
+ * Destroy an environment.
+ *
+ * @param env The environment to destroy.
+ */
+void
+GNUNET_ENV_environment_destroy (struct GNUNET_ENV_Environment *env)
+{
+  struct GNUNET_ENV_Modifier *mod, *prev = NULL;
+  for (mod = env->mod_head; NULL != mod; mod = mod->next)
+  {
+    if (NULL != prev)
+      GNUNET_free (prev);
+    prev = mod;
+  }
+  if (NULL != prev)
+    GNUNET_free (prev);
+
+  GNUNET_free (env);
+}