Avoid null pointer dereference.

[simgrid.git] / src / bindings / lua / lua_host.cpp

diff --git a/src/bindings/lua/lua_host.cpp b/src/bindings/lua/lua_host.cpp
index 71484a4..7adcf77 100644 (file)
--- a/src/bindings/lua/lua_host.cpp
+++ b/src/bindings/lua/lua_host.cpp
@@ -1,29 +1,28 @@
-/* Copyright (c) 2010-2017. The SimGrid Team. All rights reserved.          */
+/* Copyright (c) 2010-2019. The SimGrid Team. All rights reserved.          */
 
 /* This program is free software; you can redistribute it and/or modify it
  * under the terms of the license (GNU LGPL) which comes with this package. */
 
 /* SimGrid Lua bindings                                                     */
 
-#include "lua_private.h"
+#include "lua_private.hpp"
 #include "simgrid/s4u/Host.hpp"
-extern "C" {
 #include <lauxlib.h>
-}
 
 XBT_LOG_NEW_DEFAULT_CATEGORY(lua_host, "Lua Host module");
 
-#define HOST_MODULE_NAME "simgrid.host"
-#define HOST_FIELDNAME   "__simgrid_host"
+constexpr char HOST_MODULE_NAME[] = "simgrid.host";
+constexpr char HOST_FIELDNAME[]   = "__simgrid_host";
+
 /* ********************************************************************************* */
 /*                                simgrid.host API                                   */
 /* ********************************************************************************* */
 
-/** @brief Ensures that the pointed stack value is an host userdatum and returns it.
+/** @brief Ensures that the pointed stack value is a host userdatum and returns it.
  *
- * \param L a Lua state
- * \param index an index in the Lua stack
- * \return the C host corresponding to this Lua host
+ * @param L a Lua state
+ * @param index an index in the Lua stack
+ * @return the C host corresponding to this Lua host
  */
 sg_host_t sglua_check_host(lua_State * L, int index)
 {
@@ -31,19 +30,18 @@ sg_host_t sglua_check_host(lua_State * L, int index)
   lua_getfield(L, index, HOST_FIELDNAME);
   sg_host_t *pi = (sg_host_t *) luaL_checkudata(L, lua_gettop(L), HOST_MODULE_NAME);
   lua_pop(L, 1);
-  if (pi == nullptr)
-    XBT_ERROR("luaL_checkudata() returned nullptr");
+  xbt_assert(pi != nullptr, "luaL_checkudata() returned nullptr");
   sg_host_t ht = *pi;
-  if (!ht)
+  if (not ht)
     luaL_error(L, "null Host");
   return ht;
 }
 
 /**
- * \brief Returns a host given its name. This is a lua function.
+ * @brief Returns a host given its name. This is a lua function.
  *
- * \param L a Lua state
- * \return number of values returned to Lua
+ * @param L a Lua state
+ * @return number of values returned to Lua
  *
  * - Argument 1 (string): name of a host
  * - Return value (host): the corresponding host will be pushed onto the stack
@@ -67,9 +65,9 @@ static int l_host_get_by_name(lua_State * L)
 }
 
 /**
- * \brief Returns the name of a host.
- * \param L a Lua state
- * \return number of values returned to Lua
+ * @brief Returns the name of a host.
+ * @param L a Lua state
+ * @return number of values returned to Lua
  *
  * - Argument 1 (host): a host
  * - Return value (string): name of this host
@@ -77,14 +75,14 @@ static int l_host_get_by_name(lua_State * L)
 static int l_host_get_name(lua_State * L)
 {
   sg_host_t ht = sglua_check_host(L, 1);
-  lua_pushstring(L, ht->cname());
+  lua_pushstring(L, ht->get_cname());
   return 1;
 }
 
 /**
- * \brief Returns the number of existing hosts.
- * \param L a Lua state
- * \return number of values returned to Lua
+ * @brief Returns the number of existing hosts.
+ * @param L a Lua state
+ * @return number of values returned to Lua
  *
  * - Return value (number): number of hosts
  */
@@ -97,9 +95,9 @@ static int l_host_number(lua_State * L)
 }
 
 /**
- * \brief Returns the host given its index.
- * \param L a Lua state
- * \return number of values returned to Lua
+ * @brief Returns the host given its index.
+ * @param L a Lua state
+ * @return number of values returned to Lua
  *
  * - Argument 1 (number): an index (1 is the first)
  * - Return value (host): the host at this index
@@ -120,9 +118,9 @@ static int l_host_at(lua_State * L)
 }
 
 /**
- * \brief Returns the value of a host property.
- * \param L a Lua state
- * \return number of values returned to Lua
+ * @brief Returns the value of a host property.
+ * @param L a Lua state
+ * @return number of values returned to Lua
  *
  * - Argument 1 (host): a host
  * - Argument 2 (string): name of the property to get
@@ -137,16 +135,16 @@ static int l_host_get_property_value(lua_State * L)
 }
 
 /**
- * \brief Destroys a host.
- * \param L a Lua state
- * \return number of values returned to Lua
+ * @brief Destroys a host.
+ * @param L a Lua state
+ * @return number of values returned to Lua
  *
  * - Argument 1 (host): the host to destroy
  */
 static int l_host_destroy(lua_State *L)
 {
-  //sg_host_t ht = sglua_check_host(L, 1);
-  //FIXME: not working..__MSG_host_priv_free(MSG_host_priv(ht));
+  sg_host_t ht = sglua_check_host(L, 1);
+  ht->destroy();
   return 0;
 }
 
@@ -163,9 +161,9 @@ static const luaL_Reg host_functions[] = {
 };
 
 /**
- * \brief Returns a string representation of a host.
- * \param L a Lua state
- * \return number of values returned to Lua
+ * @brief Returns a string representation of a host.
+ * @param L a Lua state
+ * @return number of values returned to Lua
  *
  * - Argument 1 (userdata): a host
  * - Return value (string): a string describing this host
@@ -182,11 +180,11 @@ static const luaL_Reg host_meta[] = {
 };
 
 /**
- * \brief Registers the host functions into the table simgrid.host.
+ * @brief Registers the host functions into the table simgrid.host.
  *
  * Also initialize the metatable of the host userdata type.
  *
- * \param L a lua state
+ * @param L a lua state
  */
 void sglua_register_host_functions(lua_State* L)
 {