/**

  * vim: set ts=4 :

  * =============================================================================

  * SourceMod

  * Copyright (C) 2004-2008 AlliedModders LLC.  All rights reserved.

  * =============================================================================

  *

  * This program is free software; you can redistribute it and/or modify it under

  * the terms of the GNU General Public License, version 3.0, as published by the

  * Free Software Foundation.

  * 

  * 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/>.

  *

  * As a special exception, AlliedModders LLC gives you permission to link the

  * code of this program (as well as its derivative works) to "Half-Life 2," the

  * "Source Engine," the "SourcePawn JIT," and any Game MODs that run on software

  * by the Valve Corporation.  You must obey the GNU General Public License in

  * all respects for all other code used.  Additionally, AlliedModders LLC grants

  * this exception to all derivative works.  AlliedModders LLC defines further

  * exceptions, found in LICENSE.txt (as of this writing, version JULY-31-2007),

  * or <http://www.sourcemod.net/license.php>.

  *

  * Version: $Id$

  */

 #include <stdlib.h>

 #include "ExtensionSys.h"

 #include "LibrarySys.h"

 #include "ShareSys.h"

 #include "Logger.h"

 #include "sourcemm_api.h"

 #include "sm_srvcmds.h"

 #include "sm_stringutil.h"

 CExtensionManager g_Extensions;

 IdentityType_t g_ExtType;

 void CExtension::Initialize(const char *filename, const char *path)

 {

 	m_pAPI = NULL;

 	m_pIdentToken = NULL;

 	unload_code = 0;

 	m_bFullyLoaded = false;

 	m_File.assign(filename);

 	m_Path.assign(path);

 }

 CRemoteExtension::CRemoteExtension(IExtensionInterface *pAPI, const char *filename, const char *path)

 {

 	Initialize(filename, path);

 	m_pAPI = pAPI;

 }

 CLocalExtension::CLocalExtension(const char *filename)

 {

 	m_PlId = 0;

 	m_pLib = NULL;

 	char path[PLATFORM_MAX_PATH];

 	/* First see if there is an engine specific build! */

 	g_SourceMod.BuildPath(Path_SM, 

 		path, 

 		PLATFORM_MAX_PATH, 

 #if defined METAMOD_PLAPI_VERSION

 #if defined ORANGEBOX_BUILD

 		"extensions/auto.2.ep2/%s",

 #else

 		"extensions/auto.2.ep1/%s",

 #endif //ORANGEBOX_BUILD

 #else  //METAMOD_PLAPI_VERSION

 		"extensions/auto.1.ep1/%s",

 #endif //METAMOD_PLAPI_VERSION

 		filename);

 	/* Try the "normal" version */

 	if (!g_LibSys.IsPathFile(path))

 	{

 		g_SourceMod.BuildPath(Path_SM, path, PLATFORM_MAX_PATH, "extensions/%s", filename);

 	}

 	Initialize(filename, path);

 }

 bool CRemoteExtension::Load(char *error, size_t maxlength)

 {

 	if (!PerformAPICheck(error, maxlength))

 	{

 		m_pAPI = NULL;

 		return false;

 	}

 	if (!CExtension::Load(error, maxlength))

 	{

 		m_pAPI = NULL;

 		return false;

 	}

 	return true;

 }

 bool CLocalExtension::Load(char *error, size_t maxlength)

 {

 	m_pLib = g_LibSys.OpenLibrary(m_Path.c_str(), error, maxlength);

 	if (m_pLib == NULL)

 	{

 		return false;

 	}

 	typedef IExtensionInterface *(*GETAPI)();

 	GETAPI pfnGetAPI = NULL;

 	if ((pfnGetAPI=(GETAPI)m_pLib->GetSymbolAddress("GetSMExtAPI")) == NULL)

 	{

 		m_pLib->CloseLibrary();

 		m_pLib = NULL;

 		snprintf(error, maxlength, "Unable to find extension entry point");

 		return false;

 	}

 	m_pAPI = pfnGetAPI();

 	/* Check pointer and version */

 	if (!PerformAPICheck(error, maxlength))

 	{

 		m_pLib->CloseLibrary();

 		m_pLib = NULL;

 		m_pAPI = NULL;

 		return false;

 	}

 	/* Load as MM:S */

 	if (m_pAPI->IsMetamodExtension())

 	{

 		bool already;

 		m_PlId = g_pMMPlugins->Load(m_Path.c_str(), g_PLID, already, error, maxlength);

 	}

 	if (!CExtension::Load(error, maxlength))

 	{

 		if (m_pAPI->IsMetamodExtension())

 		{

 			if (m_PlId)

 			{

 				char dummy[255];

 				g_pMMPlugins->Unload(m_PlId, true, dummy, sizeof(dummy));

 				m_PlId = 0;

 			}

 		}

 		m_pLib->CloseLibrary();

 		m_pLib = NULL;

 		m_pAPI = NULL;

 		return false;

 	}

 	return true;

 }

 void CRemoteExtension::Unload()

 {

 }

 void CLocalExtension::Unload()

 {

 	if (m_pAPI != NULL && m_PlId)

 	{

 		char temp_buffer[255];

 		g_pMMPlugins->Unload(m_PlId, true, temp_buffer, sizeof(temp_buffer));

 		m_PlId = 0;

 	}

 	if (m_pLib != NULL)

 	{

 		m_pLib->CloseLibrary();

 		m_pLib = NULL;

 	}

 }

 bool CRemoteExtension::IsExternal()

 {

 	return true;

 }

 bool CLocalExtension::IsExternal()

 {

 	return false;

 }

 CExtension::~CExtension()

 {

 	DestroyIdentity();

 }

 bool CExtension::PerformAPICheck(char *error, size_t maxlength)

 {

 	if (!m_pAPI)

 	{

 		snprintf(error, maxlength, "No IExtensionInterface instance provided");

 		return false;

 	}

 	if (m_pAPI->GetExtensionVersion() > SMINTERFACE_EXTENSIONAPI_VERSION)

 	{

 		snprintf(error, maxlength, "Extension version is too new to load (%d, max is %d)", m_pAPI->GetExtensionVersion(), SMINTERFACE_EXTENSIONAPI_VERSION);

 		return false;

 	}

 	return true;

 }

 bool CExtension::Load(char *error, size_t maxlength)

 {

 	CreateIdentity();

 	if (!m_pAPI->OnExtensionLoad(this, &g_ShareSys, error, maxlength, !g_SourceMod.IsMapLoading()))

 	{

 		DestroyIdentity();

 		return false;

 	}

 	else

 	{

 		/* Check if we're past load time */

 		if (!g_SourceMod.IsMapLoading())

 		{

 			m_pAPI->OnExtensionsAllLoaded();

 		}

 	}

 	return true;

 }

 void CExtension::CreateIdentity()

 {

 	if (m_pIdentToken != NULL)

 	{

 		return;

 	}

 	m_pIdentToken = g_ShareSys.CreateIdentity(g_ExtType, this);

 }

 void CExtension::DestroyIdentity()

 {

 	if (m_pIdentToken == NULL)

 	{

 		return;

 	}

 	g_ShareSys.DestroyIdentity(m_pIdentToken);

 	m_pIdentToken = NULL;

 }

 void CExtension::MarkAllLoaded()

 {

 	assert(m_bFullyLoaded == false);

 	if (!m_bFullyLoaded)

 	{

 		m_bFullyLoaded = true;

 		m_pAPI->OnExtensionsAllLoaded();

 	}

 }

 void CExtension::AddPlugin(CPlugin *pPlugin)

 {

 	/* Unfortunately we have to do this :( */

 	if (m_Dependents.find(pPlugin) != m_Dependents.end())

 	{

 		m_Dependents.push_back(pPlugin);

 	}

 }

 void CExtension::SetError(const char *error)

 {

 	m_Error.assign(error);

 }

 IExtensionInterface *CExtension::GetAPI()

 {

 	return m_pAPI;

 }

 const char *CExtension::GetFilename()

 {

 	return m_File.c_str();

 }

 IdentityToken_t *CExtension::GetIdentity()

 {

 	return m_pIdentToken;

 }

 bool CRemoteExtension::IsLoaded()

 {

 	return (m_pAPI != NULL);

 }

 bool CLocalExtension::IsLoaded()

 {

 	return (m_pLib != NULL);

 }

 void CExtension::AddDependency(IfaceInfo *pInfo)

 {

 	if (m_Deps.find(*pInfo) == m_Deps.end())

 	{

 		m_Deps.push_back(*pInfo);

 	}

 }

 bool operator ==(const IfaceInfo &i1, const IfaceInfo &i2)

 {

 	return (i1.iface == i2.iface) && (i1.owner == i2.owner);

 }

 void CExtension::AddChildDependent(CExtension *pOther, SMInterface *iface)

 {

 	IfaceInfo info;

 	info.iface = iface;

 	info.owner = pOther;

 	List<IfaceInfo>::iterator iter;

 	for (iter = m_ChildDeps.begin();

 		 iter != m_ChildDeps.end();

 		 iter++)

 	{

 		IfaceInfo &other = (*iter);

 		if (other == info)

 		{

 			return;

 		}

 	}

 	m_ChildDeps.push_back(info);

 }

 ITERATOR *CExtension::FindFirstDependency(IExtension **pOwner, SMInterface **pInterface)

 {

 	List<IfaceInfo>::iterator iter = m_Deps.begin();

 	if (iter == m_Deps.end())

 	{

 		return NULL;

 	}

 	if (pOwner)

 	{

 		*pOwner = (*iter).owner;

 	}

 	if (pInterface)

 	{

 		*pInterface = (*iter).iface;

 	}

 	List<IfaceInfo>::iterator *pIter = new List<IfaceInfo>::iterator(iter);

 	return (ITERATOR *)pIter;

 }

 bool CExtension::FindNextDependency(ITERATOR *iter, IExtension **pOwner, SMInterface **pInterface)

 {

 	List<IfaceInfo>::iterator *pIter = (List<IfaceInfo>::iterator *)iter;

 	List<IfaceInfo>::iterator _iter;

 	if (_iter == m_Deps.end())

 	{

 		return false;

 	}

 	_iter++;

 	if (pOwner)

 	{

 		*pOwner = (*_iter).owner;

 	}

 	if (pInterface)

 	{

 		*pInterface = (*_iter).iface;

 	}

 	*pIter = _iter;

 	if (_iter == m_Deps.end())

 	{

 		return false;

 	}

 	return true;

 }

 void CExtension::FreeDependencyIterator(ITERATOR *iter)

 {

 	List<IfaceInfo>::iterator *pIter = (List<IfaceInfo>::iterator *)iter;

 	delete pIter;

 }

 void CExtension::AddInterface(SMInterface *pInterface)

 {

 	m_Interfaces.push_back(pInterface);

 }

 bool CExtension::IsRunning(char *error, size_t maxlength)

 {

 	if (!IsLoaded())

 	{

 		if (error)

 		{

 			snprintf(error, maxlength, "%s", m_Error.c_str());

 		}

 		return false;

 	}

 	return m_pAPI->QueryRunning(error, maxlength);

 }

 void CExtension::AddLibrary(const char *library)

 {

 	m_Libraries.push_back(library);

 }

 /*********************

  * EXTENSION MANAGER *

  *********************/

 void CExtensionManager::OnSourceModAllInitialized()

 {

 	g_ExtType = g_ShareSys.CreateIdentType("EXTENSION");

 	g_PluginSys.AddPluginsListener(this);

 	g_RootMenu.AddRootConsoleCommand("exts", "Manage extensions", this);

 	g_ShareSys.AddInterface(NULL, this);

 }

 void CExtensionManager::OnSourceModShutdown()

 {

 	g_RootMenu.RemoveRootConsoleCommand("exts", this);

 	g_ShareSys.DestroyIdentType(g_ExtType);

 }

 void CExtensionManager::Shutdown()

 {

 	List<CExtension *>::iterator iter;

 	while ((iter = m_Libs.begin()) != m_Libs.end())

 	{

 		UnloadExtension((*iter));

 	}

 }

 void CExtensionManager::TryAutoload()

 {

 	char path[PLATFORM_MAX_PATH];

 	g_SourceMod.BuildPath(Path_SM, path, sizeof(path), "extensions");

 	IDirectory *pDir = g_LibSys.OpenDirectory(path);

 	if (!pDir)

 	{

 		return;

 	}

 	const char *lfile;

 	size_t len;

 	while (pDir->MoreFiles())

 	{

 		if (pDir->IsEntryDirectory())

 		{

 			pDir->NextEntry();

 			continue;

 		}

 		lfile = pDir->GetEntryName();

 		len = strlen(lfile);

 		if (len <= 9) /* size of ".autoload" */

 		{

 			pDir->NextEntry();

 			continue;

 		}

 		if (strcmp(&lfile[len - 9], ".autoload") != 0)

 		{

 			pDir->NextEntry();

 			continue;

 		}

 		char file[PLATFORM_MAX_PATH];

 		len = UTIL_Format(file, sizeof(file), "%s", lfile);

 		strcpy(&file[len - 9], ".ext." PLATFORM_LIB_EXT);

 		LoadAutoExtension(file);

 		pDir->NextEntry();

 	}

 }

 IExtension *CExtensionManager::LoadAutoExtension(const char *path)

 {

 	if (!strstr(path, "." PLATFORM_LIB_EXT))

 	{

 		char newpath[PLATFORM_MAX_PATH];

 		g_LibSys.PathFormat(newpath, sizeof(newpath), "%s.%s", path, PLATFORM_LIB_EXT);

 		return LoadAutoExtension(newpath);

 	}

 	IExtension *pAlready;

 	if ((pAlready=FindExtensionByFile(path)) != NULL)

 	{

 		return pAlready;

 	}

 	char error[256];

 	CExtension *p = new CLocalExtension(path);

 	/* We put us in the list beforehand so extensions that check for each other

 	 * won't recursively load each other.

 	 */

 	m_Libs.push_back(p);

 	if (!p->Load(error, sizeof(error)) || !p->IsLoaded())

 	{

 		g_Logger.LogError("[SM] Unable to load extension \"%s\": %s", path, error);

 		p->SetError(error);

 	}

 	return p;

 }

 IExtension *CExtensionManager::FindExtensionByFile(const char *file)

 {

 	List<CExtension *>::iterator iter;

 	CExtension *pExt;

 	/* Chomp off the path */

 	char lookup[PLATFORM_MAX_PATH];

 	g_LibSys.GetFileFromPath(lookup, sizeof(lookup), file);

 	for (iter=m_Libs.begin(); iter!=m_Libs.end(); iter++)

 	{

 		pExt = (*iter);

 		char short_file[PLATFORM_MAX_PATH];

 		g_LibSys.GetFileFromPath(short_file, sizeof(short_file), pExt->GetFilename());

 		if (strcmp(lookup, short_file) == 0)

 		{

 			return pExt;

 		}

 	}

 	/* If we got no results, test if there was a platform extension.

 	 * If not, add one.

 	 */

 	if (!strstr(file, "." PLATFORM_LIB_EXT))

 	{

 		char path[PLATFORM_MAX_PATH];

 		UTIL_Format(path, sizeof(path), "%s.%s", file, PLATFORM_LIB_EXT);

 		return FindExtensionByFile(path);

 	}

 	return NULL;

 }

 IExtension *CExtensionManager::FindExtensionByName(const char *ext)

 {

 	List<CExtension *>::iterator iter;

 	CExtension *pExt;

 	IExtensionInterface *pAPI;

 	const char *name;

 	for (iter=m_Libs.begin(); iter!=m_Libs.end(); iter++)

 	{

 		pExt = (*iter);

 		if (!pExt->IsLoaded())

 		{

 			continue;

 		}

 		if ((pAPI = pExt->GetAPI()) == NULL)

 		{

 			continue;

 		}

 		name = pAPI->GetExtensionName();

 		if (!name)

 		{

 			continue;

 		}

 		if (strcmp(name, ext) == 0)

 		{

 			return pExt;

 		}

 	}

 	return NULL;

 }

 IExtension *CExtensionManager::LoadExtension(const char *file, char *error, size_t maxlength)

 {

 	IExtension *pAlready;

 	if ((pAlready=FindExtensionByFile(file)) != NULL)

 	{

 		return pAlready;

 	}

 	CExtension *pExt = new CLocalExtension(file);

 	if (!pExt->Load(error, maxlength) || !pExt->IsLoaded())

 	{

 		pExt->Unload();

 		delete pExt;

 		return NULL;

 	}

 	/* :TODO: do QueryRunning check if the map is loaded */

 	m_Libs.push_back(pExt);

 	return pExt;

 }

 void CExtensionManager::BindDependency(IExtension *pRequester, IfaceInfo *pInfo)

 {

 	CExtension *pExt = (CExtension *)pRequester;

 	CExtension *pOwner = (CExtension *)pInfo->owner;

 	pExt->AddDependency(pInfo);

 	IExtensionInterface *pAPI = pExt->GetAPI();

 	if (pAPI && !pAPI->QueryInterfaceDrop(pInfo->iface))

 	{

 		pOwner->AddChildDependent(pExt, pInfo->iface);

 	}

 }

 void CExtensionManager::AddInterface(IExtension *pOwner, SMInterface *pInterface)

 {

 	CExtension *pExt = (CExtension *)pOwner;

 	pExt->AddInterface(pInterface);

 }

 void CExtensionManager::BindChildPlugin( IExtension *pParent, CPlugin *pPlugin )

 {

 	CExtension *pExt = (CExtension *)pParent;

 	pExt->AddPlugin(pPlugin);

 }

 void CExtensionManager::OnPluginDestroyed(IPlugin *plugin)

 {

 	List<CExtension *>::iterator iter;

 	for (iter=m_Libs.begin(); iter!=m_Libs.end(); iter++)

 	{

 		(*iter)->DropRefsTo((CPlugin *)plugin);

 	}

 }

 CExtension *CExtensionManager::FindByOrder(unsigned int num)

 {

 	if (num < 1 || num > m_Libs.size())

 	{

 		return NULL;

 	}

 	List<CExtension *>::iterator iter = m_Libs.begin();

 	while (iter != m_Libs.end())

 	{

 		if (--num == 0)

 		{

 			return (*iter);

 		}

 		iter++;

 	}

 	return NULL;

 }

 bool CExtensionManager::UnloadExtension(IExtension *_pExt)

 {

 	if (!_pExt)

 	{

 		return false;

 	}

 	CExtension *pExt = (CExtension *)_pExt;

 	if (m_Libs.find(pExt) == m_Libs.end())

 	{

 		return false;

 	}

 	/* First remove us from internal lists */

 	g_ShareSys.RemoveInterfaces(_pExt);

 	m_Libs.remove(pExt);

 	List<CExtension *> UnloadQueue;

 	/* Handle dependencies */

 	if (pExt->IsLoaded())

 	{

 		/* Unload any dependent plugins */

 		List<CPlugin *>::iterator p_iter = pExt->m_Dependents.begin();

 		while (p_iter != pExt->m_Dependents.end())

 		{

 			/* We have to manually unlink ourselves here, since we're no longer being managed */

 			g_PluginSys.UnloadPlugin((*p_iter));

 			p_iter = pExt->m_Dependents.erase(p_iter);

 		}

 		List<String>::iterator s_iter;

 		for (s_iter = pExt->m_Libraries.begin();

 			 s_iter != pExt->m_Libraries.end();

 			 s_iter++)

 		{

 			g_PluginSys.OnLibraryAction((*s_iter).c_str(), false, true);

 		}

 		/* Notify and/or unload all dependencies */

 		List<CExtension *>::iterator c_iter;

 		CExtension *pDep;

 		IExtensionInterface *pAPI;

 		for (c_iter = m_Libs.begin(); c_iter != m_Libs.end(); c_iter++)

 		{

 			pDep = (*c_iter);

 			if ((pAPI=pDep->GetAPI()) == NULL)

 			{

 				continue;

 			}

 			if (pDep == pExt)

 			{

 				continue;

 			}

 			/* Now, get its dependency list */

 			bool dropped = false;

 			List<IfaceInfo>::iterator i_iter = pDep->m_Deps.begin();

 			while (i_iter != pDep->m_Deps.end())

 			{

 				if ((*i_iter).owner == _pExt)

 				{

 					if (!pAPI->QueryInterfaceDrop((*i_iter).iface))

 					{

 						if (!dropped)

 						{

 							dropped = true;

 							UnloadQueue.push_back(pDep);

 						}

 					}

 					pAPI->NotifyInterfaceDrop((*i_iter).iface);

 					i_iter = pDep->m_Deps.erase(i_iter);

 				}

 				else

 				{

 					i_iter++;

 				}

 			}

 			/* Flush out any back references to this plugin */

 			i_iter = pDep->m_ChildDeps.begin();

 			while (i_iter != pDep->m_ChildDeps.end())

 			{

 				if ((*i_iter).owner == pExt)

 				{

 					i_iter = pDep->m_ChildDeps.erase(i_iter);

 				}

 				else

 				{

 					i_iter++;

 				}

 			}

 		}

 		/* Unbind our natives from Core */

 		pExt->DropEverything();

 		/* Tell it to unload */

 		pAPI = pExt->GetAPI();

 		pAPI->OnExtensionUnload();

 	}

 	IdentityToken_t *pIdentity;

 	if ((pIdentity = pExt->GetIdentity()) != NULL)

 	{

 		SMGlobalClass *glob = SMGlobalClass::head;

 		while (glob)

 		{

 			glob->OnSourceModIdentityDropped(pIdentity);

 			glob = glob->m_pGlobalClassNext;

 		}

 	}

 	pExt->Unload();

 	delete pExt;

 	List<CExtension *>::iterator iter;

 	for (iter=UnloadQueue.begin(); iter!=UnloadQueue.end(); iter++)

 	{

 		/* NOTE: This is safe because the unload function backs out of anything not present */

 		UnloadExtension((*iter));

 	}

 	return true;

 }

 void CExtensionManager::MarkAllLoaded()

 {

 	List<CExtension *>::iterator iter;

 	CExtension *pExt;

 	for (iter=m_Libs.begin(); iter!=m_Libs.end(); iter++)

 	{

 		pExt = (*iter);

 		if (!pExt->IsLoaded())

 		{

 			continue;

 		}

 		if (pExt->m_bFullyLoaded)

 		{

 			continue;

 		}

 		pExt->MarkAllLoaded();

 	}

 }

 void CExtensionManager::AddDependency(IExtension *pSource, const char *file, bool required, bool autoload)

 {

 	/* This function doesn't really need to do anything now.  We make sure the 

 	 * other extension is loaded, but handling of dependencies is really done 

 	 * by the interface fetcher.

 	 */

 	if (required || autoload)

 	{

 		LoadAutoExtension(file);

 	}

 }

 void CExtensionManager::OnRootConsoleCommand(const char *cmdname, const CCommand &command)

 {

 	int argcount = command.ArgC();

 	if (argcount >= 3)

 	{

 		const char *cmd = command.Arg(2);

 		if (strcmp(cmd, "list") == 0)

 		{

 			List<CExtension *>::iterator iter;

 			CExtension *pExt;

 			unsigned int num = 1;

 			switch (m_Libs.size())

 			{

 			case 1:

 				{

 					g_RootMenu.ConsolePrint("[SM] Displaying 1 extension:");

 					break;

 				}

 			case 0:

 				{

 					g_RootMenu.ConsolePrint("[SM] No extensions are loaded.");

 					break;

 				}

 			default:

 				{

 					g_RootMenu.ConsolePrint("[SM] Displaying %d extensions:", m_Libs.size());

 					break;

 				}

 			}

 			for (iter=m_Libs.begin(); iter!=m_Libs.end(); iter++,num++)

 			{

 				pExt = (*iter);

 				if (pExt->IsLoaded())

 				{

 					char error[255];

 					if (!pExt->IsRunning(error, sizeof(error)))

 					{

 						g_RootMenu.ConsolePrint("[%02d] <FAILED> file \"%s\": %s", num, pExt->GetFilename(), error);

 					}

 					else

 					{

 						IExtensionInterface *pAPI = pExt->GetAPI();

 						const char *name = pAPI->GetExtensionName();

 						const char *version = pAPI->GetExtensionVerString();

 						const char *descr = pAPI->GetExtensionDescription();

 						g_RootMenu.ConsolePrint("[%02d] %s (%s): %s", num, name, version, descr);

 					}

 				} else {

 					g_RootMenu.ConsolePrint("[%02d] <FAILED> file \"%s\": %s", num, pExt->GetFilename(), pExt->m_Error.c_str());

 				}

 			}

 			return;

 		}

 		else if (strcmp(cmd, "info") == 0)

 		{

 			if (argcount < 4)

 			{

 				g_RootMenu.ConsolePrint("[SM] Usage: sm info <#>");

 				return;

 			}

 			const char *sId = command.Arg(3);

 			unsigned int id = atoi(sId);

 			if (id <= 0)

 			{

 				g_RootMenu.ConsolePrint("[SM] Usage: sm info <#>");

 				return;

 			}

 			if (m_Libs.size() == 0)

 			{

 				g_RootMenu.ConsolePrint("[SM] No extensions are loaded.");

 				return;

 			}

 			if (id > m_Libs.size())

 			{

 				g_RootMenu.ConsolePrint("[SM] No extension was found with id %d.", id);

 				return;

 			}

 			List<CExtension *>::iterator iter = m_Libs.begin();

 			CExtension *pExt = NULL;

 			while (iter != m_Libs.end())

 			{

 				if (--id == 0)

 				{

 					pExt = (*iter);

 					break;

 				}

 				iter++;

 			}

 			/* This should never happen */

 			if (!pExt)

 			{

 				g_RootMenu.ConsolePrint("[SM] No extension was found with id %d.", id);

 				return;

 			}

 			if (!pExt->IsLoaded())

 			{

 				g_RootMenu.ConsolePrint(" File: %s", pExt->GetFilename());

 				g_RootMenu.ConsolePrint(" Loaded: No (%s)", pExt->m_Error.c_str());

 			}

 			else

 			{

 				char error[255];

 				if (!pExt->IsRunning(error, sizeof(error)))

 				{

 					g_RootMenu.ConsolePrint(" File: %s", pExt->GetFilename());

 					g_RootMenu.ConsolePrint(" Loaded: Yes");

 					g_RootMenu.ConsolePrint(" Running: No (%s)", error);

 				}

 				else

 				{

 					IExtensionInterface *pAPI = pExt->GetAPI();

 					g_RootMenu.ConsolePrint(" File: %s", pExt->GetFilename());

 					g_RootMenu.ConsolePrint(" Loaded: Yes (version %s)", pAPI->GetExtensionVerString());

 					g_RootMenu.ConsolePrint(" Name: %s (%s)", pAPI->GetExtensionName(), pAPI->GetExtensionDescription());

 					g_RootMenu.ConsolePrint(" Author: %s (%s)", pAPI->GetExtensionAuthor(), pAPI->GetExtensionURL());

 					g_RootMenu.ConsolePrint(" Binary info: API version %d (compiled %s)", pAPI->GetExtensionVersion(), pAPI->GetExtensionDateString());

 					if (pExt->IsExternal())

 					{

 						g_RootMenu.ConsolePrint(" Method: Loaded by Metamod:Source, attached to SourceMod");

 					}

 					else if (pAPI->IsMetamodExtension())

 					{

 						g_RootMenu.ConsolePrint(" Method: Loaded by SourceMod, attached to Metamod:Source");

 					}

 					else

 					{

 						g_RootMenu.ConsolePrint(" Method: Loaded by SourceMod");