WIP: remove the old database abstraction layer

remove such classes:
- DbBase
- DbConn
- DbTextStream
- Db

while here:
- remove: TextStream, SLog, TexTextStream

winixd/core/plugin.cpp

@@ -5,7 +5,7 @@
  */
 
 /*
- * Copyright (c) 2008-2023, Tomasz Sowa
+ * Copyright (c) 2008-2024, Tomasz Sowa
  * All rights reserved.
  * 
  * Redistribution and use in source and binary forms, with or without
@@ -65,7 +65,6 @@ Plugin::Plugin()
 {
 	current_plugin  = -1;
 
-	db              = nullptr;
 	cur             = nullptr;
 	system          = nullptr;
 	functions       = nullptr;
@@ -83,12 +82,6 @@ Plugin::~Plugin()
 }
 
 
-void Plugin::SetDb(Db * pdb)
-{
-	db = pdb;
-}
-
-
 void Plugin::SetSystem(System * psystem)
 {
 	system = psystem;
@@ -145,14 +138,13 @@ void Plugin::Unlock()
 bool Plugin::SetDependencyForPluginInfo(morm::ModelConnector * pmodel_connector, Log * plog, Cur * pcur, PluginInfo & info)
 {
 	// for safety we call a plugin function only when all our pointers are not null
-	bool res = (pmodel_connector && plog && pcur && db && config && system && functions && templates && synchro && session_manager && winix_request);
+	bool res = (pmodel_connector && plog && pcur && config && system && functions && templates && synchro && session_manager && winix_request);
 
 	if( !res )
 	{
 		log << log1 << "Plugin: cannot call a function - some of the winix pointers are null" << logend;
 	}
 
-	info.db        = db;
 	info.config    = config;
 	info.cur       = pcur;
 	info.system    = system;
@@ -198,8 +190,8 @@ void * Plugin::LoadInitFun(const wchar_t * filename, Fun1 & fun_init)
 {
 char file[WINIX_OS_PATH_SIZE];
 
-	if( !wide_to_utf8(filename, file, WINIX_OS_PATH_SIZE) )
-		return 0;
+	if( !pt::wide_to_utf8(filename, (char*)file, WINIX_OS_PATH_SIZE) )
+		return nullptr;
 
 	void * p = dlopen(file, RTLD_NOW | RTLD_LOCAL);
 
@@ -207,7 +199,7 @@ char file[WINIX_OS_PATH_SIZE];
 	{
 		log << log1 << "Plugin: cannot load a plugin: \"" << filename << "\"" << logend;
 		log << log1 << "Plugin: dlerror: " << dlerror() << logend;
-		return 0;
+		return nullptr;
 	}
 	
 	fun_init = (Fun1)dlsym(p, "Init");
@@ -218,14 +210,14 @@ char file[WINIX_OS_PATH_SIZE];
 			<< " (there is no Init() function)" << logend;
 
 		dlclose(p);
-		return 0;
+		return nullptr;
 	}
 
 	log << log2 << "Plugin: plugin loaded"
 		<< ", file: " << filename 
 		<< ", index: " << plugins.size() << logend;
 
-return p;
+	return p;
 }