added: notifications to users' emails

(core/notify.h core/notify.cpp)
       templatesnotify directory
       all notifications are managed by a second thread


git-svn-id: svn://ttmath.org/publicrep/cmslu/trunk@512 e52654a7-88a9-db11-a3e9-0013d4bc506e

core/misc.cpp

@@ -358,3 +358,47 @@ std::string::size_type i;
 			s[i] = s[i] - 'A' + 'a';
 	}
 }
+
+
+
+bool ValidateEmail(const std::string & email)
+{
+	if( email.empty() )
+		return false;
+	
+	bool correct = true;
+	size_t i;
+	char allowed_chars[] = "!#$%&'*+-/=?^_`{|}~.@";
+	int at = 0;
+	
+	for(i=0 ; i<email.length() && correct ; ++i)
+	{
+		correct = false;
+		
+		if(	(email[i] >= 'A' && email[i]<='Z') ||
+			(email[i] >= 'a' && email[i]<='z') ||
+			(email[i] >= '0' && email[i]<='9') )
+		{
+			correct = true;
+		}
+		else
+		{
+			for(size_t a=0 ; a < sizeof(allowed_chars)-1 ; ++a)
+			{
+				if( email[i] == allowed_chars[a] )
+				{
+					correct = true;
+					break;
+				}
+			}
+		}
+		
+		if( email[i] == '@' )
+			++at;
+	}
+
+	if( at != 1 )
+		return false;
+	
+return correct;	
+}