CommHandler.cpp

00001 /**
00002  * @file    CommHandler.cpp
00003  * @brief   Core Utility - Manage ASCII communication between devices
00004  * @author  sam grove
00005  * @version 1.0
00006  * @see     
00007  *
00008  * Copyright (c) 2013
00009  *
00010  * Licensed under the Apache License, Version 2.0 (the "License");
00011  * you may not use this file except in compliance with the License.
00012  * You may obtain a copy of the License at
00013  *
00014  *     http://www.apache.org/licenses/LICENSE-2.0
00015  *
00016  * Unless required by applicable law or agreed to in writing, software
00017  * distributed under the License is distributed on an "AS IS" BASIS,
00018  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
00019  * See the License for the specific language governing permissions and
00020  * limitations under the License.
00021  */
00022 
00023 #include "CommHandler.h"
00024 #include <string.h>
00025 
00026 CommHandler::CommHandler( void )
00027 {
00028     return;
00029 }
00030 
00031 void CommHandler::attachMsg( char *string, char *(*function)(char *) )
00032 {
00033     MsgObj *new_node = new MsgObj [1];
00034     // make sure the new object was allocated
00035     if (0 == new_node)
00036     {
00037         ERROR("Memory Allocation Failed\n");
00038     }
00039     // store the user parameters
00040     new_node->string = string;
00041     new_node->handler.attach( function );
00042     // and insert them into the list
00043     _list.append(new_node);
00044 
00045     return;
00046 }
00047 
00048 char *CommHandler::serviceMessage( char* buffer )
00049 {
00050     uint32_t cnt = _list.length();
00051     node *item;
00052     MsgObj *tmp_data;
00053 
00054     for(uint32_t i=1; i<=cnt; ++i)
00055     {
00056         item = _list.pop(i);
00057         tmp_data = (MsgObj *)item->data;
00058         // Test the input against the stored record
00059         if( 0 ==  memcmp( buffer, tmp_data->string, strlen(tmp_data->string) ) )
00060         {
00061             return tmp_data->handler( buffer );
00062         }
00063     }
00064 
00065     return 0;
00066 }
00067 
00068 char *CommHandler::messageLookup( uint32_t const loc )
00069 {
00070     node *tmp_item = _list.pop( loc );
00071     
00072     if(0 == tmp_item)
00073     {
00074         return 0;
00075     }
00076     
00077     MsgObj *tmp_data = (MsgObj *)tmp_item->data;
00078 
00079     return tmp_data->string;
00080 }
00081