readline.cpp

00001 // Copyright (c) 2013, jake (at) allaboutjake (dot) com
00002 // All rights reserved.
00003 // 
00004 // Redistribution and use in source and binary forms, with or without
00005 // modification, are permitted provided that the following conditions are met:
00006 //     * Redistributions of source code must retain the above copyright
00007 //       notice, this list of conditions and the following disclaimer.
00008 //     * Redistributions in binary form must reproduce the above copyright
00009 //       notice, this list of conditions and the following disclaimer in the
00010 //       documentation and/or other materials provided with the distribution.
00011 //     * The name of the author and/or copyright holder nor the
00012 //       names of its contributors may be used to endorse or promote products
00013 //       derived from this software without specific prior written permission.
00014 // 
00015 // THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND
00016 // ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
00017 // WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
00018 // DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER, AUTHOR, OR ANY CONTRIBUTORS
00019 // BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 
00020 // CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE 
00021 // GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 
00022 // HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 
00023 // LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT 
00024 // OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
00025 
00026 // DESCRIPTION OF FILE:
00027 //
00028 // This file contains a very simple readline function used by the http and telnet
00029 // server threads.
00030 //
00031 
00032 #include "SimpleSocket.h"
00033 #include "mbed.h"
00034 #include "rtos.h"
00035 
00036 //Simple readline routine for use in the command prompt.
00037 int readline(ClientSocket* socket, char* buffer, int max_length) {
00038    int curPos = 0;
00039    
00040    while (1) {
00041         int c;
00042         
00043         //Wait for a character
00044         while ((c=socket->read()) < 0) {
00045             if (!socket->connected()) return -1;
00046             Thread::yield();
00047         }
00048             
00049         switch (c) {
00050             case '\r':
00051                 continue;
00052                                     
00053             case '\b':
00054                 if (curPos > 0) curPos--;
00055                 break; 
00056                 
00057             default:
00058                 buffer[curPos]= (char)(c & 0xFF);
00059                 curPos++;
00060                 if (curPos < max_length)
00061                     break;
00062                     
00063                 //FALLTHROUGH
00064             case '\n':
00065                 buffer[curPos]=0x00;  //string terminator
00066                 return curPos;
00067         }
00068     } 
00069 }
00070