File content as of revision 1:2338acfb180d:

#include "LineSerial.h"

LineSerial::LineSerial(PinName tx, PinName rx, const char *name) : Serial(tx, rx, name), 
    readBuffer(NULL),
    readBufferSize(0),
    readBufferCount(0),
    readLineFunc(NULL)
{
}

LineSerial::~LineSerial()
{
    if (this->readBuffer != NULL)
    {
        delete this->readBuffer;
        this->readBuffer = NULL;
    }
}

void LineSerial::allocateReadBuffer(size_t size)
{
    // free memory.
    if (this->readBuffer != NULL)
    {
        delete this->readBuffer;
    }
    
    // allocate memory.
    if (size <= 0)
    {
        this->readBuffer = NULL;
    }
    else
    {
        this->readBuffer = new char[size];
    }
    
    // initialize related values.
    this->readBufferSize = size <= 0 ? 0 : size;
    this->readBufferCount = 0;
}

void LineSerial::attachReadLine(void (*func)(const char* str))
{
    this->readLineFunc = func;
}

void LineSerial::task()
{
    if (this->readable())
    {
        char c = this->getc();
        switch (c)
        {
        case '\r':
            if (this->readLineFunc != NULL)
            {
                this->readBuffer[this->readBufferCount] = '\0';
                this->readLineFunc(this->readBuffer);
                this->readBufferCount = 0;
            }
            break;
        case '\b':
            if (!this->removeReadBuffer())
            {
                this->putc('\a');
            }
            else
            {
                this->puts("\b \b");
                
            }
            break;
        default:
            if (!this->appendReadBuffer(c))
            {
                this->putc('\a');
            }
            else
            {
                this->putc(c);
            }
            break;
        }
    }
}

bool LineSerial::appendReadBuffer(char data)
{
    if (this->readBuffer == NULL)
    {
        return false;
    }
    if (this->readBufferCount >= this->readBufferSize - 1)
    {
        return false;
    }
    
    this->readBuffer[this->readBufferCount++] = data;
    return true;
}

bool LineSerial::removeReadBuffer()
{
    if (this->readBuffer == NULL)
    {
        return false;
    }
    if (this->readBufferCount <= 0)
    {
        return false;
    }
    
    this->readBufferCount--;
    return true;
}