/elec/propeller-clock

/*

  PString.cpp - Lightweight printable string class

  Copyright (c) 2009-2012 Mikal Hart.  All right reserved.

  This library is free software; you can redistribute it and/or

  modify it under the terms of the GNU Lesser General Public

  License as published by the Free Software Foundation; either

  version 2.1 of the License, or (at your option) any later version.

  This library is distributed in the hope that it will be useful,

  but WITHOUT ANY WARRANTY; without even the implied warranty of

  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU

  Lesser General Public License for more details.

  You should have received a copy of the GNU Lesser General Public

  License along with this library; if not, write to the Free Software

  Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA

*/

#include "PString.h"

#include "Arduino.h"

void PString::begin()

{

  _cur = _buf;

  if (_size > 0)

    _buf[0] = '\0';

}

void PString::begin(char *buf, size_t size)

{

	_buf = buf;

	_size = size;

	_cur = _buf + strlen(_buf);

}

#if defined(ARDUINO) && ARDUINO >= 100

size_t PString::write(uint8_t b)

#else

void PString::write(uint8_t b)

#endif

{

  if (_cur + 1 < _buf + _size)

  {

    *_cur++ = (char)b;

    *_cur = '\0';

#if defined(ARDUINO) && ARDUINO >= 100

		return 1;

#endif

	}

#if defined(ARDUINO) && ARDUINO >= 100

	return 0;

#endif

}

int PString::format(char *str, ...) 

{ 

  va_list argptr;  

  va_start(argptr, str); 

  int ret = vsnprintf(_cur, _size - (_cur - _buf), str, argptr);

  if (_size)

     while (*_cur) 

        ++_cur;

  return ret;

}