File content as of revision 0:8ccbd963e74d:

/*
  pico_string.h
  2014 Copyright (c) Seeed Technology Inc.  All right reserved.

  Author:lawliet zou(lawliet.zou@gmail.com)
  2014-2-24

  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
*/
#ifndef __PICO_STRING_H__

class pico_string {

public:
    pico_string(){
        _len = 0;
        _buf = (char*)malloc(1);
        if (_buf) {
            _buf[0] = '\0';
        }
    }
    ~pico_string() {
        if (_buf) {
            free(_buf);
        }
    }
    bool empty() {
        return _len == 0;
    }
    void append(const char* s, int len) {
        if (_buf == NULL) {
            return;
        }
        char* p = (char*)malloc(_len+len+1);
        if (p == NULL) {
            return;
        }
        memcpy(p, _buf, _len);
        memcpy(p+_len, s, len);
        p[_len+len] = '\0';
        free(_buf);
        _buf = p;
    }
    void append(const char* s) {
        append(s, strlen(s));
    }
    char* c_str() {
        if (_buf) {
            return _buf;
        }
        return "";
    }
private:
    char* _buf;
    int _len;
};

#endif