www.pudn.com > calc5.zip > strbuf.cpp

//------------------------------------ 
//  (c) Bartosz Milewski, 1994 
//------------------------------------ 
#include "strbuf.h" 
#include  
 
int StringBuffer::AddString (char const * str) 
{ 
    int len = strlen (str); 
    int offset = _curStrOff; 
    // is there enough space? 
    if (_curStrOff + len + 1 >= _bufSize) 
    { 
        Reallocate (len + 1); 
    } 
    // copy the string there 
    strncpy (&_strBuf [_curStrOff], str, len); 
    // calculate new offset 
    _curStrOff += len; 
    _strBuf [_curStrOff] = 0;  // null terminate 
    ++_curStrOff; 
    return offset; 
} 
 
void StringBuffer::Reallocate (int addLen) 
{ 
    int newSize = _bufSize * 2; 
    if (newSize <= _curStrOff + addLen) 
        newSize = _curStrOff + addLen; 
    char * newBuf = new char [newSize]; 
    for (int i = 0; i < _curStrOff; ++i) 
        newBuf [i] = _strBuf [i]; 
    delete []_strBuf; 
    _strBuf = newBuf; 
    _bufSize = newSize; 
}