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int StreamBuf::overflow(int ch) // writing
{
size_t offs = getOffset();
if (offs >= maxend) // at maxend: no more space
return EOF;
// define the writing buffer
setp(allData + bufbeg, allData + bufend);
pbump(offs - bufbeg); // go to the pos. to write the next ch
*pptr() = ch; // write ch to the buffere
pbump(1);
++offset;
// maybe enlarge getend
getend = max(getend, bufbeg + (pptr() - pbase()));
d_last = WRITE; // change to writing mode
// return the last written char
return static_cast<unsigned char>(ch);
}
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