streamsize stringbuf::_M_xsputnc(char_type __char, streamsize __count)
{
if (((__M_mode & ios_base::out) == 0) || (__count <= 0)) return 0;
streamsize __nwritten = 0;
// If the put pointer is somewhere in the middle of the string, then overwrite instead of append.
if (pbase() == __M_str.begin())
{
ptrdiff_t __avail = __M_str.end() - pptr();
if (__avail >= __count)
{
VOS_memset_s(pptr(), epptr() - pptr(), __char, static_cast<size_t>(__count));
pbump(static_cast<int>(__count));
return __count;
}
else
{
VOS_memset_s(pptr(), epptr() - pptr(), __char, __avail);
__nwritten += __avail;
__count -= __avail;
}
}
// At this point we know we're appending.
size_t __app_size = static_cast<size_t>(__count);
char_type* __data_ptr;
if (__M_mode & ios_base::in)
{
ptrdiff_t __get_offset = gptr() - eback();
__M_str.append(__app_size, __char);
__data_ptr = __M_str.begin();
setg(__data_ptr, __data_ptr + __get_offset, __M_str.end());
}
else
{
__M_str.append(__app_size, __char);
__data_ptr = __M_str.begin();
}
setp(__data_ptr, __M_str.end());
pbump(static_cast<int>(__M_str.size()));
__nwritten += __app_size;
return __nwritten;
}
streamsize streambuf::_M_xsputnc(char_type __char, streamsize __count)
{
streamsize __put_count = 0;
while (__put_count < __count)
{
if (__M_pnext < __M_pend)
{
size_t __chunk = min(static_cast<size_t>(__M_pend - __M_pnext), static_cast<size_t>(__count - __put_count));
VOS_memset_s(__M_pnext, __M_pend - __M_pnext, __char, __chunk);
__put_count += __chunk;
__M_pnext += __chunk;
}
else if (overflow(static_cast<int>(__char)) != EOF)
{
++__put_count;
}
else
{
break;
}
}
return __put_count;
}
