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#define XERR
#include "mapbase.ih"
void MapBase::setFileSize(mode_t mode)
try
{
// ios::
// in the file must exist
// out recreates unless also in
// ate start initially at the end. Needs in to prevent rewriting
// trunc truncates, with in|out reading also OK
// app when writing always reposition to the end
if (d_mode & ios::app)
d_mode |= ios::out;
if (
(d_mode & ios::trunc) // truncate or
or // out-mode w/o in-mode
((d_mode & ios::out) and (d_mode & ios::in) == 0)
)
{
if (creat(d_fname.c_str(), mode) == -1)
throw -1;
d_orgSize = 0;
return;
}
Stat stat{ d_fname }; // obtain the file's info
if (not stat)
throw -1;
d_orgSize = stat.size();
}
catch (...)
{
throw Exception{} << "can't open " << d_fname;
}
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