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#include "rotatingstreambuf.ih"
// assume nRotations == 3. If the current log-file has any content then:
// x.2 -> x.3 if x.2 exists, rotate
// x.1 -> x.2 if x.1 exists, rotate.
// x -> x.1
void RotatingStreambuf::rotate(size_t nRotations)
{
{
lock_guard<mutex> lg{ d_mutex };
if (not d_content) // no content, nothing to
return; // rotate
}
// d_name: the name of this
string name = d_name + '.'; // object's log file
string newName = name + to_string(nRotations);
for (; --nRotations; )
{
string oldName = name + to_string(nRotations);
char const *old = oldName.c_str();
if (access(old, F_OK) == 0) // file exists
rename(old, newName.c_str()); // rename it.
newName = move(oldName);
}
lock_guard<mutex> lg{d_mutex};
d_out.close();
rename(d_name.c_str(), newName.c_str());
Exception::open(d_out, d_name);
if (d_header)
(*d_header)(d_out);
d_content = false;
}
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