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/*
Copyright (C) 2012 Carl Hetherington <cth@carlh.net>
This file is part of DCP-o-matic.
DCP-o-matic is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 2 of the License, or
(at your option) any later version.
DCP-o-matic is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with DCP-o-matic. If not, see <http://www.gnu.org/licenses/>.
*/
#include "file_log.h"
#include "cross.h"
#include "config.h"
#include <cstdio>
#include <iostream>
using std::cout;
using std::string;
using std::max;
using boost::shared_ptr;
/** @param file Filename to write log to */
FileLog::FileLog (boost::filesystem::path file)
: _file (file)
{
_config_connection = Config::instance()->Changed.connect (boost::bind (&FileLog::config_changed, this));
config_changed ();
}
void
FileLog::config_changed ()
{
set_types (Config::instance()->log_types ());
}
void
FileLog::do_log (shared_ptr<const LogEntry> entry)
{
FILE* f = fopen_boost (_file, "a");
if (!f) {
cout << "(could not log to " << _file.string() << "): " << entry.get() << "\n";
return;
}
fprintf (f, "%s\n", entry->get().c_str ());
fclose (f);
}
string
FileLog::head_and_tail (int amount) const
{
boost::mutex::scoped_lock lm (_mutex);
uintmax_t head_amount = amount;
uintmax_t tail_amount = amount;
uintmax_t size = boost::filesystem::file_size (_file);
if (size < (head_amount + tail_amount)) {
head_amount = size;
tail_amount = 0;
}
FILE* f = fopen_boost (_file, "r");
if (!f) {
return "";
}
string out;
char* buffer = new char[max(head_amount, tail_amount) + 1];
int N = fread (buffer, 1, head_amount, f);
buffer[N] = '\0';
out += string (buffer);
if (tail_amount > 0) {
out += "\n .\n .\n .\n";
fseek (f, - tail_amount - 1, SEEK_END);
N = fread (buffer, 1, tail_amount, f);
buffer[N] = '\0';
out += string (buffer) + "\n";
}
delete[] buffer;
fclose (f);
return out;
}
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