2 Copyright (C) 2012 Carl Hetherington <cth@carlh.net>
4 This program is free software; you can redistribute it and/or modify
5 it under the terms of the GNU General Public License as published by
6 the Free Software Foundation; either version 2 of the License, or
7 (at your option) any later version.
9 This program is distributed in the hope that it will be useful,
10 but WITHOUT ANY WARRANTY; without even the implied warranty of
11 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
12 GNU General Public License for more details.
14 You should have received a copy of the GNU General Public License
15 along with this program; if not, write to the Free Software
16 Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
29 /** @param file Filename to write log to */
30 FileLog::FileLog (boost::filesystem::path file)
37 FileLog::do_log (string m)
39 FILE* f = fopen_boost (_file, "a");
41 cout << "(could not log to " << _file.string() << "): " << m << "\n";
45 fprintf (f, "%s\n", m.c_str ());
50 FileLog::head_and_tail (int amount) const
52 boost::mutex::scoped_lock lm (_mutex);
54 uintmax_t head_amount = amount;
55 uintmax_t tail_amount = amount;
56 uintmax_t size = boost::filesystem::file_size (_file);
58 if (size < (head_amount + tail_amount)) {
63 FILE* f = fopen_boost (_file, "r");
70 char* buffer = new char[max(head_amount, tail_amount) + 1];
72 int N = fread (buffer, 1, head_amount, f);
74 out += string (buffer);
76 if (tail_amount > 0) {
77 out += "\n .\n .\n .\n";
79 fseek (f, - tail_amount - 1, SEEK_END);
81 N = fread (buffer, 1, tail_amount, f);
83 out += string (buffer) + "\n";