Split log.{cc,h}.

1 files changed, 89 insertions, 0 deletions

diff --git a/src/lib/file_log.cc b/src/lib/file_log.cc
new file mode 100644
index 000000000..599211d10
--- /dev/null
+++ b/src/lib/file_log.cc
@@ -0,0 +1,89 @@
+/*
+    Copyright (C) 2012 Carl Hetherington <cth@carlh.net>
+
+    This program 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.
+
+    This program 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 this program; if not, write to the Free Software
+    Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
+
+*/
+
+#include "file_log.h"
+#include "cross.h"
+#include <cstdio>
+
+using std::cout;
+using std::string;
+using std::max;
+
+/** @param file Filename to write log to */
+FileLog::FileLog (boost::filesystem::path file)
+	: _file (file)
+{
+
+}
+
+void
+FileLog::do_log (string m)
+{
+	FILE* f = fopen_boost (_file, "a");
+	if (!f) {
+		cout << "(could not log to " << _file.string() << "): " << m << "\n";
+		return;
+	}
+
+	fprintf (f, "%s\n", m.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;
+}