X-Git-Url: https://git.carlh.net/gitweb/?a=blobdiff_plain;f=src%2Flib%2Flog.cc;h=a3466538e8924a9880521ddc632f703127665745;hb=c8aaf58936988fd011b23997019ae7b35561f763;hp=52dff2982222620d81a9b7426c13c2a32beb523e;hpb=446427a28a055115d78d5ec513b9229571fca511;p=dcpomatic.git

diff --git a/src/lib/log.cc b/src/lib/log.cc
index 52dff2982..a3466538e 100644
--- a/src/lib/log.cc
+++ b/src/lib/log.cc
@@ -21,11 +21,12 @@
  *  @brief A very simple logging class.
  */
 
-#include <time.h>
-#include <cstdio>
 #include "log.h"
 #include "cross.h"
 #include "config.h"
+#include "safe_stringstream.h"
+#include <time.h>
+#include <cstdio>
 
 #include "i18n.h"
 
@@ -39,7 +40,7 @@ int const Log::TYPE_TIMING  = 0x8;
 Log::Log ()
 	: _types (0)
 {
-	Config::instance()->Changed.connect (boost::bind (&Log::config_changed, this));
+	_config_connection = Config::instance()->Changed.connect (boost::bind (&Log::config_changed, this));
 	config_changed ();
 }
 
@@ -63,7 +64,7 @@ Log::log (string message, int type)
 	time (&t);
 	string a = ctime (&t);
 
-	stringstream s;
+	SafeStringStream s;
 	s << a.substr (0, a.length() - 1) << N_(": ");
 
 	if (type & TYPE_ERROR) {
@@ -90,7 +91,7 @@ Log::microsecond_log (string m, int t)
 	struct timeval tv;
 	gettimeofday (&tv, 0);
 
-	stringstream s;
+	SafeStringStream s;
 	s << tv.tv_sec << N_(":") << tv.tv_usec << N_(" ") << m;
 	do_log (s.str ());
 }	
@@ -122,3 +123,45 @@ FileLog::do_log (string m)
 	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;
+}