1 files changed, 56 insertions, 0 deletions
diff --git a/src/trace.h b/src/trace.h
new file mode 100644
index 000000000..f4bdff88a
--- /dev/null
+++ b/src/trace.h
@@ -0,0 +1,56 @@
+/*
+ * Copyright (C) the libgit2 contributors. All rights reserved.
+ *
+ * This file is part of libgit2, distributed under the GNU GPL v2 with
+ * a Linking Exception. For full terms see the included COPYING file.
+ */
+#ifndef INCLUDE_trace_h__
+#define INCLUDE_trace_h__
+
+#include <stdarg.h>
+
+#include <git2/trace.h>
+#include "buffer.h"
+
+#ifdef GIT_TRACE
+
+struct git_trace_data {
+	git_trace_level_t level;
+	git_trace_callback callback;
+};
+
+extern struct git_trace_data git_trace__data;
+
+GIT_INLINE(void) git_trace__write_fmt(
+	git_trace_level_t level,
+	const char *fmt, ...)
+{
+	git_trace_callback callback = git_trace__data.callback;	
+	git_buf message = GIT_BUF_INIT;
+	va_list ap;
+		
+	va_start(ap, fmt);
+	git_buf_vprintf(&message, fmt, ap);
+	va_end(ap);
+		
+	callback(level, git_buf_cstr(&message));
+
+	git_buf_free(&message);
+}
+
+#define git_trace_level()		(git_trace__data.level)
+#define git_trace(l, ...)		{ \
+									if (git_trace__data.level >= l && \
+										git_trace__data.callback != NULL) { \
+										git_trace__write_fmt(l, __VA_ARGS__); \
+									} \
+								}
+
+#else
+
+#define git_trace_level()		((void)0)
+#define git_trace(lvl, ...)		((void)0)
+
+#endif
+
+#endif