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diff --git a/ucoo/utils/trace.cc b/ucoo/utils/trace.cc
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+// ucoolib - Microcontroller object oriented library. {{{
+//
+// Copyright (C) 2016 Nicolas Schodet
+//
+// Permission is hereby granted, free of charge, to any person obtaining a
+// copy of this software and associated documentation files (the "Software"),
+// to deal in the Software without restriction, including without limitation
+// the rights to use, copy, modify, merge, publish, distribute, sublicense,
+// and/or sell copies of the Software, and to permit persons to whom the
+// Software is furnished to do so, subject to the following conditions:
+//
+// The above copyright notice and this permission notice shall be included in
+// all copies or substantial portions of the Software.
+//
+// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
+// FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
+// DEALINGS IN THE SOFTWARE.
+//
+// }}}
+#include "ucoo/utils/trace.hh"
+#include <cstring>
+
+namespace ucoo {
+
+void
+TraceRegistry::register_trace_buffer (TraceBufferBase &b)
+{
+ TraceRegistry &self = get_instance ();
+ b.next_ = self.first;
+ self.first = &b;
+}
+
+bool
+TraceRegistry::dump_all (std::function<bool (const char *str, int str_size)>
+ dump_callback)
+{
+ return dump (nullptr, dump_callback);
+}
+
+bool
+TraceRegistry::dump (const char *name,
+ std::function<bool (const char *str, int str_size)>
+ dump_callback)
+{
+ bool ok = true;
+ TraceRegistry &self = get_instance ();
+ TraceBufferBase *b = self.first;
+ while (b)
+ {
+ if (!name || std::strcmp (name, b->name_) == 0)
+ {
+ {
+ char buf[128];
+ int r = snprintf (buf, sizeof (buf) - 1, "---[%s]---", b->name_);
+ if (r >= static_cast<int> (sizeof (buf) - 1))
+ r = sizeof (buf) - 2;
+ buf[r++] = '\n';
+ buf[r++] = '\0';
+ ok = ok && dump_callback (buf, r);
+ }
+ ok = ok && b->dump (dump_callback);
+ }
+ b = b->next_;
+ }
+ return ok;
+}
+
+TraceRegistry &
+TraceRegistry::get_instance ()
+{
+ static TraceRegistry instance;
+ return instance;
+}
+
+} // namespace ucoo