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diff --git a/src/accum.h b/src/accum.h
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+/*
+ * Copyright (c) 2003-2009, John Wiegley.  All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ *
+ * - Redistributions of source code must retain the above copyright
+ *   notice, this list of conditions and the following disclaimer.
+ *
+ * - Redistributions in binary form must reproduce the above copyright
+ *   notice, this list of conditions and the following disclaimer in the
+ *   documentation and/or other materials provided with the distribution.
+ *
+ * - Neither the name of New Artisans LLC nor the names of its
+ *   contributors may be used to endorse or promote products derived from
+ *   this software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+ * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+ * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+ * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+ * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+ * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+ * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+ * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+ * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+
+/**
+ * @addtogroup util
+ */
+
+/**
+ * @file   accum.h
+ * @author John Wiegley
+ *
+ * @ingroup util
+ *
+ * @brief Brief
+ *
+ * Full.
+ */
+#ifndef _ACCUM_H
+#define _ACCUM_H
+
+namespace ledger {
+
+/**
+ * @brief Brief
+ *
+ * Full.
+ */
+class straccbuf : public std::streambuf
+{
+protected:
+  std::string str;		// accumulator
+  std::size_t index;
+
+public:
+  straccbuf() : index(0) {}
+
+protected:
+  virtual std::streamsize xsputn(const char * s, std::streamsize num);
+
+  friend class straccstream;
+};
+
+/**
+ * @brief Brief
+ *
+ * Full.
+ */
+class straccstream : public std::ostream
+{
+protected:
+  straccbuf buf;
+
+public:
+  straccstream() : std::ostream(0) {
+    rdbuf(&buf);
+  }
+
+  void clear() {
+    buf.str.clear();
+    buf.index = 0;
+  }
+
+  std::string str() const {
+    return buf.str;
+  }
+};
+
+#define ACCUM(obj) (static_cast<straccstream&>(obj).str())
+
+} // namespace ledger
+
+#endif // _ACCUM_H