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diff --git a/utils/format/exceptions.cpp b/utils/format/exceptions.cpp
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+// Copyright 2010 The Kyua Authors.
+// 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 Google Inc. 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.
+
+#include "utils/format/exceptions.hpp"
+
+using utils::format::bad_format_error;
+using utils::format::error;
+using utils::format::extra_args_error;
+
+
+/// Constructs a new error with a plain-text message.
+///
+/// \param message The plain-text error message.
+error::error(const std::string& message) :
+    std::runtime_error(message)
+{
+}
+
+
+/// Destructor for the error.
+error::~error(void) throw()
+{
+}
+
+
+/// Constructs a new bad_format_error.
+///
+/// \param format_ The invalid format string.
+/// \param message Description of the error in the format string.
+bad_format_error::bad_format_error(const std::string& format_,
+                                   const std::string& message) :
+    error("Invalid formatting string '" + format_ + "': " + message),
+    _format(format_)
+{
+}
+
+
+/// Destructor for the error.
+bad_format_error::~bad_format_error(void) throw()
+{
+}
+
+
+/// \return The format string that caused the error.
+const std::string&
+bad_format_error::format(void) const
+{
+    return _format;
+}
+
+
+/// Constructs a new extra_args_error.
+///
+/// \param format_ The format string.
+/// \param arg_ The first extra argument passed to the format string.
+extra_args_error::extra_args_error(const std::string& format_,
+                                   const std::string& arg_) :
+    error("Not enough fields in formatting string '" + format_ + "' to place "
+          "argument '" + arg_ + "'"),
+    _format(format_),
+    _arg(arg_)
+{
+}
+
+
+/// Destructor for the error.
+extra_args_error::~extra_args_error(void) throw()
+{
+}
+
+
+/// \return The format string that was passed too many arguments.
+const std::string&
+extra_args_error::format(void) const
+{
+    return _format;
+}
+
+
+/// \return The first argument that caused the error.
+const std::string&
+extra_args_error::arg(void) const
+{
+    return _arg;
+}