NEW FILE HEADER / COPYRIGHT FORMAT

[senf.git] / Utils / Exception.cc

diff --git a/Utils/Exception.cc b/Utils/Exception.cc
index 80b6c98..77f4548 100644 (file)
--- a/Utils/Exception.cc
+++ b/Utils/Exception.cc
@@ -1,9 +1,9 @@
 // $Id$
 //
 // Copyright (C) 2006
-// Fraunhofer Institut fuer offene Kommunikationssysteme (FOKUS)
-// Kompetenzzentrum fuer Satelitenkommunikation (SatCom)
-//     Stefan Bund <stefan.bund@fokus.fraunhofer.de>
+// Fraunhofer Institute for Open Communication Systems (FOKUS) 
+// Competence Center NETwork research (NET), St. Augustin, GERMANY 
+//     Stefan Bund <g0dil@berlios.de>
 //
 // This program is free software; you can redistribute it and/or modify
 // it under the terms of the GNU General Public License as published by
@@ -33,22 +33,38 @@
 #define prefix_
 ///////////////////////////////cc.p////////////////////////////////////////
 
-prefix_ void senf::SystemException::init()
+prefix_ void senf::throwErrno(std::string const & where, int code)
 {
-    // We normallyl don't want to consume memory in an exception,
-    // however all other solutions to format the message are terribly
-    // ugly (since thay must use a static and shared buffer ...)
-    std::stringstream s;
-    if (where)
-        s << where << ": ";
-    s << "(" << err << ") " << std::strerror(err);
-    buffer_ = s.str();
-}
+#ifndef SENF_NO_ERRNOEXC
+    switch (code) {
 
-prefix_ char const * senf::SystemException::what()
-    const throw()
-{
-    return buffer_.c_str();
+    // BOOST_PP_REPEAT is limited to 256 repetitions. The max errno value I found in any header file
+    // was somewhere around 530 or so. I assume going to 1024 will be good enough. This explicit
+    // code will be optimized into a jump table by g++ (which is more efficient than trying to do
+    // the table oneself)
+
+#   define ExceptionCase(z, n, data) case n: throw ErrnoException<n>(where);
+    BOOST_PP_REPEAT(256, ExceptionCase, _) ;
+#   undef ExceptionCase
+
+#   define ExceptionCase(z, n, data) case 256+n: throw ErrnoException<256+n>(where);
+    BOOST_PP_REPEAT(256, ExceptionCase, _) ;
+#   undef ExceptionCase
+
+#   define ExceptionCase(z, n, data) case 512+n: throw ErrnoException<512+n>(where);
+    BOOST_PP_REPEAT(256, ExceptionCase, _) ;
+#   undef ExceptionCase
+
+#   define ExceptionCase(z, n, data) case 768+n: throw ErrnoException<768+n>(where);
+    BOOST_PP_REPEAT(256, ExceptionCase, _) ;
+#   undef ExceptionCase
+
+    default:
+        throw SystemException(where, code);
+    }
+#else 
+    throw SystemException(where, code);
+#endif
 }
 
 ///////////////////////////////cc.e////////////////////////////////////////