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diff --git a/contrib/zkt/debug.h b/contrib/zkt/debug.h
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+/*****************************************************************
+**
+** @(#) debug.h -- macros for debug messages
+**
+** compile with cc -DDBG to activate
+**
+** Copyright (c) Jan 2005, Holger Zuleger HZnet. All rights reserved.
+**
+** This software is open source.
+**
+** 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 Holger Zuleger HZnet 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 REGENTS 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.
+**
+*****************************************************************/
+#ifndef DEBUG_H
+# define DEBUG_H
+
+# ifdef DBG
+# define dbg_line() fprintf (stderr, "DBG: %s(%d) reached\n", __FILE__, __LINE__)
+# define dbg_msg(msg) fprintf (stderr, "DBG: %s(%d) %s\n", __FILE__, __LINE__, msg)
+# define dbg_val0(text) fprintf (stderr, "DBG: %s(%d) %s", __FILE__, __LINE__, text)
+# define dbg_val1(fmt, var) dbg_val (fmt, var)
+# define dbg_val(fmt, var) fprintf (stderr, "DBG: %s(%d) " fmt, __FILE__, __LINE__, var)
+# define dbg_val2(fmt, v1, v2) fprintf (stderr, "DBG: %s(%d) " fmt, __FILE__, __LINE__, v1, v2)
+# define dbg_val3(fmt, v1, v2, v3) fprintf (stderr, "DBG: %s(%d) " fmt, __FILE__, __LINE__, v1, v2, v3)
+# define dbg_val4(fmt, v1, v2, v3, v4) fprintf (stderr, "DBG: %s(%d) " fmt, __FILE__, __LINE__, v1, v2, v3, v4)
+# define dbg_val5(fmt, v1, v2, v3, v4, v5) fprintf (stderr, "DBG: %s(%d) " fmt, __FILE__, __LINE__, v1, v2, v3, v4, v5)
+# define dbg_val6(fmt, v1, v2, v3, v4, v5, v6) fprintf (stderr, "DBG: %s(%d) " fmt, __FILE__, __LINE__, v1, v2, v3, v4, v5, v6)
+# else
+# define dbg_line()
+# define dbg_msg(msg)
+# define dbg_val0(text)
+# define dbg_val1(fmt, var)
+# define dbg_val(fmt, str)
+# define dbg_val2(fmt, v1, v2)
+# define dbg_val3(fmt, v1, v2, v3)
+# define dbg_val4(fmt, v1, v2, v3, v4)
+# define dbg_val5(fmt, v1, v2, v3, v4, v5)
+# define dbg_val6(fmt, v1, v2, v3, v4, v5, v6)
+# endif
+
+#endif