--- /dev/null
+/* -copyright-
+#-# Copyright © 2021 Eric Bina, Dave Black, TJ Phan,
+#-# Vincent Renardias, Willem Vermin
+#-#
+#-# 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.
+#-#
+*/
+// Macros P, R and I can be used as printf, but they attach the location of the
+// statement to the output
+// P and R for debugging
+// P : only active when DEBUG is defined
+// R : always active
+// I : meant for production
+#pragma once
+#include <stdio.h>
+#ifdef DEBUG
+#define P(...) do {printf ("%s: %d: ",__FILE__,__LINE__);printf(__VA_ARGS__);fflush(stdout);}while(0)
+#else
+#define P(...) {}
+#endif
+#define R(...) do {printf ("%s: %d: ",__FILE__,__LINE__);printf(__VA_ARGS__);fflush(stdout);} while(0)
+#define I(...) do {printf ("Xfishtank info: %s: %d: ",__FILE__,__LINE__);printf(__VA_ARGS__);fflush(stdout);} while(0)
+
+extern int counter;