From c2f77d08fb15feb5f0f5826c55fa525f3659d986 Mon Sep 17 00:00:00 2001
From: Matthias Andreas Benkard <code@mail.matthias.benkard.de>
Date: Wed, 7 Dec 2011 20:27:10 +0100
Subject: Add the option of configuring the BPT key and bitmask sizes.

---
 Makefile                  | 13 ++++++++++++-
 bitmapped_patricia_tree.c |  3 ++-
 bitmapped_patricia_tree.h |  5 +++++
 configure                 | 25 +++++++++++++++++++++++++
 4 files changed, 44 insertions(+), 2 deletions(-)
 create mode 100755 configure

diff --git a/Makefile b/Makefile
index 53892cd..26af52a 100644
--- a/Makefile
+++ b/Makefile
@@ -1,5 +1,6 @@
 RM_F = rm -f
-CFLAGS = -std=c99 -Wall -pedantic -ggdb -g -DUSE_TERMIOS
+ADDITIONAL_CFLAGS = -DCHUNK_LENGTH=6 -DKEY_LENGTH=64 -DOFFSET_MASK=63 -DMAX_CHUNKS=11 -DLAST_CHUNK_LENGTH=4 -DBPT_EXPLICIT_CONFIGURATION -DBPT_KEY_T=intptr_t -DBPT_KEY_BITMASK_T=int64_t
+CFLAGS = -std=c99 -Wall -pedantic -ggdb -g -DUSE_TERMIOS $(ADDITIONAL_CFLAGS)
 LIBTOOL = libtool
 LDFLAGS = -lc
 CC = clang
@@ -15,6 +16,10 @@ bpttest_C_SOURCES = bpt_test.c
 bpttest_OBJECTS = $(patsubst %.c,%.o,$(bpttest_C_SOURCES))
 bpttest_TARGET = bpt_test
 
+config_C_SOURCES = config.c
+config_OBJECTS = $(patsubst %.c,%.o,$(config_C_SOURCES))
+config_TARGET = config
+
 .PHONY: all clean
 
 all: $(mulklib_TARGET) $(bpttest_TARGET)
@@ -24,6 +29,8 @@ clean:
 	$(RM_F) $(mulklib_TARGET)
 	$(RM_F) $(bpttest_OBJECTS)
 	$(RM_F) $(bpttest_TARGET)
+	$(RM_F) $(config_OBJECTS)
+	$(RM_F) $(config_TARGET)
 
 
 $(mulklib_TARGET): $(mulklib_OBJECTS)
@@ -32,5 +39,9 @@ $(mulklib_TARGET): $(mulklib_OBJECTS)
 $(bpttest_TARGET): $(bpttest_OBJECTS) $(mulklib_TARGET)
 	$(CC) -o $@ $+
 
+$(config_TARGET): $(config_OBJECTS)
+	$(CC) -o $@ $+
+
 bitmapped_patricia_tree.o: bitmapped_patricia_tree.c bitmapped_patricia_tree.h
 bpt_test.o: bpt_test.c bitmapped_patricia_tree.h
+config.o: config.c
diff --git a/bitmapped_patricia_tree.c b/bitmapped_patricia_tree.c
index 79ac076..543ffb8 100644
--- a/bitmapped_patricia_tree.c
+++ b/bitmapped_patricia_tree.c
@@ -49,12 +49,13 @@
 
 #include "bitmapped_patricia_tree.h"
 
+#ifndef BPT_EXPLICIT_CONFIGURATION
 #define CHUNK_LENGTH 5
 #define KEY_LENGTH 32
 #define OFFSET_MASK 0x1ffff  //((1 << chunk_length) - 1)
 #define MAX_CHUNKS 7         //key_length / chunk_length + ((key_length % chunk_length == 0) ? 0 : 1)
 #define LAST_CHUNK_LENGTH 2  //key_length - ((max_chunks - 1) * chunk_length)
-
+#endif  //!BPT_EXPLICIT_CONFIGURATION
 
 typedef struct bpt_nonempty *bpt_nonempty_t;
 typedef struct bpt_node *bpt_node_t;
diff --git a/bitmapped_patricia_tree.h b/bitmapped_patricia_tree.h
index b1a3e32..f1d65c3 100644
--- a/bitmapped_patricia_tree.h
+++ b/bitmapped_patricia_tree.h
@@ -32,8 +32,13 @@ extern "C" {
 
 #define BPT_ENABLE_DEALLOC_HOOKS 1
 
+#ifdef BPT_EXPLICIT_CONFIGURATION
+typedef BPT_KEY_T         bpt_key_t;
+typedef BPT_KEY_BITMASK_T bpt_key_bitmask_t;
+#else
 typedef int32_t bpt_key_t;
 typedef int32_t bpt_key_bitmask_t;
+#endif  //!BPT_EXPLICIT_CONFIGURATION
 
 enum bpt_tag {
   BPT_LEAF,
diff --git a/configure b/configure
new file mode 100755
index 0000000..7e9d15e
--- /dev/null
+++ b/configure
@@ -0,0 +1,25 @@
+#! /bin/sh
+
+if [ sed --version >/dev/null 2>&1 ]; then
+  GSED=sed
+else
+  GSED=gsed
+fi
+
+if [ "$#" -lt 2 ]; then
+  echo "Usage:"
+  echo "  ./configure <bpt_key_t> <bpt_key_bitmask_t>"
+  echo
+  echo "Example:"
+  echo "  ./configure intptr_t int64_t"
+  exit 2
+fi
+
+KEY_T=$1
+BITMASK_T=$2
+
+make config ADDITIONAL_CFLAGS="-DBPT_KEY_T=$KEY_T -DBPT_KEY_BITMASK_T=$BITMASK_T"
+CONFIG_CFLAGS=$(./config)
+make clean
+
+"$GSED" --in-place "s/ADDITIONAL_CFLAGS =.*\$/ADDITIONAL_CFLAGS = $CONFIG_CFLAGS -DBPT_EXPLICIT_CONFIGURATION -DBPT_KEY_T=$KEY_T -DBPT_KEY_BITMASK_T=$BITMASK_T/" Makefile
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