Add postgres implementation of tile_for_point function.

db/functions/Makefile

@@ -12,17 +12,20 @@ all: libmyosm.so libpgosm.so
 clean:
 	$(RM) *.so *.o
 
-libmyosm.so: quadtile.o maptile-mysql.o
+libmyosm.so: quadtile-mysql.o maptile-mysql.o
-	cc ${LDFLAGS} -o libmyosm.so quadtile.o maptile-mysql.o
+	cc ${LDFLAGS} -o libmyosm.so quadtile-mysql.o maptile-mysql.o
 
-libpgosm.so: maptile-pgsql.o
+libpgosm.so: quadtile-pgsql.o maptile-pgsql.o
-	cc ${LDFLAGS} -o libpgosm.so maptile-pgsql.o
+	cc ${LDFLAGS} -o libpgosm.so quadtile-pgsql.o maptile-pgsql.o
 
-quadtile.o: quadtile.c ${QTDIR}/quad_tile.h
+quadtile-mysql.o: quadtile.c ${QTDIR}/quad_tile.h
-	cc `mysql_config --include` -I${QTDIR} -fPIC -O3 -c -o quadtile.o quadtile.c
+	cc `mysql_config --include` -I${QTDIR} -fPIC -O3 -DUSE_MYSQL -c -o quadtile-mysql.o quadtile.c
+
+quadtile-pgsql.o: quadtile.c ${QTDIR}/quad_tile.h
+	cc -I `pg_config --includedir-server` -I${QTDIR} -fPIC -O3 -DUSE_PGSQL -c -o quadtile-pgsql.o quadtile.c
 
 maptile-mysql.o: maptile.c
 	cc `mysql_config --include` -fPIC -O3 -DUSE_MYSQL -c -o maptile-mysql.o maptile.c
 
 maptile-pgsql.o: maptile.c
-	cc -I `pg_config --includedir-server` -O3 -fPIC -DUSE_PGSQL -c -o maptile-pgsql.o maptile.c
+	cc -I `pg_config --includedir-server` -fPIC -O3 -DUSE_PGSQL -c -o maptile-pgsql.o maptile.c

db/functions/maptile.c

@@ -61,6 +61,10 @@ long long maptile_for_point(UDF_INIT *initid, UDF_ARGS *args, char *is_null, cha
 #endif
 
 #ifdef USE_PGSQL
+#ifdef USE_MYSQL
+#error ONLY one of USE_MYSQL and USE_PGSQL should be defined
+#endif
+
 #include <postgres.h>
 #include <fmgr.h>
 

db/functions/quadtile.c

@@ -1,8 +1,21 @@
+#ifndef USE_MYSQL
+#ifndef USE_PGSQL
+#error One of USE_MYSQL or USE_PGSQL must be defined
+#endif
+#endif
+
+#include <math.h>
+#include <quad_tile.h>
+
+#ifdef USE_MYSQL
+#ifdef USE_PGSQL
+#error ONLY one of USE_MYSQL and USE_PGSQL should be defined
+#endif
+
 #include <my_global.h>
 #include <my_sys.h>
 #include <m_string.h>
 #include <mysql.h>
-#include <quad_tile.h>
 
 my_bool tile_for_point_init(UDF_INIT *initid, UDF_ARGS *args, char *message)
 {
@@ -29,3 +42,35 @@ long long tile_for_point(UDF_INIT *initid, UDF_ARGS *args, char *is_null, char *
 
    return xy2tile(lon2x(lon / 10000000.0), lat2y(lat / 10000000.0));
 }
+#endif
+
+#ifdef USE_PGSQL
+#ifdef USE_MYSQL
+#error ONLY one of USE_MYSQL and USE_PGSQL should be defined
+#endif
+
+#include <postgres.h>
+#include <fmgr.h>
+
+Datum
+tile_for_point(PG_FUNCTION_ARGS)
+{
+  double lat = PG_GETARG_INT32(0) / 10000000.0;
+  double lon = PG_GETARG_INT32(1) / 10000000.0;
+
+  PG_RETURN_INT64(xy2tile(lon2x(lon), lat2y(lat)));
+}
+
+PG_FUNCTION_INFO_V1(tile_for_point);
+
+/*
+ * To bind this into PGSQL, try something like:
+ *
+ * CREATE FUNCTION tile_for_point(int4, int4) RETURNS int8
+ *  AS '/path/to/rails-port/db/functions/libpgosm', 'tile_for_point'
+ *  LANGUAGE C STRICT;
+ *
+ * (without all the *s)
+ */
+
+#endif