diff --git a/data-raw/DATASET.R b/data-raw/DATASET.R
index a3f1369..4aef3a7 100644
--- a/data-raw/DATASET.R
+++ b/data-raw/DATASET.R
@@ -2,13 +2,32 @@
 
 ## Read `h3libapi.h` and write all 'inline' function defs to `init.c`
 
-# lines <- readLines("~/Documents/github/h3lib/inst/include/h3libapi.h")
-# fns <- lines[ grepl("inline ", lines) ]
-# fns <- gsub("inline ", "", fns)
-# fns <- gsub("\\(.*","",fns)
-# fns <- gsub(" ", " (*", fns)
-# fns <- paste0(fns, ");\n")
-# cat(fns)
+lines <- readLines("~/Documents/github/h3lib/inst/include/h3libapi.h")
+fns <- lines[ grepl("^inline ", lines) ]
+
+fns <- gsub("inline ", "", fns)
+
+args <- gsub(".*\\(","", fns)
+args <- trimws(gsub("\\) \\{", "", args))
+
+## Replace arugments (space, followed by arg, followed by comma)
+## with a comma
+args <- gsub(" \\w+,", ",", args)
+
+## remove final argument
+args <- gsub("\\w+$","", args)
+
+## put 'void' back in
+args[ nchar(args) == 0 ] <- "void"
+
+args <- trimws(args)
+
+types <- trimws(gsub("\\w+$","",fns))
+names <- trimws(gsub("^ {0, }\\w+ ", "", fns))
+
+## rebuild
+fns <- paste0(types, " (*", names, ")","(", args, ");\n")
+cat(fns)
 
 
 stations <- structure(list(stop_id = c("15351", "15353", "19827", "19828",
diff --git a/src/init.c b/src/init.c
index f76b363..cf58558 100644
--- a/src/init.c
+++ b/src/init.c
@@ -192,6 +192,79 @@ typedef struct {
   int j;  ///< j component
 } CoordIJ;
 
+H3Error (*latLngToCell)(const LatLng*, int, H3Index*);
+H3Error (*cellToLatLng)(H3Index, LatLng*);
+H3Error (*cellToBoundary)(H3Index, CellBoundary*);
+H3Error (*maxGridDiskSize)(int, int64_t*);
+H3Error (*gridDiskUnsafe)(H3Index, int, H3Index*);
+H3Error (*gridDiskDistancesUnsafe)(H3Index, int, H3Index*, int*);
+H3Error (*gridDiskDistancesSafe)(H3Index, int, H3Index*, int*);
+H3Error (*gridDisksUnsafe)(H3Index*, int, int, H3Index*);
+H3Error (*gridDisk)(H3Index, int, H3Index*);
+H3Error (*gridDiskDistances)(H3Index, int, H3Index*, int*);
+H3Error (*gridRingUnsafe)(H3Index, int, H3Index*);
+H3Error (*maxPolygonToCellsSize)(const GeoPolygon*, int, uint32_t, int64_t*);
+H3Error (*polygonToCells)(const GeoPolygon*, int, uint32_t, H3Index*);
+H3Error (*cellsToLinkedMultiPolygon)(const H3Index*, const int, LinkedGeoPolygon*);
+void (*destroyLinkedMultiPolygon)(LinkedGeoPolygon*);
+double (*degsToRads)(double);
+double (*radsToDegs)(double);
+double (*greatCircleDistanceRads)(const LatLng*, const LatLng*);
+double (*greatCircleDistanceKm)(const LatLng*, const LatLng*);
+double (*greatCircleDistanceM)(const LatLng*, const LatLng*);
+H3Error (*getHexagonAreaAvgKm2)(int, double*);
+H3Error (*getHexagonAreaAvgM2)(int, double*);
+H3Error (*cellAreaRads2)(H3Index, double*);
+H3Error (*cellAreaKm2)(H3Index, double*);
+H3Error (*cellAreaM2)(H3Index, double*);
+H3Error (*getHexagonEdgeLengthAvgKm)(int, double*);
+H3Error (*getHexagonEdgeLengthAvgM)(int, double*);
+H3Error (*edgeLengthRads)(H3Index, double*);
+H3Error (*edgeLengthKm)(H3Index, double*);
+H3Error (*edgeLengthM)(H3Index, double*);
+H3Error (*getNumCells)(int, int64_t*);
+int (*res0CellCount)(void);
+H3Error (*getRes0Cells)(H3Index*);
+int (*pentagonCount)(void);
+H3Error (*getPentagons)(int, H3Index*);
+int (*getResolution)(H3Index);
+int (*getBaseCellNumber)(H3Index);
+H3Error (*stringToH3)(const char*, H3Index*);
+int (*isValidCell)(H3Index);
+H3Error (*cellToParent)(H3Index, int, H3Index*);
+H3Error (*cellToChildrenSize)(H3Index, int, int64_t*);
+H3Error (*cellToChildren)(H3Index, int, H3Index*);
+H3Error (*cellToCenterChild)(H3Index, int, H3Index*);
+H3Error (*cellToChildPos)(H3Index, int, int64_t*);
+H3Error (*childPosToCell)(int64_t, H3Index, int, H3Index*);
+H3Error (*compactCells)(const H3Index*, H3Index*, const int64_t);
+H3Error (*uncompactCellsSize)(const H3Index*, const int64_t, const int, int64_t*);
+H3Error (*uncompactCells)(const H3Index*, const int64_t, H3Index*, const int64_t, const int);
+int (*isResClassIII)(H3Index);
+int (*isPentagon)(H3Index);
+H3Error (*maxFaceCount)(H3Index, int*);
+H3Error (*getIcosahedronFaces)(H3Index, int*);
+H3Error (*areNeighborCells)(H3Index, H3Index, int*);
+H3Error (*cellsToDirectedEdge)(H3Index, H3Index, H3Index*);
+int (*isValidDirectedEdge)(H3Index);
+H3Error (*getDirectedEdgeOrigin)(H3Index, H3Index*);
+H3Error (*getDirectedEdgeDestination)(H3Index, H3Index*);
+H3Error (*directedEdgeToCells)(H3Index, H3Index*);
+H3Error (*originToDirectedEdges)(H3Index, H3Index*);
+H3Error (*directedEdgeToBoundary)(H3Index, CellBoundary*);
+H3Error (*cellToVertex)(H3Index, int, H3Index*);
+H3Error (*cellToVertexes)(H3Index, H3Index*);
+H3Error (*vertexToLatLng)(H3Index, LatLng*);
+int (*isValidVertex)(H3Index);
+H3Error (*gridDistance)(H3Index, H3Index, int64_t*);
+H3Error (*gridPathCellsSize)(H3Index, H3Index, int64_t*);
+H3Error (*gridPathCells)(H3Index, H3Index, H3Index*);
+H3Error (*cellToLocalIj)(H3Index, H3Index, uint32_t, CoordIJ*);
+H3Error (*localIjToCell)(H3Index, const CoordIJ*, uint32_t, H3Index*);
+Direction (*directionForNeighbor)(H3Index, H3Index);
+void (*_geoToClosestFace)(const LatLng*, int*, double*);
+void (*h3lib_tests)(void);
+
 void attribute_visible R_init_h3r(DllInfo *info)
 {
   R_registerRoutines(info, NULL, callMethods, NULL, NULL);