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/*
* %CopyrightBegin%
*
* Copyright Ericsson AB 2010. All Rights Reserved.
*
* The contents of this file are subject to the Erlang Public License,
* Version 1.1, (the "License"); you may not use this file except in
* compliance with the License. You should have received a copy of the
* Erlang Public License along with this software. If not, it can be
* retrieved online at http://www.erlang.org/.
*
* Software distributed under the License is distributed on an "AS IS"
* basis, WITHOUT WARRANTY OF ANY KIND, either express or implied. See
* the License for the specific language governing rights and limitations
* under the License.
*
* %CopyrightEnd%
*/
/*
* Purpose: Simple example of NIFs using resource objects to implement functions
* for matrix calculations.
*/
#include "erl_nif.h"
#include <stddef.h>
#include <assert.h>
typedef struct
{
unsigned nrows;
unsigned ncols;
double* data;
}Matrix;
#define POS(MX, ROW, COL) ((MX)->data[(ROW)* (MX)->ncols + (COL)])
static int get_number(ErlNifEnv* env, ERL_NIF_TERM term, double* dp);
static Matrix* alloc_matrix(ErlNifEnv* env, unsigned nrows, unsigned ncols);
static void matrix_dtor(ErlNifEnv* env, void* obj);
static ErlNifResourceType* resource_type = NULL;
static int load(ErlNifEnv* env, void** priv_data, ERL_NIF_TERM load_info)
{
ErlNifResourceType* rt = enif_open_resource_type(env, NULL,
"matrix_nif_example",
matrix_dtor,
ERL_NIF_RT_CREATE, NULL);
if (rt == NULL) {
return -1;
}
assert(resource_type == NULL);
resource_type = rt;
return 0;
}
static ERL_NIF_TERM create(ErlNifEnv* env, int argc, const ERL_NIF_TERM argv[])
{
/* create(Nrows, Ncolumns, [[first row],[second row],...,[last row]]) -> Matrix */
unsigned nrows, ncols;
unsigned i, j;
ERL_NIF_TERM list, row, ret;
Matrix* mx = NULL;
if (!enif_get_uint(env, argv[0], &nrows) || nrows < 1 ||
!enif_get_uint(env, argv[1], &ncols) || ncols < 1) {
goto badarg;
}
mx = alloc_matrix(env, nrows, ncols);
list = argv[2];
for (i = 0; i<nrows; i++) {
if (!enif_get_list_cell(env, list, &row, &list)) {
goto badarg;
}
for (j = 0; j<ncols; j++) {
ERL_NIF_TERM v;
if (!enif_get_list_cell(env, row, &v, &row) ||
!get_number(env, v, &POS(mx,i,j))) {
goto badarg;
}
}
if (!enif_is_empty_list(env, row)) {
goto badarg;
}
}
if (!enif_is_empty_list(env, list)) {
goto badarg;
}
ret = enif_make_resource(env, mx);
enif_release_resource(mx);
return ret;
badarg:
if (mx != NULL) {
enif_release_resource(mx);
}
return enif_make_badarg(env);
}
static ERL_NIF_TERM pos(ErlNifEnv* env, int argc, const ERL_NIF_TERM argv[])
{
/* pos(Matrix, Row, Column) -> float() */
Matrix* mx;
unsigned i, j;
if (!enif_get_resource(env, argv[0], resource_type, (void**)&mx) ||
!enif_get_uint(env, argv[1], &i) || (--i >= mx->nrows) ||
!enif_get_uint(env, argv[2], &j) || (--j >= mx->ncols)) {
return enif_make_badarg(env);
}
return enif_make_double(env, POS(mx, i,j));
}
static ERL_NIF_TERM add(ErlNifEnv* env, int argc, const ERL_NIF_TERM argv[])
{
/* add(Matrix_A, Matrix_B) -> Matrix_Sum */
unsigned i, j;
ERL_NIF_TERM ret;
Matrix* mxA = NULL;
Matrix* mxB = NULL;
Matrix* mxS = NULL;
if (!enif_get_resource(env, argv[0], resource_type, (void**)&mxA) ||
!enif_get_resource(env, argv[1], resource_type, (void**)&mxB) ||
mxA->nrows != mxB->nrows ||
mxB->ncols != mxB->ncols) {
return enif_make_badarg(env);
}
mxS = alloc_matrix(env, mxA->nrows, mxA->ncols);
for (i = 0; i < mxA->nrows; i++) {
for (j = 0; j < mxA->ncols; j++) {
POS(mxS, i, j) = POS(mxA, i, j) + POS(mxB, i, j);
}
}
ret = enif_make_resource(env, mxS);
enif_release_resource(mxS);
return ret;
}
static ERL_NIF_TERM size_of(ErlNifEnv* env, int argc, const ERL_NIF_TERM argv[])
{
/* size(Matrix) -> {Nrows, Ncols} */
Matrix* mx;
if (!enif_get_resource(env, argv[0], resource_type, (void**)&mx)) {
return enif_make_badarg(env);
}
return enif_make_tuple2(env, enif_make_uint(env, mx->nrows),
enif_make_uint(env, mx->ncols));
}
static ERL_NIF_TERM to_term(ErlNifEnv* env, int argc, const ERL_NIF_TERM argv[])
{
/* to_term(Matrix) -> [[first row], [second row], ...,[last row]] */
unsigned i, j;
ERL_NIF_TERM res;
Matrix* mx = NULL;
if (!enif_get_resource(env, argv[0], resource_type, (void**)&mx)) {
return enif_make_badarg(env);
}
res = enif_make_list(env, 0);
for (i = mx->nrows; i-- > 0; ) {
ERL_NIF_TERM row = enif_make_list(env, 0);
for (j = mx->ncols; j-- > 0; ) {
row = enif_make_list_cell(env, enif_make_double(env, POS(mx,i,j)),
row);
}
res = enif_make_list_cell(env, row, res);
}
return res;
}
static int get_number(ErlNifEnv* env, ERL_NIF_TERM term, double* dp)
{
long i;
return enif_get_double(env, term, dp) ||
(enif_get_long(env, term, &i) && (*dp=(double)i, 1));
}
static Matrix* alloc_matrix(ErlNifEnv* env, unsigned nrows, unsigned ncols)
{
Matrix* mx = enif_alloc_resource(resource_type, sizeof(Matrix));
mx->nrows = nrows;
mx->ncols = ncols;
mx->data = enif_alloc(nrows*ncols*sizeof(double));
return mx;
}
static void matrix_dtor(ErlNifEnv* env, void* obj)
{
Matrix* mx = (Matrix*) obj;
enif_free(mx->data);
mx->data = NULL;
}
static ErlNifFunc nif_funcs[] =
{
{"create", 3, create},
{"pos", 3, pos},
{"add", 2, add},
{"size_of", 1, size_of},
{"to_term", 1, to_term}
};
ERL_NIF_INIT(matrix_nif,nif_funcs,load,NULL,NULL,NULL);
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