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math library for metric sequences and binary arrays.
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c_src/hpts_nif.c
#include "erl_nif.h"
#include "mmath.h"
#include <math.h>
static int
load(ErlNifEnv* env, void** priv, ERL_NIF_TERM load_info)
{
return 0;
}
static int
upgrade(ErlNifEnv* env, void** priv, void** old_priv, ERL_NIF_TERM load_info)
{
return 0;
}
static ERL_NIF_TERM
values(ErlNifEnv* env, int argc, const ERL_NIF_TERM argv[])
{
ErlNifBinary a;
ERL_NIF_TERM r;
ErlNifSInt64* vs;
ErlNifSInt64* target;
unsigned count;
unsigned j = 0;
if (argc != 1)
return enif_make_badarg(env);
GET_BIN(0, a, count, vs);
if (count % 2)
return enif_make_badarg(env); // TODO return propper error
if (!(target = (ErlNifSInt64*) enif_make_new_binary(env, (count / 2) * sizeof(ErlNifSInt64), &r)))
return enif_make_badarg(env); // TODO return propper error
for (unsigned i = 0 ; i < count; i = i + 2) {
target[j] = vs[i];
j++;
}
return r;
}
static ERL_NIF_TERM
timestamps(ErlNifEnv* env, int argc, const ERL_NIF_TERM argv[])
{
ErlNifBinary a;
ERL_NIF_TERM r;
ErlNifSInt64* vs;
ErlNifSInt64* target;
unsigned count;
unsigned j = 0;
if (argc != 1)
return enif_make_badarg(env);
GET_BIN(0, a, count, vs);
if (count % 2)
return enif_make_badarg(env); // TODO return propper error
if (!(target = (ErlNifSInt64*) enif_make_new_binary(env, (count / 2) * sizeof(ErlNifSInt64), &r)))
return enif_make_badarg(env); // TODO return propper error
for (unsigned i = 1 ; i < count; i = i + 2) {
target[j] = vs[i];
j++;
}
return r;
}
static ErlNifFunc nif_funcs[] = {
/* {"from_list", 1, from_list}, */
/* {"to_list", 1, to_list}, */
{"values", 1, values},
{"timestamps", 1, timestamps}
};
// Initialize this NIF library.
//
// Args: (MODULE, ErlNifFunc funcs[], load, reload, upgrade, unload)
// Docs: http://erlang.org/doc/man/erl_nif.html#ERL_NIF_INIT
ERL_NIF_INIT(mmath_hpts, nif_funcs, &load, NULL, &upgrade, NULL);