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circuits_gpio

2.0.0-pre.1
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Use GPIOs in Elixir

Retired package: Release invalid - Use v2.0.0 or later
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circuits_gpio c_src nif_utils.c
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c_src/nif_utils.c 

// SPDX-FileCopyrightText: 2018 Frank Hunleth, Mark Sebald, Matt Ludwigs

//

// SPDX-License-Identifier: Apache-2.0



#include "gpio_nif.h"



#include <string.h>



ERL_NIF_TERM make_ok_tuple(ErlNifEnv *env, ERL_NIF_TERM value)

{

    return enif_make_tuple2(env, atom_ok, value);

}



ERL_NIF_TERM make_error_tuple(ErlNifEnv *env, const char *reason)

{

    ERL_NIF_TERM reason_atom = enif_make_atom(env, reason);



    return enif_make_tuple2(env, atom_error, reason_atom);

}



ERL_NIF_TERM make_string_binary(ErlNifEnv *env, const char *str)

{

    ERL_NIF_TERM term;

    size_t len = strlen(str);

    unsigned char *data = enif_make_new_binary(env, len, &term);

    memcpy(data, str, len);

    return term;

}



int enif_get_boolean(ErlNifEnv *env, ERL_NIF_TERM term, bool *v)

{

    char buffer[16];

    if (enif_get_atom(env, term, buffer, sizeof(buffer), ERL_NIF_LATIN1) <= 0)

        return false;



    if (strcmp("false", buffer) == 0)

        *v = false;

    else

        *v = true;



    return true;

}