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NIF based bindings for libvips

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vix c_src utils.c
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c_src/utils.c 

#include "utils.h"

#include <glib-object.h>

#include <stdbool.h>



ERL_NIF_TERM ATOM_OK;

ERL_NIF_TERM ATOM_ERROR;

ERL_NIF_TERM ATOM_NIL;

ERL_NIF_TERM ATOM_TRUE;

ERL_NIF_TERM ATOM_FALSE;



ERL_NIF_TERM make_ok(ErlNifEnv *env, ERL_NIF_TERM term) {

  return enif_make_tuple2(env, ATOM_OK, term);

}



ERL_NIF_TERM make_error(ErlNifEnv *env, const char *reason) {

  return enif_make_tuple2(env, ATOM_ERROR,

                          enif_make_string(env, reason, ERL_NIF_LATIN1));

}



ERL_NIF_TERM raise_exception(ErlNifEnv *env, const char *msg) {

  error(msg);

  return enif_raise_exception(env, enif_make_string(env, msg, ERL_NIF_LATIN1));

}



ERL_NIF_TERM raise_badarg(ErlNifEnv *env, const char *reason) {

  error("bad argument: %s", reason);

  return enif_make_badarg(env);

}



ERL_NIF_TERM make_atom(ErlNifEnv *env, const char *name) {

  ERL_NIF_TERM ret;

  if (enif_make_existing_atom(env, name, &ret, ERL_NIF_LATIN1)) {

    return ret;

  }

  return enif_make_atom(env, name);

}



VixResult vix_error(ErlNifEnv *env, const char *reason) {

  error(reason);

  return (VixResult){.is_success = false,

                     .result = enif_make_string(env, reason, ERL_NIF_LATIN1)};

}



VixResult vix_result(ERL_NIF_TERM term) {

  return (VixResult){.is_success = true, .result = term};

}



int utils_init(ErlNifEnv *env) {

  ATOM_OK = make_atom(env, "ok");

  ATOM_ERROR = make_atom(env, "error");

  ATOM_NIL = make_atom(env, "nil");

  ATOM_TRUE = make_atom(env, "true");

  ATOM_FALSE = make_atom(env, "false");



  return 0;

}



void notify_consumed_timeslice(ErlNifEnv *env, ErlNifTime start,

                               ErlNifTime stop) {

  ErlNifTime pct;



  pct = (ErlNifTime)((stop - start) / 10);

  if (pct > 100)

    pct = 100;

  else if (pct == 0)

    pct = 1;

  enif_consume_timeslice(env, pct);

}