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NIF based solution to interact with external programs with back-pressure

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exile c_src utils.h
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c_src/utils.h 

#ifndef EXILE_UTILS_H

#define EXILE_UTILS_H



#include "erl_nif.h"

#include <stdbool.h>



// #define DEBUG



#ifdef DEBUG

#define debug(...)                                                             \

  do {                                                                         \

    enif_fprintf(stderr, "%s:%d\t(fn \"%s\")  - ", __FILE__, __LINE__,         \

                 __func__);                                                    \

    enif_fprintf(stderr, __VA_ARGS__);                                         \

    enif_fprintf(stderr, "\n");                                                \

  } while (0)

#define start_timing() ErlNifTime __start = enif_monotonic_time(ERL_NIF_USEC)

#define elapsed_microseconds() (enif_monotonic_time(ERL_NIF_USEC) - __start)

#else

#define debug(...)

#define start_timing()

#define elapsed_microseconds() 0

#endif



#define error(...)                                                             \

  do {                                                                         \

    enif_fprintf(stderr, "%s:%d\t(fn: \"%s\")  - ", __FILE__, __LINE__,        \

                 __func__);                                                    \

    enif_fprintf(stderr, __VA_ARGS__);                                         \

    enif_fprintf(stderr, "\n");                                                \

  } while (0)



#define ASSERT_ARGC(argc, count)                                               \

  if (argc != count) {                                                         \

    error("number of arguments must be %d", count);                            \

    return enif_make_badarg(env);                                              \

  }



#endif