configulator/include/configulator.h

#ifndef __CONFIGULATOR_H__
#define __CONFIGULATOR_H__

#include <stdint.h>

#define CFGLR_BACKENDS_MAX  (04)
#define CFGLR_ELEMENTS_MAX  (04)

typedef enum {
  CFGLR_DATATYPE_U8,
  CFGLR_DATATYPE_I8,
  CFGLR_DATATYPE_U16,
  CFGLR_DATATYPE_I16,
  CFGLR_DATATYPE_U32,
  CFGLR_DATATYPE_I32,
  CFGLR_DATATYPE_U64,
  CFGLR_DATATYPE_I64,
  CFGLR_DATATYPE_STR,
  CFGLR_DATATYPE_BIN,
} cfglr_datatype_e;

typedef void (*cfglr_read_callback)(const char *key, void *out);
typedef void (*cfglr_write_callback)(const char *key, void *valoue, uint8_t length);

typedef struct {
  cfglr_read_callback read;
  cfglr_write_callback write;
} cfglr_data_handler_t;

typedef struct {
  const char *key;
  uint8_t dirty;
  cfglr_datatype_e datatype;
  void *default_data;
  void *data;
} cfglr_element_t;

#define CFGLR_ELEMENT(KEY, TYPE, DEFAULT) (cfglr_element_t){\
  .key = KEY,\
  .dirty = 1,\
  .default_data = (void*)DEFAULT,\
  .datatype = TYPE\
}

#define CFGLR_ELEMENT_U8(KEY, DEFAULT) CFGLR_ELEMENT(KEY, CFGLR_DATATYPE_U8, DEFAULT)

typedef struct cfglr_backend cfglr_backend_t;
typedef struct cfglr_handle_struct cfglr_handle_t;

typedef void (*cfglr_backend_open_t)(cfglr_backend_t *backend, cfglr_handle_t *handle);
typedef void (*cfglr_backend_close_t)(cfglr_backend_t *backend, cfglr_handle_t *handle);
typedef void (*cfglr_backend_get_t)(cfglr_backend_t *backend, cfglr_element_t *element, cfglr_handle_t *handle);

struct cfglr_backend {
  cfglr_backend_open_t open;
  cfglr_backend_close_t close;
  cfglr_backend_get_t get;
  void *handle;
};

#define CFGLR_BACKEND(OPEN, CLOSE) {\
  .open = OPEN,\
  .close = CLOSE,\
}

struct cfglr_handle_struct {
  const char *namespace;
  uint8_t store_defaults;
  cfglr_backend_t backends[CFGLR_BACKENDS_MAX];
  cfglr_element_t elements[CFGLR_ELEMENTS_MAX];
};

uint8_t cfglr_init(cfglr_handle_t *handle);
uint8_t cfglr_fetch_data(cfglr_backend_t *backend, cfglr_element_t *element, cfglr_handle_t *handler);

#include "cfglr_nvs.h"

#endif//__CONFIGULATOR_H__