native xc8 eeprom_read and eeprom_write functions to support structures instead of char array (imagine storing all your data in bits and splitted bytes manually when c can do it by itself!)

eeprom.c

void readEE(void *var_struct, void *eeprom_struct, size_t struct_size)
{
    unsigned char *var_pointer = (unsigned char *)var_struct;
    unsigned char eeprom_pointer = (unsigned char)eeprom_struct;
    for (unsigned char i = 0; i < struct_size; i++)
    {
        // based on __eeread.c in xc8 library
        do
            CLRWDT();
#if _EEPROM_INT == _EEREG_INT
        while (EECON1bits.WR);
#elif _EEPROM_INT == _NVMREG_INT
        while (NVMCON1bits.WR);
#else
#error "Unknonwn EEPROM register interface"
#endif

        *var_pointer = EEPROM_READ(eeprom_pointer);
        var_pointer++;
        eeprom_pointer++;
    }
}

void writeEE(void *var_struct, void *eeprom_struct, size_t struct_size)
{
    unsigned char *var_pointer = (unsigned char *)var_struct;
    unsigned char eeprom_pointer = (unsigned char)eeprom_struct;
    for (unsigned char i = 0; i < struct_size; i++)
    {
        // based on __eewrite.c in xc8 library
        EEPROM_WRITE(eeprom_pointer, *var_pointer);
        var_pointer++;
        eeprom_pointer++;
    }
}

eeprom.h

#ifndef _EEPROM_H
#define _EEPROM_H

#include <xc.h>
#include <stddef.h>
#include "eeprom.c"

void readEE(void *var_struct, void *eeprom_struct, size_t struct_size);

void writeEE(void *var_struct, void *eeprom_struct, size_t struct_size);

#endif

main.c

#include "eeprom.h"

// create the eeprom data structure
struct eepromData_struct {
    unsigned bit0 : 1;
    unsigned bit1 : 1;
    unsigned char number0;
    unsigned short number1;
    unsigned bit2 : 1;
}

// create a pair of the same structure, one in eeprom and another in ram (a pair for each structure)
__eeprom struct eepromData_struct eepromData = {
    // you can also give a default value to the eeprom structure (this is the default behavior of xc.h)
    bit0 = 0,
    number1 = 1000,
};
struct eepromData_struct data;

void main(void)
{
    // read the data from eeprom
    readEE(&data, &eepromData, sizeof(data) /* or sizeof(eepromData) as they have the same size */);
    
    // modify the data in ram
    data.number0 = 80;
    
    // store the data in eeprom
    writeEE(&data, &eepromData, sizeof(data) /* or sizeof(eepromData) as they have the same size */);
}