Using these set of macros (GetPtr and GetSinglePtr) it is possible to refactor your struct and still having the correct types for pointers. Eg: it may happen that a uint32_t field is changed to uint8_t, but in some places it is still referred as uint32_t *tmp = myStruct->x, causing troubles.

struct_field_ptr_type.c

#include <stdio.h>
#include <stddef.h>
#include <stdint.h>
#include <stdlib.h>
#include <string.h>

#define MyPtrTypeOf(TYPE, MEMBER) typeof(&((TYPE *)0)->MEMBER)
#define GetPtr(t, i, MEMBER) \
	MyPtrTypeOf(typeof(*t), MEMBER) MEMBER = \
	(MyPtrTypeOf(typeof(*t), MEMBER)) ((void *)(t + i) + offsetof(typeof(*t), MEMBER))
#define GetSinglePtr(t, MEMBER) GetPtr(&t, 0, MEMBER)

typedef struct {
	uint8_t x;
	double y;
	char *name;
} myS; 

int main(void) {
	myS s[10] = { 0 };
	
	myS t = { 0, 5.245, NULL };
	
	s[5].x = 12;
	s[7].name = strdup("Hello");
	
	/* Test Int */
	GetPtr(s, 5, x);
	printf("%d\n", *x);
	*x = 13;
	printf("%d\n", *x);
	
	/* Test Char* */
	GetPtr(s, 7, name);
	printf("%s\n", *name);
	free(*name);
	*name = strdup("World");
	printf("%s\n", *name);
	free(*name);
	
	GetSinglePtr(t, y);
	printf("%.3lf\n", *y);
	
	return 0;
}