int remap_struct(unsigned int gtypes_nr[], unsigned int ftypes_nr[],
		 void *ps, unsigned int f_size, unsigned int g_size, size_t b_size)
{
	int d;
	size_t n;

	/* Sanity check */
	if (MAP_SIZE(ftypes_nr) > f_size)
		return -1;

	/* Remap [unsigned] long fields */
	d = gtypes_nr[0] - ftypes_nr[0];
	if (d) {
		if (ftypes_nr[0] * ULL_ALIGNMENT_WIDTH < ftypes_nr[0])
			/* Overflow */
			return -1;

		n = MINIMUM(f_size - ftypes_nr[0] * ULL_ALIGNMENT_WIDTH,
			    g_size - gtypes_nr[0] * ULL_ALIGNMENT_WIDTH);
		if ((ftypes_nr[0] * ULL_ALIGNMENT_WIDTH >= b_size) ||
		    (gtypes_nr[0] * ULL_ALIGNMENT_WIDTH + n > b_size) ||
		    (ftypes_nr[0] * ULL_ALIGNMENT_WIDTH + n > b_size))
			return -1;

		memmove(((char *) ps) + gtypes_nr[0] * ULL_ALIGNMENT_WIDTH,
			((char *) ps) + ftypes_nr[0] * ULL_ALIGNMENT_WIDTH, n);
		if (d > 0) {
			memset(((char *) ps) + ftypes_nr[0] * ULL_ALIGNMENT_WIDTH,
			       0, d * ULL_ALIGNMENT_WIDTH);
		}
	}
	/* Remap [unsigned] int fields */
	d = gtypes_nr[1] - ftypes_nr[1];
	if (d) {
		if (gtypes_nr[0] * ULL_ALIGNMENT_WIDTH +
		    ftypes_nr[1] * UL_ALIGNMENT_WIDTH < ftypes_nr[1])
			/* Overflow */
			return -1;

		n = MINIMUM(f_size - ftypes_nr[0] * ULL_ALIGNMENT_WIDTH
				   - ftypes_nr[1] * UL_ALIGNMENT_WIDTH,
			    g_size - gtypes_nr[0] * ULL_ALIGNMENT_WIDTH
				   - gtypes_nr[1] * UL_ALIGNMENT_WIDTH);
		if ((gtypes_nr[0] * ULL_ALIGNMENT_WIDTH +
		     ftypes_nr[1] * UL_ALIGNMENT_WIDTH >= b_size) ||
		    (gtypes_nr[0] * ULL_ALIGNMENT_WIDTH +
		     gtypes_nr[1] * UL_ALIGNMENT_WIDTH + n > b_size) ||
		    (gtypes_nr[0] * ULL_ALIGNMENT_WIDTH +
		     ftypes_nr[1] * UL_ALIGNMENT_WIDTH + n > b_size))
			return -1;

		memmove(((char *) ps) + gtypes_nr[0] * ULL_ALIGNMENT_WIDTH
				      + gtypes_nr[1] * UL_ALIGNMENT_WIDTH,
			((char *) ps) + gtypes_nr[0] * ULL_ALIGNMENT_WIDTH
				      + ftypes_nr[1] * UL_ALIGNMENT_WIDTH, n);
		if (d > 0) {
			memset(((char *) ps) + gtypes_nr[0] * ULL_ALIGNMENT_WIDTH
					     + ftypes_nr[1] * UL_ALIGNMENT_WIDTH,
			       0, d * UL_ALIGNMENT_WIDTH);
		}
	}
	/* Remap possible fields (like strings of chars) following int fields */
	d = gtypes_nr[2] - ftypes_nr[2];
	if (d) {
		if (gtypes_nr[0] * ULL_ALIGNMENT_WIDTH +
		    gtypes_nr[1] * UL_ALIGNMENT_WIDTH +
		    ftypes_nr[2] * U_ALIGNMENT_WIDTH < ftypes_nr[2])
			/* Overflow */
			return -1;

		n = MINIMUM(f_size - ftypes_nr[0] * ULL_ALIGNMENT_WIDTH
				   - ftypes_nr[1] * UL_ALIGNMENT_WIDTH
				   - ftypes_nr[2] * U_ALIGNMENT_WIDTH,
			    g_size - gtypes_nr[0] * ULL_ALIGNMENT_WIDTH
				   - gtypes_nr[1] * UL_ALIGNMENT_WIDTH
				   - gtypes_nr[2] * U_ALIGNMENT_WIDTH);
		if ((gtypes_nr[0] * ULL_ALIGNMENT_WIDTH +
		     gtypes_nr[1] * UL_ALIGNMENT_WIDTH +
		     ftypes_nr[2] * U_ALIGNMENT_WIDTH >= b_size) ||
		    (gtypes_nr[0] * ULL_ALIGNMENT_WIDTH +
		     gtypes_nr[1] * UL_ALIGNMENT_WIDTH +
		     gtypes_nr[2] * U_ALIGNMENT_WIDTH + n > b_size) ||
		    (gtypes_nr[0] * ULL_ALIGNMENT_WIDTH +
		     gtypes_nr[1] * UL_ALIGNMENT_WIDTH +
		     ftypes_nr[2] * U_ALIGNMENT_WIDTH + n > b_size))
			return -1;

		memmove(((char *) ps) + gtypes_nr[0] * ULL_ALIGNMENT_WIDTH
				      + gtypes_nr[1] * UL_ALIGNMENT_WIDTH
				      + gtypes_nr[2] * U_ALIGNMENT_WIDTH,
			((char *) ps) + gtypes_nr[0] * ULL_ALIGNMENT_WIDTH
				      + gtypes_nr[1] * UL_ALIGNMENT_WIDTH
				      + ftypes_nr[2] * U_ALIGNMENT_WIDTH, n);
		if (d > 0) {
			memset(((char *) ps) + gtypes_nr[0] * ULL_ALIGNMENT_WIDTH
					     + gtypes_nr[1] * UL_ALIGNMENT_WIDTH
					     + ftypes_nr[2] * U_ALIGNMENT_WIDTH,
			       0, d * U_ALIGNMENT_WIDTH);
		}
	}
	return 0;
}