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

#include <flash.h>
#include <macros.h>

#include <fs/block.h>

int block_is_erased(struct flash_dev *dev, uint32_t addr, uint32_t len)
{
	char buf[32], cmp[32];
	size_t count;

	memset(cmp, 0xff, sizeof cmp);

	for (; len; addr += count, len -= count) {
		count = min(len, sizeof buf);

		if (flash_read(dev, addr, buf, count) < 0)
			return -1;

		if (memcmp(buf, cmp, count) != 0)
			return -1;
	}

	return 0;
}