#include <u.h>
#include <libc.h>

#include "block.h"

enum
{
	BlockSize = 4096,
};

int fd;

static void
blockinit(void)
{
	long i;
	uchar buf[BlockSize];

	for(i = 0; i < 255; i++){
		memset(buf, i, sizeof buf);
		if(pwrite(fd, buf, sizeof buf, i*BlockSize) != BlockSize)
			sysfatal("pwrite: %r");
	}
}

static void
blockcheck(void)
{
	long i;
	uchar buf[BlockSize*4];
	uchar cmp[BlockSize];

	if(blockread(fd, buf, BlockSize, 4, 0) != 4)
		sysfatal("blockread: %r");

	for(i = 0; i < 4; i++){
		memset(cmp, i, sizeof cmp);
		if(memcmp(buf+(i*BlockSize), cmp, BlockSize) != 0)
			sysfatal("block %ld mismatch", i);
	}
}

void
main(void)
{
	char *tmp;

	tmp = mktemp("/tmp/libblock-img.XXXX");
	fd = create(tmp, ORDWR|ORCLOSE, 0600);
	if(fd < 0)
		sysfatal("create %s: %r", tmp);

	blockinit();
	blockcheck();

	close(fd);

	exits(nil);
}