t_block *block_copy(t_block *block)
{
t_context *C=ctx_get();
scene_store(C->scene,1);
t_node *clone_node = block_make(block->id.name,block->type);
t_block *clone_block = clone_node->data;
clone_block->block_state.draw_outline = block->block_state.draw_outline;
_add_block(C,clone_block);
vcp(clone_block->pos,block->pos);
t_link *l;
t_brick *b;
for(l=block->bricks->first;l;l=l->next)
{
b=l->data;
brick_copy(clone_block,b);
}
scene_store(C->scene,0);
return clone_block;
}
t_block *block_clone(t_block *block)
{
t_context *C=ctx_get();
C->scene->store=1;
t_node *clone_node=block_make(block->name,block->type);
t_block *clone_block=clone_node->data;
clone_block->state.draw_outline = block->state.draw_outline;
_add_block(C,clone_block);
t_link *l;
t_brick *b;
for(l=block->bricks->first;l;l=l->next)
{
b=l->data;
brick_clone(clone_block,b);
}
C->scene->store=0;
return clone_block;
}
static int
add_block(ospfs_inode_t *oi)
{
// current number of blocks in file
uint32_t n = ospfs_size2nblocks(oi->oi_size);
int32_t next_block = n + 1;
int32_t retval = -ENOSPC;
uint32_t block_no = 0;
uint32_t *ptr;
// keep track of allocations to free in case of -ENOSPC
uint32_t allocated[2] = { 0, 0 };
/* EXERCISE: Your code here */
if (0 < next_block && next_block <= OSPFS_NDIRECT) {
if (_add_block(&oi->oi_direct[next_block - 1])) {
retval = 0;
}
goto out;
}
// The block to be allocated has to be in indirect or indirect2
next_block -= OSPFS_NDIRECT;
if (0 < next_block && next_block <= OSPFS_NINDIRECT) {
if (!oi->oi_indirect) {
if (!(allocated[0] = _add_block(&oi->oi_indirect))) {
goto out;
}
}
ptr = ospfs_block(oi->oi_indirect);
if (!_add_block(&ptr[next_block - 1])) {
if (allocated[0]) {
free_block(allocated[0]);
oi->oi_indirect = 0;
}
goto out;
}
retval = 0;
goto out;
}
// next block must lie in indirect2
next_block -= OSPFS_NINDIRECT;
if (0 < next_block && next_block <= (OSPFS_NINDIRECT * OSPFS_NINDIRECT)) {
uint32_t *ptrl1, *ptrl2;
uint32_t level1 = (next_block - 1) / OSPFS_NINDIRECT;
uint32_t level2 = (next_block - 1) % OSPFS_NINDIRECT;
if (!oi->oi_indirect2) {
if (!(allocated[0] = _add_block(&oi->oi_indirect2))) {
goto out;
}
}
ptrl1 = ospfs_block(oi->oi_indirect2);
if (!ptrl1[level1]) {
if (!(allocated[1] = _add_block(&ptrl1[level1]))) {
if (allocated[0]) {
free_block(allocated[0]);
oi->oi_indirect2 = 0;
}
goto out;
}
}
ptrl2 = ospfs_block(ptrl1[level1]);
if (!ptr[level2]) {
if (!_add_block(&ptr[level2])) {
if (allocated[0]) {
free_block(allocated[0]);
oi->oi_indirect2 = 0;
}
if (allocated[1]) {
free_block(allocated[1]);
((uint32_t *) ospfs_block(allocated[1]))
[level1] = 0;
}
goto out;
}
retval = 0;
goto out;
}
}
out:
return retval;
}