int uffs_truncate(int fd, long remain)
{
int ret;
uffs_Object *obj = FD2OBJ(fd);
CHK_OBJ(obj, -1);
uffs_ClearObjectErr(obj);
ret = (uffs_TruncateObject(obj, remain) == U_SUCC) ? 0 : -1;
uffs_set_error(-uffs_GetObjectErr(obj));
return ret;
}
int uffs_ftruncate(int fd, long remain)
{
int ret;
uffs_Object *obj;
CHK_OBJ_LOCK(fd, obj, -1);
uffs_ClearObjectErr(obj);
ret = (uffs_TruncateObject(obj, remain) == U_SUCC) ? 0 : -1;
uffs_set_error(-uffs_GetObjectErr(obj));
uffs_GlobalFsLockUnlock();
return ret;
}
/**
* \brief delete uffs object
*
* \param[in] name full name of object
* \param[out] err return error code
*
* \return U_SUCC if object is deleted successfully.
* return U_FAIL if error happen, error code is set to *err.
*/
URET uffs_DeleteObject(const char * name, int *err)
{
uffs_Object *obj;
TreeNode *node;
uffs_Device *dev;
u16 block;
uffs_Buf *buf;
URET ret = U_FAIL;
obj = uffs_GetObject();
if (obj == NULL) {
if (err)
*err = UEMFILE;
goto err1;
}
if (uffs_OpenObject(obj, name, UO_RDWR|UO_DIR) == U_FAIL) {
if (uffs_OpenObject(obj, name, UO_RDWR) == U_FAIL) {
if (err)
*err = UENOENT;
goto err1;
}
}
uffs_TruncateObject(obj, 0);
uffs_ObjectDevLock(obj);
dev = obj->dev;
if (obj->type == UFFS_TYPE_DIR)
{
// if the dir is not empty, can't delete it.
node = uffs_TreeFindDirNodeWithParent(dev, obj->serial);
if (node != NULL)
{
if (err)
*err = UEACCES;
goto err; //have sub dirs ?
}
node = uffs_TreeFindFileNodeWithParent(dev, obj->serial);
if (node != NULL)
{
if (err)
*err = UEACCES;
goto err; //have sub files ?
}
}
block = GET_BLOCK_FROM_NODE(obj);
node = obj->node;
// before erase the block, we need to take care of the buffer ...
uffs_BufFlushAll(dev);
if (HAVE_BADBLOCK(dev))
uffs_BadBlockRecover(dev);
buf = uffs_BufFind(dev, obj->parent, obj->serial, 0);
if (buf) {
//need to expire this buffer ...
if (buf->ref_count != 0) {
//there is other obj for this file still in use ?
uffs_Perror(UFFS_ERR_NORMAL, "Try to delete object but still have buf referenced.");
if (err)
*err = UEACCES;
goto err;
}
buf->mark = UFFS_BUF_EMPTY; //!< make this buffer expired.
}
//TODO: need to take care of other obj->node ?
uffs_BreakFromEntry(dev, obj->type, node);
uffs_FlashEraseBlock(dev, block);
node->u.list.block = block;
if (HAVE_BADBLOCK(dev))
uffs_BadBlockProcess(dev, node);
else
uffs_TreeInsertToErasedListTail(dev, node);
ret = U_SUCC;
err:
uffs_ObjectDevUnLock(obj);
err1:
do_ReleaseObjectResource(obj);
uffs_PutObject(obj);
return ret;
}
