int snd_seq_expand_var_event(const snd_seq_event_t *event, int count, char *buf, int in_kernel, int size_aligned)
{
int len, newlen;
int err;
if ((len = get_var_len(event)) < 0)
return len;
newlen = len;
if (size_aligned > 0)
newlen = ((len + size_aligned - 1) / size_aligned) * size_aligned;
if (count < newlen)
return -EAGAIN;
if (event->data.ext.len & SNDRV_SEQ_EXT_USRPTR) {
if (! in_kernel)
return -EINVAL;
if (copy_from_user(buf, event->data.ext.ptr, len))
return -EFAULT;
return newlen;
}
err = snd_seq_dump_var_event(event,
in_kernel ? (snd_seq_dump_func_t)seq_copy_in_kernel :
(snd_seq_dump_func_t)seq_copy_in_user,
&buf);
return err < 0 ? err : newlen;
}
int snd_seq_dump_var_event(const struct snd_seq_event *event,
snd_seq_dump_func_t func, void *private_data)
{
int len, err;
struct snd_seq_event_cell *cell;
if ((len = get_var_len(event)) <= 0)
return len;
if (event->data.ext.len & SNDRV_SEQ_EXT_USRPTR) {
char buf[32];
char __user *curptr = (char __force __user *)event->data.ext.ptr;
while (len > 0) {
int size = sizeof(buf);
if (len < size)
size = len;
if (copy_from_user(buf, curptr, size))
return -EFAULT;
err = func(private_data, buf, size);
if (err < 0)
return err;
curptr += size;
len -= size;
}
return 0;
} if (! (event->data.ext.len & SNDRV_SEQ_EXT_CHAINED)) {
return func(private_data, event->data.ext.ptr, len);
}
cell = (struct snd_seq_event_cell *)event->data.ext.ptr;
for (; len > 0 && cell; cell = cell->next) {
int size = sizeof(struct snd_seq_event);
if (len < size)
size = len;
err = func(private_data, &cell->event, size);
if (err < 0)
return err;
len -= size;
}
return 0;
}