int tty_insert_flip_string_flags(struct tty_struct *tty,
const unsigned char *chars, const char *flags, size_t size)
{
struct tty_bufhead *buf = &tty->port->buf;
int copied = 0;
do {
int goal = min_t(size_t, size - copied, TTY_BUFFER_PAGE);
int space;
unsigned long __flags;
struct tty_buffer *tb;
spin_lock_irqsave(&buf->lock, __flags);
space = __tty_buffer_request_room(tty->port, goal);
tb = buf->tail;
/* If there is no space then tb may be NULL */
if (unlikely(space == 0)) {
spin_unlock_irqrestore(&buf->lock, __flags);
break;
}
memcpy(tb->char_buf_ptr + tb->used, chars, space);
memcpy(tb->flag_buf_ptr + tb->used, flags, space);
tb->used += space;
spin_unlock_irqrestore(&buf->lock, __flags);
copied += space;
chars += space;
flags += space;
/* There is a small chance that we need to split the data over
several buffers. If this is the case we must loop */
} while (unlikely(size > copied));
return copied;
}
/**
* tty_buffer_request_room - grow tty buffer if needed
* @tty: tty structure
* @size: size desired
*
* Make at least size bytes of linear space available for the tty
* buffer. If we fail return the size we managed to find.
*
* Locking: Takes tty->buf.lock
*/
int tty_buffer_request_room(struct tty_struct *tty, size_t size)
{
unsigned long flags;
int length;
spin_lock_irqsave(&tty->buf.lock, flags);
length = __tty_buffer_request_room(tty, size);
spin_unlock_irqrestore(&tty->buf.lock, flags);
return length;
}
int tty_prepare_flip_string_flags(struct tty_struct *tty,
unsigned char **chars, char **flags, size_t size)
{
int space;
unsigned long __flags;
struct tty_buffer *tb;
spin_lock_irqsave(&tty->buf.lock, __flags);
space = __tty_buffer_request_room(tty, size);
tb = tty->buf.tail;
if (likely(space)) {
*chars = tb->char_buf_ptr + tb->used;
*flags = tb->flag_buf_ptr + tb->used;
tb->used += space;
}
spin_unlock_irqrestore(&tty->buf.lock, __flags);
return space;
}
int tty_prepare_flip_string(struct tty_struct *tty, unsigned char **chars,
size_t size)
{
struct tty_bufhead *buf = &tty->port->buf;
int space;
unsigned long flags;
struct tty_buffer *tb;
spin_lock_irqsave(&buf->lock, flags);
space = __tty_buffer_request_room(tty->port, size);
tb = buf->tail;
if (likely(space)) {
*chars = tb->char_buf_ptr + tb->used;
memset(tb->flag_buf_ptr + tb->used, TTY_NORMAL, space);
tb->used += space;
}
spin_unlock_irqrestore(&buf->lock, flags);
return space;
}
