1 /* SPDX-License-Identifier: GPL-2.0 */
2 #ifndef _LINUX_TTY_FLIP_H
3 #define _LINUX_TTY_FLIP_H
4
5 #include <linux/tty_buffer.h>
6 #include <linux/tty_port.h>
7
8 struct tty_ldisc;
9
10 int tty_buffer_set_limit(struct tty_port *port, int limit);
11 unsigned int tty_buffer_space_avail(struct tty_port *port);
12 int tty_buffer_request_room(struct tty_port *port, size_t size);
13 int tty_insert_flip_string_flags(struct tty_port *port,
14 const unsigned char *chars, const char *flags, size_t size);
15 int tty_insert_flip_string_fixed_flag(struct tty_port *port,
16 const unsigned char *chars, char flag, size_t size);
17 int tty_prepare_flip_string(struct tty_port *port, unsigned char **chars,
18 size_t size);
19 void tty_flip_buffer_push(struct tty_port *port);
20 int __tty_insert_flip_char(struct tty_port *port, unsigned char ch, char flag);
21
tty_insert_flip_char(struct tty_port * port,unsigned char ch,char flag)22 static inline int tty_insert_flip_char(struct tty_port *port,
23 unsigned char ch, char flag)
24 {
25 struct tty_buffer *tb = port->buf.tail;
26 int change;
27
28 change = (tb->flags & TTYB_NORMAL) && (flag != TTY_NORMAL);
29 if (!change && tb->used < tb->size) {
30 if (~tb->flags & TTYB_NORMAL)
31 *flag_buf_ptr(tb, tb->used) = flag;
32 *char_buf_ptr(tb, tb->used++) = ch;
33 return 1;
34 }
35 return __tty_insert_flip_char(port, ch, flag);
36 }
37
tty_insert_flip_string(struct tty_port * port,const unsigned char * chars,size_t size)38 static inline int tty_insert_flip_string(struct tty_port *port,
39 const unsigned char *chars, size_t size)
40 {
41 return tty_insert_flip_string_fixed_flag(port, chars, TTY_NORMAL, size);
42 }
43
44 int tty_ldisc_receive_buf(struct tty_ldisc *ld, const unsigned char *p,
45 const char *f, int count);
46
47 void tty_buffer_lock_exclusive(struct tty_port *port);
48 void tty_buffer_unlock_exclusive(struct tty_port *port);
49
50 #endif /* _LINUX_TTY_FLIP_H */
51
