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 size_t __tty_insert_flip_string_flags(struct tty_port *port, const u8 *chars,
14 const u8 *flags, bool mutable_flags,
15 size_t size);
16 size_t tty_prepare_flip_string(struct tty_port *port, u8 **chars, size_t size);
17 void tty_flip_buffer_push(struct tty_port *port);
18
19 /**
20 * tty_insert_flip_string_fixed_flag - add characters to the tty buffer
21 * @port: tty port
22 * @chars: characters
23 * @flag: flag value for each character
24 * @size: size
25 *
26 * Queue a series of bytes to the tty buffering. All the characters passed are
27 * marked with the supplied flag.
28 *
29 * Returns: the number added.
30 */
tty_insert_flip_string_fixed_flag(struct tty_port * port,const u8 * chars,u8 flag,size_t size)31 static inline size_t tty_insert_flip_string_fixed_flag(struct tty_port *port,
32 const u8 *chars, u8 flag,
33 size_t size)
34 {
35 return __tty_insert_flip_string_flags(port, chars, &flag, false, size);
36 }
37
38 /**
39 * tty_insert_flip_string_flags - add characters to the tty buffer
40 * @port: tty port
41 * @chars: characters
42 * @flags: flag bytes
43 * @size: size
44 *
45 * Queue a series of bytes to the tty buffering. For each character the flags
46 * array indicates the status of the character.
47 *
48 * Returns: the number added.
49 */
tty_insert_flip_string_flags(struct tty_port * port,const u8 * chars,const u8 * flags,size_t size)50 static inline size_t tty_insert_flip_string_flags(struct tty_port *port,
51 const u8 *chars,
52 const u8 *flags, size_t size)
53 {
54 return __tty_insert_flip_string_flags(port, chars, flags, true, size);
55 }
56
57 /**
58 * tty_insert_flip_char - add one character to the tty buffer
59 * @port: tty port
60 * @ch: character
61 * @flag: flag byte
62 *
63 * Queue a single byte @ch to the tty buffering, with an optional flag.
64 */
tty_insert_flip_char(struct tty_port * port,u8 ch,u8 flag)65 static inline size_t tty_insert_flip_char(struct tty_port *port, u8 ch, u8 flag)
66 {
67 struct tty_buffer *tb = port->buf.tail;
68 int change;
69
70 change = !tb->flags && (flag != TTY_NORMAL);
71 if (!change && tb->used < tb->size) {
72 if (tb->flags)
73 *flag_buf_ptr(tb, tb->used) = flag;
74 *char_buf_ptr(tb, tb->used++) = ch;
75 return 1;
76 }
77 return __tty_insert_flip_string_flags(port, &ch, &flag, false, 1);
78 }
79
tty_insert_flip_string(struct tty_port * port,const u8 * chars,size_t size)80 static inline size_t tty_insert_flip_string(struct tty_port *port,
81 const u8 *chars, size_t size)
82 {
83 return tty_insert_flip_string_fixed_flag(port, chars, TTY_NORMAL, size);
84 }
85
86 size_t tty_ldisc_receive_buf(struct tty_ldisc *ld, const u8 *p, const u8 *f,
87 size_t count);
88
89 void tty_buffer_lock_exclusive(struct tty_port *port);
90 void tty_buffer_unlock_exclusive(struct tty_port *port);
91
92 #endif /* _LINUX_TTY_FLIP_H */
93