1 /* SPDX-License-Identifier: GPL-2.0 */
2 #ifndef _LINUX_TTY_FLIP_H
3 #define _LINUX_TTY_FLIP_H
5 #include <linux/tty_buffer.h>
6 #include <linux/tty_port.h>
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,
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);
20 * tty_insert_flip_string_fixed_flag - add characters to the tty buffer
23 * @flag: flag value for each character
26 * Queue a series of bytes to the tty buffering. All the characters passed are
27 * marked with the supplied flag.
29 * Returns: the number added.
31 static inline size_t tty_insert_flip_string_fixed_flag(struct tty_port *port,
32 const u8 *chars, u8 flag,
35 return __tty_insert_flip_string_flags(port, chars, &flag, false, size);
39 * tty_insert_flip_string_flags - add characters to the tty buffer
45 * Queue a series of bytes to the tty buffering. For each character the flags
46 * array indicates the status of the character.
48 * Returns: the number added.
50 static inline size_t tty_insert_flip_string_flags(struct tty_port *port,
52 const u8 *flags, size_t size)
54 return __tty_insert_flip_string_flags(port, chars, flags, true, size);
58 * tty_insert_flip_char - add one character to the tty buffer
63 * Queue a single byte @ch to the tty buffering, with an optional flag.
65 static inline size_t tty_insert_flip_char(struct tty_port *port, u8 ch, u8 flag)
67 struct tty_buffer *tb = port->buf.tail;
70 change = !tb->flags && (flag != TTY_NORMAL);
71 if (!change && tb->used < tb->size) {
73 *flag_buf_ptr(tb, tb->used) = flag;
74 *char_buf_ptr(tb, tb->used++) = ch;
77 return __tty_insert_flip_string_flags(port, &ch, &flag, false, 1);
80 static inline size_t tty_insert_flip_string(struct tty_port *port,
81 const u8 *chars, size_t size)
83 return tty_insert_flip_string_fixed_flag(port, chars, TTY_NORMAL, size);
86 size_t tty_ldisc_receive_buf(struct tty_ldisc *ld, const u8 *p, const u8 *f,
89 void tty_buffer_lock_exclusive(struct tty_port *port);
90 void tty_buffer_unlock_exclusive(struct tty_port *port);
92 #endif /* _LINUX_TTY_FLIP_H */