LXR linux/include/linux/tty

   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
   8struct tty_ldisc;
   9
  10extern int tty_buffer_set_limit(struct tty_port *port, int limit);
  11extern unsigned int tty_buffer_space_avail(struct tty_port *port);
  12extern int tty_buffer_request_room(struct tty_port *port, size_t size);
  13extern int tty_insert_flip_string_flags(struct tty_port *port,
  14                const unsigned char *chars, const char *flags, size_t size);
  15extern int tty_insert_flip_string_fixed_flag(struct tty_port *port,
  16                const unsigned char *chars, char flag, size_t size);
  17extern int tty_prepare_flip_string(struct tty_port *port,
  18                unsigned char **chars, size_t size);
  19extern void tty_flip_buffer_push(struct tty_port *port);
  20void tty_schedule_flip(struct tty_port *port);
  21int __tty_insert_flip_char(struct tty_port *port, unsigned char ch, char flag);
  22
  23static inline int tty_insert_flip_char(struct tty_port *port,
  24                                        unsigned char ch, char flag)
  25{
  26        struct tty_buffer *tb = port->buf.tail;
  27        int change;
  28
  29        change = (tb->flags & TTYB_NORMAL) && (flag != TTY_NORMAL);
  30        if (!change && tb->used < tb->size) {
  31                if (~tb->flags & TTYB_NORMAL)
  32                        *flag_buf_ptr(tb, tb->used) = flag;
  33                *char_buf_ptr(tb, tb->used++) = ch;
  34                return 1;
  35        }
  36        return __tty_insert_flip_char(port, ch, flag);
  37}
  38
  39static inline int tty_insert_flip_string(struct tty_port *port,
  40                const unsigned char *chars, size_t size)
  41{
  42        return tty_insert_flip_string_fixed_flag(port, chars, TTY_NORMAL, size);
  43}
  44
  45int tty_ldisc_receive_buf(struct tty_ldisc *ld, const unsigned char *p,
  46                const char *f, int count);
  47
  48extern void tty_buffer_lock_exclusive(struct tty_port *port);
  49extern void tty_buffer_unlock_exclusive(struct tty_port *port);
  50
  51#endif /* _LINUX_TTY_FLIP_H */
  52