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
   5extern int tty_buffer_set_limit(struct tty_port *port, int limit);
   6extern int tty_buffer_space_avail(struct tty_port *port);
   7extern int tty_buffer_request_room(struct tty_port *port, size_t size);
   8extern int tty_insert_flip_string_flags(struct tty_port *port,
   9                const unsigned char *chars, const char *flags, size_t size);
  10extern int tty_insert_flip_string_fixed_flag(struct tty_port *port,
  11                const unsigned char *chars, char flag, size_t size);
  12extern int tty_prepare_flip_string(struct tty_port *port,
  13                unsigned char **chars, size_t size);
  14extern void tty_flip_buffer_push(struct tty_port *port);
  15void tty_schedule_flip(struct tty_port *port);
  16int __tty_insert_flip_char(struct tty_port *port, unsigned char ch, char flag);
  17
  18static inline int tty_insert_flip_char(struct tty_port *port,
  19                                        unsigned char ch, char flag)
  20{
  21        struct tty_buffer *tb = port->buf.tail;
  22        int change;
  23
  24        change = (tb->flags & TTYB_NORMAL) && (flag != TTY_NORMAL);
  25        if (!change && tb->used < tb->size) {
  26                if (~tb->flags & TTYB_NORMAL)
  27                        *flag_buf_ptr(tb, tb->used) = flag;
  28                *char_buf_ptr(tb, tb->used++) = ch;
  29                return 1;
  30        }
  31        return __tty_insert_flip_char(port, ch, flag);
  32}
  33
  34static inline int tty_insert_flip_string(struct tty_port *port,
  35                const unsigned char *chars, size_t size)
  36{
  37        return tty_insert_flip_string_fixed_flag(port, chars, TTY_NORMAL, size);
  38}
  39
  40extern void tty_buffer_lock_exclusive(struct tty_port *port);
  41extern void tty_buffer_unlock_exclusive(struct tty_port *port);
  42
  43#endif /* _LINUX_TTY_FLIP_H */
  44