include/linux/tty_flip.h

   1 /* SPDX-License-Identifier: GPL-2.0 */
   2 #ifndef _LINUX_TTY_FLIP_H
   3 #define _LINUX_TTY_FLIP_H
   4
   5 extern int tty_buffer_set_limit(struct tty_port *port, int limit);
   6 extern int tty_buffer_space_avail(struct tty_port *port);
   7 extern int tty_buffer_request_room(struct tty_port *port, size_t size);
   8 extern int tty_insert_flip_string_flags(struct tty_port *port,
   9                 const unsigned char *chars, const char *flags, size_t size);
  10 extern int tty_insert_flip_string_fixed_flag(struct tty_port *port,
  11                 const unsigned char *chars, char flag, size_t size);
  12 extern int tty_prepare_flip_string(struct tty_port *port,
  13                 unsigned char **chars, size_t size);
  14 extern void tty_flip_buffer_push(struct tty_port *port);
  15 void tty_schedule_flip(struct tty_port *port);
  16 int __tty_insert_flip_char(struct tty_port *port, unsigned char ch, char flag);
  17
  18 static 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
  34 static 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
  40 extern void tty_buffer_lock_exclusive(struct tty_port *port);
  41 extern void tty_buffer_unlock_exclusive(struct tty_port *port);
  42
  43 #endif /* _LINUX_TTY_FLIP_H */