/* SPDX-License-Identifier: GPL-2.0 */

  #ifndef _LINUX_TTY_FLIP_H
  #define _LINUX_TTY_FLIP_H

  extern int tty_buffer_set_limit(struct tty_port *port, int limit);

  extern int tty_buffer_space_avail(struct tty_port *port);

  extern int tty_buffer_request_room(struct tty_port *port, size_t size);

  extern int tty_insert_flip_string_flags(struct tty_port *port,
  		const unsigned char *chars, const char *flags, size_t size);
  extern int tty_insert_flip_string_fixed_flag(struct tty_port *port,
  		const unsigned char *chars, char flag, size_t size);
  extern int tty_prepare_flip_string(struct tty_port *port,
  		unsigned char **chars, size_t size);

  extern void tty_flip_buffer_push(struct tty_port *port);

  void tty_schedule_flip(struct tty_port *port);

  int __tty_insert_flip_char(struct tty_port *port, unsigned char ch, char flag);

  static inline int tty_insert_flip_char(struct tty_port *port,

  					unsigned char ch, char flag)

  {

  	struct tty_buffer *tb = port->buf.tail;

  	int change;
  
  	change = (tb->flags & TTYB_NORMAL) && (flag != TTY_NORMAL);
  	if (!change && tb->used < tb->size) {
  		if (~tb->flags & TTYB_NORMAL)
  			*flag_buf_ptr(tb, tb->used) = flag;

  		*char_buf_ptr(tb, tb->used++) = ch;

  		return 1;

  	}

  	return __tty_insert_flip_char(port, ch, flag);

  }

  static inline int tty_insert_flip_string(struct tty_port *port,
  		const unsigned char *chars, size_t size)

  {

  	return tty_insert_flip_string_fixed_flag(port, chars, TTY_NORMAL, size);

  }

  extern void tty_buffer_lock_exclusive(struct tty_port *port);
  extern void tty_buffer_unlock_exclusive(struct tty_port *port);

  #endif /* _LINUX_TTY_FLIP_H */