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 */ 44