1 /* SPDX-License-Identifier: GPL-2.0 */ 2 #ifndef _LINUX_TTY_FLIP_H 3 #define _LINUX_TTY_FLIP_H 4 5 #include <linux/tty.h> 6 7 extern int tty_buffer_set_limit(struct tty_port *port, int limit); 8 extern unsigned int tty_buffer_space_avail(struct tty_port *port); 9 extern int tty_buffer_request_room(struct tty_port *port, size_t size); 10 extern int tty_insert_flip_string_flags(struct tty_port *port, 11 const unsigned char *chars, const char *flags, size_t size); 12 extern int tty_insert_flip_string_fixed_flag(struct tty_port *port, 13 const unsigned char *chars, char flag, size_t size); 14 extern int tty_prepare_flip_string(struct tty_port *port, 15 unsigned char **chars, size_t size); 16 extern void tty_flip_buffer_push(struct tty_port *port); 17 void tty_schedule_flip(struct tty_port *port); 18 int __tty_insert_flip_char(struct tty_port *port, unsigned char ch, char flag); 19 20 static inline int tty_insert_flip_char(struct tty_port *port, 21 unsigned char ch, char flag) 22 { 23 struct tty_buffer *tb = port->buf.tail; 24 int change; 25 26 change = (tb->flags & TTYB_NORMAL) && (flag != TTY_NORMAL); 27 if (!change && tb->used < tb->size) { 28 if (~tb->flags & TTYB_NORMAL) 29 *flag_buf_ptr(tb, tb->used) = flag; 30 *char_buf_ptr(tb, tb->used++) = ch; 31 return 1; 32 } 33 return __tty_insert_flip_char(port, ch, flag); 34 } 35 36 static inline int tty_insert_flip_string(struct tty_port *port, 37 const unsigned char *chars, size_t size) 38 { 39 return tty_insert_flip_string_fixed_flag(port, chars, TTY_NORMAL, size); 40 } 41 42 extern void tty_buffer_lock_exclusive(struct tty_port *port); 43 extern void tty_buffer_unlock_exclusive(struct tty_port *port); 44 45 #endif /* _LINUX_TTY_FLIP_H */ 46