1 /* SPDX-License-Identifier: GPL-2.0 */ 2 #ifndef _LINUX_TTY_FLIP_H 3 #define _LINUX_TTY_FLIP_H 4 5 #include <linux/tty_buffer.h> 6 #include <linux/tty_port.h> 7 8 struct tty_ldisc; 9 10 int tty_buffer_set_limit(struct tty_port *port, int limit); 11 unsigned int tty_buffer_space_avail(struct tty_port *port); 12 int tty_buffer_request_room(struct tty_port *port, size_t size); 13 int tty_insert_flip_string_flags(struct tty_port *port, const u8 *chars, 14 const u8 *flags, size_t size); 15 int tty_insert_flip_string_fixed_flag(struct tty_port *port, const u8 *chars, 16 u8 flag, size_t size); 17 int tty_prepare_flip_string(struct tty_port *port, u8 **chars, size_t size); 18 void tty_flip_buffer_push(struct tty_port *port); 19 int __tty_insert_flip_char(struct tty_port *port, u8 ch, u8 flag); 20 21 static inline int tty_insert_flip_char(struct tty_port *port, u8 ch, u8 flag) 22 { 23 struct tty_buffer *tb = port->buf.tail; 24 int change; 25 26 change = !tb->flags && (flag != TTY_NORMAL); 27 if (!change && tb->used < tb->size) { 28 if (tb->flags) 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 u8 *chars, size_t size) 38 { 39 return tty_insert_flip_string_fixed_flag(port, chars, TTY_NORMAL, size); 40 } 41 42 size_t tty_ldisc_receive_buf(struct tty_ldisc *ld, const u8 *p, const u8 *f, 43 size_t count); 44 45 void tty_buffer_lock_exclusive(struct tty_port *port); 46 void tty_buffer_unlock_exclusive(struct tty_port *port); 47 48 #endif /* _LINUX_TTY_FLIP_H */ 49