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, 14 const unsigned char *chars, const char *flags, size_t size); 15 int tty_insert_flip_string_fixed_flag(struct tty_port *port, 16 const unsigned char *chars, char flag, size_t size); 17 int tty_prepare_flip_string(struct tty_port *port, unsigned char **chars, 18 size_t size); 19 void tty_flip_buffer_push(struct tty_port *port); 20 int __tty_insert_flip_char(struct tty_port *port, unsigned char ch, char flag); 21 22 static inline int tty_insert_flip_char(struct tty_port *port, 23 unsigned char ch, char flag) 24 { 25 struct tty_buffer *tb = port->buf.tail; 26 int change; 27 28 change = !tb->flags && (flag != TTY_NORMAL); 29 if (!change && tb->used < tb->size) { 30 if (tb->flags) 31 *flag_buf_ptr(tb, tb->used) = flag; 32 *char_buf_ptr(tb, tb->used++) = ch; 33 return 1; 34 } 35 return __tty_insert_flip_char(port, ch, flag); 36 } 37 38 static inline int tty_insert_flip_string(struct tty_port *port, 39 const unsigned char *chars, size_t size) 40 { 41 return tty_insert_flip_string_fixed_flag(port, chars, TTY_NORMAL, size); 42 } 43 44 int tty_ldisc_receive_buf(struct tty_ldisc *ld, const unsigned char *p, 45 const char *f, int count); 46 47 void tty_buffer_lock_exclusive(struct tty_port *port); 48 void tty_buffer_unlock_exclusive(struct tty_port *port); 49 50 #endif /* _LINUX_TTY_FLIP_H */ 51