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 size_t __tty_insert_flip_string_flags(struct tty_port *port, const u8 *chars, 14 const u8 *flags, bool mutable_flags, 15 size_t size); 16 size_t tty_prepare_flip_string(struct tty_port *port, u8 **chars, size_t size); 17 void tty_flip_buffer_push(struct tty_port *port); 18 int __tty_insert_flip_char(struct tty_port *port, u8 ch, u8 flag); 19 20 /** 21 * tty_insert_flip_string_fixed_flag - add characters to the tty buffer 22 * @port: tty port 23 * @chars: characters 24 * @flag: flag value for each character 25 * @size: size 26 * 27 * Queue a series of bytes to the tty buffering. All the characters passed are 28 * marked with the supplied flag. 29 * 30 * Returns: the number added. 31 */ 32 static inline size_t tty_insert_flip_string_fixed_flag(struct tty_port *port, 33 const u8 *chars, u8 flag, 34 size_t size) 35 { 36 return __tty_insert_flip_string_flags(port, chars, &flag, false, size); 37 } 38 39 /** 40 * tty_insert_flip_string_flags - add characters to the tty buffer 41 * @port: tty port 42 * @chars: characters 43 * @flags: flag bytes 44 * @size: size 45 * 46 * Queue a series of bytes to the tty buffering. For each character the flags 47 * array indicates the status of the character. 48 * 49 * Returns: the number added. 50 */ 51 static inline size_t tty_insert_flip_string_flags(struct tty_port *port, 52 const u8 *chars, 53 const u8 *flags, size_t size) 54 { 55 return __tty_insert_flip_string_flags(port, chars, flags, true, size); 56 } 57 58 59 static inline size_t tty_insert_flip_char(struct tty_port *port, u8 ch, u8 flag) 60 { 61 struct tty_buffer *tb = port->buf.tail; 62 int change; 63 64 change = !tb->flags && (flag != TTY_NORMAL); 65 if (!change && tb->used < tb->size) { 66 if (tb->flags) 67 *flag_buf_ptr(tb, tb->used) = flag; 68 *char_buf_ptr(tb, tb->used++) = ch; 69 return 1; 70 } 71 return __tty_insert_flip_char(port, ch, flag); 72 } 73 74 static inline size_t tty_insert_flip_string(struct tty_port *port, 75 const u8 *chars, size_t size) 76 { 77 return tty_insert_flip_string_fixed_flag(port, chars, TTY_NORMAL, size); 78 } 79 80 size_t tty_ldisc_receive_buf(struct tty_ldisc *ld, const u8 *p, const u8 *f, 81 size_t count); 82 83 void tty_buffer_lock_exclusive(struct tty_port *port); 84 void tty_buffer_unlock_exclusive(struct tty_port *port); 85 86 #endif /* _LINUX_TTY_FLIP_H */ 87