| 1 | /* SPDX-License-Identifier: GPL-2.0 */ |
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| 2 | #ifndef _LINUX_TTY_FLIP_H |
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| 3 | #define _LINUX_TTY_FLIP_H |
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| 4 | |
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| 5 | #include <linux/tty_buffer.h> |
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| 6 | #include <linux/tty_port.h> |
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| 7 | |
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| 8 | struct tty_ldisc; |
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| 9 | |
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| 10 | int tty_buffer_set_limit(struct tty_port *port, int limit); |
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| 11 | unsigned int tty_buffer_space_avail(struct tty_port *port); |
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| 12 | int tty_buffer_request_room(struct tty_port *port, size_t size); |
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| 13 | size_t __tty_insert_flip_string_flags(struct tty_port *port, const u8 *chars, |
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| 14 | const u8 *flags, bool mutable_flags, |
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| 15 | size_t size); |
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| 16 | size_t tty_prepare_flip_string(struct tty_port *port, u8 **chars, size_t size); |
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| 17 | void tty_flip_buffer_push(struct tty_port *port); |
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| 18 | |
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| 19 | /** |
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| 20 | * tty_insert_flip_string_fixed_flag - add characters to the tty buffer |
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| 21 | * @port: tty port |
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| 22 | * @chars: characters |
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| 23 | * @flag: flag value for each character |
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| 24 | * @size: size |
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| 25 | * |
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| 26 | * Queue a series of bytes to the tty buffering. All the characters passed are |
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| 27 | * marked with the supplied flag. |
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| 28 | * |
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| 29 | * Returns: the number added. |
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| 30 | */ |
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| 31 | static inline size_t tty_insert_flip_string_fixed_flag(struct tty_port *port, |
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| 32 | const u8 *chars, u8 flag, |
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| 33 | size_t size) |
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| 34 | { |
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| 35 | return __tty_insert_flip_string_flags(port, chars, flags: &flag, mutable_flags: false, size); |
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| 36 | } |
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| 37 | |
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| 38 | /** |
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| 39 | * tty_insert_flip_string_flags - add characters to the tty buffer |
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| 40 | * @port: tty port |
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| 41 | * @chars: characters |
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| 42 | * @flags: flag bytes |
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| 43 | * @size: size |
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| 44 | * |
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| 45 | * Queue a series of bytes to the tty buffering. For each character the flags |
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| 46 | * array indicates the status of the character. |
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| 47 | * |
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| 48 | * Returns: the number added. |
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| 49 | */ |
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| 50 | static inline size_t tty_insert_flip_string_flags(struct tty_port *port, |
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| 51 | const u8 *chars, |
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| 52 | const u8 *flags, size_t size) |
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| 53 | { |
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| 54 | return __tty_insert_flip_string_flags(port, chars, flags, mutable_flags: true, size); |
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| 55 | } |
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| 56 | |
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| 57 | /** |
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| 58 | * tty_insert_flip_char - add one character to the tty buffer |
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| 59 | * @port: tty port |
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| 60 | * @ch: character |
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| 61 | * @flag: flag byte |
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| 62 | * |
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| 63 | * Queue a single byte @ch to the tty buffering, with an optional flag. |
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| 64 | */ |
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| 65 | static inline size_t tty_insert_flip_char(struct tty_port *port, u8 ch, u8 flag) |
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| 66 | { |
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| 67 | struct tty_buffer *tb = port->buf.tail; |
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| 68 | int change; |
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| 69 | |
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| 70 | change = !tb->flags && (flag != TTY_NORMAL); |
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| 71 | if (!change && tb->used < tb->size) { |
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| 72 | if (tb->flags) |
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| 73 | *flag_buf_ptr(b: tb, ofs: tb->used) = flag; |
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| 74 | *char_buf_ptr(b: tb, ofs: tb->used++) = ch; |
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| 75 | return 1; |
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| 76 | } |
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| 77 | return __tty_insert_flip_string_flags(port, chars: &ch, flags: &flag, mutable_flags: false, size: 1); |
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| 78 | } |
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| 79 | |
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| 80 | static inline size_t tty_insert_flip_string(struct tty_port *port, |
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| 81 | const u8 *chars, size_t size) |
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| 82 | { |
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| 83 | return tty_insert_flip_string_fixed_flag(port, chars, TTY_NORMAL, size); |
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| 84 | } |
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| 85 | |
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| 86 | size_t tty_ldisc_receive_buf(struct tty_ldisc *ld, const u8 *p, const u8 *f, |
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| 87 | size_t count); |
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| 88 | |
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| 89 | void tty_buffer_lock_exclusive(struct tty_port *port); |
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| 90 | void tty_buffer_unlock_exclusive(struct tty_port *port); |
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| 91 | |
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| 92 | #endif /* _LINUX_TTY_FLIP_H */ |
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| 93 | |
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