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2e2b4b8961
The struct tty_buffer has flags which is only used for storing TTYB_NORMAL. There is also a few quite confusing operations for checking the presense of TTYB_NORMAL. Simplify things by converting flags to bool. Despite the name remaining the same, the meaning of "flags" is altered slightly by this change. Previously it referred to flags of the buffer (only TTYB_NORMAL being used as a flag). After this change, flags tell whether the buffer contains/should be allocated with flags array along with character data array. It is much more suitable name that TTYB_NORMAL was for this purpose, thus the name remains. Signed-off-by: Ilpo Järvinen <ilpo.jarvinen@linux.intel.com> Link: https://lore.kernel.org/r/20221019105504.16800-1-ilpo.jarvinen@linux.intel.com Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
50 lines
1.6 KiB
C
50 lines
1.6 KiB
C
/* SPDX-License-Identifier: GPL-2.0 */
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#ifndef _LINUX_TTY_FLIP_H
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#define _LINUX_TTY_FLIP_H
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#include <linux/tty_buffer.h>
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#include <linux/tty_port.h>
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struct tty_ldisc;
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int tty_buffer_set_limit(struct tty_port *port, int limit);
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unsigned int tty_buffer_space_avail(struct tty_port *port);
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int tty_buffer_request_room(struct tty_port *port, size_t size);
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int tty_insert_flip_string_flags(struct tty_port *port,
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const unsigned char *chars, const char *flags, size_t size);
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int tty_insert_flip_string_fixed_flag(struct tty_port *port,
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const unsigned char *chars, char flag, size_t size);
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int tty_prepare_flip_string(struct tty_port *port, unsigned char **chars,
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size_t size);
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void tty_flip_buffer_push(struct tty_port *port);
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int __tty_insert_flip_char(struct tty_port *port, unsigned char ch, char flag);
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static inline int tty_insert_flip_char(struct tty_port *port,
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unsigned char ch, char flag)
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{
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struct tty_buffer *tb = port->buf.tail;
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int change;
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change = !tb->flags && (flag != TTY_NORMAL);
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if (!change && tb->used < tb->size) {
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if (tb->flags)
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*flag_buf_ptr(tb, tb->used) = flag;
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*char_buf_ptr(tb, tb->used++) = ch;
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return 1;
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}
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return __tty_insert_flip_char(port, ch, flag);
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}
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static inline int tty_insert_flip_string(struct tty_port *port,
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const unsigned char *chars, size_t size)
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{
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return tty_insert_flip_string_fixed_flag(port, chars, TTY_NORMAL, size);
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}
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int tty_ldisc_receive_buf(struct tty_ldisc *ld, const unsigned char *p,
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const char *f, int count);
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void tty_buffer_lock_exclusive(struct tty_port *port);
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void tty_buffer_unlock_exclusive(struct tty_port *port);
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#endif /* _LINUX_TTY_FLIP_H */
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