include/linux/tty_flip.h

0001 /* SPDX-License-Identifier: GPL-2.0 */
0002 #ifndef _LINUX_TTY_FLIP_H
0003 #define _LINUX_TTY_FLIP_H
0004
0005 #include <linux/tty_buffer.h>
0006 #include <linux/tty_port.h>
0007
0008 struct tty_ldisc;
0009
0010 int tty_buffer_set_limit(struct tty_port *port, int limit);
0011 unsigned int tty_buffer_space_avail(struct tty_port *port);
0012 int tty_buffer_request_room(struct tty_port *port, size_t size);
0013 int tty_insert_flip_string_flags(struct tty_port *port,
0014         const unsigned char *chars, const char *flags, size_t size);
0015 int tty_insert_flip_string_fixed_flag(struct tty_port *port,
0016         const unsigned char *chars, char flag, size_t size);
0017 int tty_prepare_flip_string(struct tty_port *port, unsigned char **chars,
0018         size_t size);
0019 void tty_flip_buffer_push(struct tty_port *port);
0020 int __tty_insert_flip_char(struct tty_port *port, unsigned char ch, char flag);
0021
0022 static inline int tty_insert_flip_char(struct tty_port *port,
0023                     unsigned char ch, char flag)
0024 {
0025     struct tty_buffer *tb = port->buf.tail;
0026     int change;
0027
0028     change = (tb->flags & TTYB_NORMAL) && (flag != TTY_NORMAL);
0029     if (!change && tb->used < tb->size) {
0030         if (~tb->flags & TTYB_NORMAL)
0031             *flag_buf_ptr(tb, tb->used) = flag;
0032         *char_buf_ptr(tb, tb->used++) = ch;
0033         return 1;
0034     }
0035     return __tty_insert_flip_char(port, ch, flag);
0036 }
0037
0038 static inline int tty_insert_flip_string(struct tty_port *port,
0039         const unsigned char *chars, size_t size)
0040 {
0041     return tty_insert_flip_string_fixed_flag(port, chars, TTY_NORMAL, size);
0042 }
0043
0044 int tty_ldisc_receive_buf(struct tty_ldisc *ld, const unsigned char *p,
0045         const char *f, int count);
0046
0047 void tty_buffer_lock_exclusive(struct tty_port *port);
0048 void tty_buffer_unlock_exclusive(struct tty_port *port);
0049
0050 #endif /* _LINUX_TTY_FLIP_H */