1// SPDX-License-Identifier: GPL-2.0
2#include <linux/termios_internal.h>
3
4int user_termio_to_kernel_termios(struct ktermios *termios,
5						struct termio __user *termio)
6{
7	struct termio v;
8	bool canon;
9
10	if (copy_from_user(&v, termio, sizeof(struct termio)))
11		return -EFAULT;
12
13	termios->c_iflag = (0xffff0000 & termios->c_iflag) | v.c_iflag;
14	termios->c_oflag = (0xffff0000 & termios->c_oflag) | v.c_oflag;
15	termios->c_cflag = (0xffff0000 & termios->c_cflag) | v.c_cflag;
16	termios->c_lflag = (0xffff0000 & termios->c_lflag) | v.c_lflag;
17	termios->c_line = (0xffff0000 & termios->c_lflag) | v.c_line;
18
19	canon = v.c_lflag & ICANON;
20	termios->c_cc[VINTR]  = v.c_cc[_VINTR];
21	termios->c_cc[VQUIT]  = v.c_cc[_VQUIT];
22	termios->c_cc[VERASE] = v.c_cc[_VERASE];
23	termios->c_cc[VKILL]  = v.c_cc[_VKILL];
24	termios->c_cc[VEOL2]  = v.c_cc[_VEOL2];
25	termios->c_cc[VSWTC]  = v.c_cc[_VSWTC];
26	termios->c_cc[canon ? VEOF : VMIN]  = v.c_cc[_VEOF];
27	termios->c_cc[canon ? VEOL : VTIME] = v.c_cc[_VEOL];
28
29	return 0;
30}
31
32int kernel_termios_to_user_termio(struct termio __user *termio,
33						struct ktermios *termios)
34{
35	struct termio v;
36	bool canon;
37
38	memset(&v, 0, sizeof(struct termio));
39	v.c_iflag = termios->c_iflag;
40	v.c_oflag = termios->c_oflag;
41	v.c_cflag = termios->c_cflag;
42	v.c_lflag = termios->c_lflag;
43	v.c_line = termios->c_line;
44
45	canon = v.c_lflag & ICANON;
46	v.c_cc[_VINTR]  = termios->c_cc[VINTR];
47	v.c_cc[_VQUIT]  = termios->c_cc[VQUIT];
48	v.c_cc[_VERASE] = termios->c_cc[VERASE];
49	v.c_cc[_VKILL]  = termios->c_cc[VKILL];
50	v.c_cc[_VEOF]   = termios->c_cc[canon ? VEOF : VMIN];
51	v.c_cc[_VEOL]   = termios->c_cc[canon ? VEOL : VTIME];
52	v.c_cc[_VEOL2]  = termios->c_cc[VEOL2];
53	v.c_cc[_VSWTC]  = termios->c_cc[VSWTC];
54
55	return copy_to_user(termio, &v, sizeof(struct termio));
56}
57