1// SPDX-License-Identifier: GPL-2.0
2#include <linux/termios_internal.h>
3
4/*
5 * c_cc characters in the termio structure.  Oh, how I love being
6 * backwardly compatible.  Notice that character 4 and 5 are
7 * interpreted differently depending on whether ICANON is set in
8 * c_lflag.  If it's set, they are used as _VEOF and _VEOL, otherwise
9 * as _VMIN and V_TIME.  This is for compatibility with OSF/1 (which
10 * is compatible with sysV)...
11 */
12#define _VMIN	4
13#define _VTIME	5
14
15int kernel_termios_to_user_termio(struct termio __user *termio,
16						struct ktermios *termios)
17{
18	struct termio v;
19	memset(&v, 0, sizeof(struct termio));
20	v.c_iflag = termios->c_iflag;
21	v.c_oflag = termios->c_oflag;
22	v.c_cflag = termios->c_cflag;
23	v.c_lflag = termios->c_lflag;
24	v.c_line = termios->c_line;
25	memcpy(v.c_cc, termios->c_cc, NCC);
26	if (!(v.c_lflag & ICANON)) {
27		v.c_cc[_VMIN] = termios->c_cc[VMIN];
28		v.c_cc[_VTIME] = termios->c_cc[VTIME];
29	}
30	return copy_to_user(termio, &v, sizeof(struct termio));
31}
32
33int user_termios_to_kernel_termios(struct ktermios *k,
34						 struct termios2 __user *u)
35{
36	int err;
37	err  = get_user(k->c_iflag, &u->c_iflag);
38	err |= get_user(k->c_oflag, &u->c_oflag);
39	err |= get_user(k->c_cflag, &u->c_cflag);
40	err |= get_user(k->c_lflag, &u->c_lflag);
41	err |= get_user(k->c_line,  &u->c_line);
42	err |= copy_from_user(k->c_cc, u->c_cc, NCCS);
43	if (k->c_lflag & ICANON) {
44		err |= get_user(k->c_cc[VEOF], &u->c_cc[VEOF]);
45		err |= get_user(k->c_cc[VEOL], &u->c_cc[VEOL]);
46	} else {
47		err |= get_user(k->c_cc[VMIN],  &u->c_cc[_VMIN]);
48		err |= get_user(k->c_cc[VTIME], &u->c_cc[_VTIME]);
49	}
50	err |= get_user(k->c_ispeed,  &u->c_ispeed);
51	err |= get_user(k->c_ospeed,  &u->c_ospeed);
52	return err;
53}
54
55int kernel_termios_to_user_termios(struct termios2 __user *u,
56						 struct ktermios *k)
57{
58	int err;
59	err  = put_user(k->c_iflag, &u->c_iflag);
60	err |= put_user(k->c_oflag, &u->c_oflag);
61	err |= put_user(k->c_cflag, &u->c_cflag);
62	err |= put_user(k->c_lflag, &u->c_lflag);
63	err |= put_user(k->c_line, &u->c_line);
64	err |= copy_to_user(u->c_cc, k->c_cc, NCCS);
65	if (!(k->c_lflag & ICANON)) {
66		err |= put_user(k->c_cc[VMIN],  &u->c_cc[_VMIN]);
67		err |= put_user(k->c_cc[VTIME], &u->c_cc[_VTIME]);
68	} else {
69		err |= put_user(k->c_cc[VEOF], &u->c_cc[VEOF]);
70		err |= put_user(k->c_cc[VEOL], &u->c_cc[VEOL]);
71	}
72	err |= put_user(k->c_ispeed, &u->c_ispeed);
73	err |= put_user(k->c_ospeed, &u->c_ospeed);
74	return err;
75}
76
77int user_termios_to_kernel_termios_1(struct ktermios *k,
78						 struct termios __user *u)
79{
80	int err;
81	err  = get_user(k->c_iflag, &u->c_iflag);
82	err |= get_user(k->c_oflag, &u->c_oflag);
83	err |= get_user(k->c_cflag, &u->c_cflag);
84	err |= get_user(k->c_lflag, &u->c_lflag);
85	err |= get_user(k->c_line,  &u->c_line);
86	err |= copy_from_user(k->c_cc, u->c_cc, NCCS);
87	if (k->c_lflag & ICANON) {
88		err |= get_user(k->c_cc[VEOF], &u->c_cc[VEOF]);
89		err |= get_user(k->c_cc[VEOL], &u->c_cc[VEOL]);
90	} else {
91		err |= get_user(k->c_cc[VMIN],  &u->c_cc[_VMIN]);
92		err |= get_user(k->c_cc[VTIME], &u->c_cc[_VTIME]);
93	}
94	return err;
95}
96
97int kernel_termios_to_user_termios_1(struct termios __user *u,
98						 struct ktermios *k)
99{
100	int err;
101	err  = put_user(k->c_iflag, &u->c_iflag);
102	err |= put_user(k->c_oflag, &u->c_oflag);
103	err |= put_user(k->c_cflag, &u->c_cflag);
104	err |= put_user(k->c_lflag, &u->c_lflag);
105	err |= put_user(k->c_line, &u->c_line);
106	err |= copy_to_user(u->c_cc, k->c_cc, NCCS);
107	if (!(k->c_lflag & ICANON)) {
108		err |= put_user(k->c_cc[VMIN],  &u->c_cc[_VMIN]);
109		err |= put_user(k->c_cc[VTIME], &u->c_cc[_VTIME]);
110	} else {
111		err |= put_user(k->c_cc[VEOF], &u->c_cc[VEOF]);
112		err |= put_user(k->c_cc[VEOL], &u->c_cc[VEOL]);
113	}
114	return err;
115}
116