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}