LXR linux/include/asm-generic/termios-base.h

   1/* SPDX-License-Identifier: GPL-2.0 */
   2/* termios.h: generic termios/termio user copying/translation
   3 */
   4
   5#ifndef _ASM_GENERIC_TERMIOS_BASE_H
   6#define _ASM_GENERIC_TERMIOS_BASE_H
   7
   8#include <linux/uaccess.h>
   9
  10#ifndef __ARCH_TERMIO_GETPUT
  11
  12/*
  13 * Translate a "termio" structure into a "termios". Ugh.
  14 */
  15static inline int user_termio_to_kernel_termios(struct ktermios *termios,
  16                                                struct termio __user *termio)
  17{
  18        unsigned short tmp;
  19
  20        if (get_user(tmp, &termio->c_iflag) < 0)
  21                goto fault;
  22        termios->c_iflag = (0xffff0000 & termios->c_iflag) | tmp;
  23
  24        if (get_user(tmp, &termio->c_oflag) < 0)
  25                goto fault;
  26        termios->c_oflag = (0xffff0000 & termios->c_oflag) | tmp;
  27
  28        if (get_user(tmp, &termio->c_cflag) < 0)
  29                goto fault;
  30        termios->c_cflag = (0xffff0000 & termios->c_cflag) | tmp;
  31
  32        if (get_user(tmp, &termio->c_lflag) < 0)
  33                goto fault;
  34        termios->c_lflag = (0xffff0000 & termios->c_lflag) | tmp;
  35
  36        if (get_user(termios->c_line, &termio->c_line) < 0)
  37                goto fault;
  38
  39        if (copy_from_user(termios->c_cc, termio->c_cc, NCC) != 0)
  40                goto fault;
  41
  42        return 0;
  43
  44 fault:
  45        return -EFAULT;
  46}
  47
  48/*
  49 * Translate a "termios" structure into a "termio". Ugh.
  50 */
  51static inline int kernel_termios_to_user_termio(struct termio __user *termio,
  52                                                struct ktermios *termios)
  53{
  54        if (put_user(termios->c_iflag, &termio->c_iflag) < 0 ||
  55            put_user(termios->c_oflag, &termio->c_oflag) < 0 ||
  56            put_user(termios->c_cflag, &termio->c_cflag) < 0 ||
  57            put_user(termios->c_lflag, &termio->c_lflag) < 0 ||
  58            put_user(termios->c_line,  &termio->c_line) < 0 ||
  59            copy_to_user(termio->c_cc, termios->c_cc, NCC) != 0)
  60                return -EFAULT;
  61
  62        return 0;
  63}
  64
  65#ifndef user_termios_to_kernel_termios
  66#define user_termios_to_kernel_termios(k, u) copy_from_user(k, u, sizeof(struct termios))
  67#endif
  68
  69#ifndef kernel_termios_to_user_termios
  70#define kernel_termios_to_user_termios(u, k) copy_to_user(u, k, sizeof(struct termios))
  71#endif
  72
  73#define user_termios_to_kernel_termios_1(k, u) copy_from_user(k, u, sizeof(struct termios))
  74#define kernel_termios_to_user_termios_1(u, k) copy_to_user(u, k, sizeof(struct termios))
  75
  76#endif  /* __ARCH_TERMIO_GETPUT */
  77
  78#endif /* _ASM_GENERIC_TERMIOS_BASE_H */
  79