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  */
  15 static 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  */
  51 static 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 */