include/asm-generic/termios.h

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