get_put.h 1.1 KB

1234567891011121314151617181920212223242526272829303132333435363738394041
  1. /*
  2. (c) copyright 1988 by the Vrije Universiteit, Amsterdam, The Netherlands.
  3. See the copyright notice in the ACK home directory, in the file "Copyright".
  4. */
  5. /* $Id$ */
  6. #include <byte_order.h>
  7. #if CHAR_UNSIGNED
  8. #define Xchar(ch) (ch)
  9. #else
  10. #define Xchar(ch) ((ch) & 0377)
  11. #endif
  12. #define BYTES_REVERSED (MSB_AT_LOW_ADDRESS != FL_MSB_AT_LOW_ADDRESS)
  13. #define WORDS_REVERSED (MSW_AT_LOW_ADDRESS != FL_MSW_AT_LOW_ADDRESS)
  14. #define LONGS_REVERSED (FL_MSL_AT_LOW_ADDRESS)
  15. #if BYTES_REVERSED
  16. #define uget2(c) (Xchar((c)[1]) | ((unsigned) Xchar((c)[0]) << 8))
  17. #define Xput2(i, c) (((c)[1] = (i)), ((c)[0] = (i) >> 8))
  18. #define put2(i, c) { register int j = (i); Xput2(j, c); }
  19. #else
  20. #define uget2(c) (* ((unsigned short *) (c)))
  21. #define Xput2(i, c) (* ((short *) (c)) = (i))
  22. #define put2(i, c) Xput2(i, c)
  23. #endif
  24. #define get2(c) ((short) uget2(c))
  25. #if WORDS_REVERSED || BYTES_REVERSED
  26. #define get4(c) (uget2((c)+2) | ((long) uget2(c) << 16))
  27. #define put4(l, c) { register long x=(l); \
  28. Xput2((int)x,(c)+2); \
  29. Xput2((int)(x>>16),(c)); \
  30. }
  31. #else
  32. #define get4(c) (* ((long *) (c)))
  33. #define put4(l, c) (* ((long *) (c)) = (l))
  34. #endif