lib/float/get_put.h

   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
   6 /* $Header$ */
   7
   8 #include <byte_order.h>
   9
  10 #if CHAR_UNSIGNED
  11 #define Xchar(ch)       (ch)
  12 #else
  13 #define Xchar(ch)       ((ch) & 0377)
  14 #endif
  15
  16 #define BYTES_REVERSED (MSB_AT_LOW_ADDRESS != FL_MSB_AT_LOW_ADDRESS)
  17 #define WORDS_REVERSED (MSW_AT_LOW_ADDRESS != FL_MSW_AT_LOW_ADDRESS)
  18 #define LONGS_REVERSED (FL_MSL_AT_LOW_ADDRESS)
  19
  20 #if BYTES_REVERSED
  21 #define uget2(c)        (Xchar((c)[1]) | ((unsigned) Xchar((c)[0]) << 8))
  22 #define Xput2(i, c)     (((c)[1] = (i)), ((c)[0] = (i) >> 8))
  23 #define put2(i, c)      { register int j = (i); Xput2(j, c); }
  24 #else
  25 #define uget2(c)        (* ((unsigned short *) (c)))
  26 #define Xput2(i, c)     (* ((short *) (c)) = (i))
  27 #define put2(i, c)      Xput2(i, c)
  28 #endif
  29
  30 #define get2(c)         ((short) uget2(c))
  31
  32 #if WORDS_REVERSED || BYTES_REVERSED
  33 #define get4(c)         (uget2((c)+2) | ((long) uget2(c) << 16))
  34 #define put4(l, c)      { register long x=(l); \
  35                           Xput2((int)x,(c)+2); \
  36                           Xput2((int)(x>>16),(c)); \
  37                         }
  38 #else
  39 #define get4(c)         (* ((long *) (c)))
  40 #define put4(l, c)      (* ((long *) (c)) = (l))
  41 #endif