src/multibyte/internal.c

   1 /*
   2  * This code was written by Rich Felker in 2010; no copyright is claimed.
   3  * This code is in the public domain. Attribution is appreciated but
   4  * unnecessary.
   5  */
   6
   7 #include "internal.h"
   8
   9 #define C(x) ( x<2 ? -1 : ( R(0x80,0xc0) | x ) )
  10 #define D(x) C((x+16))
  11 #define E(x) ( ( x==0 ? R(0xa0,0xc0) : \
  12                  x==0xd ? R(0x80,0xa0) : \
  13                  R(0x80,0xc0) ) \
  14              | ( R(0x80,0xc0) >> 6 ) \
  15              | x )
  16 #define F(x) ( ( x>=5 ? 0 : \
  17                  x==0 ? R(0x90,0xc0) : \
  18                  x==4 ? R(0x80,0xa0) : \
  19                  R(0x80,0xc0) ) \
  20              | ( R(0x80,0xc0) >> 6 ) \
  21              | ( R(0x80,0xc0) >> 12 ) \
  22              | x )
  23
  24 const uint32_t bittab[] = {
  25                       C(0x2),C(0x3),C(0x4),C(0x5),C(0x6),C(0x7),
  26         C(0x8),C(0x9),C(0xa),C(0xb),C(0xc),C(0xd),C(0xe),C(0xf),
  27         D(0x0),D(0x1),D(0x2),D(0x3),D(0x4),D(0x5),D(0x6),D(0x7),
  28         D(0x8),D(0x9),D(0xa),D(0xb),D(0xc),D(0xd),D(0xe),D(0xf),
  29         E(0x0),E(0x1),E(0x2),E(0x3),E(0x4),E(0x5),E(0x6),E(0x7),
  30         E(0x8),E(0x9),E(0xa),E(0xb),E(0xc),E(0xd),E(0xe),E(0xf),
  31         F(0x0),F(0x1),F(0x2),F(0x3),F(0x4)
  32 };