src/integer/conv/cl_I_to_UL.cc

   1 // cl_I_to_UL().
   2
   3 // General includes.
   4 #include "cl_sysdep.h"
   5
   6 // Specification.
   7 #include "cln/integer.h"
   8
   9
  10 // Implementation.
  11
  12 #include "cln/number.h"
  13 #include "cl_I.h"
  14 #include "cl_DS.h"
  15 #include "cln/io.h"
  16 #include "cln/integer_io.h"
  17 #include "cln/abort.h"
  18
  19 namespace cln {
  20
  21 uint32 cl_I_to_UL (const cl_I& obj)
  22 {
  23         if (fixnump(obj)) {
  24                 // Fixnum
  25                 var sint32 wert = FN_to_L(obj);
  26                 if (wert >= 0)
  27                         return (uint32)wert;
  28                 goto bad;
  29         } else { // Bignum
  30                 var cl_heap_bignum* bn = TheBignum(obj);
  31                 var uintC len = bn->length;
  32                 if ((sintD)mspref(arrayMSDptr(bn->data,len),0) < 0)
  33                         goto bad;
  34                 #define IF_LENGTH(i)  \
  35                   if (bn_minlength <= i) /* genau i Digits überhaupt möglich? */\
  36                     if (len == i) /* genau i Digits? */                         \
  37                       /* 2^((i-1)*intDsize-1) <= obj < 2^(i*intDsize-1) */      \
  38                       if ( (i*intDsize-1 > 32)                                  \
  39                            && ( ((i-1)*intDsize-1 >= 32)                        \
  40                                 || (mspref(arrayMSDptr(bn->data,len),0) >= (uintD)bitc(32-(i-1)*intDsize)) \
  41                          )    )                                                 \
  42                         goto bad;                                               \
  43                         else
  44                 IF_LENGTH(1)
  45                         return get_uint1D_Dptr(arrayLSDptr(bn->data,1));
  46                 IF_LENGTH(2)
  47                         return get_uint2D_Dptr(arrayLSDptr(bn->data,2));
  48                 IF_LENGTH(3)
  49                         return get_uint3D_Dptr(arrayLSDptr(bn->data,3));
  50                 IF_LENGTH(4)
  51                         return get_uint4D_Dptr(arrayLSDptr(bn->data,4));
  52                 IF_LENGTH(5)
  53                         return get_uint4D_Dptr(arrayLSDptr(bn->data,5));
  54                 #undef IF_LENGTH
  55         }
  56         bad: // unpassendes Objekt
  57         fprint(std::cerr, "Not a 32-bit integer: ");
  58         fprint(std::cerr, obj);
  59         fprint(std::cerr, "\n");
  60         cl_abort();
  61 }
  62
  63 }  // namespace cln