libtu/np/np-conv.h

   1 /*
   2  * libtu/np-conv.h
   3  *
   4  * Copyright (c) Tuomo Valkonen 1999-2002.
   5  *
   6  * You may distribute and modify this library under the terms of either
   7  * the Clarified Artistic License or the GNU LGPL, version 2.1 or later.
   8  */
   9
  10 #include <math.h>
  11
  12 #ifdef NP_SIMPLE_IMPL
  13
  14 #define FN_NUM_TO_SIGNED(T, UMAX, MAX, MIN)                          \
  15  static int num_to_##T(T *ret, const NPNum *num, bool allow_uns_big) \
  16  {                                                                   \
  17     if(num->type!=NPNUM_INT)                                         \
  18         return E_TOKZ_NOTINT;                                        \
  19                                                                      \
  20     if(!num->negative){                                              \
  21         *ret=num->ival;                                              \
  22         if(allow_uns_big?num->ival>UMAX:num->ival>MAX)               \
  23         return E_TOKZ_RANGE;                                         \
  24     }else{                                                           \
  25         *ret=-num->ival;                                             \
  26         if(num->ival>-(ulong)MIN)                                    \
  27         return E_TOKZ_RANGE;                                         \
  28     }                                                                \
  29     return 0;                                                        \
  30  }
  31
  32 #define FN_NUM_TO_UNSIGNED(T, UMAX, MIN)                         \
  33  static int num_to_##T(T *ret, const NPNum *num, bool allow_neg) \
  34  {                                                               \
  35     if(num->type!=NPNUM_INT)                                     \
  36         return E_TOKZ_NOTINT;                                    \
  37                                                                  \
  38     if(!num->negative){                                          \
  39         *ret=num->ival;                                          \
  40         if(num->ival>UMAX)                                       \
  41         return E_TOKZ_RANGE;                                     \
  42     }else{                                                       \
  43         *ret=-num->ival;                                         \
  44         if(!allow_neg || num->ival>(ulong)-MIN)                  \
  45         return E_TOKZ_RANGE;                                     \
  46     }                                                            \
  47     return 0;                                                    \
  48  }
  49
  50 #define FN_NUM_TO_FLOAT(T, POW)                  \
  51  static int num_to_##T(T *ret, const NPNum *num) \
  52  {                                               \
  53     *ret=(num->negative?-num->fval:num->fval);   \
  54     return 0;                                    \
  55  }
  56
  57 #else /* NP_SIMPLE_IMPL */
  58
  59 #define FN_NUM_TO_SIGNED(T, UMAX, MAX, MIN)                          \
  60  static int num_to_##T(T *ret, const NPNum *num, bool allow_uns_big) \
  61  {                                                                   \
  62     if(num->exponent)                                                \
  63         return E_TOKZ_NOTINT;                                        \
  64     if(num->nmantissa>0)                                             \
  65         return E_TOKZ_RANGE;                                         \
  66                                                                      \
  67     if(!num->negative){                                              \
  68         *ret=num->mantissa[0];                                       \
  69         if(allow_uns_big?num->mantissa[0]>UMAX:num->mantissa[0]>MAX) \
  70             return E_TOKZ_RANGE;                                     \
  71     }else{                                                           \
  72         *ret=-num->mantissa[0];                                      \
  73         if(num->mantissa[0]>-(ulong)MIN)                             \
  74             return E_TOKZ_RANGE;                                     \
  75     }                                                                \
  76     return 0;                                                        \
  77 }
  78
  79 #define FN_NUM_TO_UNSIGNED(T, UMAX, MIN)                         \
  80  static int num_to_##T(T *ret, const NPNum *num, bool allow_neg) \
  81  {                                                               \
  82     if(num->exponent)                                            \
  83         return E_TOKZ_NOTINT;                                    \
  84     if(num->nmantissa>0)                                         \
  85         return E_TOKZ_RANGE;                                     \
  86                                                                  \
  87     if(!num->negative){                                          \
  88         *ret=num->mantissa[0];                                   \
  89         if(num->mantissa[0]>UMAX)                                \
  90             return E_TOKZ_RANGE;                                 \
  91     }else{                                                       \
  92         *ret=-num->mantissa[0];                                  \
  93         if(!allow_neg || num->mantissa[0]>(ulong)-MIN)           \
  94             return E_TOKZ_RANGE;                                 \
  95     }                                                            \
  96     return 0;                                                    \
  97 }
  98
  99
 100 #define FN_NUM_TO_FLOAT(T, POW)                  \
 101  static int num_to_##T(T *ret, const NPNum *num) \
 102  {                                               \
 103     T d=0;                                       \
 104     int i;                                       \
 105                                                  \
 106     for(i=num->nmantissa;i>=0;i--)               \
 107         d=d*(T)(ULONG_MAX+1.0)+num->mantissa[i]; \
 108                                                  \
 109     d*=POW(num->base, num->exponent);            \
 110     *ret=d;                                      \
 111                                                  \
 112     return 0;                                    \
 113  }
 114
 115 #endif /* NP_SIMPLE_IMPL */
 116
 117 FN_NUM_TO_SIGNED(long, ULONG_MAX, LONG_MAX, LONG_MIN)
 118 FN_NUM_TO_SIGNED(char, UCHAR_MAX, CHAR_MAX, CHAR_MIN)
 119 FN_NUM_TO_FLOAT(double, pow)
 120
 121 #undef NEG