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   1 /*
   2  * Copyright © 2017 Keith Packard <keithp@keithp.com>
   3  *
   4  * This program is free software; you can redistribute it and/or modify
   5  * it under the terms of the GNU General Public License as published by
   6  * the Free Software Foundation, either version 2 of the License, or
   7  * (at your option) any later version.
   8  *
   9  * This program is distributed in the hope that it will be useful, but
  10  * WITHOUT ANY WARRANTY; without even the implied warranty of
  11  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  12  * General Public License for more details.
  13  */
  14
  15 #include "ao_scheme.h"
  16 #include <math.h>
  17
  18 static void float_mark(void *addr)
  19 {
  20         (void) addr;
  21 }
  22
  23 static int float_size(void *addr)
  24 {
  25         if (!addr)
  26                 return 0;
  27         return sizeof (struct ao_scheme_float);
  28 }
  29
  30 static void float_move(void *addr)
  31 {
  32         (void) addr;
  33 }
  34
  35 const struct ao_scheme_type ao_scheme_float_type = {
  36         .mark = float_mark,
  37         .size = float_size,
  38         .move = float_move,
  39         .name = "float",
  40 };
  41
  42 #ifndef FLOAT_FORMAT
  43 #define FLOAT_FORMAT "%g"
  44 #endif
  45
  46 void
  47 ao_scheme_float_write(ao_poly p)
  48 {
  49         struct ao_scheme_float *f = ao_scheme_poly_float(p);
  50         float   v = f->value;
  51
  52         if (isnanf(v))
  53                 printf("+nan.0");
  54         else if (isinff(v)) {
  55                 if (v < 0)
  56                         printf("-");
  57                 else
  58                         printf("+");
  59                 printf("inf.0");
  60         } else
  61                 printf (FLOAT_FORMAT, v);
  62 }
  63
  64 float
  65 ao_scheme_poly_number(ao_poly p)
  66 {
  67         switch (ao_scheme_poly_base_type(p)) {
  68         case AO_SCHEME_INT:
  69                 return ao_scheme_poly_int(p);
  70         case AO_SCHEME_OTHER:
  71                 switch (ao_scheme_other_type(ao_scheme_poly_other(p))) {
  72                 case AO_SCHEME_BIGINT:
  73                         return ao_scheme_bigint_int(ao_scheme_poly_bigint(p)->value);
  74                 case AO_SCHEME_FLOAT:
  75                         return ao_scheme_poly_float(p)->value;
  76                 }
  77         }
  78         return NAN;
  79 }
  80
  81 ao_poly
  82 ao_scheme_float_get(float value)
  83 {
  84         struct ao_scheme_float  *f;
  85
  86         f = ao_scheme_alloc(sizeof (struct ao_scheme_float));
  87         f->type = AO_SCHEME_FLOAT;
  88         f->value = value;
  89         return ao_scheme_float_poly(f);
  90 }
  91
  92 ao_poly
  93 ao_scheme_do_inexactp(struct ao_scheme_cons *cons)
  94 {
  95         if (!ao_scheme_check_argc(_ao_scheme_atom_led, cons, 1, 1))
  96                 return AO_SCHEME_NIL;
  97         if (ao_scheme_poly_type(ao_scheme_arg(cons, 0)) == AO_SCHEME_FLOAT)
  98                 return _ao_scheme_bool_true;
  99         return _ao_scheme_bool_false;
 100 }
 101
 102 ao_poly
 103 ao_scheme_do_finitep(struct ao_scheme_cons *cons)
 104 {
 105         ao_poly value;
 106         float   f;
 107
 108         if (!ao_scheme_check_argc(_ao_scheme_atom_led, cons, 1, 1))
 109                 return AO_SCHEME_NIL;
 110         value = ao_scheme_arg(cons, 0);
 111         switch (ao_scheme_poly_type(value)) {
 112         case AO_SCHEME_INT:
 113         case AO_SCHEME_BIGINT:
 114                 return _ao_scheme_bool_true;
 115         case AO_SCHEME_FLOAT:
 116                 f = ao_scheme_poly_float(value)->value;
 117                 if (!isnan(f) && !isinf(f))
 118                         return _ao_scheme_bool_true;
 119         }
 120         return _ao_scheme_bool_false;
 121 }
 122
 123 ao_poly
 124 ao_scheme_do_infinitep(struct ao_scheme_cons *cons)
 125 {
 126         ao_poly value;
 127         float   f;
 128
 129         if (!ao_scheme_check_argc(_ao_scheme_atom_led, cons, 1, 1))
 130                 return AO_SCHEME_NIL;
 131         value = ao_scheme_arg(cons, 0);
 132         switch (ao_scheme_poly_type(value)) {
 133         case AO_SCHEME_FLOAT:
 134                 f = ao_scheme_poly_float(value)->value;
 135                 if (isinf(f))
 136                         return _ao_scheme_bool_true;
 137         }
 138         return _ao_scheme_bool_false;
 139 }
 140
 141 ao_poly
 142 ao_scheme_do_sqrt(struct ao_scheme_cons *cons)
 143 {
 144         ao_poly value;
 145
 146         if (!ao_scheme_check_argc(_ao_scheme_atom_sqrt, cons, 1, 1))
 147                 return AO_SCHEME_NIL;
 148         value = ao_scheme_arg(cons, 0);
 149         if (!ao_scheme_number_typep(ao_scheme_poly_type(value)))
 150                 return ao_scheme_error(AO_SCHEME_INVALID, "%s: non-numeric", ao_scheme_poly_atom(_ao_scheme_atom_sqrt)->name);
 151         return ao_scheme_float_get(sqrtf(ao_scheme_poly_number(value)));
 152 }