git.gag.com Git - fw/altos/blob - src/scheme/ao_scheme_float.c

   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 #ifdef AO_SCHEME_FEATURE_FLOAT
  19
  20 static void float_mark(void *addr)
  21 {
  22         (void) addr;
  23 }
  24
  25 static int float_size(void *addr)
  26 {
  27         if (!addr)
  28                 return 0;
  29         return sizeof (struct ao_scheme_float);
  30 }
  31
  32 static void float_move(void *addr)
  33 {
  34         (void) addr;
  35 }
  36
  37 const struct ao_scheme_type ao_scheme_float_type = {
  38         .mark = float_mark,
  39         .size = float_size,
  40         .move = float_move,
  41         .name = "float",
  42 };
  43
  44 #ifndef FLOAT_FORMAT
  45 #define FLOAT_FORMAT "%g"
  46 #endif
  47
  48 void
  49 ao_scheme_float_write(ao_poly p)
  50 {
  51         struct ao_scheme_float *f = ao_scheme_poly_float(p);
  52         float   v = f->value;
  53
  54         if (isnanf(v))
  55                 printf("+nan.0");
  56         else if (isinff(v)) {
  57                 if (v < 0)
  58                         printf("-");
  59                 else
  60                         printf("+");
  61                 printf("inf.0");
  62         } else
  63                 printf (FLOAT_FORMAT, v);
  64 }
  65
  66 float
  67 ao_scheme_poly_number(ao_poly p)
  68 {
  69         switch (ao_scheme_poly_base_type(p)) {
  70         case AO_SCHEME_INT:
  71                 return ao_scheme_poly_int(p);
  72         case AO_SCHEME_OTHER:
  73                 switch (ao_scheme_other_type(ao_scheme_poly_other(p))) {
  74                 case AO_SCHEME_BIGINT:
  75                         return ao_scheme_bigint_int(ao_scheme_poly_bigint(p)->value);
  76                 case AO_SCHEME_FLOAT:
  77                         return ao_scheme_poly_float(p)->value;
  78                 }
  79         }
  80         return NAN;
  81 }
  82
  83 ao_poly
  84 ao_scheme_float_get(float value)
  85 {
  86         struct ao_scheme_float  *f;
  87
  88         f = ao_scheme_alloc(sizeof (struct ao_scheme_float));
  89         f->type = AO_SCHEME_FLOAT;
  90         f->value = value;
  91         return ao_scheme_float_poly(f);
  92 }
  93
  94 ao_poly
  95 ao_scheme_do_inexactp(struct ao_scheme_cons *cons)
  96 {
  97         if (!ao_scheme_check_argc(_ao_scheme_atom_led, cons, 1, 1))
  98                 return AO_SCHEME_NIL;
  99         if (ao_scheme_poly_type(ao_scheme_arg(cons, 0)) == AO_SCHEME_FLOAT)
 100                 return _ao_scheme_bool_true;
 101         return _ao_scheme_bool_false;
 102 }
 103
 104 ao_poly
 105 ao_scheme_do_finitep(struct ao_scheme_cons *cons)
 106 {
 107         ao_poly value;
 108         float   f;
 109
 110         if (!ao_scheme_check_argc(_ao_scheme_atom_led, cons, 1, 1))
 111                 return AO_SCHEME_NIL;
 112         value = ao_scheme_arg(cons, 0);
 113         switch (ao_scheme_poly_type(value)) {
 114         case AO_SCHEME_INT:
 115         case AO_SCHEME_BIGINT:
 116                 return _ao_scheme_bool_true;
 117         case AO_SCHEME_FLOAT:
 118                 f = ao_scheme_poly_float(value)->value;
 119                 if (!isnan(f) && !isinf(f))
 120                         return _ao_scheme_bool_true;
 121         }
 122         return _ao_scheme_bool_false;
 123 }
 124
 125 ao_poly
 126 ao_scheme_do_infinitep(struct ao_scheme_cons *cons)
 127 {
 128         ao_poly value;
 129         float   f;
 130
 131         if (!ao_scheme_check_argc(_ao_scheme_atom_led, cons, 1, 1))
 132                 return AO_SCHEME_NIL;
 133         value = ao_scheme_arg(cons, 0);
 134         switch (ao_scheme_poly_type(value)) {
 135         case AO_SCHEME_FLOAT:
 136                 f = ao_scheme_poly_float(value)->value;
 137                 if (isinf(f))
 138                         return _ao_scheme_bool_true;
 139         }
 140         return _ao_scheme_bool_false;
 141 }
 142
 143 ao_poly
 144 ao_scheme_do_sqrt(struct ao_scheme_cons *cons)
 145 {
 146         ao_poly value;
 147
 148         if (!ao_scheme_check_argc(_ao_scheme_atom_sqrt, cons, 1, 1))
 149                 return AO_SCHEME_NIL;
 150         value = ao_scheme_arg(cons, 0);
 151         if (!ao_scheme_number_typep(ao_scheme_poly_type(value)))
 152                 return ao_scheme_error(AO_SCHEME_INVALID, "%s: non-numeric", ao_scheme_poly_atom(_ao_scheme_atom_sqrt)->name);
 153         return ao_scheme_float_get(sqrtf(ao_scheme_poly_number(value)));
 154 }
 155 #endif