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(FILE *out, ao_poly p, bool write)
  50 {
  51         struct ao_scheme_float *f = ao_scheme_poly_float(p);
  52         float   v = f->value;
  53
  54         (void) write;
  55         if (isnanf(v))
  56                 fputs("+nan.0", out);
  57         else if (isinff(v)) {
  58                 if (v < 0)
  59                         putc('-', out);
  60                 else
  61                         putc('+', out);
  62                 fputs("inf.0", out);
  63         } else
  64                 fprintf(out, FLOAT_FORMAT, v);
  65 }
  66
  67 float
  68 ao_scheme_poly_number(ao_poly p)
  69 {
  70         switch (ao_scheme_poly_base_type(p)) {
  71         case AO_SCHEME_INT:
  72                 return ao_scheme_poly_int(p);
  73         case AO_SCHEME_BIGINT:
  74                 return ao_scheme_poly_bigint(p)->value;
  75         case AO_SCHEME_OTHER:
  76                 switch (ao_scheme_other_type(ao_scheme_poly_other(p))) {
  77                 case AO_SCHEME_FLOAT:
  78                         return ao_scheme_poly_float(p)->value;
  79                 }
  80         }
  81         return NAN;
  82 }
  83
  84 ao_poly
  85 ao_scheme_float_get(float value)
  86 {
  87         struct ao_scheme_float  *f;
  88
  89         f = ao_scheme_alloc(sizeof (struct ao_scheme_float));
  90         f->type = AO_SCHEME_FLOAT;
  91         f->value = value;
  92         return ao_scheme_float_poly(f);
  93 }
  94
  95 ao_poly
  96 ao_scheme_do_inexactp(struct ao_scheme_cons *cons)
  97 {
  98         ao_poly val;
  99
 100         if (!ao_scheme_parse_args(_ao_scheme_atom_inexact3f, cons,
 101                                   AO_SCHEME_POLY, &val,
 102                                   AO_SCHEME_ARG_END))
 103                 return AO_SCHEME_NIL;
 104         if (ao_scheme_poly_type(val) == AO_SCHEME_FLOAT)
 105                 return _ao_scheme_bool_true;
 106         return _ao_scheme_bool_false;
 107 }
 108
 109 ao_poly
 110 ao_scheme_do_finitep(struct ao_scheme_cons *cons)
 111 {
 112         ao_poly val;
 113         float   f;
 114
 115         if (!ao_scheme_parse_args(_ao_scheme_atom_inexact3f, cons,
 116                                   AO_SCHEME_POLY, &val,
 117                                   AO_SCHEME_ARG_END))
 118                 return AO_SCHEME_NIL;
 119         switch (ao_scheme_poly_type(val)) {
 120         case AO_SCHEME_INT:
 121         case AO_SCHEME_BIGINT:
 122                 return _ao_scheme_bool_true;
 123         case AO_SCHEME_FLOAT:
 124                 f = ao_scheme_poly_float(val)->value;
 125                 if (!isnan(f) && !isinf(f))
 126                         return _ao_scheme_bool_true;
 127         }
 128         return _ao_scheme_bool_false;
 129 }
 130
 131 ao_poly
 132 ao_scheme_do_infinitep(struct ao_scheme_cons *cons)
 133 {
 134         ao_poly val;
 135         float   f;
 136
 137         if (!ao_scheme_parse_args(_ao_scheme_atom_inexact3f, cons,
 138                                   AO_SCHEME_POLY, &val,
 139                                   AO_SCHEME_ARG_END))
 140                 return AO_SCHEME_NIL;
 141         switch (ao_scheme_poly_type(val)) {
 142         case AO_SCHEME_FLOAT:
 143                 f = ao_scheme_poly_float(val)->value;
 144                 if (isinf(f))
 145                         return _ao_scheme_bool_true;
 146         }
 147         return _ao_scheme_bool_false;
 148 }
 149
 150 ao_poly
 151 ao_scheme_do_sqrt(struct ao_scheme_cons *cons)
 152 {
 153         float   f;
 154
 155         if (!ao_scheme_parse_args(_ao_scheme_atom_sqrt, cons,
 156                                   AO_SCHEME_FLOAT, &f,
 157                                   AO_SCHEME_ARG_END))
 158                 return AO_SCHEME_NIL;
 159         return ao_scheme_float_get(sqrtf(f));
 160 }
 161 #endif