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annotate src/number-gmp.c @ 5118:e0db3c197671 ben-lisp-object

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merge up to latest default branch, doesn't compile yet
author Ben Wing <ben@xemacs.org>
date Sat, 26 Dec 2009 21:18:49 -0600
parents 313c2cc696b9
children 2fc0e2f18322
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
rev   line source
1983
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1 /* Numeric types for XEmacs using the GNU MP library.
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2 Copyright (C) 2004 Jerry James.
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3
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4 This file is part of XEmacs.
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5
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6 XEmacs is free software; you can redistribute it and/or modify it
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7 under the terms of the GNU General Public License as published by the
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8 Free Software Foundation; either version 2, or (at your option) any
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9 later version.
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10
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11 XEmacs is distributed in the hope that it will be useful, but WITHOUT
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12 ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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13 FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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14 for more details.
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15
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16 You should have received a copy of the GNU General Public License
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17 along with XEmacs; see the file COPYING. If not, write to
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18 the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
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19 Boston, MA 02111-1307, USA. */
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20
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21 /* Synched up with: Not in FSF. */
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22
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23 #include <config.h>
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24 #include <limits.h>
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25 #include <math.h>
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26 #include "lisp.h"
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27 #include "sysproc.h" /* For qxe_getpid */
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28
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29 static mp_exp_t float_print_min, float_print_max;
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30 gmp_randstate_t random_state;
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31
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32 CIbyte *
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33 bigfloat_to_string(mpf_t f, int base)
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34 {
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35 mp_exp_t expt;
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36 CIbyte *str = mpf_get_str (NULL, &expt, base, 0, f);
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37 const int sign = mpf_sgn (f);
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38 const int neg = (sign < 0) ? 1 : 0;
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39 int len = strlen (str) + 1; /* Count the null terminator */
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40
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41 if (sign == 0)
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42 {
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43 XREALLOC_ARRAY (str, CIbyte, 4);
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44 strncpy (str, "0.0", 4);
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45 }
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46 else if (float_print_min <= expt && expt <= float_print_max)
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47 {
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48 if (expt < 0)
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49 {
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50 /* We need room for a radix point and leading zeroes */
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51 const int space = -expt + 2;
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52 XREALLOC_ARRAY (str, CIbyte, len + space);
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53 memmove (&str[space + neg], &str[neg], len - neg);
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54 memset (&str[neg], '0', space);
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55 str[neg + 1] = '.';
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56 }
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57 else if (len <= expt + neg + 1)
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58 {
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59 /* We need room for a radix point and trailing zeroes */
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60 XREALLOC_ARRAY (str, CIbyte, expt + neg + 3);
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61 memset (&str[len - 1], '0', expt + neg + 3 - len);
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62 str[expt + neg] = '.';
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63 str[expt + neg + 2] = '\0';
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64 }
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65 else
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66 {
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67 /* We just need room for a radix point */
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68 XREALLOC_ARRAY (str, CIbyte, len + 1);
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69 memmove (&str[expt + neg + 1], &str[expt + neg], len - (expt + neg));
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70 str[expt + neg] = '.';
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71 }
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72 }
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73 else
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74 {
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75 /* Computerized scientific notation: We need room for a possible radix
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76 point, format identifier, and exponent */
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77 /* GMP's idea of the exponent is 1 greater than scientific notation's */
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78 expt--;
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79 const int point = (len == neg + 2) ? 0 : 1;
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80 const int exponent = (expt < 0)
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81 ? (int)(log ((double) (-expt)) / log ((double) base)) + 3
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82 : (int)(log ((double) expt) / log ((double) base)) + 2;
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83 const int space = point + exponent;
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84 XREALLOC_ARRAY (str, CIbyte, len + space);
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85 if (point > 0)
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86 {
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87 memmove (&str[neg + 2], &str[neg + 1], len - neg);
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88 str[neg + 1] = '.';
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89 }
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90 sprintf (&str[len + point - 1], "E%ld", expt);
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91 }
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92 return str;
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93 }
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94
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95 /* We need the next two functions since GNU MP insists on giving us an extra
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96 parameter. */
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97 static void *gmp_realloc (void *ptr, size_t UNUSED (old_size), size_t new_size)
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98 {
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99 return xrealloc (ptr, new_size);
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100 }
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101
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102 static void gmp_free (void *ptr, size_t UNUSED (size))
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103 {
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104 xfree (ptr, void *);
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105 }
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106
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107 void
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108 init_number_gmp ()
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109 {
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110 mp_set_memory_functions ((void *(*) (size_t)) xmalloc, gmp_realloc,
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111 gmp_free);
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112
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113 /* Numbers with smaller exponents than this are printed in scientific
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114 notation. */
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115 float_print_min = -4;
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116
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117 /* Numbers with larger exponents than this are printed in scientific
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118 notation. */
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119 float_print_max = 8;
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120
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121 /* Prepare the bignum/bigfloat random number generator */
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122 gmp_randinit_default (random_state);
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123 gmp_randseed_ui (random_state, qxe_getpid () + time (NULL));
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124 }