Mercurial > octave
annotate liboctave/system/cmach-info.c @ 28223:45763d59cb4f stable
use nullptr instead of NULL or 0 in a few more places
* QWinTerminalImpl.cpp, oct-procbuf.cc, audioread.cc, jit-typeinfo.cc,
lo-sysdep.cc, url-transfer.cc, shared-fcns.h: Replace NULL and 0 with
nullptr where appropriate.
author | John W. Eaton <jwe@octave.org> |
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date | Wed, 15 Apr 2020 15:55:32 -0400 |
parents | bd51beb6205e |
children | 0a5b15007766 |
rev | line source |
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1 //////////////////////////////////////////////////////////////////////// |
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2 // |
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3 // Copyright (C) 1996-2020 The Octave Project Developers |
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4 // |
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5 // See the file COPYRIGHT.md in the top-level directory of this |
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6 // distribution or <https://octave.org/copyright/>. |
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7 // |
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8 // This file is part of Octave. |
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9 // |
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10 // Octave is free software: you can redistribute it and/or modify it |
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11 // under the terms of the GNU General Public License as published by |
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12 // the Free Software Foundation, either version 3 of the License, or |
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13 // (at your option) any later version. |
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14 // |
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15 // Octave is distributed in the hope that it will be useful, but |
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16 // WITHOUT ANY WARRANTY; without even the implied warranty of |
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17 // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
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18 // GNU General Public License for more details. |
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19 // |
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20 // You should have received a copy of the GNU General Public License |
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21 // along with Octave; see the file COPYING. If not, see |
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22 // <https://www.gnu.org/licenses/>. |
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23 // |
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24 //////////////////////////////////////////////////////////////////////// |
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25 |
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26 #if defined (HAVE_CONFIG_H) |
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27 # include "config.h" |
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28 #endif |
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29 |
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30 #include <stdint.h> |
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31 |
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32 #include "cmach-info.h" |
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33 #include "f77-fcn.h" |
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34 |
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35 extern double F77_FUNC (d1mach, D1MACH) (const F77_INT*); |
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36 |
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37 typedef union |
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38 { |
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39 double d; |
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40 int32_t i[2]; |
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41 } equiv; |
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42 |
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43 typedef struct |
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44 { |
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45 int fp_fmt; |
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46 equiv fp_par[4]; |
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47 } float_params; |
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48 |
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49 #define INIT_FLT_PAR(fp, fmt, sm1, sm2, lrg1, lrg2, rt1, rt2, dv1, dv2) \ |
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50 do \ |
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51 { \ |
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52 fp.fp_fmt = (fmt); \ |
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53 fp.fp_par[0].i[0] = (sm1); fp.fp_par[0].i[1] = (sm2); \ |
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54 fp.fp_par[1].i[0] = (lrg1); fp.fp_par[1].i[1] = (lrg2); \ |
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55 fp.fp_par[2].i[0] = (rt1); fp.fp_par[2].i[1] = (rt2); \ |
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56 fp.fp_par[3].i[0] = (dv1); fp.fp_par[3].i[1] = (dv2); \ |
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57 } \ |
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58 while (0) |
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59 |
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60 static int equiv_compare (const equiv *std, const equiv *v, int len) |
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61 { |
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62 int i; |
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63 for (i = 0; i < len; i++) |
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64 if (v[i].i[0] != std[i].i[0] || v[i].i[1] != std[i].i[1]) |
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65 return 0; |
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66 return 1; |
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67 } |
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68 |
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69 // Return 0 if the floating point format is unknown, 1 if it is IEEE |
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70 // little endian, or 2 if it is IEEE big endian. |
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71 // |
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72 // If the return values change, you must also change the values of the |
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73 // float format enum in mach-info.h and the correspondence between the |
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74 // integer and enum values in octave::mach_info::get_float_format. |
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75 |
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76 int |
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77 octave_get_float_format (void) |
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78 { |
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79 int retval = 0; |
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80 |
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81 float_params fp[3]; |
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82 |
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83 INIT_FLT_PAR (fp[0], 1, |
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84 0, 1048576, |
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85 -1, 2146435071, |
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86 0, 1017118720, |
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87 0, 1018167296); |
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88 |
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89 INIT_FLT_PAR (fp[1], 2, |
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90 1048576, 0, |
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91 2146435071, -1, |
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92 1017118720, 0, |
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93 1018167296, 0); |
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94 |
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95 INIT_FLT_PAR (fp[2], 0, |
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96 0, 0, |
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97 0, 0, |
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98 0, 0, |
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99 0, 0); |
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100 |
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101 equiv mach_fp_par[4]; |
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102 |
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103 F77_INT opt; |
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104 |
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105 opt = 1; |
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106 mach_fp_par[0].d = F77_FUNC (d1mach, D1MACH) (&opt); |
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107 |
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108 opt = 2; |
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109 mach_fp_par[1].d = F77_FUNC (d1mach, D1MACH) (&opt); |
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110 |
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111 opt = 3; |
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112 mach_fp_par[2].d = F77_FUNC (d1mach, D1MACH) (&opt); |
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113 |
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114 opt = 4; |
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115 mach_fp_par[3].d = F77_FUNC (d1mach, D1MACH) (&opt); |
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116 |
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117 int i = 0; |
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118 do |
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119 { |
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120 if (equiv_compare (fp[i].fp_par, mach_fp_par, 4)) |
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121 { |
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122 retval = fp[i].fp_fmt; |
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123 break; |
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124 } |
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125 } |
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126 while (fp[++i].fp_fmt != 0); |
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127 |
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128 return retval; |
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129 } |
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130 |
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131 int |
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132 octave_is_big_endian (void) |
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133 { |
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134 // Are we little or big endian? From Harbison & Steele. |
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135 |
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136 union |
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137 { |
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138 long l; |
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139 char c[sizeof (long)]; |
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140 } u; |
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141 |
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142 u.l = 1; |
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143 |
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144 return (u.c[sizeof (long) - 1] == 1); |
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145 } |