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1 ------------------------------------------------------------------------------
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2 -- --
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3 -- GNAT RUN-TIME COMPONENTS --
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4 -- --
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5 -- A D A . T E X T _ I O . D E C I M A L _ A U X --
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6 -- --
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7 -- B o d y --
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8 -- --
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131
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9 -- Copyright (C) 1992-2018, Free Software Foundation, Inc. --
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111
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10 -- --
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11 -- GNAT is free software; you can redistribute it and/or modify it under --
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12 -- terms of the GNU General Public License as published by the Free Soft- --
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13 -- ware Foundation; either version 3, or (at your option) any later ver- --
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14 -- sion. GNAT is distributed in the hope that it will be useful, but WITH- --
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15 -- OUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY --
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16 -- or FITNESS FOR A PARTICULAR PURPOSE. --
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17 -- --
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18 -- As a special exception under Section 7 of GPL version 3, you are granted --
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19 -- additional permissions described in the GCC Runtime Library Exception, --
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20 -- version 3.1, as published by the Free Software Foundation. --
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21 -- --
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22 -- You should have received a copy of the GNU General Public License and --
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23 -- a copy of the GCC Runtime Library Exception along with this program; --
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24 -- see the files COPYING3 and COPYING.RUNTIME respectively. If not, see --
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25 -- <http://www.gnu.org/licenses/>. --
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26 -- --
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27 -- GNAT was originally developed by the GNAT team at New York University. --
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28 -- Extensive contributions were provided by Ada Core Technologies Inc. --
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29 -- --
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30 ------------------------------------------------------------------------------
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31
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32 with Ada.Text_IO.Generic_Aux; use Ada.Text_IO.Generic_Aux;
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33 with Ada.Text_IO.Float_Aux; use Ada.Text_IO.Float_Aux;
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34
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35 with System.Img_Dec; use System.Img_Dec;
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36 with System.Img_LLD; use System.Img_LLD;
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37 with System.Val_Dec; use System.Val_Dec;
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38 with System.Val_LLD; use System.Val_LLD;
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39
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40 package body Ada.Text_IO.Decimal_Aux is
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41
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42 -------------
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43 -- Get_Dec --
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44 -------------
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45
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46 function Get_Dec
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47 (File : File_Type;
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48 Width : Field;
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49 Scale : Integer) return Integer
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50 is
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51 Buf : String (1 .. Field'Last);
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52 Ptr : aliased Integer;
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53 Stop : Integer := 0;
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54 Item : Integer;
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55
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56 begin
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57 if Width /= 0 then
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58 Load_Width (File, Width, Buf, Stop);
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59 String_Skip (Buf, Ptr);
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60 else
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61 Load_Real (File, Buf, Stop);
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62 Ptr := 1;
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63 end if;
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64
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65 Item := Scan_Decimal (Buf, Ptr'Access, Stop, Scale);
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66 Check_End_Of_Field (Buf, Stop, Ptr, Width);
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67 return Item;
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68 end Get_Dec;
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69
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70 -------------
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71 -- Get_LLD --
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72 -------------
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73
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74 function Get_LLD
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75 (File : File_Type;
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76 Width : Field;
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77 Scale : Integer) return Long_Long_Integer
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78 is
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79 Buf : String (1 .. Field'Last);
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80 Ptr : aliased Integer;
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81 Stop : Integer := 0;
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82 Item : Long_Long_Integer;
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83
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84 begin
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85 if Width /= 0 then
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86 Load_Width (File, Width, Buf, Stop);
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87 String_Skip (Buf, Ptr);
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88 else
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89 Load_Real (File, Buf, Stop);
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90 Ptr := 1;
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91 end if;
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92
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93 Item := Scan_Long_Long_Decimal (Buf, Ptr'Access, Stop, Scale);
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94 Check_End_Of_Field (Buf, Stop, Ptr, Width);
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95 return Item;
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96 end Get_LLD;
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97
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98 --------------
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99 -- Gets_Dec --
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100 --------------
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101
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102 function Gets_Dec
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103 (From : String;
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104 Last : not null access Positive;
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105 Scale : Integer) return Integer
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106 is
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107 Pos : aliased Integer;
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108 Item : Integer;
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109
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110 begin
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111 String_Skip (From, Pos);
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112 Item := Scan_Decimal (From, Pos'Access, From'Last, Scale);
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113 Last.all := Pos - 1;
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114 return Item;
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115
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116 exception
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117 when Constraint_Error =>
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118 Last.all := Pos - 1;
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119 raise Data_Error;
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120 end Gets_Dec;
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121
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122 --------------
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123 -- Gets_LLD --
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124 --------------
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125
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126 function Gets_LLD
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127 (From : String;
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128 Last : not null access Positive;
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129 Scale : Integer) return Long_Long_Integer
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130 is
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131 Pos : aliased Integer;
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132 Item : Long_Long_Integer;
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133
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134 begin
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135 String_Skip (From, Pos);
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136 Item := Scan_Long_Long_Decimal (From, Pos'Access, From'Last, Scale);
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137 Last.all := Pos - 1;
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138 return Item;
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139
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140 exception
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141 when Constraint_Error =>
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142 Last.all := Pos - 1;
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143 raise Data_Error;
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144 end Gets_LLD;
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145
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146 -------------
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147 -- Put_Dec --
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148 -------------
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149
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150 procedure Put_Dec
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151 (File : File_Type;
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152 Item : Integer;
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153 Fore : Field;
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154 Aft : Field;
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155 Exp : Field;
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156 Scale : Integer)
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157 is
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158 Buf : String (1 .. Field'Last);
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159 Ptr : Natural := 0;
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160
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161 begin
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162 Set_Image_Decimal (Item, Buf, Ptr, Scale, Fore, Aft, Exp);
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163 Put_Item (File, Buf (1 .. Ptr));
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164 end Put_Dec;
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165
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166 -------------
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167 -- Put_LLD --
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168 -------------
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169
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170 procedure Put_LLD
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171 (File : File_Type;
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172 Item : Long_Long_Integer;
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173 Fore : Field;
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174 Aft : Field;
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175 Exp : Field;
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176 Scale : Integer)
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177 is
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178 Buf : String (1 .. Field'Last);
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179 Ptr : Natural := 0;
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180
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181 begin
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182 Set_Image_Long_Long_Decimal (Item, Buf, Ptr, Scale, Fore, Aft, Exp);
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183 Put_Item (File, Buf (1 .. Ptr));
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184 end Put_LLD;
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185
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186 --------------
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187 -- Puts_Dec --
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188 --------------
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189
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190 procedure Puts_Dec
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191 (To : out String;
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192 Item : Integer;
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193 Aft : Field;
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194 Exp : Field;
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195 Scale : Integer)
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196 is
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197 Buf : String (1 .. Field'Last);
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198 Fore : Integer;
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199 Ptr : Natural := 0;
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200
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201 begin
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202 -- Compute Fore, allowing for Aft digits and the decimal dot
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203
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204 Fore := To'Length - Field'Max (1, Aft) - 1;
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205
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206 -- Allow for Exp and two more for E+ or E- if exponent present
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207
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208 if Exp /= 0 then
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209 Fore := Fore - 2 - Exp;
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210 end if;
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211
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212 -- Make sure we have enough room
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213
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214 if Fore < 1 then
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215 raise Layout_Error;
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216 end if;
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217
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218 -- Do the conversion and check length of result
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219
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220 Set_Image_Decimal (Item, Buf, Ptr, Scale, Fore, Aft, Exp);
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221
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222 if Ptr > To'Length then
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223 raise Layout_Error;
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224 else
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225 To := Buf (1 .. Ptr);
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226 end if;
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227 end Puts_Dec;
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228
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229 --------------
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131
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230 -- Puts_LLD --
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111
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231 --------------
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232
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233 procedure Puts_LLD
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234 (To : out String;
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235 Item : Long_Long_Integer;
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236 Aft : Field;
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237 Exp : Field;
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238 Scale : Integer)
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239 is
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240 Buf : String (1 .. Field'Last);
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241 Fore : Integer;
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242 Ptr : Natural := 0;
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243
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244 begin
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245 Fore :=
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246 (if Exp = 0 then To'Length - 1 - Aft else To'Length - 2 - Aft - Exp);
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247
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248 if Fore < 1 then
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249 raise Layout_Error;
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250 end if;
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251
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252 Set_Image_Long_Long_Decimal (Item, Buf, Ptr, Scale, Fore, Aft, Exp);
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253
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254 if Ptr > To'Length then
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255 raise Layout_Error;
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256 else
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257 To := Buf (1 .. Ptr);
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258 end if;
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259 end Puts_LLD;
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260
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261 end Ada.Text_IO.Decimal_Aux;
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