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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 . S T R I N G S . U N B O U N D E D . T E X T _ I O --
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6 -- --
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7 -- B o d y --
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8 -- --
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9 -- Copyright (C) 1997-2017, Free Software Foundation, Inc. --
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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; use Ada.Text_IO;
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33
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34 package body Ada.Strings.Unbounded.Text_IO is
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35
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36 --------------
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37 -- Get_Line --
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38 --------------
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39
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40 function Get_Line return Unbounded_String is
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41 Buffer : String (1 .. 1000);
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42 Last : Natural;
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43 Str1 : String_Access;
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44 Str2 : String_Access;
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45 Result : Unbounded_String;
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46
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47 begin
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48 Get_Line (Buffer, Last);
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49 Str1 := new String'(Buffer (1 .. Last));
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50 while Last = Buffer'Last loop
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51 Get_Line (Buffer, Last);
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52 Str2 := new String (1 .. Str1'Last + Last);
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53 Str2 (Str1'Range) := Str1.all;
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54 Str2 (Str1'Last + 1 .. Str2'Last) := Buffer (1 .. Last);
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55 Free (Str1);
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56 Str1 := Str2;
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57 end loop;
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58
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59 Result.Reference := Str1;
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60 Result.Last := Str1'Length;
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61 return Result;
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62 end Get_Line;
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63
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64 function Get_Line (File : Ada.Text_IO.File_Type) return Unbounded_String is
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65 Buffer : String (1 .. 1000);
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66 Last : Natural;
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67 Str1 : String_Access;
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68 Str2 : String_Access;
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69 Result : Unbounded_String;
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70
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71 begin
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72 Get_Line (File, Buffer, Last);
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73 Str1 := new String'(Buffer (1 .. Last));
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74 while Last = Buffer'Last loop
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75 Get_Line (File, Buffer, Last);
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76 Str2 := new String (1 .. Str1'Last + Last);
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77 Str2 (Str1'Range) := Str1.all;
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78 Str2 (Str1'Last + 1 .. Str2'Last) := Buffer (1 .. Last);
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79 Free (Str1);
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80 Str1 := Str2;
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81 end loop;
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82
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83 Result.Reference := Str1;
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84 Result.Last := Str1'Length;
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85 return Result;
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86 end Get_Line;
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87
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88 procedure Get_Line (Item : out Unbounded_String) is
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89 begin
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90 Get_Line (Current_Input, Item);
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91 end Get_Line;
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92
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93 procedure Get_Line
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94 (File : Ada.Text_IO.File_Type;
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95 Item : out Unbounded_String)
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96 is
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97 begin
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98 -- We are going to read into the string that is already there and
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99 -- allocated. Hopefully it is big enough now, if not, we will extend
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100 -- it in the usual manner using Realloc_For_Chunk.
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101
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102 -- Make sure we start with at least 80 characters
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103
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104 if Item.Reference'Last < 80 then
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105 Realloc_For_Chunk (Item, 80);
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106 end if;
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107
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108 -- Loop to read data, filling current string as far as possible.
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109 -- Item.Last holds the number of characters read so far.
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110
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111 Item.Last := 0;
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112 loop
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113 Get_Line
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114 (File,
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115 Item.Reference (Item.Last + 1 .. Item.Reference'Last),
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116 Item.Last);
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117
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118 -- If we hit the end of the line before the end of the buffer, then
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119 -- we are all done, and the result length is properly set.
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120
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121 if Item.Last < Item.Reference'Last then
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122 return;
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123 end if;
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124
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125 -- If not enough room, double it and keep reading
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126
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127 Realloc_For_Chunk (Item, Item.Last);
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128 end loop;
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129 end Get_Line;
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130
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131 ---------
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132 -- Put --
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133 ---------
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134
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135 procedure Put (U : Unbounded_String) is
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136 begin
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137 Put (U.Reference (1 .. U.Last));
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138 end Put;
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139
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140 procedure Put (File : File_Type; U : Unbounded_String) is
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141 begin
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142 Put (File, U.Reference (1 .. U.Last));
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143 end Put;
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144
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145 --------------
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146 -- Put_Line --
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147 --------------
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148
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149 procedure Put_Line (U : Unbounded_String) is
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150 begin
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151 Put_Line (U.Reference (1 .. U.Last));
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152 end Put_Line;
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153
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154 procedure Put_Line (File : File_Type; U : Unbounded_String) is
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155 begin
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156 Put_Line (File, U.Reference (1 .. U.Last));
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157 end Put_Line;
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158
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159 end Ada.Strings.Unbounded.Text_IO;
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