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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 -- S Y S T E M . S E Q U E N T I A L _ 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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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 System.File_IO;
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33 with Ada.Unchecked_Deallocation;
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34
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35 package body System.Sequential_IO is
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36
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37 subtype AP is FCB.AFCB_Ptr;
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38
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39 package FIO renames System.File_IO;
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40
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41 -------------------
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42 -- AFCB_Allocate --
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43 -------------------
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44
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45 function AFCB_Allocate
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46 (Control_Block : Sequential_AFCB) return FCB.AFCB_Ptr
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47 is
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48 pragma Warnings (Off, Control_Block);
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49
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50 begin
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51 return new Sequential_AFCB;
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52 end AFCB_Allocate;
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53
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54 ----------------
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55 -- AFCB_Close --
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56 ----------------
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57
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58 -- No special processing required for Sequential_IO close
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59
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60 procedure AFCB_Close (File : not null access Sequential_AFCB) is
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61 pragma Warnings (Off, File);
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62
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63 begin
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64 null;
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65 end AFCB_Close;
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66
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67 ---------------
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68 -- AFCB_Free --
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69 ---------------
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70
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71 procedure AFCB_Free (File : not null access Sequential_AFCB) is
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72
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73 type FCB_Ptr is access all Sequential_AFCB;
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74
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75 FT : FCB_Ptr := FCB_Ptr (File);
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76
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77 procedure Free is new
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78 Ada.Unchecked_Deallocation (Sequential_AFCB, FCB_Ptr);
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79
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80 begin
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81 Free (FT);
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82 end AFCB_Free;
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83
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84 ------------
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85 -- Create --
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86 ------------
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87
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88 procedure Create
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89 (File : in out File_Type;
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90 Mode : FCB.File_Mode := FCB.Out_File;
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91 Name : String := "";
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92 Form : String := "")
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93 is
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94 Dummy_File_Control_Block : Sequential_AFCB;
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95 pragma Warnings (Off, Dummy_File_Control_Block);
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96 -- Yes, we know this is never assigned a value, only the tag
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97 -- is used for dispatching purposes, so that's expected.
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98
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99 begin
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100 FIO.Open (File_Ptr => AP (File),
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101 Dummy_FCB => Dummy_File_Control_Block,
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102 Mode => Mode,
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103 Name => Name,
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104 Form => Form,
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105 Amethod => 'Q',
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106 Creat => True,
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107 Text => False);
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108 end Create;
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109
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110 ----------
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111 -- Open --
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112 ----------
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113
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114 procedure Open
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115 (File : in out File_Type;
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116 Mode : FCB.File_Mode;
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117 Name : String;
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118 Form : String := "")
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119 is
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120 Dummy_File_Control_Block : Sequential_AFCB;
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121 pragma Warnings (Off, Dummy_File_Control_Block);
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122 -- Yes, we know this is never assigned a value, only the tag
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123 -- is used for dispatching purposes, so that's expected.
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124
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125 begin
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126 FIO.Open (File_Ptr => AP (File),
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127 Dummy_FCB => Dummy_File_Control_Block,
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128 Mode => Mode,
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129 Name => Name,
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130 Form => Form,
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131 Amethod => 'Q',
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132 Creat => False,
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133 Text => False);
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134 end Open;
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135
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136 ----------
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137 -- Read --
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138 ----------
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139
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140 -- Not used, since Sequential_IO files are not used as streams
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141
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142 procedure Read
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143 (File : in out Sequential_AFCB;
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144 Item : out Ada.Streams.Stream_Element_Array;
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145 Last : out Ada.Streams.Stream_Element_Offset)
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146 is
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147 begin
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148 raise Program_Error;
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149 end Read;
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150
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151 -----------
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152 -- Write --
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153 -----------
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154
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155 -- Not used, since Sequential_IO files are not used as streams
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156
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157 procedure Write
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158 (File : in out Sequential_AFCB;
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159 Item : Ada.Streams.Stream_Element_Array)
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160 is
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161 begin
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162 raise Program_Error;
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163 end Write;
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164
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165 end System.Sequential_IO;
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