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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 . D I R E C 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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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.IO_Exceptions; use Ada.IO_Exceptions;
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33 with Ada.Unchecked_Deallocation;
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34 with Interfaces.C_Streams; use Interfaces.C_Streams;
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35 with System; use System;
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36 with System.CRTL;
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37 with System.File_IO;
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38 with System.Soft_Links;
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39
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40 package body System.Direct_IO is
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41
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42 package FIO renames System.File_IO;
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43 package SSL renames System.Soft_Links;
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44
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45 subtype AP is FCB.AFCB_Ptr;
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46 use type FCB.Shared_Status_Type;
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47
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48 use type System.CRTL.int64;
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49 use type System.CRTL.size_t;
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50
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51 -----------------------
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52 -- Local Subprograms --
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53 -----------------------
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54
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55 procedure Set_Position (File : File_Type);
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56 -- Sets file position pointer according to value of current index
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57
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58 -------------------
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59 -- AFCB_Allocate --
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60 -------------------
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61
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62 function AFCB_Allocate (Control_Block : Direct_AFCB) return FCB.AFCB_Ptr is
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63 pragma Unreferenced (Control_Block);
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64 begin
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65 return new Direct_AFCB;
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66 end AFCB_Allocate;
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67
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68 ----------------
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69 -- AFCB_Close --
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70 ----------------
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71
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72 -- No special processing required for Direct_IO close
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73
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74 procedure AFCB_Close (File : not null access Direct_AFCB) is
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75 pragma Unreferenced (File);
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76 begin
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77 null;
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78 end AFCB_Close;
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79
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80 ---------------
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81 -- AFCB_Free --
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82 ---------------
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83
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84 procedure AFCB_Free (File : not null access Direct_AFCB) is
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85
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86 type FCB_Ptr is access all Direct_AFCB;
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87
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88 FT : FCB_Ptr := FCB_Ptr (File);
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89
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90 procedure Free is new
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91 Ada.Unchecked_Deallocation (Direct_AFCB, FCB_Ptr);
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92
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93 begin
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94 Free (FT);
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95 end AFCB_Free;
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96
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97 ------------
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98 -- Create --
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99 ------------
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100
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101 procedure Create
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102 (File : in out File_Type;
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103 Mode : FCB.File_Mode := FCB.Inout_File;
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104 Name : String := "";
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105 Form : String := "")
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106 is
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107 Dummy_File_Control_Block : Direct_AFCB;
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108 pragma Warnings (Off, Dummy_File_Control_Block);
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109 -- Yes, we know this is never assigned a value, only the tag is used for
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110 -- dispatching purposes, so that's expected.
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111
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112 begin
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113 FIO.Open (File_Ptr => AP (File),
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114 Dummy_FCB => Dummy_File_Control_Block,
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115 Mode => Mode,
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116 Name => Name,
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117 Form => Form,
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118 Amethod => 'D',
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119 Creat => True,
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120 Text => False);
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121 end Create;
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122
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123 -----------------
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124 -- End_Of_File --
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125 -----------------
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126
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127 function End_Of_File (File : File_Type) return Boolean is
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128 begin
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129 FIO.Check_Read_Status (AP (File));
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130 return File.Index > Size (File);
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131 end End_Of_File;
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132
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133 -----------
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134 -- Index --
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135 -----------
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136
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137 function Index (File : File_Type) return Positive_Count is
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138 begin
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139 FIO.Check_File_Open (AP (File));
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140 return File.Index;
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141 end Index;
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142
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143 ----------
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144 -- Open --
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145 ----------
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146
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147 procedure Open
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148 (File : in out File_Type;
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149 Mode : FCB.File_Mode;
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150 Name : String;
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151 Form : String := "")
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152 is
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153 Dummy_File_Control_Block : Direct_AFCB;
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154 pragma Warnings (Off, Dummy_File_Control_Block);
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155 -- Yes, we know this is never assigned a value, only the tag is used for
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156 -- dispatching purposes, so that's expected.
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157
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158 begin
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159 FIO.Open (File_Ptr => AP (File),
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160 Dummy_FCB => Dummy_File_Control_Block,
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161 Mode => Mode,
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162 Name => Name,
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163 Form => Form,
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164 Amethod => 'D',
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165 Creat => False,
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166 Text => False);
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167 end Open;
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168
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169 ----------
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170 -- Read --
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171 ----------
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172
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173 procedure Read
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174 (File : File_Type;
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175 Item : Address;
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176 Size : Interfaces.C_Streams.size_t;
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177 From : Positive_Count)
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178 is
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179 begin
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180 Set_Index (File, From);
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181 Read (File, Item, Size);
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182 end Read;
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183
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184 procedure Read
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185 (File : File_Type;
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186 Item : Address;
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187 Size : Interfaces.C_Streams.size_t)
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188 is
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189 begin
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190 FIO.Check_Read_Status (AP (File));
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191
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192 -- If last operation was not a read, or if in file sharing mode,
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193 -- then reset the physical pointer of the file to match the index
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194 -- We lock out task access over the two operations in this case.
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195
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196 if File.Last_Op /= Op_Read
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197 or else File.Shared_Status = FCB.Yes
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198 then
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199 if End_Of_File (File) then
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200 raise End_Error;
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201 end if;
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202
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203 Locked_Processing : begin
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204 SSL.Lock_Task.all;
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205 Set_Position (File);
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206 FIO.Read_Buf (AP (File), Item, Size);
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207 SSL.Unlock_Task.all;
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208
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209 exception
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210 when others =>
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211 SSL.Unlock_Task.all;
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212 raise;
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213 end Locked_Processing;
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214
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215 else
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216 FIO.Read_Buf (AP (File), Item, Size);
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217 end if;
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218
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219 File.Index := File.Index + 1;
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220
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221 -- Set last operation to read, unless we did not read a full record
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222 -- (happens with the variant record case) in which case we set the
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223 -- last operation as other, to force the file position to be reset
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224 -- on the next read.
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225
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226 File.Last_Op := (if File.Bytes = Size then Op_Read else Op_Other);
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227 end Read;
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228
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229 -- The following is the required overriding for Stream.Read, which is
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230 -- not used, since we do not do Stream operations on Direct_IO files.
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231
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232 procedure Read
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233 (File : in out Direct_AFCB;
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234 Item : out Ada.Streams.Stream_Element_Array;
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235 Last : out Ada.Streams.Stream_Element_Offset)
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236 is
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237 begin
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238 raise Program_Error;
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239 end Read;
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240
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241 -----------
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242 -- Reset --
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243 -----------
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244
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245 procedure Reset (File : in out File_Type; Mode : FCB.File_Mode) is
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246 pragma Warnings (Off, File);
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247 -- File is actually modified via Unrestricted_Access below, but
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248 -- GNAT will generate a warning anyway.
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249 --
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250 -- Note that we do not use pragma Unmodified here, since in -gnatc mode,
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251 -- GNAT will complain that File is modified for "File.Index := 1;"
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252 begin
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253 FIO.Reset (AP (File)'Unrestricted_Access, Mode);
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254 File.Index := 1;
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255 File.Last_Op := Op_Read;
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256 end Reset;
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257
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258 procedure Reset (File : in out File_Type) is
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259 pragma Warnings (Off, File);
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260 -- See above (other Reset procedure) for explanations on this pragma
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261 begin
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262 FIO.Reset (AP (File)'Unrestricted_Access);
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263 File.Index := 1;
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264 File.Last_Op := Op_Read;
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265 end Reset;
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266
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267 ---------------
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268 -- Set_Index --
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269 ---------------
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270
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271 procedure Set_Index (File : File_Type; To : Positive_Count) is
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272 begin
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273 FIO.Check_File_Open (AP (File));
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274 File.Index := Count (To);
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275 File.Last_Op := Op_Other;
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276 end Set_Index;
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277
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278 ------------------
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279 -- Set_Position --
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280 ------------------
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281
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282 procedure Set_Position (File : File_Type) is
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283 R : int;
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284 begin
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285 R :=
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286 fseek64
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287 (File.Stream, int64 (File.Bytes) * int64 (File.Index - 1), SEEK_SET);
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288
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289 if R /= 0 then
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290 raise Use_Error;
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291 end if;
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292 end Set_Position;
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293
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294 ----------
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295 -- Size --
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296 ----------
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297
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298 function Size (File : File_Type) return Count is
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299 Pos : int64;
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300
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301 begin
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302 FIO.Check_File_Open (AP (File));
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303 File.Last_Op := Op_Other;
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304
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305 if fseek64 (File.Stream, 0, SEEK_END) /= 0 then
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306 raise Device_Error;
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307 end if;
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308
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309 Pos := ftell64 (File.Stream);
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310
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311 if Pos = -1 then
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312 raise Use_Error;
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313 end if;
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314
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315 return Count (Pos / int64 (File.Bytes));
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316 end Size;
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317
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318 -----------
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319 -- Write --
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320 -----------
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321
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322 procedure Write
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323 (File : File_Type;
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324 Item : Address;
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325 Size : Interfaces.C_Streams.size_t;
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326 Zeroes : System.Storage_Elements.Storage_Array)
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327
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328 is
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329 procedure Do_Write;
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330 -- Do the actual write
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331
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332 --------------
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333 -- Do_Write --
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334 --------------
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335
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336 procedure Do_Write is
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337 begin
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338 FIO.Write_Buf (AP (File), Item, Size);
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339
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340 -- If we did not write the whole record (happens with the variant
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341 -- record case), then fill out the rest of the record with zeroes.
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342 -- This is cleaner in any case, and is required for the last
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343 -- record, since otherwise the length of the file is wrong.
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344
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345 if File.Bytes > Size then
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346 FIO.Write_Buf (AP (File), Zeroes'Address, File.Bytes - Size);
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347 end if;
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348 end Do_Write;
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349
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350 -- Start of processing for Write
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351
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352 begin
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353 FIO.Check_Write_Status (AP (File));
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354
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355 -- If last operation was not a write, or if in file sharing mode,
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356 -- then reset the physical pointer of the file to match the index
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357 -- We lock out task access over the two operations in this case.
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358
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359 if File.Last_Op /= Op_Write
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360 or else File.Shared_Status = FCB.Yes
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361 then
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362 Locked_Processing : begin
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363 SSL.Lock_Task.all;
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364 Set_Position (File);
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365 Do_Write;
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366 SSL.Unlock_Task.all;
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367
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368 exception
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369 when others =>
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370 SSL.Unlock_Task.all;
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371 raise;
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372 end Locked_Processing;
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373
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374 else
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375 Do_Write;
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376 end if;
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377
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378 File.Index := File.Index + 1;
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379
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380 -- Set last operation to write, unless we did not read a full record
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381 -- (happens with the variant record case) in which case we set the
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382 -- last operation as other, to force the file position to be reset
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383 -- on the next write.
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384
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385 File.Last_Op := (if File.Bytes = Size then Op_Write else Op_Other);
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386 end Write;
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387
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388 -- The following is the required overriding for Stream.Write, which is
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389 -- not used, since we do not do Stream operations on Direct_IO files.
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390
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391 procedure Write
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392 (File : in out Direct_AFCB;
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393 Item : Ada.Streams.Stream_Element_Array)
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394 is
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395 begin
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396 raise Program_Error;
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397 end Write;
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398
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399 end System.Direct_IO;
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