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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 . R E S P O N S E _ F I L E --
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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) 2007-2018, 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 pragma Compiler_Unit_Warning;
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33
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34 with Ada.Unchecked_Deallocation;
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35
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36 with System.OS_Lib; use System.OS_Lib;
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37
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38 package body System.Response_File is
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39
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40 type File_Rec;
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41 type File_Ptr is access File_Rec;
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42 type File_Rec is record
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43 Name : String_Access;
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44 Next : File_Ptr;
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45 Prev : File_Ptr;
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46 end record;
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47 -- To build a stack of response file names
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48
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49 procedure Free is new Ada.Unchecked_Deallocation (File_Rec, File_Ptr);
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50
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51 type Argument_List_Access is access Argument_List;
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52 procedure Free is new Ada.Unchecked_Deallocation
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53 (Argument_List, Argument_List_Access);
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54 -- Free only the allocated Argument_List, not allocated String components
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55
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56 --------------------
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57 -- Arguments_From --
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58 --------------------
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59
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60 function Arguments_From
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61 (Response_File_Name : String;
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62 Recursive : Boolean := False;
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63 Ignore_Non_Existing_Files : Boolean := False)
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64 return Argument_List
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65 is
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66 First_File : File_Ptr := null;
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67 Last_File : File_Ptr := null;
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68 -- The stack of response files
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69
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70 Arguments : Argument_List_Access := new Argument_List (1 .. 4);
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71 Last_Arg : Natural := 0;
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72
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73 procedure Add_Argument (Arg : String);
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74 -- Add argument Arg to argument list Arguments, increasing Arguments
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75 -- if necessary.
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76
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77 procedure Recurse (File_Name : String);
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78 -- Get the arguments from the file and call itself recursively if one of
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79 -- the arguments starts with character '@'.
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80
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81 ------------------
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82 -- Add_Argument --
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83 ------------------
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84
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85 procedure Add_Argument (Arg : String) is
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86 begin
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87 if Last_Arg = Arguments'Last then
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88 declare
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89 New_Arguments : constant Argument_List_Access :=
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90 new Argument_List (1 .. Arguments'Last * 2);
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91 begin
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92 New_Arguments (Arguments'Range) := Arguments.all;
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93 Arguments.all := (others => null);
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94 Free (Arguments);
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95 Arguments := New_Arguments;
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96 end;
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97 end if;
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98
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99 Last_Arg := Last_Arg + 1;
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100 Arguments (Last_Arg) := new String'(Arg);
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101 end Add_Argument;
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102
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103 -------------
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104 -- Recurse --
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105 -------------
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106
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107 procedure Recurse (File_Name : String) is
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108 -- Open the response file. If not found, fail or report a warning,
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109 -- depending on the value of Ignore_Non_Existing_Files.
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110
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111 FD : constant File_Descriptor := Open_Read (File_Name, Text);
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112
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113 Buffer_Size : constant := 1500;
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114 Buffer : String (1 .. Buffer_Size);
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115
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116 Buffer_Length : Natural;
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117
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118 Buffer_Cursor : Natural;
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119
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120 End_Of_File_Reached : Boolean;
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121
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122 Line : String (1 .. Max_Line_Length + 1);
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123 Last : Natural;
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124
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125 First_Char : Positive;
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126 -- Index of the first character of an argument in Line
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127
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128 Last_Char : Natural;
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129 -- Index of the last character of an argument in Line
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130
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131 In_String : Boolean;
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132 -- True when inside a quoted string
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133
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134 Arg : Positive;
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135
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136 function End_Of_File return Boolean;
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137 -- True when the end of the response file has been reached
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138
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139 procedure Get_Buffer;
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140 -- Read one buffer from the response file
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141
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142 procedure Get_Line;
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143 -- Get one line from the response file
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144
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145 -----------------
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146 -- End_Of_File --
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147 -----------------
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148
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149 function End_Of_File return Boolean is
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150 begin
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151 return End_Of_File_Reached and then Buffer_Cursor > Buffer_Length;
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152 end End_Of_File;
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153
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154 ----------------
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155 -- Get_Buffer --
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156 ----------------
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157
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158 procedure Get_Buffer is
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159 begin
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160 Buffer_Length := Read (FD, Buffer (1)'Address, Buffer'Length);
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161 End_Of_File_Reached := Buffer_Length < Buffer'Length;
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162 Buffer_Cursor := 1;
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163 end Get_Buffer;
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164
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165 --------------
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166 -- Get_Line --
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167 --------------
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168
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169 procedure Get_Line is
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170 Ch : Character;
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171
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172 begin
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173 Last := 0;
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174
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175 if End_Of_File then
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176 return;
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177 end if;
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178
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179 loop
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180 Ch := Buffer (Buffer_Cursor);
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181
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182 exit when Ch = ASCII.CR or else
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183 Ch = ASCII.LF or else
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184 Ch = ASCII.FF;
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185
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186 Last := Last + 1;
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187 Line (Last) := Ch;
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188
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189 if Last = Line'Last then
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190 return;
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191 end if;
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192
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193 Buffer_Cursor := Buffer_Cursor + 1;
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194
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195 if Buffer_Cursor > Buffer_Length then
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196 Get_Buffer;
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197
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198 if End_Of_File then
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199 return;
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200 end if;
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201 end if;
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202 end loop;
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203
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204 loop
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205 Ch := Buffer (Buffer_Cursor);
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206
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207 exit when Ch /= ASCII.HT and then
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208 Ch /= ASCII.LF and then
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209 Ch /= ASCII.FF;
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210
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211 Buffer_Cursor := Buffer_Cursor + 1;
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212
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213 if Buffer_Cursor > Buffer_Length then
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214 Get_Buffer;
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215
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216 if End_Of_File then
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217 return;
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218 end if;
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219 end if;
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220 end loop;
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221 end Get_Line;
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222
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223 -- Start of processing for Recurse
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224
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225 begin
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226 Last_Arg := 0;
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227
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228 if FD = Invalid_FD then
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229 if Ignore_Non_Existing_Files then
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230 return;
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231 else
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232 raise File_Does_Not_Exist;
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233 end if;
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234 end if;
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235
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236 -- Put the response file name on the stack
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237
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238 if First_File = null then
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239 First_File :=
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240 new File_Rec'
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241 (Name => new String'(File_Name),
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242 Next => null,
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243 Prev => null);
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244 Last_File := First_File;
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245
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246 else
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247 declare
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248 Current : File_Ptr := First_File;
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249
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250 begin
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251 loop
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252 if Current.Name.all = File_Name then
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253 raise Circularity_Detected;
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254 end if;
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255
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256 Current := Current.Next;
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257 exit when Current = null;
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258 end loop;
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259
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260 Last_File.Next :=
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261 new File_Rec'
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262 (Name => new String'(File_Name),
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263 Next => null,
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264 Prev => Last_File);
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265 Last_File := Last_File.Next;
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266 end;
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267 end if;
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268
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269 End_Of_File_Reached := False;
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270 Get_Buffer;
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271
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272 -- Read the response file line by line
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273
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274 Line_Loop :
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275 while not End_Of_File loop
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276 Get_Line;
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277
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278 if Last = Line'Last then
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279 raise Line_Too_Long;
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280 end if;
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281
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282 First_Char := 1;
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283
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284 -- Get each argument on the line
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285
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286 Arg_Loop :
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287 loop
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288 -- First, skip any white space
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289
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290 while First_Char <= Last loop
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291 exit when Line (First_Char) /= ' ' and then
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292 Line (First_Char) /= ASCII.HT;
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293 First_Char := First_Char + 1;
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294 end loop;
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295
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296 exit Arg_Loop when First_Char > Last;
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297
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298 Last_Char := First_Char;
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299 In_String := False;
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300
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301 -- Get the character one by one
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302
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303 Character_Loop :
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304 while Last_Char <= Last loop
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305
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306 -- Inside a string, check only for '"'
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307
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308 if In_String then
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309 if Line (Last_Char) = '"' then
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310
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311 -- Remove the '"'
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312
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313 Line (Last_Char .. Last - 1) :=
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314 Line (Last_Char + 1 .. Last);
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315 Last := Last - 1;
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316
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317 -- End of string is end of argument
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318
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319 if Last_Char > Last or else
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320 Line (Last_Char) = ' ' or else
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321 Line (Last_Char) = ASCII.HT
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322 then
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323 In_String := False;
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324
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325 Last_Char := Last_Char - 1;
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326 exit Character_Loop;
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327
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328 else
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329 -- If there are two consecutive '"', the quoted
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330 -- string is not closed
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331
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332 In_String := Line (Last_Char) = '"';
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333
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334 if In_String then
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335 Last_Char := Last_Char + 1;
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336 end if;
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337 end if;
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338
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339 else
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340 Last_Char := Last_Char + 1;
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341 end if;
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342
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343 elsif Last_Char = Last then
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344
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345 -- An opening '"' at the end of the line is an error
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346
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347 if Line (Last) = '"' then
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348 raise No_Closing_Quote;
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349
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350 else
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351 -- The argument ends with the line
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352
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353 exit Character_Loop;
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354 end if;
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355
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356 elsif Line (Last_Char) = '"' then
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357
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358 -- Entering a quoted string: remove the '"'
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359
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360 In_String := True;
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361 Line (Last_Char .. Last - 1) :=
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362 Line (Last_Char + 1 .. Last);
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363 Last := Last - 1;
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364
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365 else
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366 -- Outside quoted strings, white space ends the argument
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367
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368 exit Character_Loop
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369 when Line (Last_Char + 1) = ' ' or else
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370 Line (Last_Char + 1) = ASCII.HT;
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371
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372 Last_Char := Last_Char + 1;
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373 end if;
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374 end loop Character_Loop;
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375
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376 -- It is an error to not close a quoted string before the end
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377 -- of the line.
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378
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379 if In_String then
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380 raise No_Closing_Quote;
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381 end if;
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382
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383 -- Add the argument to the list
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384
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385 declare
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386 Arg : String (1 .. Last_Char - First_Char + 1);
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387 begin
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388 Arg := Line (First_Char .. Last_Char);
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389 Add_Argument (Arg);
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390 end;
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391
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392 -- Next argument, if line is not finished
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393
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394 First_Char := Last_Char + 1;
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395 end loop Arg_Loop;
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396 end loop Line_Loop;
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397
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398 Close (FD);
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399
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400 -- If Recursive is True, check for any argument starting with '@'
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401
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402 if Recursive then
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403 Arg := 1;
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404 while Arg <= Last_Arg loop
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405
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406 if Arguments (Arg)'Length > 0 and then
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407 Arguments (Arg) (1) = '@'
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408 then
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409 -- Ignore argument '@' with no file name
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410
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411 if Arguments (Arg)'Length = 1 then
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412 Arguments (Arg .. Last_Arg - 1) :=
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413 Arguments (Arg + 1 .. Last_Arg);
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414 Last_Arg := Last_Arg - 1;
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415
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416 else
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417 -- Save the current arguments and get those in the new
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418 -- response file.
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419
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420 declare
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421 Inc_File_Name : constant String :=
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422 Arguments (Arg) (2 .. Arguments (Arg)'Last);
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423 Current_Arguments : constant Argument_List :=
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424 Arguments (1 .. Last_Arg);
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425 begin
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426 Recurse (Inc_File_Name);
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427
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428 -- Insert the new arguments where the new response
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429 -- file was imported.
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430
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431 declare
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432 New_Arguments : constant Argument_List :=
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433 Arguments (1 .. Last_Arg);
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434 New_Last_Arg : constant Positive :=
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435 Current_Arguments'Length +
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436 New_Arguments'Length - 1;
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437
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438 begin
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439 -- Grow Arguments if it is not large enough
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440
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441 if Arguments'Last < New_Last_Arg then
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442 Last_Arg := Arguments'Last;
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443 Free (Arguments);
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444
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445 while Last_Arg < New_Last_Arg loop
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446 Last_Arg := Last_Arg * 2;
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447 end loop;
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448
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449 Arguments := new Argument_List (1 .. Last_Arg);
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450 end if;
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451
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452 Last_Arg := New_Last_Arg;
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453
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454 Arguments (1 .. Last_Arg) :=
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455 Current_Arguments (1 .. Arg - 1) &
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456 New_Arguments &
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457 Current_Arguments
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458 (Arg + 1 .. Current_Arguments'Last);
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459
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460 Arg := Arg + New_Arguments'Length;
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461 end;
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462 end;
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463 end if;
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464
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465 else
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466 Arg := Arg + 1;
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467 end if;
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468 end loop;
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469 end if;
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470
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471 -- Remove the response file name from the stack
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472
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473 if First_File = Last_File then
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474 System.Strings.Free (First_File.Name);
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|
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475 Free (First_File);
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|
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476 First_File := null;
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|
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477 Last_File := null;
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|
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478
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479 else
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|
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480 System.Strings.Free (Last_File.Name);
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|
|
481 Last_File := Last_File.Prev;
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|
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482 Free (Last_File.Next);
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483 end if;
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|
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484
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|
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485 exception
|
|
|
486 when others =>
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|
|
487 Close (FD);
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|
|
488
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|
|
489 raise;
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|
|
490 end Recurse;
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|
|
491
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|
|
492 -- Start of processing for Arguments_From
|
|
|
493
|
|
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494 begin
|
|
|
495 -- The job is done by procedure Recurse
|
|
|
496
|
|
|
497 Recurse (Response_File_Name);
|
|
|
498
|
|
|
499 -- Free Arguments before returning the result
|
|
|
500
|
|
|
501 declare
|
|
|
502 Result : constant Argument_List := Arguments (1 .. Last_Arg);
|
|
|
503 begin
|
|
|
504 Free (Arguments);
|
|
|
505 return Result;
|
|
|
506 end;
|
|
|
507
|
|
|
508 exception
|
|
|
509 when others =>
|
|
|
510
|
|
|
511 -- When an exception occurs, deallocate everything
|
|
|
512
|
|
|
513 Free (Arguments);
|
|
|
514
|
|
|
515 while First_File /= null loop
|
|
|
516 Last_File := First_File.Next;
|
|
|
517 System.Strings.Free (First_File.Name);
|
|
|
518 Free (First_File);
|
|
|
519 First_File := Last_File;
|
|
|
520 end loop;
|
|
|
521
|
|
|
522 raise;
|
|
|
523 end Arguments_From;
|
|
|
524
|
|
|
525 end System.Response_File;
|
