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1 ------------------------------------------------------------------------------
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2 -- --
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3 -- GNAT RUN-TIME COMPONENTS --
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4 -- --
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5 -- A D A . T E X T _ I O --
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6 -- --
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7 -- B o d y --
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8 -- --
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145
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9 -- Copyright (C) 1992-2019, 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.Streams; use Ada.Streams;
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33 with Interfaces.C_Streams; use Interfaces.C_Streams;
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34
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35 with System.File_IO;
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36 with System.CRTL;
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37 with System.WCh_Cnv; use System.WCh_Cnv;
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38 with System.WCh_Con; use System.WCh_Con;
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39
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40 with Ada.Unchecked_Conversion;
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41 with Ada.Unchecked_Deallocation;
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42
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43 pragma Elaborate_All (System.File_IO);
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44 -- Needed because of calls to Chain_File in package body elaboration
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45
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145
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46 package body Ada.Text_IO with
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47 Refined_State => (File_System => (Standard_In,
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48 Standard_Out,
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49 Standard_Err,
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50 Current_In,
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51 Current_Out,
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52 Current_Err,
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53 In_Name,
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54 Out_Name,
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55 Err_Name,
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56 WC_Encoding))
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57 is
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111
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58
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59 package FIO renames System.File_IO;
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60
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61 subtype AP is FCB.AFCB_Ptr;
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62
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63 function To_FCB is new Ada.Unchecked_Conversion (File_Mode, FCB.File_Mode);
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64 function To_TIO is new Ada.Unchecked_Conversion (FCB.File_Mode, File_Mode);
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65 use type FCB.File_Mode;
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66
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67 use type System.CRTL.size_t;
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68
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69 WC_Encoding : Character;
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70 pragma Import (C, WC_Encoding, "__gl_wc_encoding");
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71 -- Default wide character encoding
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72
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73 Err_Name : aliased String := "*stderr" & ASCII.NUL;
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74 In_Name : aliased String := "*stdin" & ASCII.NUL;
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75 Out_Name : aliased String := "*stdout" & ASCII.NUL;
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76 -- Names of standard files
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77 --
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78 -- Use "preallocated" strings to avoid calling "new" during the elaboration
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79 -- of the run time. This is needed in the tasking case to avoid calling
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80 -- Task_Lock too early. A filename is expected to end with a null character
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81 -- in the runtime, here the null characters are added just to have a
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82 -- correct filename length.
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83 --
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84 -- Note: the names for these files are bogus, and probably it would be
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85 -- better for these files to have no names, but the ACVC tests insist.
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86 -- We use names that are bound to fail in open etc.
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87
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88 Null_Str : aliased constant String := "";
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89 -- Used as form string for standard files
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90
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91 -----------------------
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92 -- Local Subprograms --
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93 -----------------------
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94
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95 function Get_Upper_Half_Char
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96 (C : Character;
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97 File : File_Type) return Character;
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98 -- This function is shared by Get and Get_Immediate to extract an encoded
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99 -- upper half character value from the given File. The first byte has
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100 -- already been read and is passed in C. The character value is returned as
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101 -- the result, and the file pointer is bumped past the character.
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102 -- Constraint_Error is raised if the encoded value is outside the bounds of
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103 -- type Character.
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104
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105 function Get_Upper_Half_Char_Immed
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106 (C : Character;
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107 File : File_Type) return Character;
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108 -- This routine is identical to Get_Upper_Half_Char, except that the reads
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109 -- are done in Get_Immediate mode (i.e. without waiting for a line return).
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110
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111 function Getc (File : File_Type) return int;
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112 -- Gets next character from file, which has already been checked for being
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113 -- in read status, and returns the character read if no error occurs. The
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114 -- result is EOF if the end of file was read.
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115
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116 function Getc_Immed (File : File_Type) return int;
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117 -- This routine is identical to Getc, except that the read is done in
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118 -- Get_Immediate mode (i.e. without waiting for a line return).
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119
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120 function Has_Upper_Half_Character (Item : String) return Boolean;
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121 -- Returns True if any of the characters is in the range 16#80#-16#FF#
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122
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123 function Nextc (File : File_Type) return int;
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124 -- Returns next character from file without skipping past it (i.e. it is a
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125 -- combination of Getc followed by an Ungetc).
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126
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127 procedure Put_Encoded (File : File_Type; Char : Character);
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128 -- Called to output a character Char to the given File, when the encoding
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129 -- method for the file is other than brackets, and Char is upper half.
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130
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131 procedure Putc (ch : int; File : File_Type);
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132 -- Outputs the given character to the file, which has already been checked
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133 -- for being in output status. Device_Error is raised if the character
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134 -- cannot be written.
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135
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136 procedure Set_WCEM (File : in out File_Type);
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137 -- Called by Open and Create to set the wide character encoding method for
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138 -- the file, processing a WCEM form parameter if one is present. File is
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139 -- IN OUT because it may be closed in case of an error.
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140
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141 procedure Terminate_Line (File : File_Type);
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142 -- If the file is in Write_File or Append_File mode, and the current line
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143 -- is not terminated, then a line terminator is written using New_Line.
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144 -- Note that there is no Terminate_Page routine, because the page mark at
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145 -- the end of the file is implied if necessary.
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146
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147 procedure Ungetc (ch : int; File : File_Type);
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148 -- Pushes back character into stream, using ungetc. The caller has checked
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149 -- that the file is in read status. Device_Error is raised if the character
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150 -- cannot be pushed back. An attempt to push back and end of file character
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151 -- (EOF) is ignored.
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152
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153 -------------------
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154 -- AFCB_Allocate --
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155 -------------------
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156
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157 function AFCB_Allocate (Control_Block : Text_AFCB) return FCB.AFCB_Ptr is
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158 pragma Unreferenced (Control_Block);
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159 begin
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160 return new Text_AFCB;
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161 end AFCB_Allocate;
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162
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163 ----------------
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164 -- AFCB_Close --
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165 ----------------
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166
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167 procedure AFCB_Close (File : not null access Text_AFCB) is
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168 begin
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169 -- If the file being closed is one of the current files, then close
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170 -- the corresponding current file. It is not clear that this action
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171 -- is required (RM A.10.3(23)) but it seems reasonable, and besides
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172 -- ACVC test CE3208A expects this behavior.
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173
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174 if File_Type (File) = Current_In then
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175 Current_In := null;
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176 elsif File_Type (File) = Current_Out then
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177 Current_Out := null;
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178 elsif File_Type (File) = Current_Err then
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179 Current_Err := null;
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180 end if;
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181
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182 Terminate_Line (File_Type (File));
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183 end AFCB_Close;
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184
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185 ---------------
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186 -- AFCB_Free --
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187 ---------------
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188
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189 procedure AFCB_Free (File : not null access Text_AFCB) is
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190 type FCB_Ptr is access all Text_AFCB;
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191 FT : FCB_Ptr := FCB_Ptr (File);
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192
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193 procedure Free is new Ada.Unchecked_Deallocation (Text_AFCB, FCB_Ptr);
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194
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195 begin
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196 Free (FT);
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197 end AFCB_Free;
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198
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199 -----------
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200 -- Close --
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201 -----------
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202
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203 procedure Close (File : in out File_Type) is
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204 begin
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205 FIO.Close (AP (File)'Unrestricted_Access);
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206 end Close;
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207
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208 ---------
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209 -- Col --
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210 ---------
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211
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212 -- Note: we assume that it is impossible in practice for the column
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213 -- to exceed the value of Count'Last, i.e. no check is required for
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214 -- overflow raising layout error.
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215
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216 function Col (File : File_Type) return Positive_Count is
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217 begin
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218 FIO.Check_File_Open (AP (File));
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219 return File.Col;
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220 end Col;
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221
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222 function Col return Positive_Count is
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223 begin
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224 return Col (Current_Out);
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225 end Col;
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226
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227 ------------
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228 -- Create --
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229 ------------
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230
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231 procedure Create
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232 (File : in out File_Type;
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233 Mode : File_Mode := Out_File;
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234 Name : String := "";
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235 Form : String := "")
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236 is
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237 Dummy_File_Control_Block : Text_AFCB;
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238 pragma Warnings (Off, Dummy_File_Control_Block);
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239 -- Yes, we know this is never assigned a value, only the tag
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240 -- is used for dispatching purposes, so that's expected.
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241
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242 begin
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243 FIO.Open (File_Ptr => AP (File),
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244 Dummy_FCB => Dummy_File_Control_Block,
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245 Mode => To_FCB (Mode),
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246 Name => Name,
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247 Form => Form,
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248 Amethod => 'T',
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249 Creat => True,
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250 Text => True);
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251
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252 File.Self := File;
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253 Set_WCEM (File);
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254 end Create;
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255
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256 -------------------
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257 -- Current_Error --
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258 -------------------
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259
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260 function Current_Error return File_Type is
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261 begin
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262 return Current_Err;
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263 end Current_Error;
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264
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265 function Current_Error return File_Access is
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266 begin
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267 return Current_Err.Self'Access;
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268 end Current_Error;
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269
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270 -------------------
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271 -- Current_Input --
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272 -------------------
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273
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274 function Current_Input return File_Type is
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275 begin
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276 return Current_In;
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277 end Current_Input;
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278
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279 function Current_Input return File_Access is
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280 begin
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281 return Current_In.Self'Access;
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282 end Current_Input;
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283
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284 --------------------
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285 -- Current_Output --
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286 --------------------
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287
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288 function Current_Output return File_Type is
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289 begin
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290 return Current_Out;
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291 end Current_Output;
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292
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293 function Current_Output return File_Access is
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294 begin
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295 return Current_Out.Self'Access;
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296 end Current_Output;
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297
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298 ------------
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299 -- Delete --
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300 ------------
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301
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302 procedure Delete (File : in out File_Type) is
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303 begin
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304 FIO.Delete (AP (File)'Unrestricted_Access);
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305 end Delete;
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306
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307 -----------------
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308 -- End_Of_File --
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309 -----------------
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310
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311 function End_Of_File (File : File_Type) return Boolean is
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312 ch : int;
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313
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314 begin
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315 FIO.Check_Read_Status (AP (File));
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316
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317 if File.Before_Upper_Half_Character then
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318 return False;
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319
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320 elsif File.Before_LM then
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321 if File.Before_LM_PM then
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322 return Nextc (File) = EOF;
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323 end if;
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324
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325 else
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326 ch := Getc (File);
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327
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328 if ch = EOF then
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329 return True;
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330
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331 elsif ch /= LM then
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332 Ungetc (ch, File);
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333 return False;
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334
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335 else -- ch = LM
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336 File.Before_LM := True;
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337 end if;
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338 end if;
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339
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340 -- Here we are just past the line mark with Before_LM set so that we
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341 -- do not have to try to back up past the LM, thus avoiding the need
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342 -- to back up more than one character.
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343
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344 ch := Getc (File);
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345
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346 if ch = EOF then
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347 return True;
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348
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349 elsif ch = PM and then File.Is_Regular_File then
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350 File.Before_LM_PM := True;
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351 return Nextc (File) = EOF;
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352
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353 -- Here if neither EOF nor PM followed end of line
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354
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355 else
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356 Ungetc (ch, File);
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357 return False;
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358 end if;
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359
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360 end End_Of_File;
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361
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362 function End_Of_File return Boolean is
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363 begin
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364 return End_Of_File (Current_In);
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365 end End_Of_File;
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366
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367 -----------------
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368 -- End_Of_Line --
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369 -----------------
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370
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371 function End_Of_Line (File : File_Type) return Boolean is
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372 ch : int;
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373
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374 begin
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375 FIO.Check_Read_Status (AP (File));
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376
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377 if File.Before_Upper_Half_Character then
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378 return False;
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379
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380 elsif File.Before_LM then
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381 return True;
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382
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383 else
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384 ch := Getc (File);
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385
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386 if ch = EOF then
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387 return True;
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388
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389 else
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390 Ungetc (ch, File);
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391 return (ch = LM);
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392 end if;
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393 end if;
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394 end End_Of_Line;
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395
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396 function End_Of_Line return Boolean is
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397 begin
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398 return End_Of_Line (Current_In);
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399 end End_Of_Line;
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400
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401 -----------------
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402 -- End_Of_Page --
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403 -----------------
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404
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405 function End_Of_Page (File : File_Type) return Boolean is
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406 ch : int;
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407
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408 begin
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409 FIO.Check_Read_Status (AP (File));
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410
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411 if not File.Is_Regular_File then
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412 return False;
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413
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414 elsif File.Before_Upper_Half_Character then
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415 return False;
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416
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417 elsif File.Before_LM then
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418 if File.Before_LM_PM then
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419 return True;
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420 end if;
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421
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422 else
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423 ch := Getc (File);
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424
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425 if ch = EOF then
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426 return True;
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427
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428 elsif ch /= LM then
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429 Ungetc (ch, File);
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430 return False;
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431
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432 else -- ch = LM
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433 File.Before_LM := True;
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434 end if;
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435 end if;
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436
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437 -- Here we are just past the line mark with Before_LM set so that we
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438 -- do not have to try to back up past the LM, thus avoiding the need
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439 -- to back up more than one character.
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440
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441 ch := Nextc (File);
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442
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443 return ch = PM or else ch = EOF;
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444 end End_Of_Page;
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445
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446 function End_Of_Page return Boolean is
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447 begin
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448 return End_Of_Page (Current_In);
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449 end End_Of_Page;
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450
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451 --------------
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452 -- EOF_Char --
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453 --------------
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454
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455 function EOF_Char return Integer is
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456 begin
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457 return EOF;
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458 end EOF_Char;
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459
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460 -----------
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461 -- Flush --
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462 -----------
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463
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464 procedure Flush (File : File_Type) is
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465 begin
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466 FIO.Flush (AP (File));
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467 end Flush;
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468
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469 procedure Flush is
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470 begin
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471 Flush (Current_Out);
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472 end Flush;
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473
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474 ----------
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475 -- Form --
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476 ----------
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477
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478 function Form (File : File_Type) return String is
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479 begin
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480 return FIO.Form (AP (File));
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481 end Form;
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482
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483 ---------
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484 -- Get --
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485 ---------
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486
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487 procedure Get
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488 (File : File_Type;
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489 Item : out Character)
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490 is
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491 ch : int;
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492
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493 begin
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494 FIO.Check_Read_Status (AP (File));
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495
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496 if File.Before_Upper_Half_Character then
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497 File.Before_Upper_Half_Character := False;
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498 Item := File.Saved_Upper_Half_Character;
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499
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500 elsif File.Before_LM then
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501 File.Before_LM := False;
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502 File.Col := 1;
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503
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504 if File.Before_LM_PM then
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505 File.Line := 1;
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506 File.Page := File.Page + 1;
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507 File.Before_LM_PM := False;
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508 else
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509 File.Line := File.Line + 1;
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510 end if;
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511 end if;
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512
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513 loop
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514 ch := Getc (File);
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515
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516 if ch = EOF then
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517 raise End_Error;
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518
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519 elsif ch = LM then
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520 File.Line := File.Line + 1;
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521 File.Col := 1;
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522
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523 elsif ch = PM and then File.Is_Regular_File then
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524 File.Page := File.Page + 1;
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525 File.Line := 1;
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526
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527 else
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528 Item := Character'Val (ch);
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529 File.Col := File.Col + 1;
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530 return;
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531 end if;
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532 end loop;
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533 end Get;
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534
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535 procedure Get (Item : out Character) is
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536 begin
|
|
537 Get (Current_In, Item);
|
|
538 end Get;
|
|
539
|
|
540 procedure Get
|
|
541 (File : File_Type;
|
|
542 Item : out String)
|
|
543 is
|
|
544 ch : int;
|
|
545 J : Natural;
|
|
546
|
|
547 begin
|
|
548 FIO.Check_Read_Status (AP (File));
|
|
549
|
|
550 if File.Before_LM then
|
|
551 File.Before_LM := False;
|
|
552 File.Before_LM_PM := False;
|
|
553 File.Col := 1;
|
|
554
|
|
555 if File.Before_LM_PM then
|
|
556 File.Line := 1;
|
|
557 File.Page := File.Page + 1;
|
|
558 File.Before_LM_PM := False;
|
|
559
|
|
560 else
|
|
561 File.Line := File.Line + 1;
|
|
562 end if;
|
|
563 end if;
|
|
564
|
|
565 J := Item'First;
|
|
566 while J <= Item'Last loop
|
|
567 ch := Getc (File);
|
|
568
|
|
569 if ch = EOF then
|
|
570 raise End_Error;
|
|
571
|
|
572 elsif ch = LM then
|
|
573 File.Line := File.Line + 1;
|
|
574 File.Col := 1;
|
|
575
|
|
576 elsif ch = PM and then File.Is_Regular_File then
|
|
577 File.Page := File.Page + 1;
|
|
578 File.Line := 1;
|
|
579
|
|
580 else
|
|
581 Item (J) := Character'Val (ch);
|
|
582 J := J + 1;
|
|
583 File.Col := File.Col + 1;
|
|
584 end if;
|
|
585 end loop;
|
|
586 end Get;
|
|
587
|
|
588 procedure Get (Item : out String) is
|
|
589 begin
|
|
590 Get (Current_In, Item);
|
|
591 end Get;
|
|
592
|
|
593 -------------------
|
|
594 -- Get_Immediate --
|
|
595 -------------------
|
|
596
|
|
597 procedure Get_Immediate
|
|
598 (File : File_Type;
|
|
599 Item : out Character)
|
|
600 is
|
|
601 ch : int;
|
|
602
|
|
603 begin
|
|
604 FIO.Check_Read_Status (AP (File));
|
|
605
|
|
606 if File.Before_Upper_Half_Character then
|
|
607 File.Before_Upper_Half_Character := False;
|
|
608 Item := File.Saved_Upper_Half_Character;
|
|
609
|
|
610 elsif File.Before_LM then
|
|
611 File.Before_LM := False;
|
|
612 File.Before_LM_PM := False;
|
|
613 Item := Character'Val (LM);
|
|
614
|
|
615 else
|
|
616 ch := Getc_Immed (File);
|
|
617
|
|
618 if ch = EOF then
|
|
619 raise End_Error;
|
|
620 else
|
|
621 Item :=
|
|
622 (if not Is_Start_Of_Encoding (Character'Val (ch), File.WC_Method)
|
|
623 then Character'Val (ch)
|
|
624 else Get_Upper_Half_Char_Immed (Character'Val (ch), File));
|
|
625 end if;
|
|
626 end if;
|
|
627 end Get_Immediate;
|
|
628
|
|
629 procedure Get_Immediate
|
|
630 (Item : out Character)
|
|
631 is
|
|
632 begin
|
|
633 Get_Immediate (Current_In, Item);
|
|
634 end Get_Immediate;
|
|
635
|
|
636 procedure Get_Immediate
|
|
637 (File : File_Type;
|
|
638 Item : out Character;
|
|
639 Available : out Boolean)
|
|
640 is
|
|
641 ch : int;
|
|
642 end_of_file : int;
|
|
643 avail : int;
|
|
644
|
|
645 procedure getc_immediate_nowait
|
|
646 (stream : FILEs;
|
|
647 ch : out int;
|
|
648 end_of_file : out int;
|
|
649 avail : out int);
|
|
650 pragma Import (C, getc_immediate_nowait, "getc_immediate_nowait");
|
|
651
|
|
652 begin
|
|
653 FIO.Check_Read_Status (AP (File));
|
|
654 Available := True;
|
|
655
|
|
656 if File.Before_Upper_Half_Character then
|
|
657 File.Before_Upper_Half_Character := False;
|
|
658 Item := File.Saved_Upper_Half_Character;
|
|
659
|
|
660 elsif File.Before_LM then
|
|
661 File.Before_LM := False;
|
|
662 File.Before_LM_PM := False;
|
|
663 Item := Character'Val (LM);
|
|
664
|
|
665 else
|
|
666 getc_immediate_nowait (File.Stream, ch, end_of_file, avail);
|
|
667
|
|
668 if ferror (File.Stream) /= 0 then
|
|
669 raise Device_Error;
|
|
670
|
|
671 elsif end_of_file /= 0 then
|
|
672 raise End_Error;
|
|
673
|
|
674 elsif avail = 0 then
|
|
675 Available := False;
|
|
676 Item := ASCII.NUL;
|
|
677
|
|
678 else
|
|
679 Available := True;
|
|
680
|
|
681 Item :=
|
|
682 (if not Is_Start_Of_Encoding (Character'Val (ch), File.WC_Method)
|
|
683 then Character'Val (ch)
|
|
684 else Get_Upper_Half_Char_Immed (Character'Val (ch), File));
|
|
685 end if;
|
|
686 end if;
|
|
687
|
|
688 end Get_Immediate;
|
|
689
|
|
690 procedure Get_Immediate
|
|
691 (Item : out Character;
|
|
692 Available : out Boolean)
|
|
693 is
|
|
694 begin
|
|
695 Get_Immediate (Current_In, Item, Available);
|
|
696 end Get_Immediate;
|
|
697
|
|
698 --------------
|
|
699 -- Get_Line --
|
|
700 --------------
|
|
701
|
|
702 procedure Get_Line
|
|
703 (File : File_Type;
|
|
704 Item : out String;
|
|
705 Last : out Natural) is separate;
|
|
706 -- The implementation of Ada.Text_IO.Get_Line is split into a subunit so
|
|
707 -- that different implementations can be used on different systems.
|
|
708
|
|
709 procedure Get_Line
|
|
710 (Item : out String;
|
|
711 Last : out Natural)
|
|
712 is
|
|
713 begin
|
|
714 Get_Line (Current_In, Item, Last);
|
|
715 end Get_Line;
|
|
716
|
|
717 function Get_Line (File : File_Type) return String is
|
|
718 function Get_Rest (S : String) return String;
|
|
719 -- This is a recursive function that reads the rest of the line and
|
|
720 -- returns it. S is the part read so far.
|
|
721
|
|
722 --------------
|
|
723 -- Get_Rest --
|
|
724 --------------
|
|
725
|
|
726 function Get_Rest (S : String) return String is
|
|
727
|
|
728 -- The first time we allocate a buffer of size 500. Each following
|
|
729 -- time we allocate a buffer the same size as what we have read so
|
|
730 -- far. This limits us to a logarithmic number of calls to Get_Rest
|
|
731 -- and also ensures only a linear use of stack space.
|
|
732
|
|
733 Buffer : String (1 .. Integer'Max (500, S'Length));
|
|
734 Last : Natural;
|
|
735
|
|
736 begin
|
|
737 Get_Line (File, Buffer, Last);
|
|
738
|
|
739 declare
|
|
740 R : constant String := S & Buffer (1 .. Last);
|
|
741 begin
|
|
742 if Last < Buffer'Last then
|
|
743 return R;
|
|
744
|
|
745 else
|
|
746 pragma Assert (Last = Buffer'Last);
|
|
747
|
|
748 -- If the String has the same length as the buffer, and there
|
|
749 -- is no end of line, check whether we are at the end of file,
|
|
750 -- in which case we have the full String in the buffer.
|
|
751
|
|
752 if End_Of_File (File) then
|
|
753 return R;
|
|
754
|
|
755 else
|
|
756 return Get_Rest (R);
|
|
757 end if;
|
|
758 end if;
|
|
759 end;
|
|
760 end Get_Rest;
|
|
761
|
|
762 -- Start of processing for Get_Line
|
|
763
|
|
764 begin
|
|
765 return Get_Rest ("");
|
|
766 end Get_Line;
|
|
767
|
|
768 function Get_Line return String is
|
|
769 begin
|
|
770 return Get_Line (Current_In);
|
|
771 end Get_Line;
|
|
772
|
|
773 -------------------------
|
|
774 -- Get_Upper_Half_Char --
|
|
775 -------------------------
|
|
776
|
|
777 function Get_Upper_Half_Char
|
|
778 (C : Character;
|
|
779 File : File_Type) return Character
|
|
780 is
|
|
781 Result : Wide_Character;
|
|
782
|
|
783 function In_Char return Character;
|
|
784 -- Function used to obtain additional characters it the wide character
|
|
785 -- sequence is more than one character long.
|
|
786
|
|
787 function WC_In is new Char_Sequence_To_Wide_Char (In_Char);
|
|
788
|
|
789 -------------
|
|
790 -- In_Char --
|
|
791 -------------
|
|
792
|
|
793 function In_Char return Character is
|
|
794 ch : constant Integer := Getc (File);
|
|
795 begin
|
|
796 if ch = EOF then
|
|
797 raise End_Error;
|
|
798 else
|
|
799 return Character'Val (ch);
|
|
800 end if;
|
|
801 end In_Char;
|
|
802
|
|
803 -- Start of processing for Get_Upper_Half_Char
|
|
804
|
|
805 begin
|
|
806 Result := WC_In (C, File.WC_Method);
|
|
807
|
|
808 if Wide_Character'Pos (Result) > 16#FF# then
|
|
809 raise Constraint_Error with
|
|
810 "invalid wide character in Text_'I'O input";
|
|
811 else
|
|
812 return Character'Val (Wide_Character'Pos (Result));
|
|
813 end if;
|
|
814 end Get_Upper_Half_Char;
|
|
815
|
|
816 -------------------------------
|
|
817 -- Get_Upper_Half_Char_Immed --
|
|
818 -------------------------------
|
|
819
|
|
820 function Get_Upper_Half_Char_Immed
|
|
821 (C : Character;
|
|
822 File : File_Type) return Character
|
|
823 is
|
|
824 Result : Wide_Character;
|
|
825
|
|
826 function In_Char return Character;
|
|
827 -- Function used to obtain additional characters it the wide character
|
|
828 -- sequence is more than one character long.
|
|
829
|
|
830 function WC_In is new Char_Sequence_To_Wide_Char (In_Char);
|
|
831
|
|
832 -------------
|
|
833 -- In_Char --
|
|
834 -------------
|
|
835
|
|
836 function In_Char return Character is
|
|
837 ch : constant Integer := Getc_Immed (File);
|
|
838 begin
|
|
839 if ch = EOF then
|
|
840 raise End_Error;
|
|
841 else
|
|
842 return Character'Val (ch);
|
|
843 end if;
|
|
844 end In_Char;
|
|
845
|
|
846 -- Start of processing for Get_Upper_Half_Char_Immed
|
|
847
|
|
848 begin
|
|
849 Result := WC_In (C, File.WC_Method);
|
|
850
|
|
851 if Wide_Character'Pos (Result) > 16#FF# then
|
|
852 raise Constraint_Error with
|
|
853 "invalid wide character in Text_'I'O input";
|
|
854 else
|
|
855 return Character'Val (Wide_Character'Pos (Result));
|
|
856 end if;
|
|
857 end Get_Upper_Half_Char_Immed;
|
|
858
|
|
859 ----------
|
|
860 -- Getc --
|
|
861 ----------
|
|
862
|
|
863 function Getc (File : File_Type) return int is
|
|
864 ch : int;
|
|
865
|
|
866 begin
|
|
867 ch := fgetc (File.Stream);
|
|
868
|
|
869 if ch = EOF and then ferror (File.Stream) /= 0 then
|
|
870 raise Device_Error;
|
|
871 else
|
|
872 return ch;
|
|
873 end if;
|
|
874 end Getc;
|
|
875
|
|
876 ----------------
|
|
877 -- Getc_Immed --
|
|
878 ----------------
|
|
879
|
|
880 function Getc_Immed (File : File_Type) return int is
|
|
881 ch : int;
|
|
882 end_of_file : int;
|
|
883
|
|
884 procedure getc_immediate
|
|
885 (stream : FILEs; ch : out int; end_of_file : out int);
|
|
886 pragma Import (C, getc_immediate, "getc_immediate");
|
|
887
|
|
888 begin
|
|
889 FIO.Check_Read_Status (AP (File));
|
|
890
|
|
891 if File.Before_LM then
|
|
892 File.Before_LM := False;
|
|
893 File.Before_LM_PM := False;
|
|
894 ch := LM;
|
|
895
|
|
896 else
|
|
897 getc_immediate (File.Stream, ch, end_of_file);
|
|
898
|
|
899 if ferror (File.Stream) /= 0 then
|
|
900 raise Device_Error;
|
|
901 elsif end_of_file /= 0 then
|
|
902 return EOF;
|
|
903 end if;
|
|
904 end if;
|
|
905
|
|
906 return ch;
|
|
907 end Getc_Immed;
|
|
908
|
|
909 ------------------------------
|
|
910 -- Has_Upper_Half_Character --
|
|
911 ------------------------------
|
|
912
|
|
913 function Has_Upper_Half_Character (Item : String) return Boolean is
|
|
914 begin
|
|
915 for J in Item'Range loop
|
|
916 if Character'Pos (Item (J)) >= 16#80# then
|
|
917 return True;
|
|
918 end if;
|
|
919 end loop;
|
|
920
|
|
921 return False;
|
|
922 end Has_Upper_Half_Character;
|
|
923
|
|
924 -------------------------------
|
|
925 -- Initialize_Standard_Files --
|
|
926 -------------------------------
|
|
927
|
|
928 procedure Initialize_Standard_Files is
|
|
929 begin
|
|
930 Standard_Err.Stream := stderr;
|
|
931 Standard_Err.Name := Err_Name'Access;
|
|
932 Standard_Err.Form := Null_Str'Unrestricted_Access;
|
|
933 Standard_Err.Mode := FCB.Out_File;
|
|
934 Standard_Err.Is_Regular_File := is_regular_file (fileno (stderr)) /= 0;
|
|
935 Standard_Err.Is_Temporary_File := False;
|
|
936 Standard_Err.Is_System_File := True;
|
|
937 Standard_Err.Text_Encoding := Default_Text;
|
|
938 Standard_Err.Access_Method := 'T';
|
|
939 Standard_Err.Self := Standard_Err;
|
|
940 Standard_Err.WC_Method := Default_WCEM;
|
|
941
|
|
942 Standard_In.Stream := stdin;
|
|
943 Standard_In.Name := In_Name'Access;
|
|
944 Standard_In.Form := Null_Str'Unrestricted_Access;
|
|
945 Standard_In.Mode := FCB.In_File;
|
|
946 Standard_In.Is_Regular_File := is_regular_file (fileno (stdin)) /= 0;
|
|
947 Standard_In.Is_Temporary_File := False;
|
|
948 Standard_In.Is_System_File := True;
|
|
949 Standard_In.Text_Encoding := Default_Text;
|
|
950 Standard_In.Access_Method := 'T';
|
|
951 Standard_In.Self := Standard_In;
|
|
952 Standard_In.WC_Method := Default_WCEM;
|
|
953
|
|
954 Standard_Out.Stream := stdout;
|
|
955 Standard_Out.Name := Out_Name'Access;
|
|
956 Standard_Out.Form := Null_Str'Unrestricted_Access;
|
|
957 Standard_Out.Mode := FCB.Out_File;
|
|
958 Standard_Out.Is_Regular_File := is_regular_file (fileno (stdout)) /= 0;
|
|
959 Standard_Out.Is_Temporary_File := False;
|
|
960 Standard_Out.Is_System_File := True;
|
|
961 Standard_Out.Text_Encoding := Default_Text;
|
|
962 Standard_Out.Access_Method := 'T';
|
|
963 Standard_Out.Self := Standard_Out;
|
|
964 Standard_Out.WC_Method := Default_WCEM;
|
|
965
|
|
966 FIO.Make_Unbuffered (AP (Standard_Out));
|
|
967 FIO.Make_Unbuffered (AP (Standard_Err));
|
|
968 end Initialize_Standard_Files;
|
|
969
|
|
970 -------------
|
|
971 -- Is_Open --
|
|
972 -------------
|
|
973
|
|
974 function Is_Open (File : File_Type) return Boolean is
|
|
975 begin
|
|
976 return FIO.Is_Open (AP (File));
|
|
977 end Is_Open;
|
|
978
|
|
979 ----------
|
|
980 -- Line --
|
|
981 ----------
|
|
982
|
|
983 -- Note: we assume that it is impossible in practice for the line
|
|
984 -- to exceed the value of Count'Last, i.e. no check is required for
|
|
985 -- overflow raising layout error.
|
|
986
|
|
987 function Line (File : File_Type) return Positive_Count is
|
|
988 begin
|
|
989 FIO.Check_File_Open (AP (File));
|
|
990 return File.Line;
|
|
991 end Line;
|
|
992
|
|
993 function Line return Positive_Count is
|
|
994 begin
|
|
995 return Line (Current_Out);
|
|
996 end Line;
|
|
997
|
|
998 -----------------
|
|
999 -- Line_Length --
|
|
1000 -----------------
|
|
1001
|
|
1002 function Line_Length (File : File_Type) return Count is
|
|
1003 begin
|
|
1004 FIO.Check_Write_Status (AP (File));
|
|
1005 return File.Line_Length;
|
|
1006 end Line_Length;
|
|
1007
|
|
1008 function Line_Length return Count is
|
|
1009 begin
|
|
1010 return Line_Length (Current_Out);
|
|
1011 end Line_Length;
|
|
1012
|
|
1013 ----------------
|
|
1014 -- Look_Ahead --
|
|
1015 ----------------
|
|
1016
|
|
1017 procedure Look_Ahead
|
|
1018 (File : File_Type;
|
|
1019 Item : out Character;
|
|
1020 End_Of_Line : out Boolean)
|
|
1021 is
|
|
1022 ch : int;
|
|
1023
|
|
1024 begin
|
|
1025 FIO.Check_Read_Status (AP (File));
|
|
1026
|
|
1027 -- If we are logically before a line mark, we can return immediately
|
|
1028
|
|
1029 if File.Before_LM then
|
|
1030 End_Of_Line := True;
|
|
1031 Item := ASCII.NUL;
|
|
1032
|
|
1033 -- If we are before an upper half character just return it (this can
|
|
1034 -- happen if there are two calls to Look_Ahead in a row).
|
|
1035
|
|
1036 elsif File.Before_Upper_Half_Character then
|
|
1037 End_Of_Line := False;
|
|
1038 Item := File.Saved_Upper_Half_Character;
|
|
1039
|
|
1040 -- Otherwise we must read a character from the input stream
|
|
1041
|
|
1042 else
|
|
1043 ch := Getc (File);
|
|
1044
|
|
1045 if ch = LM
|
|
1046 or else ch = EOF
|
|
1047 or else (ch = PM and then File.Is_Regular_File)
|
|
1048 then
|
|
1049 End_Of_Line := True;
|
|
1050 Ungetc (ch, File);
|
|
1051 Item := ASCII.NUL;
|
|
1052
|
|
1053 -- Case where character obtained does not represent the start of an
|
|
1054 -- encoded sequence so it stands for itself and we can unget it with
|
|
1055 -- no difficulty.
|
|
1056
|
|
1057 elsif not Is_Start_Of_Encoding
|
|
1058 (Character'Val (ch), File.WC_Method)
|
|
1059 then
|
|
1060 End_Of_Line := False;
|
|
1061 Ungetc (ch, File);
|
|
1062 Item := Character'Val (ch);
|
|
1063
|
|
1064 -- For the start of an encoding, we read the character using the
|
|
1065 -- Get_Upper_Half_Char routine. It will occupy more than one byte
|
|
1066 -- so we can't put it back with ungetc. Instead we save it in the
|
|
1067 -- control block, setting a flag that everyone interested in reading
|
|
1068 -- characters must test before reading the stream.
|
|
1069
|
|
1070 else
|
|
1071 Item := Get_Upper_Half_Char (Character'Val (ch), File);
|
|
1072 End_Of_Line := False;
|
|
1073 File.Saved_Upper_Half_Character := Item;
|
|
1074 File.Before_Upper_Half_Character := True;
|
|
1075 end if;
|
|
1076 end if;
|
|
1077 end Look_Ahead;
|
|
1078
|
|
1079 procedure Look_Ahead
|
|
1080 (Item : out Character;
|
|
1081 End_Of_Line : out Boolean)
|
|
1082 is
|
|
1083 begin
|
|
1084 Look_Ahead (Current_In, Item, End_Of_Line);
|
|
1085 end Look_Ahead;
|
|
1086
|
|
1087 ----------
|
|
1088 -- Mode --
|
|
1089 ----------
|
|
1090
|
|
1091 function Mode (File : File_Type) return File_Mode is
|
|
1092 begin
|
|
1093 return To_TIO (FIO.Mode (AP (File)));
|
|
1094 end Mode;
|
|
1095
|
|
1096 ----------
|
|
1097 -- Name --
|
|
1098 ----------
|
|
1099
|
|
1100 function Name (File : File_Type) return String is
|
|
1101 begin
|
|
1102 return FIO.Name (AP (File));
|
|
1103 end Name;
|
|
1104
|
|
1105 --------------
|
|
1106 -- New_Line --
|
|
1107 --------------
|
|
1108
|
|
1109 procedure New_Line
|
|
1110 (File : File_Type;
|
|
1111 Spacing : Positive_Count := 1)
|
|
1112 is
|
|
1113 begin
|
|
1114 -- Raise Constraint_Error if out of range value. The reason for this
|
|
1115 -- explicit test is that we don't want junk values around, even if
|
|
1116 -- checks are off in the caller.
|
|
1117
|
|
1118 if not Spacing'Valid then
|
|
1119 raise Constraint_Error;
|
|
1120 end if;
|
|
1121
|
|
1122 FIO.Check_Write_Status (AP (File));
|
|
1123
|
|
1124 for K in 1 .. Spacing loop
|
|
1125 Putc (LM, File);
|
|
1126 File.Line := File.Line + 1;
|
|
1127
|
|
1128 if File.Page_Length /= 0
|
|
1129 and then File.Line > File.Page_Length
|
|
1130 then
|
|
1131 Putc (PM, File);
|
|
1132 File.Line := 1;
|
|
1133 File.Page := File.Page + 1;
|
|
1134 end if;
|
|
1135 end loop;
|
|
1136
|
|
1137 File.Col := 1;
|
|
1138 end New_Line;
|
|
1139
|
|
1140 procedure New_Line (Spacing : Positive_Count := 1) is
|
|
1141 begin
|
|
1142 New_Line (Current_Out, Spacing);
|
|
1143 end New_Line;
|
|
1144
|
|
1145 --------------
|
|
1146 -- New_Page --
|
|
1147 --------------
|
|
1148
|
|
1149 procedure New_Page (File : File_Type) is
|
|
1150 begin
|
|
1151 FIO.Check_Write_Status (AP (File));
|
|
1152
|
|
1153 if File.Col /= 1 or else File.Line = 1 then
|
|
1154 Putc (LM, File);
|
|
1155 end if;
|
|
1156
|
|
1157 Putc (PM, File);
|
|
1158 File.Page := File.Page + 1;
|
|
1159 File.Line := 1;
|
|
1160 File.Col := 1;
|
|
1161 end New_Page;
|
|
1162
|
|
1163 procedure New_Page is
|
|
1164 begin
|
|
1165 New_Page (Current_Out);
|
|
1166 end New_Page;
|
|
1167
|
|
1168 -----------
|
|
1169 -- Nextc --
|
|
1170 -----------
|
|
1171
|
|
1172 function Nextc (File : File_Type) return int is
|
|
1173 ch : int;
|
|
1174
|
|
1175 begin
|
|
1176 ch := fgetc (File.Stream);
|
|
1177
|
|
1178 if ch = EOF then
|
|
1179 if ferror (File.Stream) /= 0 then
|
|
1180 raise Device_Error;
|
|
1181 end if;
|
|
1182
|
|
1183 else
|
|
1184 if ungetc (ch, File.Stream) = EOF then
|
|
1185 raise Device_Error;
|
|
1186 end if;
|
|
1187 end if;
|
|
1188
|
|
1189 return ch;
|
|
1190 end Nextc;
|
|
1191
|
|
1192 ----------
|
|
1193 -- Open --
|
|
1194 ----------
|
|
1195
|
|
1196 procedure Open
|
|
1197 (File : in out File_Type;
|
|
1198 Mode : File_Mode;
|
|
1199 Name : String;
|
|
1200 Form : String := "")
|
|
1201 is
|
|
1202 Dummy_File_Control_Block : Text_AFCB;
|
|
1203 pragma Warnings (Off, Dummy_File_Control_Block);
|
|
1204 -- Yes, we know this is never assigned a value, only the tag
|
|
1205 -- is used for dispatching purposes, so that's expected.
|
|
1206
|
|
1207 begin
|
|
1208 FIO.Open (File_Ptr => AP (File),
|
|
1209 Dummy_FCB => Dummy_File_Control_Block,
|
|
1210 Mode => To_FCB (Mode),
|
|
1211 Name => Name,
|
|
1212 Form => Form,
|
|
1213 Amethod => 'T',
|
|
1214 Creat => False,
|
|
1215 Text => True);
|
|
1216
|
|
1217 File.Self := File;
|
|
1218 Set_WCEM (File);
|
|
1219 end Open;
|
|
1220
|
|
1221 ----------
|
|
1222 -- Page --
|
|
1223 ----------
|
|
1224
|
|
1225 -- Note: we assume that it is impossible in practice for the page
|
|
1226 -- to exceed the value of Count'Last, i.e. no check is required for
|
|
1227 -- overflow raising layout error.
|
|
1228
|
|
1229 function Page (File : File_Type) return Positive_Count is
|
|
1230 begin
|
|
1231 FIO.Check_File_Open (AP (File));
|
|
1232 return File.Page;
|
|
1233 end Page;
|
|
1234
|
|
1235 function Page return Positive_Count is
|
|
1236 begin
|
|
1237 return Page (Current_Out);
|
|
1238 end Page;
|
|
1239
|
|
1240 -----------------
|
|
1241 -- Page_Length --
|
|
1242 -----------------
|
|
1243
|
|
1244 function Page_Length (File : File_Type) return Count is
|
|
1245 begin
|
|
1246 FIO.Check_Write_Status (AP (File));
|
|
1247 return File.Page_Length;
|
|
1248 end Page_Length;
|
|
1249
|
|
1250 function Page_Length return Count is
|
|
1251 begin
|
|
1252 return Page_Length (Current_Out);
|
|
1253 end Page_Length;
|
|
1254
|
|
1255 ---------
|
|
1256 -- Put --
|
|
1257 ---------
|
|
1258
|
|
1259 procedure Put
|
|
1260 (File : File_Type;
|
|
1261 Item : Character)
|
|
1262 is
|
|
1263 begin
|
|
1264 FIO.Check_Write_Status (AP (File));
|
|
1265
|
|
1266 if File.Line_Length /= 0 and then File.Col > File.Line_Length then
|
|
1267 New_Line (File);
|
|
1268 end if;
|
|
1269
|
|
1270 -- If lower half character, or brackets encoding, output directly
|
|
1271
|
|
1272 if Character'Pos (Item) < 16#80#
|
|
1273 or else File.WC_Method = WCEM_Brackets
|
|
1274 then
|
|
1275 if fputc (Character'Pos (Item), File.Stream) = EOF then
|
|
1276 raise Device_Error;
|
|
1277 end if;
|
|
1278
|
|
1279 -- Case of upper half character with non-brackets encoding
|
|
1280
|
|
1281 else
|
|
1282 Put_Encoded (File, Item);
|
|
1283 end if;
|
|
1284
|
|
1285 File.Col := File.Col + 1;
|
|
1286 end Put;
|
|
1287
|
|
1288 procedure Put (Item : Character) is
|
|
1289 begin
|
|
1290 Put (Current_Out, Item);
|
|
1291 end Put;
|
|
1292
|
|
1293 ---------
|
|
1294 -- Put --
|
|
1295 ---------
|
|
1296
|
|
1297 procedure Put
|
|
1298 (File : File_Type;
|
|
1299 Item : String)
|
|
1300 is
|
|
1301 begin
|
|
1302 FIO.Check_Write_Status (AP (File));
|
|
1303
|
|
1304 -- Only have something to do if string is non-null
|
|
1305
|
|
1306 if Item'Length > 0 then
|
|
1307
|
|
1308 -- If we have bounded lines, or if the file encoding is other than
|
|
1309 -- Brackets and the string has at least one upper half character,
|
|
1310 -- then output the string character by character.
|
|
1311
|
|
1312 if File.Line_Length /= 0
|
|
1313 or else (File.WC_Method /= WCEM_Brackets
|
|
1314 and then Has_Upper_Half_Character (Item))
|
|
1315 then
|
|
1316 for J in Item'Range loop
|
|
1317 Put (File, Item (J));
|
|
1318 end loop;
|
|
1319
|
|
1320 -- Otherwise we can output the entire string at once. Note that if
|
|
1321 -- there are LF or FF characters in the string, we do not bother to
|
|
1322 -- count them as line or page terminators.
|
|
1323
|
|
1324 else
|
|
1325 FIO.Write_Buf (AP (File), Item'Address, Item'Length);
|
|
1326 File.Col := File.Col + Item'Length;
|
|
1327 end if;
|
|
1328 end if;
|
|
1329 end Put;
|
|
1330
|
|
1331 procedure Put (Item : String) is
|
|
1332 begin
|
|
1333 Put (Current_Out, Item);
|
|
1334 end Put;
|
|
1335
|
|
1336 -----------------
|
|
1337 -- Put_Encoded --
|
|
1338 -----------------
|
|
1339
|
|
1340 procedure Put_Encoded (File : File_Type; Char : Character) is
|
|
1341 procedure Out_Char (C : Character);
|
|
1342 -- Procedure to output one character of an upper half encoded sequence
|
|
1343
|
|
1344 procedure WC_Out is new Wide_Char_To_Char_Sequence (Out_Char);
|
|
1345
|
|
1346 --------------
|
|
1347 -- Out_Char --
|
|
1348 --------------
|
|
1349
|
|
1350 procedure Out_Char (C : Character) is
|
|
1351 begin
|
|
1352 Putc (Character'Pos (C), File);
|
|
1353 end Out_Char;
|
|
1354
|
|
1355 -- Start of processing for Put_Encoded
|
|
1356
|
|
1357 begin
|
|
1358 WC_Out (Wide_Character'Val (Character'Pos (Char)), File.WC_Method);
|
|
1359 end Put_Encoded;
|
|
1360
|
|
1361 --------------
|
|
1362 -- Put_Line --
|
|
1363 --------------
|
|
1364
|
|
1365 procedure Put_Line
|
|
1366 (File : File_Type;
|
|
1367 Item : String)
|
|
1368 is
|
|
1369 Ilen : Natural := Item'Length;
|
|
1370 Istart : Natural := Item'First;
|
|
1371
|
|
1372 begin
|
|
1373 FIO.Check_Write_Status (AP (File));
|
|
1374
|
|
1375 -- If we have bounded lines, or if the file encoding is other than
|
|
1376 -- Brackets and the string has at least one upper half character, then
|
|
1377 -- output the string character by character.
|
|
1378
|
|
1379 if File.Line_Length /= 0
|
|
1380 or else (File.WC_Method /= WCEM_Brackets
|
|
1381 and then Has_Upper_Half_Character (Item))
|
|
1382 then
|
|
1383 for J in Item'Range loop
|
|
1384 Put (File, Item (J));
|
|
1385 end loop;
|
|
1386
|
|
1387 New_Line (File);
|
|
1388 return;
|
|
1389 end if;
|
|
1390
|
|
1391 -- Normal case where we do not need to output character by character
|
|
1392
|
|
1393 -- We setup a single string that has the necessary terminators and
|
|
1394 -- then write it with a single call. The reason for doing this is
|
|
1395 -- that it gives better behavior for the use of Put_Line in multi-
|
|
1396 -- tasking programs, since often the OS will treat the entire put
|
|
1397 -- operation as an atomic operation.
|
|
1398
|
|
1399 -- We only do this if the message is 512 characters or less in length,
|
|
1400 -- since otherwise Put_Line would use an unbounded amount of stack
|
|
1401 -- space and could cause undetected stack overflow. If we have a
|
|
1402 -- longer string, then output the first part separately to avoid this.
|
|
1403
|
|
1404 if Ilen > 512 then
|
|
1405 FIO.Write_Buf (AP (File), Item'Address, size_t (Ilen - 512));
|
|
1406 Istart := Istart + Ilen - 512;
|
|
1407 Ilen := 512;
|
|
1408 end if;
|
|
1409
|
|
1410 -- Now prepare the string with its terminator
|
|
1411
|
|
1412 declare
|
|
1413 Buffer : String (1 .. Ilen + 2);
|
|
1414 Plen : size_t;
|
|
1415
|
|
1416 begin
|
|
1417 Buffer (1 .. Ilen) := Item (Istart .. Item'Last);
|
|
1418 Buffer (Ilen + 1) := Character'Val (LM);
|
|
1419
|
|
1420 if File.Page_Length /= 0
|
|
1421 and then File.Line > File.Page_Length
|
|
1422 then
|
|
1423 Buffer (Ilen + 2) := Character'Val (PM);
|
|
1424 Plen := size_t (Ilen) + 2;
|
|
1425 File.Line := 1;
|
|
1426 File.Page := File.Page + 1;
|
|
1427
|
|
1428 else
|
|
1429 Plen := size_t (Ilen) + 1;
|
|
1430 File.Line := File.Line + 1;
|
|
1431 end if;
|
|
1432
|
|
1433 FIO.Write_Buf (AP (File), Buffer'Address, Plen);
|
|
1434
|
|
1435 File.Col := 1;
|
|
1436 end;
|
|
1437 end Put_Line;
|
|
1438
|
|
1439 procedure Put_Line (Item : String) is
|
|
1440 begin
|
|
1441 Put_Line (Current_Out, Item);
|
|
1442 end Put_Line;
|
|
1443
|
|
1444 ----------
|
|
1445 -- Putc --
|
|
1446 ----------
|
|
1447
|
|
1448 procedure Putc (ch : int; File : File_Type) is
|
|
1449 begin
|
|
1450 if fputc (ch, File.Stream) = EOF then
|
|
1451 raise Device_Error;
|
|
1452 end if;
|
|
1453 end Putc;
|
|
1454
|
|
1455 ----------
|
|
1456 -- Read --
|
|
1457 ----------
|
|
1458
|
|
1459 -- This is the primitive Stream Read routine, used when a Text_IO file
|
|
1460 -- is treated directly as a stream using Text_IO.Streams.Stream.
|
|
1461
|
|
1462 procedure Read
|
|
1463 (File : in out Text_AFCB;
|
|
1464 Item : out Stream_Element_Array;
|
|
1465 Last : out Stream_Element_Offset)
|
|
1466 is
|
|
1467 Discard_ch : int;
|
|
1468 pragma Warnings (Off, Discard_ch);
|
|
1469
|
|
1470 begin
|
|
1471 -- Need to deal with Before_Upper_Half_Character ???
|
|
1472
|
|
1473 if File.Mode /= FCB.In_File then
|
|
1474 raise Mode_Error;
|
|
1475 end if;
|
|
1476
|
|
1477 -- Deal with case where our logical and physical position do not match
|
|
1478 -- because of being after an LM or LM-PM sequence when in fact we are
|
|
1479 -- logically positioned before it.
|
|
1480
|
|
1481 if File.Before_LM then
|
|
1482
|
|
1483 -- If we are before a PM, then it is possible for a stream read
|
|
1484 -- to leave us after the LM and before the PM, which is a bit
|
|
1485 -- odd. The easiest way to deal with this is to unget the PM,
|
|
1486 -- so we are indeed positioned between the characters. This way
|
|
1487 -- further stream read operations will work correctly, and the
|
|
1488 -- effect on text processing is a little weird, but what can
|
|
1489 -- be expected if stream and text input are mixed this way?
|
|
1490
|
|
1491 if File.Before_LM_PM then
|
|
1492 Discard_ch := ungetc (PM, File.Stream);
|
|
1493 File.Before_LM_PM := False;
|
|
1494 end if;
|
|
1495
|
|
1496 File.Before_LM := False;
|
|
1497
|
|
1498 Item (Item'First) := Stream_Element (Character'Pos (ASCII.LF));
|
|
1499
|
|
1500 if Item'Length = 1 then
|
|
1501 Last := Item'Last;
|
|
1502
|
|
1503 else
|
|
1504 Last :=
|
|
1505 Item'First +
|
|
1506 Stream_Element_Offset
|
|
1507 (fread (buffer => Item'Address,
|
|
1508 index => size_t (Item'First + 1),
|
|
1509 size => 1,
|
|
1510 count => Item'Length - 1,
|
|
1511 stream => File.Stream));
|
|
1512 end if;
|
|
1513
|
|
1514 return;
|
|
1515 end if;
|
|
1516
|
|
1517 -- Now we do the read. Since this is a text file, it is normally in
|
|
1518 -- text mode, but stream data must be read in binary mode, so we
|
|
1519 -- temporarily set binary mode for the read, resetting it after.
|
|
1520 -- These calls have no effect in a system (like Unix) where there is
|
|
1521 -- no distinction between text and binary files.
|
|
1522
|
|
1523 set_binary_mode (fileno (File.Stream));
|
|
1524
|
|
1525 Last :=
|
|
1526 Item'First +
|
|
1527 Stream_Element_Offset
|
|
1528 (fread (Item'Address, 1, Item'Length, File.Stream)) - 1;
|
|
1529
|
|
1530 if Last < Item'Last then
|
|
1531 if ferror (File.Stream) /= 0 then
|
|
1532 raise Device_Error;
|
|
1533 end if;
|
|
1534 end if;
|
|
1535
|
|
1536 set_text_mode (fileno (File.Stream));
|
|
1537 end Read;
|
|
1538
|
|
1539 -----------
|
|
1540 -- Reset --
|
|
1541 -----------
|
|
1542
|
|
1543 procedure Reset
|
|
1544 (File : in out File_Type;
|
|
1545 Mode : File_Mode)
|
|
1546 is
|
|
1547 begin
|
|
1548 -- Don't allow change of mode for current file (RM A.10.2(5))
|
|
1549
|
|
1550 if (File = Current_In or else
|
|
1551 File = Current_Out or else
|
|
1552 File = Current_Error)
|
|
1553 and then To_FCB (Mode) /= File.Mode
|
|
1554 then
|
|
1555 raise Mode_Error;
|
|
1556 end if;
|
|
1557
|
|
1558 Terminate_Line (File);
|
|
1559 FIO.Reset (AP (File)'Unrestricted_Access, To_FCB (Mode));
|
|
1560 File.Page := 1;
|
|
1561 File.Line := 1;
|
|
1562 File.Col := 1;
|
|
1563 File.Line_Length := 0;
|
|
1564 File.Page_Length := 0;
|
|
1565 File.Before_LM := False;
|
|
1566 File.Before_LM_PM := False;
|
|
1567 end Reset;
|
|
1568
|
|
1569 procedure Reset (File : in out File_Type) is
|
|
1570 begin
|
|
1571 Terminate_Line (File);
|
|
1572 FIO.Reset (AP (File)'Unrestricted_Access);
|
|
1573 File.Page := 1;
|
|
1574 File.Line := 1;
|
|
1575 File.Col := 1;
|
|
1576 File.Line_Length := 0;
|
|
1577 File.Page_Length := 0;
|
|
1578 File.Before_LM := False;
|
|
1579 File.Before_LM_PM := False;
|
|
1580 end Reset;
|
|
1581
|
|
1582 -------------
|
|
1583 -- Set_Col --
|
|
1584 -------------
|
|
1585
|
|
1586 procedure Set_Col
|
|
1587 (File : File_Type;
|
|
1588 To : Positive_Count)
|
|
1589 is
|
|
1590 ch : int;
|
|
1591
|
|
1592 begin
|
|
1593 -- Raise Constraint_Error if out of range value. The reason for this
|
|
1594 -- explicit test is that we don't want junk values around, even if
|
|
1595 -- checks are off in the caller.
|
|
1596
|
|
1597 if not To'Valid then
|
|
1598 raise Constraint_Error;
|
|
1599 end if;
|
|
1600
|
|
1601 FIO.Check_File_Open (AP (File));
|
|
1602
|
|
1603 -- Output case
|
|
1604
|
|
1605 if Mode (File) >= Out_File then
|
|
1606
|
|
1607 -- Error if we attempt to set Col to a value greater than the
|
|
1608 -- maximum permissible line length.
|
|
1609
|
|
1610 if File.Line_Length /= 0 and then To > File.Line_Length then
|
|
1611 raise Layout_Error;
|
|
1612 end if;
|
|
1613
|
|
1614 -- If we are behind current position, then go to start of new line
|
|
1615
|
|
1616 if To < File.Col then
|
|
1617 New_Line (File);
|
|
1618 end if;
|
|
1619
|
|
1620 -- Loop to output blanks till we are at the required column
|
|
1621
|
|
1622 while File.Col < To loop
|
|
1623 Put (File, ' ');
|
|
1624 end loop;
|
|
1625
|
|
1626 -- Input case
|
|
1627
|
|
1628 else
|
|
1629 -- If we are logically before a LM, but physically after it, the
|
|
1630 -- file position still reflects the position before the LM, so eat
|
|
1631 -- it now and adjust the file position appropriately.
|
|
1632
|
|
1633 if File.Before_LM then
|
|
1634 File.Before_LM := False;
|
|
1635 File.Before_LM_PM := False;
|
|
1636 File.Line := File.Line + 1;
|
|
1637 File.Col := 1;
|
|
1638 end if;
|
|
1639
|
|
1640 -- Loop reading characters till we get one at the required Col value
|
|
1641
|
|
1642 loop
|
|
1643 -- Read next character. The reason we have to read ahead is to
|
|
1644 -- skip formatting characters, the effect of Set_Col is to set
|
|
1645 -- us to a real character with the right Col value, and format
|
|
1646 -- characters don't count.
|
|
1647
|
|
1648 ch := Getc (File);
|
|
1649
|
|
1650 -- Error if we hit an end of file
|
|
1651
|
|
1652 if ch = EOF then
|
|
1653 raise End_Error;
|
|
1654
|
|
1655 -- If line mark, eat it and adjust file position
|
|
1656
|
|
1657 elsif ch = LM then
|
|
1658 File.Line := File.Line + 1;
|
|
1659 File.Col := 1;
|
|
1660
|
|
1661 -- If recognized page mark, eat it, and adjust file position
|
|
1662
|
|
1663 elsif ch = PM and then File.Is_Regular_File then
|
|
1664 File.Page := File.Page + 1;
|
|
1665 File.Line := 1;
|
|
1666 File.Col := 1;
|
|
1667
|
|
1668 -- Otherwise this is the character we are looking for, so put it
|
|
1669 -- back in the input stream (we have not adjusted the file
|
|
1670 -- position yet, so everything is set right after this ungetc).
|
|
1671
|
|
1672 elsif To = File.Col then
|
|
1673 Ungetc (ch, File);
|
|
1674 return;
|
|
1675
|
|
1676 -- Keep skipping characters if we are not there yet, updating the
|
|
1677 -- file position past the skipped character.
|
|
1678
|
|
1679 else
|
|
1680 File.Col := File.Col + 1;
|
|
1681 end if;
|
|
1682 end loop;
|
|
1683 end if;
|
|
1684 end Set_Col;
|
|
1685
|
|
1686 procedure Set_Col (To : Positive_Count) is
|
|
1687 begin
|
|
1688 Set_Col (Current_Out, To);
|
|
1689 end Set_Col;
|
|
1690
|
|
1691 ---------------
|
|
1692 -- Set_Error --
|
|
1693 ---------------
|
|
1694
|
|
1695 procedure Set_Error (File : File_Type) is
|
|
1696 begin
|
|
1697 FIO.Check_Write_Status (AP (File));
|
|
1698 Current_Err := File;
|
|
1699 end Set_Error;
|
|
1700
|
|
1701 ---------------
|
|
1702 -- Set_Input --
|
|
1703 ---------------
|
|
1704
|
|
1705 procedure Set_Input (File : File_Type) is
|
|
1706 begin
|
|
1707 FIO.Check_Read_Status (AP (File));
|
|
1708 Current_In := File;
|
|
1709 end Set_Input;
|
|
1710
|
|
1711 --------------
|
|
1712 -- Set_Line --
|
|
1713 --------------
|
|
1714
|
|
1715 procedure Set_Line
|
|
1716 (File : File_Type;
|
|
1717 To : Positive_Count)
|
|
1718 is
|
|
1719 begin
|
|
1720 -- Raise Constraint_Error if out of range value. The reason for this
|
|
1721 -- explicit test is that we don't want junk values around, even if
|
|
1722 -- checks are off in the caller.
|
|
1723
|
|
1724 if not To'Valid then
|
|
1725 raise Constraint_Error;
|
|
1726 end if;
|
|
1727
|
|
1728 FIO.Check_File_Open (AP (File));
|
|
1729
|
|
1730 if To = File.Line then
|
|
1731 return;
|
|
1732 end if;
|
|
1733
|
|
1734 if Mode (File) >= Out_File then
|
|
1735 if File.Page_Length /= 0 and then To > File.Page_Length then
|
|
1736 raise Layout_Error;
|
|
1737 end if;
|
|
1738
|
|
1739 if To < File.Line then
|
|
1740 New_Page (File);
|
|
1741 end if;
|
|
1742
|
|
1743 while File.Line < To loop
|
|
1744 New_Line (File);
|
|
1745 end loop;
|
|
1746
|
|
1747 else
|
|
1748 while To /= File.Line loop
|
|
1749 Skip_Line (File);
|
|
1750 end loop;
|
|
1751 end if;
|
|
1752 end Set_Line;
|
|
1753
|
|
1754 procedure Set_Line (To : Positive_Count) is
|
|
1755 begin
|
|
1756 Set_Line (Current_Out, To);
|
|
1757 end Set_Line;
|
|
1758
|
|
1759 ---------------------
|
|
1760 -- Set_Line_Length --
|
|
1761 ---------------------
|
|
1762
|
|
1763 procedure Set_Line_Length (File : File_Type; To : Count) is
|
|
1764 begin
|
|
1765 -- Raise Constraint_Error if out of range value. The reason for this
|
|
1766 -- explicit test is that we don't want junk values around, even if
|
|
1767 -- checks are off in the caller.
|
|
1768
|
|
1769 if not To'Valid then
|
|
1770 raise Constraint_Error;
|
|
1771 end if;
|
|
1772
|
|
1773 FIO.Check_Write_Status (AP (File));
|
|
1774 File.Line_Length := To;
|
|
1775 end Set_Line_Length;
|
|
1776
|
|
1777 procedure Set_Line_Length (To : Count) is
|
|
1778 begin
|
|
1779 Set_Line_Length (Current_Out, To);
|
|
1780 end Set_Line_Length;
|
|
1781
|
|
1782 ----------------
|
|
1783 -- Set_Output --
|
|
1784 ----------------
|
|
1785
|
|
1786 procedure Set_Output (File : File_Type) is
|
|
1787 begin
|
|
1788 FIO.Check_Write_Status (AP (File));
|
|
1789 Current_Out := File;
|
|
1790 end Set_Output;
|
|
1791
|
|
1792 ---------------------
|
|
1793 -- Set_Page_Length --
|
|
1794 ---------------------
|
|
1795
|
|
1796 procedure Set_Page_Length (File : File_Type; To : Count) is
|
|
1797 begin
|
|
1798 -- Raise Constraint_Error if out of range value. The reason for this
|
|
1799 -- explicit test is that we don't want junk values around, even if
|
|
1800 -- checks are off in the caller.
|
|
1801
|
|
1802 if not To'Valid then
|
|
1803 raise Constraint_Error;
|
|
1804 end if;
|
|
1805
|
|
1806 FIO.Check_Write_Status (AP (File));
|
|
1807 File.Page_Length := To;
|
|
1808 end Set_Page_Length;
|
|
1809
|
|
1810 procedure Set_Page_Length (To : Count) is
|
|
1811 begin
|
|
1812 Set_Page_Length (Current_Out, To);
|
|
1813 end Set_Page_Length;
|
|
1814
|
|
1815 --------------
|
|
1816 -- Set_WCEM --
|
|
1817 --------------
|
|
1818
|
|
1819 procedure Set_WCEM (File : in out File_Type) is
|
|
1820 Start : Natural;
|
|
1821 Stop : Natural;
|
|
1822
|
|
1823 begin
|
|
1824 FIO.Form_Parameter (File.Form.all, "wcem", Start, Stop);
|
|
1825
|
|
1826 if Start = 0 then
|
|
1827 File.WC_Method := Default_WCEM;
|
|
1828
|
|
1829 else
|
|
1830 if Stop = Start then
|
|
1831 for J in WC_Encoding_Letters'Range loop
|
|
1832 if File.Form (Start) = WC_Encoding_Letters (J) then
|
|
1833 File.WC_Method := J;
|
|
1834 return;
|
|
1835 end if;
|
|
1836 end loop;
|
|
1837 end if;
|
|
1838
|
|
1839 Close (File);
|
|
1840 raise Use_Error with "invalid WCEM form parameter";
|
|
1841 end if;
|
|
1842 end Set_WCEM;
|
|
1843
|
|
1844 ---------------
|
|
1845 -- Skip_Line --
|
|
1846 ---------------
|
|
1847
|
|
1848 procedure Skip_Line
|
|
1849 (File : File_Type;
|
|
1850 Spacing : Positive_Count := 1)
|
|
1851 is
|
|
1852 ch : int;
|
|
1853
|
|
1854 begin
|
|
1855 -- Raise Constraint_Error if out of range value. The reason for this
|
|
1856 -- explicit test is that we don't want junk values around, even if
|
|
1857 -- checks are off in the caller.
|
|
1858
|
|
1859 if not Spacing'Valid then
|
|
1860 raise Constraint_Error;
|
|
1861 end if;
|
|
1862
|
|
1863 FIO.Check_Read_Status (AP (File));
|
|
1864
|
|
1865 for L in 1 .. Spacing loop
|
|
1866 if File.Before_LM then
|
|
1867 File.Before_LM := False;
|
|
1868
|
|
1869 -- Note that if File.Before_LM_PM is currently set, we also have
|
|
1870 -- to reset it (because it makes sense for Before_LM_PM to be set
|
|
1871 -- only when Before_LM is also set). This is done later on in this
|
|
1872 -- subprogram, as soon as Before_LM_PM has been taken into account
|
|
1873 -- for the purpose of page and line counts.
|
|
1874
|
|
1875 else
|
|
1876 ch := Getc (File);
|
|
1877
|
|
1878 -- If at end of file now, then immediately raise End_Error. Note
|
|
1879 -- that we can never be positioned between a line mark and a page
|
|
1880 -- mark, so if we are at the end of file, we cannot logically be
|
|
1881 -- before the implicit page mark that is at the end of the file.
|
|
1882
|
|
1883 -- For the same reason, we do not need an explicit check for a
|
|
1884 -- page mark. If there is a FF in the middle of a line, the file
|
|
1885 -- is not in canonical format and we do not care about the page
|
|
1886 -- numbers for files other than ones in canonical format.
|
|
1887
|
|
1888 if ch = EOF then
|
|
1889 raise End_Error;
|
|
1890 end if;
|
|
1891
|
|
1892 -- If not at end of file, then loop till we get to an LM or EOF.
|
|
1893 -- The latter case happens only in non-canonical files where the
|
|
1894 -- last line is not terminated by LM, but we don't want to blow
|
|
1895 -- up for such files, so we assume an implicit LM in this case.
|
|
1896
|
|
1897 loop
|
|
1898 exit when ch = LM or else ch = EOF;
|
|
1899 ch := Getc (File);
|
|
1900 end loop;
|
|
1901 end if;
|
|
1902
|
|
1903 -- We have got past a line mark, now, for a regular file only,
|
|
1904 -- see if a page mark immediately follows this line mark and
|
|
1905 -- if so, skip past the page mark as well. We do not do this
|
|
1906 -- for non-regular files, since it would cause an undesirable
|
|
1907 -- wait for an additional character.
|
|
1908
|
|
1909 File.Col := 1;
|
|
1910 File.Line := File.Line + 1;
|
|
1911
|
|
1912 if File.Before_LM_PM then
|
|
1913 File.Page := File.Page + 1;
|
|
1914 File.Line := 1;
|
|
1915 File.Before_LM_PM := False;
|
|
1916
|
|
1917 elsif File.Is_Regular_File then
|
|
1918 ch := Getc (File);
|
|
1919
|
|
1920 -- Page mark can be explicit, or implied at the end of the file
|
|
1921
|
|
1922 if (ch = PM or else ch = EOF)
|
|
1923 and then File.Is_Regular_File
|
|
1924 then
|
|
1925 File.Page := File.Page + 1;
|
|
1926 File.Line := 1;
|
|
1927 else
|
|
1928 Ungetc (ch, File);
|
|
1929 end if;
|
|
1930 end if;
|
|
1931 end loop;
|
|
1932
|
|
1933 File.Before_Upper_Half_Character := False;
|
|
1934 end Skip_Line;
|
|
1935
|
|
1936 procedure Skip_Line (Spacing : Positive_Count := 1) is
|
|
1937 begin
|
|
1938 Skip_Line (Current_In, Spacing);
|
|
1939 end Skip_Line;
|
|
1940
|
|
1941 ---------------
|
|
1942 -- Skip_Page --
|
|
1943 ---------------
|
|
1944
|
|
1945 procedure Skip_Page (File : File_Type) is
|
|
1946 ch : int;
|
|
1947
|
|
1948 begin
|
|
1949 FIO.Check_Read_Status (AP (File));
|
|
1950
|
|
1951 -- If at page mark already, just skip it
|
|
1952
|
|
1953 if File.Before_LM_PM then
|
|
1954 File.Before_LM := False;
|
|
1955 File.Before_LM_PM := False;
|
|
1956 File.Page := File.Page + 1;
|
|
1957 File.Line := 1;
|
|
1958 File.Col := 1;
|
|
1959 return;
|
|
1960 end if;
|
|
1961
|
|
1962 -- This is a bit tricky, if we are logically before an LM then
|
|
1963 -- it is not an error if we are at an end of file now, since we
|
|
1964 -- are not really at it.
|
|
1965
|
|
1966 if File.Before_LM then
|
|
1967 File.Before_LM := False;
|
|
1968 File.Before_LM_PM := False;
|
|
1969 ch := Getc (File);
|
|
1970
|
|
1971 -- Otherwise we do raise End_Error if we are at the end of file now
|
|
1972
|
|
1973 else
|
|
1974 ch := Getc (File);
|
|
1975
|
|
1976 if ch = EOF then
|
|
1977 raise End_Error;
|
|
1978 end if;
|
|
1979 end if;
|
|
1980
|
|
1981 -- Now we can just rumble along to the next page mark, or to the
|
|
1982 -- end of file, if that comes first. The latter case happens when
|
|
1983 -- the page mark is implied at the end of file.
|
|
1984
|
|
1985 loop
|
|
1986 exit when ch = EOF
|
|
1987 or else (ch = PM and then File.Is_Regular_File);
|
|
1988 ch := Getc (File);
|
|
1989 end loop;
|
|
1990
|
|
1991 File.Page := File.Page + 1;
|
|
1992 File.Line := 1;
|
|
1993 File.Col := 1;
|
|
1994 File.Before_Upper_Half_Character := False;
|
|
1995 end Skip_Page;
|
|
1996
|
|
1997 procedure Skip_Page is
|
|
1998 begin
|
|
1999 Skip_Page (Current_In);
|
|
2000 end Skip_Page;
|
|
2001
|
|
2002 --------------------
|
|
2003 -- Standard_Error --
|
|
2004 --------------------
|
|
2005
|
|
2006 function Standard_Error return File_Type is
|
|
2007 begin
|
|
2008 return Standard_Err;
|
|
2009 end Standard_Error;
|
|
2010
|
|
2011 function Standard_Error return File_Access is
|
|
2012 begin
|
|
2013 return Standard_Err'Access;
|
|
2014 end Standard_Error;
|
|
2015
|
|
2016 --------------------
|
|
2017 -- Standard_Input --
|
|
2018 --------------------
|
|
2019
|
|
2020 function Standard_Input return File_Type is
|
|
2021 begin
|
|
2022 return Standard_In;
|
|
2023 end Standard_Input;
|
|
2024
|
|
2025 function Standard_Input return File_Access is
|
|
2026 begin
|
|
2027 return Standard_In'Access;
|
|
2028 end Standard_Input;
|
|
2029
|
|
2030 ---------------------
|
|
2031 -- Standard_Output --
|
|
2032 ---------------------
|
|
2033
|
|
2034 function Standard_Output return File_Type is
|
|
2035 begin
|
|
2036 return Standard_Out;
|
|
2037 end Standard_Output;
|
|
2038
|
|
2039 function Standard_Output return File_Access is
|
|
2040 begin
|
|
2041 return Standard_Out'Access;
|
|
2042 end Standard_Output;
|
|
2043
|
|
2044 --------------------
|
|
2045 -- Terminate_Line --
|
|
2046 --------------------
|
|
2047
|
|
2048 procedure Terminate_Line (File : File_Type) is
|
|
2049 begin
|
|
2050 FIO.Check_File_Open (AP (File));
|
|
2051
|
|
2052 -- For file other than In_File, test for needing to terminate last line
|
|
2053
|
|
2054 if Mode (File) /= In_File then
|
|
2055
|
|
2056 -- If not at start of line definition need new line
|
|
2057
|
|
2058 if File.Col /= 1 then
|
|
2059 New_Line (File);
|
|
2060
|
|
2061 -- For files other than standard error and standard output, we
|
|
2062 -- make sure that an empty file has a single line feed, so that
|
|
2063 -- it is properly formatted. We avoid this for the standard files
|
|
2064 -- because it is too much of a nuisance to have these odd line
|
|
2065 -- feeds when nothing has been written to the file.
|
|
2066
|
|
2067 -- We also avoid this for files opened in append mode, in
|
|
2068 -- accordance with (RM A.8.2(10))
|
|
2069
|
|
2070 elsif (File /= Standard_Err and then File /= Standard_Out)
|
|
2071 and then (File.Line = 1 and then File.Page = 1)
|
|
2072 and then Mode (File) = Out_File
|
|
2073 then
|
|
2074 New_Line (File);
|
|
2075 end if;
|
|
2076 end if;
|
|
2077 end Terminate_Line;
|
|
2078
|
|
2079 ------------
|
|
2080 -- Ungetc --
|
|
2081 ------------
|
|
2082
|
|
2083 procedure Ungetc (ch : int; File : File_Type) is
|
|
2084 begin
|
|
2085 if ch /= EOF then
|
|
2086 if ungetc (ch, File.Stream) = EOF then
|
|
2087 raise Device_Error;
|
|
2088 end if;
|
|
2089 end if;
|
|
2090 end Ungetc;
|
|
2091
|
|
2092 -----------
|
|
2093 -- Write --
|
|
2094 -----------
|
|
2095
|
|
2096 -- This is the primitive Stream Write routine, used when a Text_IO file
|
|
2097 -- is treated directly as a stream using Text_IO.Streams.Stream.
|
|
2098
|
|
2099 procedure Write
|
|
2100 (File : in out Text_AFCB;
|
|
2101 Item : Stream_Element_Array)
|
|
2102 is
|
|
2103 pragma Warnings (Off, File);
|
|
2104 -- Because in this implementation we don't need IN OUT, we only read
|
|
2105
|
|
2106 function Has_Translated_Characters return Boolean;
|
|
2107 -- return True if Item array contains a character which will be
|
|
2108 -- translated under the text file mode. There is only one such
|
|
2109 -- character under DOS based systems which is character 10.
|
|
2110
|
|
2111 text_translation_required : Boolean;
|
|
2112 for text_translation_required'Size use Character'Size;
|
|
2113 pragma Import (C, text_translation_required,
|
|
2114 "__gnat_text_translation_required");
|
|
2115
|
|
2116 Siz : constant size_t := Item'Length;
|
|
2117
|
|
2118 -------------------------------
|
|
2119 -- Has_Translated_Characters --
|
|
2120 -------------------------------
|
|
2121
|
|
2122 function Has_Translated_Characters return Boolean is
|
|
2123 begin
|
|
2124 for K in Item'Range loop
|
|
2125 if Item (K) = 10 then
|
|
2126 return True;
|
|
2127 end if;
|
|
2128 end loop;
|
|
2129 return False;
|
|
2130 end Has_Translated_Characters;
|
|
2131
|
|
2132 Needs_Binary_Write : constant Boolean :=
|
|
2133 text_translation_required and then Has_Translated_Characters;
|
|
2134
|
|
2135 -- Start of processing for Write
|
|
2136
|
|
2137 begin
|
|
2138 if File.Mode = FCB.In_File then
|
|
2139 raise Mode_Error;
|
|
2140 end if;
|
|
2141
|
|
2142 -- Now we do the write. Since this is a text file, it is normally in
|
|
2143 -- text mode, but stream data must be written in binary mode, so we
|
|
2144 -- temporarily set binary mode for the write, resetting it after. This
|
|
2145 -- is done only if needed (i.e. there is some characters in Item which
|
|
2146 -- needs to be written using the binary mode).
|
|
2147 -- These calls have no effect in a system (like Unix) where there is
|
|
2148 -- no distinction between text and binary files.
|
|
2149
|
|
2150 -- Since the character translation is done at the time the buffer is
|
|
2151 -- written (this is true under Windows) we first flush current buffer
|
|
2152 -- with text mode if needed.
|
|
2153
|
|
2154 if Needs_Binary_Write then
|
|
2155 if fflush (File.Stream) = -1 then
|
|
2156 raise Device_Error;
|
|
2157 end if;
|
|
2158
|
|
2159 set_binary_mode (fileno (File.Stream));
|
|
2160 end if;
|
|
2161
|
|
2162 if fwrite (Item'Address, 1, Siz, File.Stream) /= Siz then
|
|
2163 raise Device_Error;
|
|
2164 end if;
|
|
2165
|
|
2166 -- At this point we need to flush the buffer using the binary mode then
|
|
2167 -- we reset to text mode.
|
|
2168
|
|
2169 if Needs_Binary_Write then
|
|
2170 if fflush (File.Stream) = -1 then
|
|
2171 raise Device_Error;
|
|
2172 end if;
|
|
2173
|
|
2174 set_text_mode (fileno (File.Stream));
|
|
2175 end if;
|
|
2176 end Write;
|
|
2177
|
|
2178 begin
|
|
2179 -- Initialize Standard Files
|
|
2180
|
|
2181 for J in WC_Encoding_Method loop
|
|
2182 if WC_Encoding = WC_Encoding_Letters (J) then
|
|
2183 Default_WCEM := J;
|
|
2184 end if;
|
|
2185 end loop;
|
|
2186
|
|
2187 Initialize_Standard_Files;
|
|
2188
|
|
2189 FIO.Chain_File (AP (Standard_In));
|
|
2190 FIO.Chain_File (AP (Standard_Out));
|
|
2191 FIO.Chain_File (AP (Standard_Err));
|
|
2192
|
|
2193 end Ada.Text_IO;
|