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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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131
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9 -- Copyright (C) 1992-2018, Free Software Foundation, Inc. --
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111
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10 -- --
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11 -- GNAT is free software; you can redistribute it and/or modify it under --
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12 -- terms of the GNU General Public License as published by the Free Soft- --
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13 -- ware Foundation; either version 3, or (at your option) any later ver- --
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14 -- sion. GNAT is distributed in the hope that it will be useful, but WITH- --
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15 -- OUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY --
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16 -- or FITNESS FOR A PARTICULAR PURPOSE. --
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17 -- --
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18 -- As a special exception under Section 7 of GPL version 3, you are granted --
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19 -- additional permissions described in the GCC Runtime Library Exception, --
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20 -- version 3.1, as published by the Free Software Foundation. --
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21 -- --
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22 -- You should have received a copy of the GNU General Public License and --
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23 -- a copy of the GCC Runtime Library Exception along with this program; --
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24 -- see the files COPYING3 and COPYING.RUNTIME respectively. If not, see --
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25 -- <http://www.gnu.org/licenses/>. --
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26 -- --
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27 -- GNAT was originally developed by the GNAT team at New York University. --
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28 -- Extensive contributions were provided by Ada Core Technologies Inc. --
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29 -- --
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30 ------------------------------------------------------------------------------
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31
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32 with Ada.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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46 package body Ada.Text_IO is
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47
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48 package FIO renames System.File_IO;
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49
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50 subtype AP is FCB.AFCB_Ptr;
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51
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52 function To_FCB is new Ada.Unchecked_Conversion (File_Mode, FCB.File_Mode);
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53 function To_TIO is new Ada.Unchecked_Conversion (FCB.File_Mode, File_Mode);
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54 use type FCB.File_Mode;
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55
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56 use type System.CRTL.size_t;
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57
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58 WC_Encoding : Character;
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59 pragma Import (C, WC_Encoding, "__gl_wc_encoding");
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60 -- Default wide character encoding
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61
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62 Err_Name : aliased String := "*stderr" & ASCII.NUL;
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63 In_Name : aliased String := "*stdin" & ASCII.NUL;
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64 Out_Name : aliased String := "*stdout" & ASCII.NUL;
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65 -- Names of standard files
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66 --
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67 -- Use "preallocated" strings to avoid calling "new" during the elaboration
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68 -- of the run time. This is needed in the tasking case to avoid calling
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69 -- Task_Lock too early. A filename is expected to end with a null character
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70 -- in the runtime, here the null characters are added just to have a
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71 -- correct filename length.
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72 --
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73 -- Note: the names for these files are bogus, and probably it would be
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74 -- better for these files to have no names, but the ACVC tests insist.
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75 -- We use names that are bound to fail in open etc.
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76
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77 Null_Str : aliased constant String := "";
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78 -- Used as form string for standard files
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79
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80 -----------------------
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81 -- Local Subprograms --
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82 -----------------------
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83
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84 function Get_Upper_Half_Char
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85 (C : Character;
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86 File : File_Type) return Character;
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87 -- This function is shared by Get and Get_Immediate to extract an encoded
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88 -- upper half character value from the given File. The first byte has
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89 -- already been read and is passed in C. The character value is returned as
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90 -- the result, and the file pointer is bumped past the character.
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91 -- Constraint_Error is raised if the encoded value is outside the bounds of
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92 -- type Character.
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93
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94 function Get_Upper_Half_Char_Immed
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95 (C : Character;
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96 File : File_Type) return Character;
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97 -- This routine is identical to Get_Upper_Half_Char, except that the reads
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98 -- are done in Get_Immediate mode (i.e. without waiting for a line return).
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99
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100 function Getc (File : File_Type) return int;
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101 -- Gets next character from file, which has already been checked for being
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102 -- in read status, and returns the character read if no error occurs. The
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103 -- result is EOF if the end of file was read.
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104
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105 function Getc_Immed (File : File_Type) return int;
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106 -- This routine is identical to Getc, except that the read is done in
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107 -- Get_Immediate mode (i.e. without waiting for a line return).
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108
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109 function Has_Upper_Half_Character (Item : String) return Boolean;
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110 -- Returns True if any of the characters is in the range 16#80#-16#FF#
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111
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112 function Nextc (File : File_Type) return int;
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113 -- Returns next character from file without skipping past it (i.e. it is a
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114 -- combination of Getc followed by an Ungetc).
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115
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116 procedure Put_Encoded (File : File_Type; Char : Character);
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117 -- Called to output a character Char to the given File, when the encoding
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118 -- method for the file is other than brackets, and Char is upper half.
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119
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120 procedure Putc (ch : int; File : File_Type);
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121 -- Outputs the given character to the file, which has already been checked
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122 -- for being in output status. Device_Error is raised if the character
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123 -- cannot be written.
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124
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125 procedure Set_WCEM (File : in out File_Type);
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126 -- Called by Open and Create to set the wide character encoding method for
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127 -- the file, processing a WCEM form parameter if one is present. File is
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128 -- IN OUT because it may be closed in case of an error.
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129
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130 procedure Terminate_Line (File : File_Type);
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131 -- If the file is in Write_File or Append_File mode, and the current line
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132 -- is not terminated, then a line terminator is written using New_Line.
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133 -- Note that there is no Terminate_Page routine, because the page mark at
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134 -- the end of the file is implied if necessary.
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135
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136 procedure Ungetc (ch : int; File : File_Type);
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137 -- Pushes back character into stream, using ungetc. The caller has checked
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138 -- that the file is in read status. Device_Error is raised if the character
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139 -- cannot be pushed back. An attempt to push back and end of file character
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140 -- (EOF) is ignored.
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141
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142 -------------------
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143 -- AFCB_Allocate --
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144 -------------------
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145
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146 function AFCB_Allocate (Control_Block : Text_AFCB) return FCB.AFCB_Ptr is
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147 pragma Unreferenced (Control_Block);
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148 begin
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149 return new Text_AFCB;
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150 end AFCB_Allocate;
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151
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152 ----------------
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153 -- AFCB_Close --
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154 ----------------
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155
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156 procedure AFCB_Close (File : not null access Text_AFCB) is
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157 begin
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158 -- If the file being closed is one of the current files, then close
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159 -- the corresponding current file. It is not clear that this action
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160 -- is required (RM A.10.3(23)) but it seems reasonable, and besides
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161 -- ACVC test CE3208A expects this behavior.
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162
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163 if File_Type (File) = Current_In then
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164 Current_In := null;
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165 elsif File_Type (File) = Current_Out then
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166 Current_Out := null;
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167 elsif File_Type (File) = Current_Err then
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168 Current_Err := null;
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169 end if;
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170
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171 Terminate_Line (File_Type (File));
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172 end AFCB_Close;
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173
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174 ---------------
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175 -- AFCB_Free --
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176 ---------------
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177
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178 procedure AFCB_Free (File : not null access Text_AFCB) is
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179 type FCB_Ptr is access all Text_AFCB;
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180 FT : FCB_Ptr := FCB_Ptr (File);
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181
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182 procedure Free is new Ada.Unchecked_Deallocation (Text_AFCB, FCB_Ptr);
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183
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184 begin
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185 Free (FT);
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186 end AFCB_Free;
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187
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188 -----------
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189 -- Close --
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190 -----------
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191
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192 procedure Close (File : in out File_Type) is
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193 begin
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194 FIO.Close (AP (File)'Unrestricted_Access);
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195 end Close;
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196
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197 ---------
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198 -- Col --
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199 ---------
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200
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201 -- Note: we assume that it is impossible in practice for the column
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202 -- to exceed the value of Count'Last, i.e. no check is required for
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203 -- overflow raising layout error.
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204
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205 function Col (File : File_Type) return Positive_Count is
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206 begin
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207 FIO.Check_File_Open (AP (File));
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208 return File.Col;
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209 end Col;
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210
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211 function Col return Positive_Count is
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212 begin
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213 return Col (Current_Out);
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214 end Col;
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215
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216 ------------
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217 -- Create --
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218 ------------
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219
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220 procedure Create
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221 (File : in out File_Type;
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222 Mode : File_Mode := Out_File;
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223 Name : String := "";
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224 Form : String := "")
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225 is
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226 Dummy_File_Control_Block : Text_AFCB;
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227 pragma Warnings (Off, Dummy_File_Control_Block);
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228 -- Yes, we know this is never assigned a value, only the tag
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229 -- is used for dispatching purposes, so that's expected.
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230
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231 begin
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232 FIO.Open (File_Ptr => AP (File),
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233 Dummy_FCB => Dummy_File_Control_Block,
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234 Mode => To_FCB (Mode),
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235 Name => Name,
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236 Form => Form,
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237 Amethod => 'T',
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238 Creat => True,
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239 Text => True);
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240
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241 File.Self := File;
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242 Set_WCEM (File);
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243 end Create;
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244
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245 -------------------
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246 -- Current_Error --
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247 -------------------
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248
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249 function Current_Error return File_Type is
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250 begin
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251 return Current_Err;
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252 end Current_Error;
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253
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254 function Current_Error return File_Access is
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255 begin
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256 return Current_Err.Self'Access;
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257 end Current_Error;
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258
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259 -------------------
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260 -- Current_Input --
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261 -------------------
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262
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263 function Current_Input return File_Type is
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264 begin
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265 return Current_In;
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266 end Current_Input;
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267
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268 function Current_Input return File_Access is
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269 begin
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270 return Current_In.Self'Access;
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271 end Current_Input;
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272
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273 --------------------
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274 -- Current_Output --
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275 --------------------
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276
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277 function Current_Output return File_Type is
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278 begin
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279 return Current_Out;
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280 end Current_Output;
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281
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282 function Current_Output return File_Access is
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283 begin
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284 return Current_Out.Self'Access;
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285 end Current_Output;
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286
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287 ------------
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288 -- Delete --
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289 ------------
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290
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291 procedure Delete (File : in out File_Type) is
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292 begin
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293 FIO.Delete (AP (File)'Unrestricted_Access);
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294 end Delete;
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295
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296 -----------------
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297 -- End_Of_File --
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298 -----------------
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299
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300 function End_Of_File (File : File_Type) return Boolean is
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301 ch : int;
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302
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303 begin
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304 FIO.Check_Read_Status (AP (File));
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305
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306 if File.Before_Upper_Half_Character then
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307 return False;
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308
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309 elsif File.Before_LM then
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310 if File.Before_LM_PM then
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311 return Nextc (File) = EOF;
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312 end if;
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313
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314 else
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315 ch := Getc (File);
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316
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317 if ch = EOF then
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318 return True;
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319
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320 elsif ch /= LM then
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321 Ungetc (ch, File);
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322 return False;
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323
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324 else -- ch = LM
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325 File.Before_LM := True;
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326 end if;
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327 end if;
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328
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329 -- Here we are just past the line mark with Before_LM set so that we
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330 -- do not have to try to back up past the LM, thus avoiding the need
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331 -- to back up more than one character.
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332
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333 ch := Getc (File);
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334
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335 if ch = EOF then
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336 return True;
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337
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338 elsif ch = PM and then File.Is_Regular_File then
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339 File.Before_LM_PM := True;
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340 return Nextc (File) = EOF;
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341
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342 -- Here if neither EOF nor PM followed end of line
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343
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344 else
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345 Ungetc (ch, File);
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346 return False;
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347 end if;
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348
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349 end End_Of_File;
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350
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351 function End_Of_File return Boolean is
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352 begin
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353 return End_Of_File (Current_In);
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354 end End_Of_File;
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355
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356 -----------------
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357 -- End_Of_Line --
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358 -----------------
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359
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360 function End_Of_Line (File : File_Type) return Boolean is
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361 ch : int;
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362
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363 begin
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364 FIO.Check_Read_Status (AP (File));
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365
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366 if File.Before_Upper_Half_Character then
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367 return False;
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368
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369 elsif File.Before_LM then
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370 return True;
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371
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372 else
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373 ch := Getc (File);
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374
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375 if ch = EOF then
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376 return True;
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377
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378 else
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379 Ungetc (ch, File);
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380 return (ch = LM);
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381 end if;
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382 end if;
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383 end End_Of_Line;
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384
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385 function End_Of_Line return Boolean is
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386 begin
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387 return End_Of_Line (Current_In);
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388 end End_Of_Line;
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389
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390 -----------------
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391 -- End_Of_Page --
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392 -----------------
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393
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394 function End_Of_Page (File : File_Type) return Boolean is
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395 ch : int;
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396
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397 begin
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398 FIO.Check_Read_Status (AP (File));
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399
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400 if not File.Is_Regular_File then
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401 return False;
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402
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403 elsif File.Before_Upper_Half_Character then
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404 return False;
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405
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406 elsif File.Before_LM then
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407 if File.Before_LM_PM then
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408 return True;
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409 end if;
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410
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411 else
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412 ch := Getc (File);
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413
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414 if ch = EOF then
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415 return True;
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416
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417 elsif ch /= LM then
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418 Ungetc (ch, File);
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419 return False;
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420
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421 else -- ch = LM
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422 File.Before_LM := True;
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423 end if;
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424 end if;
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425
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426 -- Here we are just past the line mark with Before_LM set so that we
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427 -- do not have to try to back up past the LM, thus avoiding the need
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428 -- to back up more than one character.
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429
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430 ch := Nextc (File);
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431
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432 return ch = PM or else ch = EOF;
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433 end End_Of_Page;
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434
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435 function End_Of_Page return Boolean is
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436 begin
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437 return End_Of_Page (Current_In);
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438 end End_Of_Page;
|
|
|
439
|
|
|
440 --------------
|
|
|
441 -- EOF_Char --
|
|
|
442 --------------
|
|
|
443
|
|
|
444 function EOF_Char return Integer is
|
|
|
445 begin
|
|
|
446 return EOF;
|
|
|
447 end EOF_Char;
|
|
|
448
|
|
|
449 -----------
|
|
|
450 -- Flush --
|
|
|
451 -----------
|
|
|
452
|
|
|
453 procedure Flush (File : File_Type) is
|
|
|
454 begin
|
|
|
455 FIO.Flush (AP (File));
|
|
|
456 end Flush;
|
|
|
457
|
|
|
458 procedure Flush is
|
|
|
459 begin
|
|
|
460 Flush (Current_Out);
|
|
|
461 end Flush;
|
|
|
462
|
|
|
463 ----------
|
|
|
464 -- Form --
|
|
|
465 ----------
|
|
|
466
|
|
|
467 function Form (File : File_Type) return String is
|
|
|
468 begin
|
|
|
469 return FIO.Form (AP (File));
|
|
|
470 end Form;
|
|
|
471
|
|
|
472 ---------
|
|
|
473 -- Get --
|
|
|
474 ---------
|
|
|
475
|
|
|
476 procedure Get
|
|
|
477 (File : File_Type;
|
|
|
478 Item : out Character)
|
|
|
479 is
|
|
|
480 ch : int;
|
|
|
481
|
|
|
482 begin
|
|
|
483 FIO.Check_Read_Status (AP (File));
|
|
|
484
|
|
|
485 if File.Before_Upper_Half_Character then
|
|
|
486 File.Before_Upper_Half_Character := False;
|
|
|
487 Item := File.Saved_Upper_Half_Character;
|
|
|
488
|
|
|
489 elsif File.Before_LM then
|
|
|
490 File.Before_LM := False;
|
|
|
491 File.Col := 1;
|
|
|
492
|
|
|
493 if File.Before_LM_PM then
|
|
|
494 File.Line := 1;
|
|
|
495 File.Page := File.Page + 1;
|
|
|
496 File.Before_LM_PM := False;
|
|
|
497 else
|
|
|
498 File.Line := File.Line + 1;
|
|
|
499 end if;
|
|
|
500 end if;
|
|
|
501
|
|
|
502 loop
|
|
|
503 ch := Getc (File);
|
|
|
504
|
|
|
505 if ch = EOF then
|
|
|
506 raise End_Error;
|
|
|
507
|
|
|
508 elsif ch = LM then
|
|
|
509 File.Line := File.Line + 1;
|
|
|
510 File.Col := 1;
|
|
|
511
|
|
|
512 elsif ch = PM and then File.Is_Regular_File then
|
|
|
513 File.Page := File.Page + 1;
|
|
|
514 File.Line := 1;
|
|
|
515
|
|
|
516 else
|
|
|
517 Item := Character'Val (ch);
|
|
|
518 File.Col := File.Col + 1;
|
|
|
519 return;
|
|
|
520 end if;
|
|
|
521 end loop;
|
|
|
522 end Get;
|
|
|
523
|
|
|
524 procedure Get (Item : out Character) is
|
|
|
525 begin
|
|
|
526 Get (Current_In, Item);
|
|
|
527 end Get;
|
|
|
528
|
|
|
529 procedure Get
|
|
|
530 (File : File_Type;
|
|
|
531 Item : out String)
|
|
|
532 is
|
|
|
533 ch : int;
|
|
|
534 J : Natural;
|
|
|
535
|
|
|
536 begin
|
|
|
537 FIO.Check_Read_Status (AP (File));
|
|
|
538
|
|
|
539 if File.Before_LM then
|
|
|
540 File.Before_LM := False;
|
|
|
541 File.Before_LM_PM := False;
|
|
|
542 File.Col := 1;
|
|
|
543
|
|
|
544 if File.Before_LM_PM then
|
|
|
545 File.Line := 1;
|
|
|
546 File.Page := File.Page + 1;
|
|
|
547 File.Before_LM_PM := False;
|
|
|
548
|
|
|
549 else
|
|
|
550 File.Line := File.Line + 1;
|
|
|
551 end if;
|
|
|
552 end if;
|
|
|
553
|
|
|
554 J := Item'First;
|
|
|
555 while J <= Item'Last loop
|
|
|
556 ch := Getc (File);
|
|
|
557
|
|
|
558 if ch = EOF then
|
|
|
559 raise End_Error;
|
|
|
560
|
|
|
561 elsif ch = LM then
|
|
|
562 File.Line := File.Line + 1;
|
|
|
563 File.Col := 1;
|
|
|
564
|
|
|
565 elsif ch = PM and then File.Is_Regular_File then
|
|
|
566 File.Page := File.Page + 1;
|
|
|
567 File.Line := 1;
|
|
|
568
|
|
|
569 else
|
|
|
570 Item (J) := Character'Val (ch);
|
|
|
571 J := J + 1;
|
|
|
572 File.Col := File.Col + 1;
|
|
|
573 end if;
|
|
|
574 end loop;
|
|
|
575 end Get;
|
|
|
576
|
|
|
577 procedure Get (Item : out String) is
|
|
|
578 begin
|
|
|
579 Get (Current_In, Item);
|
|
|
580 end Get;
|
|
|
581
|
|
|
582 -------------------
|
|
|
583 -- Get_Immediate --
|
|
|
584 -------------------
|
|
|
585
|
|
|
586 procedure Get_Immediate
|
|
|
587 (File : File_Type;
|
|
|
588 Item : out Character)
|
|
|
589 is
|
|
|
590 ch : int;
|
|
|
591
|
|
|
592 begin
|
|
|
593 FIO.Check_Read_Status (AP (File));
|
|
|
594
|
|
|
595 if File.Before_Upper_Half_Character then
|
|
|
596 File.Before_Upper_Half_Character := False;
|
|
|
597 Item := File.Saved_Upper_Half_Character;
|
|
|
598
|
|
|
599 elsif File.Before_LM then
|
|
|
600 File.Before_LM := False;
|
|
|
601 File.Before_LM_PM := False;
|
|
|
602 Item := Character'Val (LM);
|
|
|
603
|
|
|
604 else
|
|
|
605 ch := Getc_Immed (File);
|
|
|
606
|
|
|
607 if ch = EOF then
|
|
|
608 raise End_Error;
|
|
|
609 else
|
|
|
610 Item :=
|
|
|
611 (if not Is_Start_Of_Encoding (Character'Val (ch), File.WC_Method)
|
|
|
612 then Character'Val (ch)
|
|
|
613 else Get_Upper_Half_Char_Immed (Character'Val (ch), File));
|
|
|
614 end if;
|
|
|
615 end if;
|
|
|
616 end Get_Immediate;
|
|
|
617
|
|
|
618 procedure Get_Immediate
|
|
|
619 (Item : out Character)
|
|
|
620 is
|
|
|
621 begin
|
|
|
622 Get_Immediate (Current_In, Item);
|
|
|
623 end Get_Immediate;
|
|
|
624
|
|
|
625 procedure Get_Immediate
|
|
|
626 (File : File_Type;
|
|
|
627 Item : out Character;
|
|
|
628 Available : out Boolean)
|
|
|
629 is
|
|
|
630 ch : int;
|
|
|
631 end_of_file : int;
|
|
|
632 avail : int;
|
|
|
633
|
|
|
634 procedure getc_immediate_nowait
|
|
|
635 (stream : FILEs;
|
|
|
636 ch : out int;
|
|
|
637 end_of_file : out int;
|
|
|
638 avail : out int);
|
|
|
639 pragma Import (C, getc_immediate_nowait, "getc_immediate_nowait");
|
|
|
640
|
|
|
641 begin
|
|
|
642 FIO.Check_Read_Status (AP (File));
|
|
|
643 Available := True;
|
|
|
644
|
|
|
645 if File.Before_Upper_Half_Character then
|
|
|
646 File.Before_Upper_Half_Character := False;
|
|
|
647 Item := File.Saved_Upper_Half_Character;
|
|
|
648
|
|
|
649 elsif File.Before_LM then
|
|
|
650 File.Before_LM := False;
|
|
|
651 File.Before_LM_PM := False;
|
|
|
652 Item := Character'Val (LM);
|
|
|
653
|
|
|
654 else
|
|
|
655 getc_immediate_nowait (File.Stream, ch, end_of_file, avail);
|
|
|
656
|
|
|
657 if ferror (File.Stream) /= 0 then
|
|
|
658 raise Device_Error;
|
|
|
659
|
|
|
660 elsif end_of_file /= 0 then
|
|
|
661 raise End_Error;
|
|
|
662
|
|
|
663 elsif avail = 0 then
|
|
|
664 Available := False;
|
|
|
665 Item := ASCII.NUL;
|
|
|
666
|
|
|
667 else
|
|
|
668 Available := True;
|
|
|
669
|
|
|
670 Item :=
|
|
|
671 (if not Is_Start_Of_Encoding (Character'Val (ch), File.WC_Method)
|
|
|
672 then Character'Val (ch)
|
|
|
673 else Get_Upper_Half_Char_Immed (Character'Val (ch), File));
|
|
|
674 end if;
|
|
|
675 end if;
|
|
|
676
|
|
|
677 end Get_Immediate;
|
|
|
678
|
|
|
679 procedure Get_Immediate
|
|
|
680 (Item : out Character;
|
|
|
681 Available : out Boolean)
|
|
|
682 is
|
|
|
683 begin
|
|
|
684 Get_Immediate (Current_In, Item, Available);
|
|
|
685 end Get_Immediate;
|
|
|
686
|
|
|
687 --------------
|
|
|
688 -- Get_Line --
|
|
|
689 --------------
|
|
|
690
|
|
|
691 procedure Get_Line
|
|
|
692 (File : File_Type;
|
|
|
693 Item : out String;
|
|
|
694 Last : out Natural) is separate;
|
|
|
695 -- The implementation of Ada.Text_IO.Get_Line is split into a subunit so
|
|
|
696 -- that different implementations can be used on different systems.
|
|
|
697
|
|
|
698 procedure Get_Line
|
|
|
699 (Item : out String;
|
|
|
700 Last : out Natural)
|
|
|
701 is
|
|
|
702 begin
|
|
|
703 Get_Line (Current_In, Item, Last);
|
|
|
704 end Get_Line;
|
|
|
705
|
|
|
706 function Get_Line (File : File_Type) return String is
|
|
|
707 function Get_Rest (S : String) return String;
|
|
|
708 -- This is a recursive function that reads the rest of the line and
|
|
|
709 -- returns it. S is the part read so far.
|
|
|
710
|
|
|
711 --------------
|
|
|
712 -- Get_Rest --
|
|
|
713 --------------
|
|
|
714
|
|
|
715 function Get_Rest (S : String) return String is
|
|
|
716
|
|
|
717 -- The first time we allocate a buffer of size 500. Each following
|
|
|
718 -- time we allocate a buffer the same size as what we have read so
|
|
|
719 -- far. This limits us to a logarithmic number of calls to Get_Rest
|
|
|
720 -- and also ensures only a linear use of stack space.
|
|
|
721
|
|
|
722 Buffer : String (1 .. Integer'Max (500, S'Length));
|
|
|
723 Last : Natural;
|
|
|
724
|
|
|
725 begin
|
|
|
726 Get_Line (File, Buffer, Last);
|
|
|
727
|
|
|
728 declare
|
|
|
729 R : constant String := S & Buffer (1 .. Last);
|
|
|
730 begin
|
|
|
731 if Last < Buffer'Last then
|
|
|
732 return R;
|
|
|
733
|
|
|
734 else
|
|
|
735 pragma Assert (Last = Buffer'Last);
|
|
|
736
|
|
|
737 -- If the String has the same length as the buffer, and there
|
|
|
738 -- is no end of line, check whether we are at the end of file,
|
|
|
739 -- in which case we have the full String in the buffer.
|
|
|
740
|
|
|
741 if End_Of_File (File) then
|
|
|
742 return R;
|
|
|
743
|
|
|
744 else
|
|
|
745 return Get_Rest (R);
|
|
|
746 end if;
|
|
|
747 end if;
|
|
|
748 end;
|
|
|
749 end Get_Rest;
|
|
|
750
|
|
|
751 -- Start of processing for Get_Line
|
|
|
752
|
|
|
753 begin
|
|
|
754 return Get_Rest ("");
|
|
|
755 end Get_Line;
|
|
|
756
|
|
|
757 function Get_Line return String is
|
|
|
758 begin
|
|
|
759 return Get_Line (Current_In);
|
|
|
760 end Get_Line;
|
|
|
761
|
|
|
762 -------------------------
|
|
|
763 -- Get_Upper_Half_Char --
|
|
|
764 -------------------------
|
|
|
765
|
|
|
766 function Get_Upper_Half_Char
|
|
|
767 (C : Character;
|
|
|
768 File : File_Type) return Character
|
|
|
769 is
|
|
|
770 Result : Wide_Character;
|
|
|
771
|
|
|
772 function In_Char return Character;
|
|
|
773 -- Function used to obtain additional characters it the wide character
|
|
|
774 -- sequence is more than one character long.
|
|
|
775
|
|
|
776 function WC_In is new Char_Sequence_To_Wide_Char (In_Char);
|
|
|
777
|
|
|
778 -------------
|
|
|
779 -- In_Char --
|
|
|
780 -------------
|
|
|
781
|
|
|
782 function In_Char return Character is
|
|
|
783 ch : constant Integer := Getc (File);
|
|
|
784 begin
|
|
|
785 if ch = EOF then
|
|
|
786 raise End_Error;
|
|
|
787 else
|
|
|
788 return Character'Val (ch);
|
|
|
789 end if;
|
|
|
790 end In_Char;
|
|
|
791
|
|
|
792 -- Start of processing for Get_Upper_Half_Char
|
|
|
793
|
|
|
794 begin
|
|
|
795 Result := WC_In (C, File.WC_Method);
|
|
|
796
|
|
|
797 if Wide_Character'Pos (Result) > 16#FF# then
|
|
|
798 raise Constraint_Error with
|
|
|
799 "invalid wide character in Text_'I'O input";
|
|
|
800 else
|
|
|
801 return Character'Val (Wide_Character'Pos (Result));
|
|
|
802 end if;
|
|
|
803 end Get_Upper_Half_Char;
|
|
|
804
|
|
|
805 -------------------------------
|
|
|
806 -- Get_Upper_Half_Char_Immed --
|
|
|
807 -------------------------------
|
|
|
808
|
|
|
809 function Get_Upper_Half_Char_Immed
|
|
|
810 (C : Character;
|
|
|
811 File : File_Type) return Character
|
|
|
812 is
|
|
|
813 Result : Wide_Character;
|
|
|
814
|
|
|
815 function In_Char return Character;
|
|
|
816 -- Function used to obtain additional characters it the wide character
|
|
|
817 -- sequence is more than one character long.
|
|
|
818
|
|
|
819 function WC_In is new Char_Sequence_To_Wide_Char (In_Char);
|
|
|
820
|
|
|
821 -------------
|
|
|
822 -- In_Char --
|
|
|
823 -------------
|
|
|
824
|
|
|
825 function In_Char return Character is
|
|
|
826 ch : constant Integer := Getc_Immed (File);
|
|
|
827 begin
|
|
|
828 if ch = EOF then
|
|
|
829 raise End_Error;
|
|
|
830 else
|
|
|
831 return Character'Val (ch);
|
|
|
832 end if;
|
|
|
833 end In_Char;
|
|
|
834
|
|
|
835 -- Start of processing for Get_Upper_Half_Char_Immed
|
|
|
836
|
|
|
837 begin
|
|
|
838 Result := WC_In (C, File.WC_Method);
|
|
|
839
|
|
|
840 if Wide_Character'Pos (Result) > 16#FF# then
|
|
|
841 raise Constraint_Error with
|
|
|
842 "invalid wide character in Text_'I'O input";
|
|
|
843 else
|
|
|
844 return Character'Val (Wide_Character'Pos (Result));
|
|
|
845 end if;
|
|
|
846 end Get_Upper_Half_Char_Immed;
|
|
|
847
|
|
|
848 ----------
|
|
|
849 -- Getc --
|
|
|
850 ----------
|
|
|
851
|
|
|
852 function Getc (File : File_Type) return int is
|
|
|
853 ch : int;
|
|
|
854
|
|
|
855 begin
|
|
|
856 ch := fgetc (File.Stream);
|
|
|
857
|
|
|
858 if ch = EOF and then ferror (File.Stream) /= 0 then
|
|
|
859 raise Device_Error;
|
|
|
860 else
|
|
|
861 return ch;
|
|
|
862 end if;
|
|
|
863 end Getc;
|
|
|
864
|
|
|
865 ----------------
|
|
|
866 -- Getc_Immed --
|
|
|
867 ----------------
|
|
|
868
|
|
|
869 function Getc_Immed (File : File_Type) return int is
|
|
|
870 ch : int;
|
|
|
871 end_of_file : int;
|
|
|
872
|
|
|
873 procedure getc_immediate
|
|
|
874 (stream : FILEs; ch : out int; end_of_file : out int);
|
|
|
875 pragma Import (C, getc_immediate, "getc_immediate");
|
|
|
876
|
|
|
877 begin
|
|
|
878 FIO.Check_Read_Status (AP (File));
|
|
|
879
|
|
|
880 if File.Before_LM then
|
|
|
881 File.Before_LM := False;
|
|
|
882 File.Before_LM_PM := False;
|
|
|
883 ch := LM;
|
|
|
884
|
|
|
885 else
|
|
|
886 getc_immediate (File.Stream, ch, end_of_file);
|
|
|
887
|
|
|
888 if ferror (File.Stream) /= 0 then
|
|
|
889 raise Device_Error;
|
|
|
890 elsif end_of_file /= 0 then
|
|
|
891 return EOF;
|
|
|
892 end if;
|
|
|
893 end if;
|
|
|
894
|
|
|
895 return ch;
|
|
|
896 end Getc_Immed;
|
|
|
897
|
|
|
898 ------------------------------
|
|
|
899 -- Has_Upper_Half_Character --
|
|
|
900 ------------------------------
|
|
|
901
|
|
|
902 function Has_Upper_Half_Character (Item : String) return Boolean is
|
|
|
903 begin
|
|
|
904 for J in Item'Range loop
|
|
|
905 if Character'Pos (Item (J)) >= 16#80# then
|
|
|
906 return True;
|
|
|
907 end if;
|
|
|
908 end loop;
|
|
|
909
|
|
|
910 return False;
|
|
|
911 end Has_Upper_Half_Character;
|
|
|
912
|
|
|
913 -------------------------------
|
|
|
914 -- Initialize_Standard_Files --
|
|
|
915 -------------------------------
|
|
|
916
|
|
|
917 procedure Initialize_Standard_Files is
|
|
|
918 begin
|
|
|
919 Standard_Err.Stream := stderr;
|
|
|
920 Standard_Err.Name := Err_Name'Access;
|
|
|
921 Standard_Err.Form := Null_Str'Unrestricted_Access;
|
|
|
922 Standard_Err.Mode := FCB.Out_File;
|
|
|
923 Standard_Err.Is_Regular_File := is_regular_file (fileno (stderr)) /= 0;
|
|
|
924 Standard_Err.Is_Temporary_File := False;
|
|
|
925 Standard_Err.Is_System_File := True;
|
|
|
926 Standard_Err.Text_Encoding := Default_Text;
|
|
|
927 Standard_Err.Access_Method := 'T';
|
|
|
928 Standard_Err.Self := Standard_Err;
|
|
|
929 Standard_Err.WC_Method := Default_WCEM;
|
|
|
930
|
|
|
931 Standard_In.Stream := stdin;
|
|
|
932 Standard_In.Name := In_Name'Access;
|
|
|
933 Standard_In.Form := Null_Str'Unrestricted_Access;
|
|
|
934 Standard_In.Mode := FCB.In_File;
|
|
|
935 Standard_In.Is_Regular_File := is_regular_file (fileno (stdin)) /= 0;
|
|
|
936 Standard_In.Is_Temporary_File := False;
|
|
|
937 Standard_In.Is_System_File := True;
|
|
|
938 Standard_In.Text_Encoding := Default_Text;
|
|
|
939 Standard_In.Access_Method := 'T';
|
|
|
940 Standard_In.Self := Standard_In;
|
|
|
941 Standard_In.WC_Method := Default_WCEM;
|
|
|
942
|
|
|
943 Standard_Out.Stream := stdout;
|
|
|
944 Standard_Out.Name := Out_Name'Access;
|
|
|
945 Standard_Out.Form := Null_Str'Unrestricted_Access;
|
|
|
946 Standard_Out.Mode := FCB.Out_File;
|
|
|
947 Standard_Out.Is_Regular_File := is_regular_file (fileno (stdout)) /= 0;
|
|
|
948 Standard_Out.Is_Temporary_File := False;
|
|
|
949 Standard_Out.Is_System_File := True;
|
|
|
950 Standard_Out.Text_Encoding := Default_Text;
|
|
|
951 Standard_Out.Access_Method := 'T';
|
|
|
952 Standard_Out.Self := Standard_Out;
|
|
|
953 Standard_Out.WC_Method := Default_WCEM;
|
|
|
954
|
|
|
955 FIO.Make_Unbuffered (AP (Standard_Out));
|
|
|
956 FIO.Make_Unbuffered (AP (Standard_Err));
|
|
|
957 end Initialize_Standard_Files;
|
|
|
958
|
|
|
959 -------------
|
|
|
960 -- Is_Open --
|
|
|
961 -------------
|
|
|
962
|
|
|
963 function Is_Open (File : File_Type) return Boolean is
|
|
|
964 begin
|
|
|
965 return FIO.Is_Open (AP (File));
|
|
|
966 end Is_Open;
|
|
|
967
|
|
|
968 ----------
|
|
|
969 -- Line --
|
|
|
970 ----------
|
|
|
971
|
|
|
972 -- Note: we assume that it is impossible in practice for the line
|
|
|
973 -- to exceed the value of Count'Last, i.e. no check is required for
|
|
|
974 -- overflow raising layout error.
|
|
|
975
|
|
|
976 function Line (File : File_Type) return Positive_Count is
|
|
|
977 begin
|
|
|
978 FIO.Check_File_Open (AP (File));
|
|
|
979 return File.Line;
|
|
|
980 end Line;
|
|
|
981
|
|
|
982 function Line return Positive_Count is
|
|
|
983 begin
|
|
|
984 return Line (Current_Out);
|
|
|
985 end Line;
|
|
|
986
|
|
|
987 -----------------
|
|
|
988 -- Line_Length --
|
|
|
989 -----------------
|
|
|
990
|
|
|
991 function Line_Length (File : File_Type) return Count is
|
|
|
992 begin
|
|
|
993 FIO.Check_Write_Status (AP (File));
|
|
|
994 return File.Line_Length;
|
|
|
995 end Line_Length;
|
|
|
996
|
|
|
997 function Line_Length return Count is
|
|
|
998 begin
|
|
|
999 return Line_Length (Current_Out);
|
|
|
1000 end Line_Length;
|
|
|
1001
|
|
|
1002 ----------------
|
|
|
1003 -- Look_Ahead --
|
|
|
1004 ----------------
|
|
|
1005
|
|
|
1006 procedure Look_Ahead
|
|
|
1007 (File : File_Type;
|
|
|
1008 Item : out Character;
|
|
|
1009 End_Of_Line : out Boolean)
|
|
|
1010 is
|
|
|
1011 ch : int;
|
|
|
1012
|
|
|
1013 begin
|
|
|
1014 FIO.Check_Read_Status (AP (File));
|
|
|
1015
|
|
|
1016 -- If we are logically before a line mark, we can return immediately
|
|
|
1017
|
|
|
1018 if File.Before_LM then
|
|
|
1019 End_Of_Line := True;
|
|
|
1020 Item := ASCII.NUL;
|
|
|
1021
|
|
|
1022 -- If we are before an upper half character just return it (this can
|
|
|
1023 -- happen if there are two calls to Look_Ahead in a row).
|
|
|
1024
|
|
|
1025 elsif File.Before_Upper_Half_Character then
|
|
|
1026 End_Of_Line := False;
|
|
|
1027 Item := File.Saved_Upper_Half_Character;
|
|
|
1028
|
|
|
1029 -- Otherwise we must read a character from the input stream
|
|
|
1030
|
|
|
1031 else
|
|
|
1032 ch := Getc (File);
|
|
|
1033
|
|
|
1034 if ch = LM
|
|
|
1035 or else ch = EOF
|
|
|
1036 or else (ch = PM and then File.Is_Regular_File)
|
|
|
1037 then
|
|
|
1038 End_Of_Line := True;
|
|
|
1039 Ungetc (ch, File);
|
|
|
1040 Item := ASCII.NUL;
|
|
|
1041
|
|
|
1042 -- Case where character obtained does not represent the start of an
|
|
|
1043 -- encoded sequence so it stands for itself and we can unget it with
|
|
|
1044 -- no difficulty.
|
|
|
1045
|
|
|
1046 elsif not Is_Start_Of_Encoding
|
|
|
1047 (Character'Val (ch), File.WC_Method)
|
|
|
1048 then
|
|
|
1049 End_Of_Line := False;
|
|
|
1050 Ungetc (ch, File);
|
|
|
1051 Item := Character'Val (ch);
|
|
|
1052
|
|
|
1053 -- For the start of an encoding, we read the character using the
|
|
|
1054 -- Get_Upper_Half_Char routine. It will occupy more than one byte
|
|
|
1055 -- so we can't put it back with ungetc. Instead we save it in the
|
|
|
1056 -- control block, setting a flag that everyone interested in reading
|
|
|
1057 -- characters must test before reading the stream.
|
|
|
1058
|
|
|
1059 else
|
|
|
1060 Item := Get_Upper_Half_Char (Character'Val (ch), File);
|
|
|
1061 End_Of_Line := False;
|
|
|
1062 File.Saved_Upper_Half_Character := Item;
|
|
|
1063 File.Before_Upper_Half_Character := True;
|
|
|
1064 end if;
|
|
|
1065 end if;
|
|
|
1066 end Look_Ahead;
|
|
|
1067
|
|
|
1068 procedure Look_Ahead
|
|
|
1069 (Item : out Character;
|
|
|
1070 End_Of_Line : out Boolean)
|
|
|
1071 is
|
|
|
1072 begin
|
|
|
1073 Look_Ahead (Current_In, Item, End_Of_Line);
|
|
|
1074 end Look_Ahead;
|
|
|
1075
|
|
|
1076 ----------
|
|
|
1077 -- Mode --
|
|
|
1078 ----------
|
|
|
1079
|
|
|
1080 function Mode (File : File_Type) return File_Mode is
|
|
|
1081 begin
|
|
|
1082 return To_TIO (FIO.Mode (AP (File)));
|
|
|
1083 end Mode;
|
|
|
1084
|
|
|
1085 ----------
|
|
|
1086 -- Name --
|
|
|
1087 ----------
|
|
|
1088
|
|
|
1089 function Name (File : File_Type) return String is
|
|
|
1090 begin
|
|
|
1091 return FIO.Name (AP (File));
|
|
|
1092 end Name;
|
|
|
1093
|
|
|
1094 --------------
|
|
|
1095 -- New_Line --
|
|
|
1096 --------------
|
|
|
1097
|
|
|
1098 procedure New_Line
|
|
|
1099 (File : File_Type;
|
|
|
1100 Spacing : Positive_Count := 1)
|
|
|
1101 is
|
|
|
1102 begin
|
|
|
1103 -- Raise Constraint_Error if out of range value. The reason for this
|
|
|
1104 -- explicit test is that we don't want junk values around, even if
|
|
|
1105 -- checks are off in the caller.
|
|
|
1106
|
|
|
1107 if not Spacing'Valid then
|
|
|
1108 raise Constraint_Error;
|
|
|
1109 end if;
|
|
|
1110
|
|
|
1111 FIO.Check_Write_Status (AP (File));
|
|
|
1112
|
|
|
1113 for K in 1 .. Spacing loop
|
|
|
1114 Putc (LM, File);
|
|
|
1115 File.Line := File.Line + 1;
|
|
|
1116
|
|
|
1117 if File.Page_Length /= 0
|
|
|
1118 and then File.Line > File.Page_Length
|
|
|
1119 then
|
|
|
1120 Putc (PM, File);
|
|
|
1121 File.Line := 1;
|
|
|
1122 File.Page := File.Page + 1;
|
|
|
1123 end if;
|
|
|
1124 end loop;
|
|
|
1125
|
|
|
1126 File.Col := 1;
|
|
|
1127 end New_Line;
|
|
|
1128
|
|
|
1129 procedure New_Line (Spacing : Positive_Count := 1) is
|
|
|
1130 begin
|
|
|
1131 New_Line (Current_Out, Spacing);
|
|
|
1132 end New_Line;
|
|
|
1133
|
|
|
1134 --------------
|
|
|
1135 -- New_Page --
|
|
|
1136 --------------
|
|
|
1137
|
|
|
1138 procedure New_Page (File : File_Type) is
|
|
|
1139 begin
|
|
|
1140 FIO.Check_Write_Status (AP (File));
|
|
|
1141
|
|
|
1142 if File.Col /= 1 or else File.Line = 1 then
|
|
|
1143 Putc (LM, File);
|
|
|
1144 end if;
|
|
|
1145
|
|
|
1146 Putc (PM, File);
|
|
|
1147 File.Page := File.Page + 1;
|
|
|
1148 File.Line := 1;
|
|
|
1149 File.Col := 1;
|
|
|
1150 end New_Page;
|
|
|
1151
|
|
|
1152 procedure New_Page is
|
|
|
1153 begin
|
|
|
1154 New_Page (Current_Out);
|
|
|
1155 end New_Page;
|
|
|
1156
|
|
|
1157 -----------
|
|
|
1158 -- Nextc --
|
|
|
1159 -----------
|
|
|
1160
|
|
|
1161 function Nextc (File : File_Type) return int is
|
|
|
1162 ch : int;
|
|
|
1163
|
|
|
1164 begin
|
|
|
1165 ch := fgetc (File.Stream);
|
|
|
1166
|
|
|
1167 if ch = EOF then
|
|
|
1168 if ferror (File.Stream) /= 0 then
|
|
|
1169 raise Device_Error;
|
|
|
1170 end if;
|
|
|
1171
|
|
|
1172 else
|
|
|
1173 if ungetc (ch, File.Stream) = EOF then
|
|
|
1174 raise Device_Error;
|
|
|
1175 end if;
|
|
|
1176 end if;
|
|
|
1177
|
|
|
1178 return ch;
|
|
|
1179 end Nextc;
|
|
|
1180
|
|
|
1181 ----------
|
|
|
1182 -- Open --
|
|
|
1183 ----------
|
|
|
1184
|
|
|
1185 procedure Open
|
|
|
1186 (File : in out File_Type;
|
|
|
1187 Mode : File_Mode;
|
|
|
1188 Name : String;
|
|
|
1189 Form : String := "")
|
|
|
1190 is
|
|
|
1191 Dummy_File_Control_Block : Text_AFCB;
|
|
|
1192 pragma Warnings (Off, Dummy_File_Control_Block);
|
|
|
1193 -- Yes, we know this is never assigned a value, only the tag
|
|
|
1194 -- is used for dispatching purposes, so that's expected.
|
|
|
1195
|
|
|
1196 begin
|
|
|
1197 FIO.Open (File_Ptr => AP (File),
|
|
|
1198 Dummy_FCB => Dummy_File_Control_Block,
|
|
|
1199 Mode => To_FCB (Mode),
|
|
|
1200 Name => Name,
|
|
|
1201 Form => Form,
|
|
|
1202 Amethod => 'T',
|
|
|
1203 Creat => False,
|
|
|
1204 Text => True);
|
|
|
1205
|
|
|
1206 File.Self := File;
|
|
|
1207 Set_WCEM (File);
|
|
|
1208 end Open;
|
|
|
1209
|
|
|
1210 ----------
|
|
|
1211 -- Page --
|
|
|
1212 ----------
|
|
|
1213
|
|
|
1214 -- Note: we assume that it is impossible in practice for the page
|
|
|
1215 -- to exceed the value of Count'Last, i.e. no check is required for
|
|
|
1216 -- overflow raising layout error.
|
|
|
1217
|
|
|
1218 function Page (File : File_Type) return Positive_Count is
|
|
|
1219 begin
|
|
|
1220 FIO.Check_File_Open (AP (File));
|
|
|
1221 return File.Page;
|
|
|
1222 end Page;
|
|
|
1223
|
|
|
1224 function Page return Positive_Count is
|
|
|
1225 begin
|
|
|
1226 return Page (Current_Out);
|
|
|
1227 end Page;
|
|
|
1228
|
|
|
1229 -----------------
|
|
|
1230 -- Page_Length --
|
|
|
1231 -----------------
|
|
|
1232
|
|
|
1233 function Page_Length (File : File_Type) return Count is
|
|
|
1234 begin
|
|
|
1235 FIO.Check_Write_Status (AP (File));
|
|
|
1236 return File.Page_Length;
|
|
|
1237 end Page_Length;
|
|
|
1238
|
|
|
1239 function Page_Length return Count is
|
|
|
1240 begin
|
|
|
1241 return Page_Length (Current_Out);
|
|
|
1242 end Page_Length;
|
|
|
1243
|
|
|
1244 ---------
|
|
|
1245 -- Put --
|
|
|
1246 ---------
|
|
|
1247
|
|
|
1248 procedure Put
|
|
|
1249 (File : File_Type;
|
|
|
1250 Item : Character)
|
|
|
1251 is
|
|
|
1252 begin
|
|
|
1253 FIO.Check_Write_Status (AP (File));
|
|
|
1254
|
|
|
1255 if File.Line_Length /= 0 and then File.Col > File.Line_Length then
|
|
|
1256 New_Line (File);
|
|
|
1257 end if;
|
|
|
1258
|
|
|
1259 -- If lower half character, or brackets encoding, output directly
|
|
|
1260
|
|
|
1261 if Character'Pos (Item) < 16#80#
|
|
|
1262 or else File.WC_Method = WCEM_Brackets
|
|
|
1263 then
|
|
|
1264 if fputc (Character'Pos (Item), File.Stream) = EOF then
|
|
|
1265 raise Device_Error;
|
|
|
1266 end if;
|
|
|
1267
|
|
|
1268 -- Case of upper half character with non-brackets encoding
|
|
|
1269
|
|
|
1270 else
|
|
|
1271 Put_Encoded (File, Item);
|
|
|
1272 end if;
|
|
|
1273
|
|
|
1274 File.Col := File.Col + 1;
|
|
|
1275 end Put;
|
|
|
1276
|
|
|
1277 procedure Put (Item : Character) is
|
|
|
1278 begin
|
|
|
1279 Put (Current_Out, Item);
|
|
|
1280 end Put;
|
|
|
1281
|
|
|
1282 ---------
|
|
|
1283 -- Put --
|
|
|
1284 ---------
|
|
|
1285
|
|
|
1286 procedure Put
|
|
|
1287 (File : File_Type;
|
|
|
1288 Item : String)
|
|
|
1289 is
|
|
|
1290 begin
|
|
|
1291 FIO.Check_Write_Status (AP (File));
|
|
|
1292
|
|
|
1293 -- Only have something to do if string is non-null
|
|
|
1294
|
|
|
1295 if Item'Length > 0 then
|
|
|
1296
|
|
|
1297 -- If we have bounded lines, or if the file encoding is other than
|
|
|
1298 -- Brackets and the string has at least one upper half character,
|
|
|
1299 -- then output the string character by character.
|
|
|
1300
|
|
|
1301 if File.Line_Length /= 0
|
|
|
1302 or else (File.WC_Method /= WCEM_Brackets
|
|
|
1303 and then Has_Upper_Half_Character (Item))
|
|
|
1304 then
|
|
|
1305 for J in Item'Range loop
|
|
|
1306 Put (File, Item (J));
|
|
|
1307 end loop;
|
|
|
1308
|
|
|
1309 -- Otherwise we can output the entire string at once. Note that if
|
|
|
1310 -- there are LF or FF characters in the string, we do not bother to
|
|
|
1311 -- count them as line or page terminators.
|
|
|
1312
|
|
|
1313 else
|
|
|
1314 FIO.Write_Buf (AP (File), Item'Address, Item'Length);
|
|
|
1315 File.Col := File.Col + Item'Length;
|
|
|
1316 end if;
|
|
|
1317 end if;
|
|
|
1318 end Put;
|
|
|
1319
|
|
|
1320 procedure Put (Item : String) is
|
|
|
1321 begin
|
|
|
1322 Put (Current_Out, Item);
|
|
|
1323 end Put;
|
|
|
1324
|
|
|
1325 -----------------
|
|
|
1326 -- Put_Encoded --
|
|
|
1327 -----------------
|
|
|
1328
|
|
|
1329 procedure Put_Encoded (File : File_Type; Char : Character) is
|
|
|
1330 procedure Out_Char (C : Character);
|
|
|
1331 -- Procedure to output one character of an upper half encoded sequence
|
|
|
1332
|
|
|
1333 procedure WC_Out is new Wide_Char_To_Char_Sequence (Out_Char);
|
|
|
1334
|
|
|
1335 --------------
|
|
|
1336 -- Out_Char --
|
|
|
1337 --------------
|
|
|
1338
|
|
|
1339 procedure Out_Char (C : Character) is
|
|
|
1340 begin
|
|
|
1341 Putc (Character'Pos (C), File);
|
|
|
1342 end Out_Char;
|
|
|
1343
|
|
|
1344 -- Start of processing for Put_Encoded
|
|
|
1345
|
|
|
1346 begin
|
|
|
1347 WC_Out (Wide_Character'Val (Character'Pos (Char)), File.WC_Method);
|
|
|
1348 end Put_Encoded;
|
|
|
1349
|
|
|
1350 --------------
|
|
|
1351 -- Put_Line --
|
|
|
1352 --------------
|
|
|
1353
|
|
|
1354 procedure Put_Line
|
|
|
1355 (File : File_Type;
|
|
|
1356 Item : String)
|
|
|
1357 is
|
|
|
1358 Ilen : Natural := Item'Length;
|
|
|
1359 Istart : Natural := Item'First;
|
|
|
1360
|
|
|
1361 begin
|
|
|
1362 FIO.Check_Write_Status (AP (File));
|
|
|
1363
|
|
|
1364 -- If we have bounded lines, or if the file encoding is other than
|
|
|
1365 -- Brackets and the string has at least one upper half character, then
|
|
|
1366 -- output the string character by character.
|
|
|
1367
|
|
|
1368 if File.Line_Length /= 0
|
|
|
1369 or else (File.WC_Method /= WCEM_Brackets
|
|
|
1370 and then Has_Upper_Half_Character (Item))
|
|
|
1371 then
|
|
|
1372 for J in Item'Range loop
|
|
|
1373 Put (File, Item (J));
|
|
|
1374 end loop;
|
|
|
1375
|
|
|
1376 New_Line (File);
|
|
|
1377 return;
|
|
|
1378 end if;
|
|
|
1379
|
|
|
1380 -- Normal case where we do not need to output character by character
|
|
|
1381
|
|
|
1382 -- We setup a single string that has the necessary terminators and
|
|
|
1383 -- then write it with a single call. The reason for doing this is
|
|
|
1384 -- that it gives better behavior for the use of Put_Line in multi-
|
|
|
1385 -- tasking programs, since often the OS will treat the entire put
|
|
|
1386 -- operation as an atomic operation.
|
|
|
1387
|
|
|
1388 -- We only do this if the message is 512 characters or less in length,
|
|
|
1389 -- since otherwise Put_Line would use an unbounded amount of stack
|
|
|
1390 -- space and could cause undetected stack overflow. If we have a
|
|
|
1391 -- longer string, then output the first part separately to avoid this.
|
|
|
1392
|
|
|
1393 if Ilen > 512 then
|
|
|
1394 FIO.Write_Buf (AP (File), Item'Address, size_t (Ilen - 512));
|
|
|
1395 Istart := Istart + Ilen - 512;
|
|
|
1396 Ilen := 512;
|
|
|
1397 end if;
|
|
|
1398
|
|
|
1399 -- Now prepare the string with its terminator
|
|
|
1400
|
|
|
1401 declare
|
|
|
1402 Buffer : String (1 .. Ilen + 2);
|
|
|
1403 Plen : size_t;
|
|
|
1404
|
|
|
1405 begin
|
|
|
1406 Buffer (1 .. Ilen) := Item (Istart .. Item'Last);
|
|
|
1407 Buffer (Ilen + 1) := Character'Val (LM);
|
|
|
1408
|
|
|
1409 if File.Page_Length /= 0
|
|
|
1410 and then File.Line > File.Page_Length
|
|
|
1411 then
|
|
|
1412 Buffer (Ilen + 2) := Character'Val (PM);
|
|
|
1413 Plen := size_t (Ilen) + 2;
|
|
|
1414 File.Line := 1;
|
|
|
1415 File.Page := File.Page + 1;
|
|
|
1416
|
|
|
1417 else
|
|
|
1418 Plen := size_t (Ilen) + 1;
|
|
|
1419 File.Line := File.Line + 1;
|
|
|
1420 end if;
|
|
|
1421
|
|
|
1422 FIO.Write_Buf (AP (File), Buffer'Address, Plen);
|
|
|
1423
|
|
|
1424 File.Col := 1;
|
|
|
1425 end;
|
|
|
1426 end Put_Line;
|
|
|
1427
|
|
|
1428 procedure Put_Line (Item : String) is
|
|
|
1429 begin
|
|
|
1430 Put_Line (Current_Out, Item);
|
|
|
1431 end Put_Line;
|
|
|
1432
|
|
|
1433 ----------
|
|
|
1434 -- Putc --
|
|
|
1435 ----------
|
|
|
1436
|
|
|
1437 procedure Putc (ch : int; File : File_Type) is
|
|
|
1438 begin
|
|
|
1439 if fputc (ch, File.Stream) = EOF then
|
|
|
1440 raise Device_Error;
|
|
|
1441 end if;
|
|
|
1442 end Putc;
|
|
|
1443
|
|
|
1444 ----------
|
|
|
1445 -- Read --
|
|
|
1446 ----------
|
|
|
1447
|
|
|
1448 -- This is the primitive Stream Read routine, used when a Text_IO file
|
|
|
1449 -- is treated directly as a stream using Text_IO.Streams.Stream.
|
|
|
1450
|
|
|
1451 procedure Read
|
|
|
1452 (File : in out Text_AFCB;
|
|
|
1453 Item : out Stream_Element_Array;
|
|
|
1454 Last : out Stream_Element_Offset)
|
|
|
1455 is
|
|
|
1456 Discard_ch : int;
|
|
|
1457 pragma Warnings (Off, Discard_ch);
|
|
|
1458
|
|
|
1459 begin
|
|
|
1460 -- Need to deal with Before_Upper_Half_Character ???
|
|
|
1461
|
|
|
1462 if File.Mode /= FCB.In_File then
|
|
|
1463 raise Mode_Error;
|
|
|
1464 end if;
|
|
|
1465
|
|
|
1466 -- Deal with case where our logical and physical position do not match
|
|
|
1467 -- because of being after an LM or LM-PM sequence when in fact we are
|
|
|
1468 -- logically positioned before it.
|
|
|
1469
|
|
|
1470 if File.Before_LM then
|
|
|
1471
|
|
|
1472 -- If we are before a PM, then it is possible for a stream read
|
|
|
1473 -- to leave us after the LM and before the PM, which is a bit
|
|
|
1474 -- odd. The easiest way to deal with this is to unget the PM,
|
|
|
1475 -- so we are indeed positioned between the characters. This way
|
|
|
1476 -- further stream read operations will work correctly, and the
|
|
|
1477 -- effect on text processing is a little weird, but what can
|
|
|
1478 -- be expected if stream and text input are mixed this way?
|
|
|
1479
|
|
|
1480 if File.Before_LM_PM then
|
|
|
1481 Discard_ch := ungetc (PM, File.Stream);
|
|
|
1482 File.Before_LM_PM := False;
|
|
|
1483 end if;
|
|
|
1484
|
|
|
1485 File.Before_LM := False;
|
|
|
1486
|
|
|
1487 Item (Item'First) := Stream_Element (Character'Pos (ASCII.LF));
|
|
|
1488
|
|
|
1489 if Item'Length = 1 then
|
|
|
1490 Last := Item'Last;
|
|
|
1491
|
|
|
1492 else
|
|
|
1493 Last :=
|
|
|
1494 Item'First +
|
|
|
1495 Stream_Element_Offset
|
|
|
1496 (fread (buffer => Item'Address,
|
|
|
1497 index => size_t (Item'First + 1),
|
|
|
1498 size => 1,
|
|
|
1499 count => Item'Length - 1,
|
|
|
1500 stream => File.Stream));
|
|
|
1501 end if;
|
|
|
1502
|
|
|
1503 return;
|
|
|
1504 end if;
|
|
|
1505
|
|
|
1506 -- Now we do the read. Since this is a text file, it is normally in
|
|
|
1507 -- text mode, but stream data must be read in binary mode, so we
|
|
|
1508 -- temporarily set binary mode for the read, resetting it after.
|
|
|
1509 -- These calls have no effect in a system (like Unix) where there is
|
|
|
1510 -- no distinction between text and binary files.
|
|
|
1511
|
|
|
1512 set_binary_mode (fileno (File.Stream));
|
|
|
1513
|
|
|
1514 Last :=
|
|
|
1515 Item'First +
|
|
|
1516 Stream_Element_Offset
|
|
|
1517 (fread (Item'Address, 1, Item'Length, File.Stream)) - 1;
|
|
|
1518
|
|
|
1519 if Last < Item'Last then
|
|
|
1520 if ferror (File.Stream) /= 0 then
|
|
|
1521 raise Device_Error;
|
|
|
1522 end if;
|
|
|
1523 end if;
|
|
|
1524
|
|
|
1525 set_text_mode (fileno (File.Stream));
|
|
|
1526 end Read;
|
|
|
1527
|
|
|
1528 -----------
|
|
|
1529 -- Reset --
|
|
|
1530 -----------
|
|
|
1531
|
|
|
1532 procedure Reset
|
|
|
1533 (File : in out File_Type;
|
|
|
1534 Mode : File_Mode)
|
|
|
1535 is
|
|
|
1536 begin
|
|
|
1537 -- Don't allow change of mode for current file (RM A.10.2(5))
|
|
|
1538
|
|
|
1539 if (File = Current_In or else
|
|
|
1540 File = Current_Out or else
|
|
|
1541 File = Current_Error)
|
|
|
1542 and then To_FCB (Mode) /= File.Mode
|
|
|
1543 then
|
|
|
1544 raise Mode_Error;
|
|
|
1545 end if;
|
|
|
1546
|
|
|
1547 Terminate_Line (File);
|
|
|
1548 FIO.Reset (AP (File)'Unrestricted_Access, To_FCB (Mode));
|
|
|
1549 File.Page := 1;
|
|
|
1550 File.Line := 1;
|
|
|
1551 File.Col := 1;
|
|
|
1552 File.Line_Length := 0;
|
|
|
1553 File.Page_Length := 0;
|
|
|
1554 File.Before_LM := False;
|
|
|
1555 File.Before_LM_PM := False;
|
|
|
1556 end Reset;
|
|
|
1557
|
|
|
1558 procedure Reset (File : in out File_Type) is
|
|
|
1559 begin
|
|
|
1560 Terminate_Line (File);
|
|
|
1561 FIO.Reset (AP (File)'Unrestricted_Access);
|
|
|
1562 File.Page := 1;
|
|
|
1563 File.Line := 1;
|
|
|
1564 File.Col := 1;
|
|
|
1565 File.Line_Length := 0;
|
|
|
1566 File.Page_Length := 0;
|
|
|
1567 File.Before_LM := False;
|
|
|
1568 File.Before_LM_PM := False;
|
|
|
1569 end Reset;
|
|
|
1570
|
|
|
1571 -------------
|
|
|
1572 -- Set_Col --
|
|
|
1573 -------------
|
|
|
1574
|
|
|
1575 procedure Set_Col
|
|
|
1576 (File : File_Type;
|
|
|
1577 To : Positive_Count)
|
|
|
1578 is
|
|
|
1579 ch : int;
|
|
|
1580
|
|
|
1581 begin
|
|
|
1582 -- Raise Constraint_Error if out of range value. The reason for this
|
|
|
1583 -- explicit test is that we don't want junk values around, even if
|
|
|
1584 -- checks are off in the caller.
|
|
|
1585
|
|
|
1586 if not To'Valid then
|
|
|
1587 raise Constraint_Error;
|
|
|
1588 end if;
|
|
|
1589
|
|
|
1590 FIO.Check_File_Open (AP (File));
|
|
|
1591
|
|
|
1592 -- Output case
|
|
|
1593
|
|
|
1594 if Mode (File) >= Out_File then
|
|
|
1595
|
|
|
1596 -- Error if we attempt to set Col to a value greater than the
|
|
|
1597 -- maximum permissible line length.
|
|
|
1598
|
|
|
1599 if File.Line_Length /= 0 and then To > File.Line_Length then
|
|
|
1600 raise Layout_Error;
|
|
|
1601 end if;
|
|
|
1602
|
|
|
1603 -- If we are behind current position, then go to start of new line
|
|
|
1604
|
|
|
1605 if To < File.Col then
|
|
|
1606 New_Line (File);
|
|
|
1607 end if;
|
|
|
1608
|
|
|
1609 -- Loop to output blanks till we are at the required column
|
|
|
1610
|
|
|
1611 while File.Col < To loop
|
|
|
1612 Put (File, ' ');
|
|
|
1613 end loop;
|
|
|
1614
|
|
|
1615 -- Input case
|
|
|
1616
|
|
|
1617 else
|
|
|
1618 -- If we are logically before a LM, but physically after it, the
|
|
|
1619 -- file position still reflects the position before the LM, so eat
|
|
|
1620 -- it now and adjust the file position appropriately.
|
|
|
1621
|
|
|
1622 if File.Before_LM then
|
|
|
1623 File.Before_LM := False;
|
|
|
1624 File.Before_LM_PM := False;
|
|
|
1625 File.Line := File.Line + 1;
|
|
|
1626 File.Col := 1;
|
|
|
1627 end if;
|
|
|
1628
|
|
|
1629 -- Loop reading characters till we get one at the required Col value
|
|
|
1630
|
|
|
1631 loop
|
|
|
1632 -- Read next character. The reason we have to read ahead is to
|
|
|
1633 -- skip formatting characters, the effect of Set_Col is to set
|
|
|
1634 -- us to a real character with the right Col value, and format
|
|
|
1635 -- characters don't count.
|
|
|
1636
|
|
|
1637 ch := Getc (File);
|
|
|
1638
|
|
|
1639 -- Error if we hit an end of file
|
|
|
1640
|
|
|
1641 if ch = EOF then
|
|
|
1642 raise End_Error;
|
|
|
1643
|
|
|
1644 -- If line mark, eat it and adjust file position
|
|
|
1645
|
|
|
1646 elsif ch = LM then
|
|
|
1647 File.Line := File.Line + 1;
|
|
|
1648 File.Col := 1;
|
|
|
1649
|
|
|
1650 -- If recognized page mark, eat it, and adjust file position
|
|
|
1651
|
|
|
1652 elsif ch = PM and then File.Is_Regular_File then
|
|
|
1653 File.Page := File.Page + 1;
|
|
|
1654 File.Line := 1;
|
|
|
1655 File.Col := 1;
|
|
|
1656
|
|
|
1657 -- Otherwise this is the character we are looking for, so put it
|
|
|
1658 -- back in the input stream (we have not adjusted the file
|
|
|
1659 -- position yet, so everything is set right after this ungetc).
|
|
|
1660
|
|
|
1661 elsif To = File.Col then
|
|
|
1662 Ungetc (ch, File);
|
|
|
1663 return;
|
|
|
1664
|
|
|
1665 -- Keep skipping characters if we are not there yet, updating the
|
|
|
1666 -- file position past the skipped character.
|
|
|
1667
|
|
|
1668 else
|
|
|
1669 File.Col := File.Col + 1;
|
|
|
1670 end if;
|
|
|
1671 end loop;
|
|
|
1672 end if;
|
|
|
1673 end Set_Col;
|
|
|
1674
|
|
|
1675 procedure Set_Col (To : Positive_Count) is
|
|
|
1676 begin
|
|
|
1677 Set_Col (Current_Out, To);
|
|
|
1678 end Set_Col;
|
|
|
1679
|
|
|
1680 ---------------
|
|
|
1681 -- Set_Error --
|
|
|
1682 ---------------
|
|
|
1683
|
|
|
1684 procedure Set_Error (File : File_Type) is
|
|
|
1685 begin
|
|
|
1686 FIO.Check_Write_Status (AP (File));
|
|
|
1687 Current_Err := File;
|
|
|
1688 end Set_Error;
|
|
|
1689
|
|
|
1690 ---------------
|
|
|
1691 -- Set_Input --
|
|
|
1692 ---------------
|
|
|
1693
|
|
|
1694 procedure Set_Input (File : File_Type) is
|
|
|
1695 begin
|
|
|
1696 FIO.Check_Read_Status (AP (File));
|
|
|
1697 Current_In := File;
|
|
|
1698 end Set_Input;
|
|
|
1699
|
|
|
1700 --------------
|
|
|
1701 -- Set_Line --
|
|
|
1702 --------------
|
|
|
1703
|
|
|
1704 procedure Set_Line
|
|
|
1705 (File : File_Type;
|
|
|
1706 To : Positive_Count)
|
|
|
1707 is
|
|
|
1708 begin
|
|
|
1709 -- Raise Constraint_Error if out of range value. The reason for this
|
|
|
1710 -- explicit test is that we don't want junk values around, even if
|
|
|
1711 -- checks are off in the caller.
|
|
|
1712
|
|
|
1713 if not To'Valid then
|
|
|
1714 raise Constraint_Error;
|
|
|
1715 end if;
|
|
|
1716
|
|
|
1717 FIO.Check_File_Open (AP (File));
|
|
|
1718
|
|
|
1719 if To = File.Line then
|
|
|
1720 return;
|
|
|
1721 end if;
|
|
|
1722
|
|
|
1723 if Mode (File) >= Out_File then
|
|
|
1724 if File.Page_Length /= 0 and then To > File.Page_Length then
|
|
|
1725 raise Layout_Error;
|
|
|
1726 end if;
|
|
|
1727
|
|
|
1728 if To < File.Line then
|
|
|
1729 New_Page (File);
|
|
|
1730 end if;
|
|
|
1731
|
|
|
1732 while File.Line < To loop
|
|
|
1733 New_Line (File);
|
|
|
1734 end loop;
|
|
|
1735
|
|
|
1736 else
|
|
|
1737 while To /= File.Line loop
|
|
|
1738 Skip_Line (File);
|
|
|
1739 end loop;
|
|
|
1740 end if;
|
|
|
1741 end Set_Line;
|
|
|
1742
|
|
|
1743 procedure Set_Line (To : Positive_Count) is
|
|
|
1744 begin
|
|
|
1745 Set_Line (Current_Out, To);
|
|
|
1746 end Set_Line;
|
|
|
1747
|
|
|
1748 ---------------------
|
|
|
1749 -- Set_Line_Length --
|
|
|
1750 ---------------------
|
|
|
1751
|
|
|
1752 procedure Set_Line_Length (File : File_Type; To : Count) is
|
|
|
1753 begin
|
|
|
1754 -- Raise Constraint_Error if out of range value. The reason for this
|
|
|
1755 -- explicit test is that we don't want junk values around, even if
|
|
|
1756 -- checks are off in the caller.
|
|
|
1757
|
|
|
1758 if not To'Valid then
|
|
|
1759 raise Constraint_Error;
|
|
|
1760 end if;
|
|
|
1761
|
|
|
1762 FIO.Check_Write_Status (AP (File));
|
|
|
1763 File.Line_Length := To;
|
|
|
1764 end Set_Line_Length;
|
|
|
1765
|
|
|
1766 procedure Set_Line_Length (To : Count) is
|
|
|
1767 begin
|
|
|
1768 Set_Line_Length (Current_Out, To);
|
|
|
1769 end Set_Line_Length;
|
|
|
1770
|
|
|
1771 ----------------
|
|
|
1772 -- Set_Output --
|
|
|
1773 ----------------
|
|
|
1774
|
|
|
1775 procedure Set_Output (File : File_Type) is
|
|
|
1776 begin
|
|
|
1777 FIO.Check_Write_Status (AP (File));
|
|
|
1778 Current_Out := File;
|
|
|
1779 end Set_Output;
|
|
|
1780
|
|
|
1781 ---------------------
|
|
|
1782 -- Set_Page_Length --
|
|
|
1783 ---------------------
|
|
|
1784
|
|
|
1785 procedure Set_Page_Length (File : File_Type; To : Count) is
|
|
|
1786 begin
|
|
|
1787 -- Raise Constraint_Error if out of range value. The reason for this
|
|
|
1788 -- explicit test is that we don't want junk values around, even if
|
|
|
1789 -- checks are off in the caller.
|
|
|
1790
|
|
|
1791 if not To'Valid then
|
|
|
1792 raise Constraint_Error;
|
|
|
1793 end if;
|
|
|
1794
|
|
|
1795 FIO.Check_Write_Status (AP (File));
|
|
|
1796 File.Page_Length := To;
|
|
|
1797 end Set_Page_Length;
|
|
|
1798
|
|
|
1799 procedure Set_Page_Length (To : Count) is
|
|
|
1800 begin
|
|
|
1801 Set_Page_Length (Current_Out, To);
|
|
|
1802 end Set_Page_Length;
|
|
|
1803
|
|
|
1804 --------------
|
|
|
1805 -- Set_WCEM --
|
|
|
1806 --------------
|
|
|
1807
|
|
|
1808 procedure Set_WCEM (File : in out File_Type) is
|
|
|
1809 Start : Natural;
|
|
|
1810 Stop : Natural;
|
|
|
1811
|
|
|
1812 begin
|
|
|
1813 FIO.Form_Parameter (File.Form.all, "wcem", Start, Stop);
|
|
|
1814
|
|
|
1815 if Start = 0 then
|
|
|
1816 File.WC_Method := Default_WCEM;
|
|
|
1817
|
|
|
1818 else
|
|
|
1819 if Stop = Start then
|
|
|
1820 for J in WC_Encoding_Letters'Range loop
|
|
|
1821 if File.Form (Start) = WC_Encoding_Letters (J) then
|
|
|
1822 File.WC_Method := J;
|
|
|
1823 return;
|
|
|
1824 end if;
|
|
|
1825 end loop;
|
|
|
1826 end if;
|
|
|
1827
|
|
|
1828 Close (File);
|
|
|
1829 raise Use_Error with "invalid WCEM form parameter";
|
|
|
1830 end if;
|
|
|
1831 end Set_WCEM;
|
|
|
1832
|
|
|
1833 ---------------
|
|
|
1834 -- Skip_Line --
|
|
|
1835 ---------------
|
|
|
1836
|
|
|
1837 procedure Skip_Line
|
|
|
1838 (File : File_Type;
|
|
|
1839 Spacing : Positive_Count := 1)
|
|
|
1840 is
|
|
|
1841 ch : int;
|
|
|
1842
|
|
|
1843 begin
|
|
|
1844 -- Raise Constraint_Error if out of range value. The reason for this
|
|
|
1845 -- explicit test is that we don't want junk values around, even if
|
|
|
1846 -- checks are off in the caller.
|
|
|
1847
|
|
|
1848 if not Spacing'Valid then
|
|
|
1849 raise Constraint_Error;
|
|
|
1850 end if;
|
|
|
1851
|
|
|
1852 FIO.Check_Read_Status (AP (File));
|
|
|
1853
|
|
|
1854 for L in 1 .. Spacing loop
|
|
|
1855 if File.Before_LM then
|
|
|
1856 File.Before_LM := False;
|
|
|
1857
|
|
|
1858 -- Note that if File.Before_LM_PM is currently set, we also have
|
|
|
1859 -- to reset it (because it makes sense for Before_LM_PM to be set
|
|
|
1860 -- only when Before_LM is also set). This is done later on in this
|
|
|
1861 -- subprogram, as soon as Before_LM_PM has been taken into account
|
|
|
1862 -- for the purpose of page and line counts.
|
|
|
1863
|
|
|
1864 else
|
|
|
1865 ch := Getc (File);
|
|
|
1866
|
|
|
1867 -- If at end of file now, then immediately raise End_Error. Note
|
|
|
1868 -- that we can never be positioned between a line mark and a page
|
|
|
1869 -- mark, so if we are at the end of file, we cannot logically be
|
|
|
1870 -- before the implicit page mark that is at the end of the file.
|
|
|
1871
|
|
|
1872 -- For the same reason, we do not need an explicit check for a
|
|
|
1873 -- page mark. If there is a FF in the middle of a line, the file
|
|
|
1874 -- is not in canonical format and we do not care about the page
|
|
|
1875 -- numbers for files other than ones in canonical format.
|
|
|
1876
|
|
|
1877 if ch = EOF then
|
|
|
1878 raise End_Error;
|
|
|
1879 end if;
|
|
|
1880
|
|
|
1881 -- If not at end of file, then loop till we get to an LM or EOF.
|
|
|
1882 -- The latter case happens only in non-canonical files where the
|
|
|
1883 -- last line is not terminated by LM, but we don't want to blow
|
|
|
1884 -- up for such files, so we assume an implicit LM in this case.
|
|
|
1885
|
|
|
1886 loop
|
|
|
1887 exit when ch = LM or else ch = EOF;
|
|
|
1888 ch := Getc (File);
|
|
|
1889 end loop;
|
|
|
1890 end if;
|
|
|
1891
|
|
|
1892 -- We have got past a line mark, now, for a regular file only,
|
|
|
1893 -- see if a page mark immediately follows this line mark and
|
|
|
1894 -- if so, skip past the page mark as well. We do not do this
|
|
|
1895 -- for non-regular files, since it would cause an undesirable
|
|
|
1896 -- wait for an additional character.
|
|
|
1897
|
|
|
1898 File.Col := 1;
|
|
|
1899 File.Line := File.Line + 1;
|
|
|
1900
|
|
|
1901 if File.Before_LM_PM then
|
|
|
1902 File.Page := File.Page + 1;
|
|
|
1903 File.Line := 1;
|
|
|
1904 File.Before_LM_PM := False;
|
|
|
1905
|
|
|
1906 elsif File.Is_Regular_File then
|
|
|
1907 ch := Getc (File);
|
|
|
1908
|
|
|
1909 -- Page mark can be explicit, or implied at the end of the file
|
|
|
1910
|
|
|
1911 if (ch = PM or else ch = EOF)
|
|
|
1912 and then File.Is_Regular_File
|
|
|
1913 then
|
|
|
1914 File.Page := File.Page + 1;
|
|
|
1915 File.Line := 1;
|
|
|
1916 else
|
|
|
1917 Ungetc (ch, File);
|
|
|
1918 end if;
|
|
|
1919 end if;
|
|
|
1920 end loop;
|
|
|
1921
|
|
|
1922 File.Before_Upper_Half_Character := False;
|
|
|
1923 end Skip_Line;
|
|
|
1924
|
|
|
1925 procedure Skip_Line (Spacing : Positive_Count := 1) is
|
|
|
1926 begin
|
|
|
1927 Skip_Line (Current_In, Spacing);
|
|
|
1928 end Skip_Line;
|
|
|
1929
|
|
|
1930 ---------------
|
|
|
1931 -- Skip_Page --
|
|
|
1932 ---------------
|
|
|
1933
|
|
|
1934 procedure Skip_Page (File : File_Type) is
|
|
|
1935 ch : int;
|
|
|
1936
|
|
|
1937 begin
|
|
|
1938 FIO.Check_Read_Status (AP (File));
|
|
|
1939
|
|
|
1940 -- If at page mark already, just skip it
|
|
|
1941
|
|
|
1942 if File.Before_LM_PM then
|
|
|
1943 File.Before_LM := False;
|
|
|
1944 File.Before_LM_PM := False;
|
|
|
1945 File.Page := File.Page + 1;
|
|
|
1946 File.Line := 1;
|
|
|
1947 File.Col := 1;
|
|
|
1948 return;
|
|
|
1949 end if;
|
|
|
1950
|
|
|
1951 -- This is a bit tricky, if we are logically before an LM then
|
|
|
1952 -- it is not an error if we are at an end of file now, since we
|
|
|
1953 -- are not really at it.
|
|
|
1954
|
|
|
1955 if File.Before_LM then
|
|
|
1956 File.Before_LM := False;
|
|
|
1957 File.Before_LM_PM := False;
|
|
|
1958 ch := Getc (File);
|
|
|
1959
|
|
|
1960 -- Otherwise we do raise End_Error if we are at the end of file now
|
|
|
1961
|
|
|
1962 else
|
|
|
1963 ch := Getc (File);
|
|
|
1964
|
|
|
1965 if ch = EOF then
|
|
|
1966 raise End_Error;
|
|
|
1967 end if;
|
|
|
1968 end if;
|
|
|
1969
|
|
|
1970 -- Now we can just rumble along to the next page mark, or to the
|
|
|
1971 -- end of file, if that comes first. The latter case happens when
|
|
|
1972 -- the page mark is implied at the end of file.
|
|
|
1973
|
|
|
1974 loop
|
|
|
1975 exit when ch = EOF
|
|
|
1976 or else (ch = PM and then File.Is_Regular_File);
|
|
|
1977 ch := Getc (File);
|
|
|
1978 end loop;
|
|
|
1979
|
|
|
1980 File.Page := File.Page + 1;
|
|
|
1981 File.Line := 1;
|
|
|
1982 File.Col := 1;
|
|
|
1983 File.Before_Upper_Half_Character := False;
|
|
|
1984 end Skip_Page;
|
|
|
1985
|
|
|
1986 procedure Skip_Page is
|
|
|
1987 begin
|
|
|
1988 Skip_Page (Current_In);
|
|
|
1989 end Skip_Page;
|
|
|
1990
|
|
|
1991 --------------------
|
|
|
1992 -- Standard_Error --
|
|
|
1993 --------------------
|
|
|
1994
|
|
|
1995 function Standard_Error return File_Type is
|
|
|
1996 begin
|
|
|
1997 return Standard_Err;
|
|
|
1998 end Standard_Error;
|
|
|
1999
|
|
|
2000 function Standard_Error return File_Access is
|
|
|
2001 begin
|
|
|
2002 return Standard_Err'Access;
|
|
|
2003 end Standard_Error;
|
|
|
2004
|
|
|
2005 --------------------
|
|
|
2006 -- Standard_Input --
|
|
|
2007 --------------------
|
|
|
2008
|
|
|
2009 function Standard_Input return File_Type is
|
|
|
2010 begin
|
|
|
2011 return Standard_In;
|
|
|
2012 end Standard_Input;
|
|
|
2013
|
|
|
2014 function Standard_Input return File_Access is
|
|
|
2015 begin
|
|
|
2016 return Standard_In'Access;
|
|
|
2017 end Standard_Input;
|
|
|
2018
|
|
|
2019 ---------------------
|
|
|
2020 -- Standard_Output --
|
|
|
2021 ---------------------
|
|
|
2022
|
|
|
2023 function Standard_Output return File_Type is
|
|
|
2024 begin
|
|
|
2025 return Standard_Out;
|
|
|
2026 end Standard_Output;
|
|
|
2027
|
|
|
2028 function Standard_Output return File_Access is
|
|
|
2029 begin
|
|
|
2030 return Standard_Out'Access;
|
|
|
2031 end Standard_Output;
|
|
|
2032
|
|
|
2033 --------------------
|
|
|
2034 -- Terminate_Line --
|
|
|
2035 --------------------
|
|
|
2036
|
|
|
2037 procedure Terminate_Line (File : File_Type) is
|
|
|
2038 begin
|
|
|
2039 FIO.Check_File_Open (AP (File));
|
|
|
2040
|
|
|
2041 -- For file other than In_File, test for needing to terminate last line
|
|
|
2042
|
|
|
2043 if Mode (File) /= In_File then
|
|
|
2044
|
|
|
2045 -- If not at start of line definition need new line
|
|
|
2046
|
|
|
2047 if File.Col /= 1 then
|
|
|
2048 New_Line (File);
|
|
|
2049
|
|
|
2050 -- For files other than standard error and standard output, we
|
|
|
2051 -- make sure that an empty file has a single line feed, so that
|
|
|
2052 -- it is properly formatted. We avoid this for the standard files
|
|
|
2053 -- because it is too much of a nuisance to have these odd line
|
|
|
2054 -- feeds when nothing has been written to the file.
|
|
|
2055
|
|
|
2056 -- We also avoid this for files opened in append mode, in
|
|
|
2057 -- accordance with (RM A.8.2(10))
|
|
|
2058
|
|
|
2059 elsif (File /= Standard_Err and then File /= Standard_Out)
|
|
|
2060 and then (File.Line = 1 and then File.Page = 1)
|
|
|
2061 and then Mode (File) = Out_File
|
|
|
2062 then
|
|
|
2063 New_Line (File);
|
|
|
2064 end if;
|
|
|
2065 end if;
|
|
|
2066 end Terminate_Line;
|
|
|
2067
|
|
|
2068 ------------
|
|
|
2069 -- Ungetc --
|
|
|
2070 ------------
|
|
|
2071
|
|
|
2072 procedure Ungetc (ch : int; File : File_Type) is
|
|
|
2073 begin
|
|
|
2074 if ch /= EOF then
|
|
|
2075 if ungetc (ch, File.Stream) = EOF then
|
|
|
2076 raise Device_Error;
|
|
|
2077 end if;
|
|
|
2078 end if;
|
|
|
2079 end Ungetc;
|
|
|
2080
|
|
|
2081 -----------
|
|
|
2082 -- Write --
|
|
|
2083 -----------
|
|
|
2084
|
|
|
2085 -- This is the primitive Stream Write routine, used when a Text_IO file
|
|
|
2086 -- is treated directly as a stream using Text_IO.Streams.Stream.
|
|
|
2087
|
|
|
2088 procedure Write
|
|
|
2089 (File : in out Text_AFCB;
|
|
|
2090 Item : Stream_Element_Array)
|
|
|
2091 is
|
|
|
2092 pragma Warnings (Off, File);
|
|
|
2093 -- Because in this implementation we don't need IN OUT, we only read
|
|
|
2094
|
|
|
2095 function Has_Translated_Characters return Boolean;
|
|
|
2096 -- return True if Item array contains a character which will be
|
|
|
2097 -- translated under the text file mode. There is only one such
|
|
|
2098 -- character under DOS based systems which is character 10.
|
|
|
2099
|
|
|
2100 text_translation_required : Boolean;
|
|
|
2101 for text_translation_required'Size use Character'Size;
|
|
|
2102 pragma Import (C, text_translation_required,
|
|
|
2103 "__gnat_text_translation_required");
|
|
|
2104
|
|
|
2105 Siz : constant size_t := Item'Length;
|
|
|
2106
|
|
|
2107 -------------------------------
|
|
|
2108 -- Has_Translated_Characters --
|
|
|
2109 -------------------------------
|
|
|
2110
|
|
|
2111 function Has_Translated_Characters return Boolean is
|
|
|
2112 begin
|
|
|
2113 for K in Item'Range loop
|
|
|
2114 if Item (K) = 10 then
|
|
|
2115 return True;
|
|
|
2116 end if;
|
|
|
2117 end loop;
|
|
|
2118 return False;
|
|
|
2119 end Has_Translated_Characters;
|
|
|
2120
|
|
|
2121 Needs_Binary_Write : constant Boolean :=
|
|
|
2122 text_translation_required and then Has_Translated_Characters;
|
|
|
2123
|
|
|
2124 -- Start of processing for Write
|
|
|
2125
|
|
|
2126 begin
|
|
|
2127 if File.Mode = FCB.In_File then
|
|
|
2128 raise Mode_Error;
|
|
|
2129 end if;
|
|
|
2130
|
|
|
2131 -- Now we do the write. Since this is a text file, it is normally in
|
|
|
2132 -- text mode, but stream data must be written in binary mode, so we
|
|
|
2133 -- temporarily set binary mode for the write, resetting it after. This
|
|
|
2134 -- is done only if needed (i.e. there is some characters in Item which
|
|
|
2135 -- needs to be written using the binary mode).
|
|
|
2136 -- These calls have no effect in a system (like Unix) where there is
|
|
|
2137 -- no distinction between text and binary files.
|
|
|
2138
|
|
|
2139 -- Since the character translation is done at the time the buffer is
|
|
|
2140 -- written (this is true under Windows) we first flush current buffer
|
|
|
2141 -- with text mode if needed.
|
|
|
2142
|
|
|
2143 if Needs_Binary_Write then
|
|
|
2144 if fflush (File.Stream) = -1 then
|
|
|
2145 raise Device_Error;
|
|
|
2146 end if;
|
|
|
2147
|
|
|
2148 set_binary_mode (fileno (File.Stream));
|
|
|
2149 end if;
|
|
|
2150
|
|
|
2151 if fwrite (Item'Address, 1, Siz, File.Stream) /= Siz then
|
|
|
2152 raise Device_Error;
|
|
|
2153 end if;
|
|
|
2154
|
|
|
2155 -- At this point we need to flush the buffer using the binary mode then
|
|
|
2156 -- we reset to text mode.
|
|
|
2157
|
|
|
2158 if Needs_Binary_Write then
|
|
|
2159 if fflush (File.Stream) = -1 then
|
|
|
2160 raise Device_Error;
|
|
|
2161 end if;
|
|
|
2162
|
|
|
2163 set_text_mode (fileno (File.Stream));
|
|
|
2164 end if;
|
|
|
2165 end Write;
|
|
|
2166
|
|
|
2167 begin
|
|
|
2168 -- Initialize Standard Files
|
|
|
2169
|
|
|
2170 for J in WC_Encoding_Method loop
|
|
|
2171 if WC_Encoding = WC_Encoding_Letters (J) then
|
|
|
2172 Default_WCEM := J;
|
|
|
2173 end if;
|
|
|
2174 end loop;
|
|
|
2175
|
|
|
2176 Initialize_Standard_Files;
|
|
|
2177
|
|
|
2178 FIO.Chain_File (AP (Standard_In));
|
|
|
2179 FIO.Chain_File (AP (Standard_Out));
|
|
|
2180 FIO.Chain_File (AP (Standard_Err));
|
|
|
2181
|
|
|
2182 end Ada.Text_IO;
|
