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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 . G E N E R I C _ A U X --
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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 Interfaces.C_Streams; use Interfaces.C_Streams;
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33 with System.File_IO;
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34 with System.File_Control_Block;
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35
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36 package body Ada.Text_IO.Generic_Aux is
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37
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38 package FIO renames System.File_IO;
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39 package FCB renames System.File_Control_Block;
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40 subtype AP is FCB.AFCB_Ptr;
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41
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42 ------------------------
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43 -- Check_End_Of_Field --
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44 ------------------------
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45
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46 procedure Check_End_Of_Field
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47 (Buf : String;
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48 Stop : Integer;
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49 Ptr : Integer;
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50 Width : Field)
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51 is
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52 begin
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53 if Ptr > Stop then
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54 return;
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55
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56 elsif Width = 0 then
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57 raise Data_Error;
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58
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59 else
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60 for J in Ptr .. Stop loop
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61 if not Is_Blank (Buf (J)) then
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62 raise Data_Error;
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63 end if;
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64 end loop;
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65 end if;
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66 end Check_End_Of_Field;
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67
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68 -----------------------
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69 -- Check_On_One_Line --
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70 -----------------------
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71
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72 procedure Check_On_One_Line
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73 (File : File_Type;
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74 Length : Integer)
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75 is
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76 begin
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77 FIO.Check_Write_Status (AP (File));
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78
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79 if File.Line_Length /= 0 then
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80 if Count (Length) > File.Line_Length then
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81 raise Layout_Error;
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82 elsif File.Col + Count (Length) > File.Line_Length + 1 then
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83 New_Line (File);
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84 end if;
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85 end if;
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86 end Check_On_One_Line;
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87
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88 ----------
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89 -- Getc --
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90 ----------
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91
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92 function Getc (File : File_Type) return int is
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93 ch : int;
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94
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95 begin
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96 ch := fgetc (File.Stream);
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97
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98 if ch = EOF and then ferror (File.Stream) /= 0 then
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99 raise Device_Error;
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100 else
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101 return ch;
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102 end if;
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103 end Getc;
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104
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105 --------------
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106 -- Is_Blank --
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107 --------------
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108
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109 function Is_Blank (C : Character) return Boolean is
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110 begin
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111 return C = ' ' or else C = ASCII.HT;
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112 end Is_Blank;
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113
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114 ----------
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115 -- Load --
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116 ----------
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117
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118 procedure Load
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119 (File : File_Type;
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120 Buf : out String;
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121 Ptr : in out Integer;
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122 Char : Character;
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123 Loaded : out Boolean)
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124 is
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125 ch : int;
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126
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127 begin
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128 ch := Getc (File);
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129
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130 if ch = Character'Pos (Char) then
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131 Store_Char (File, ch, Buf, Ptr);
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132 Loaded := True;
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133 else
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134 Ungetc (ch, File);
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135 Loaded := False;
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136 end if;
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137 end Load;
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138
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139 procedure Load
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140 (File : File_Type;
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141 Buf : out String;
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142 Ptr : in out Integer;
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143 Char : Character)
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144 is
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145 ch : int;
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146
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147 begin
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148 ch := Getc (File);
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149
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150 if ch = Character'Pos (Char) then
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151 Store_Char (File, ch, Buf, Ptr);
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152 else
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153 Ungetc (ch, File);
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154 end if;
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155 end Load;
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156
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157 procedure Load
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158 (File : File_Type;
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159 Buf : out String;
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160 Ptr : in out Integer;
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161 Char1 : Character;
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162 Char2 : Character;
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163 Loaded : out Boolean)
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164 is
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165 ch : int;
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166
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167 begin
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168 ch := Getc (File);
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169
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170 if ch = Character'Pos (Char1) or else ch = Character'Pos (Char2) then
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171 Store_Char (File, ch, Buf, Ptr);
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172 Loaded := True;
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173 else
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174 Ungetc (ch, File);
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175 Loaded := False;
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176 end if;
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177 end Load;
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178
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179 procedure Load
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180 (File : File_Type;
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181 Buf : out String;
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182 Ptr : in out Integer;
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183 Char1 : Character;
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184 Char2 : Character)
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185 is
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186 ch : int;
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187
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188 begin
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189 ch := Getc (File);
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190
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191 if ch = Character'Pos (Char1) or else ch = Character'Pos (Char2) then
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192 Store_Char (File, ch, Buf, Ptr);
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193 else
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194 Ungetc (ch, File);
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195 end if;
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196 end Load;
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197
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198 -----------------
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199 -- Load_Digits --
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200 -----------------
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201
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202 procedure Load_Digits
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203 (File : File_Type;
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204 Buf : out String;
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205 Ptr : in out Integer;
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206 Loaded : out Boolean)
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207 is
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208 ch : int;
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209 After_Digit : Boolean;
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210
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211 begin
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212 ch := Getc (File);
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213
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214 if ch not in Character'Pos ('0') .. Character'Pos ('9') then
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215 Loaded := False;
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216
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217 else
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218 Loaded := True;
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219 After_Digit := True;
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220
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221 loop
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222 Store_Char (File, ch, Buf, Ptr);
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223 ch := Getc (File);
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224
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225 if ch in Character'Pos ('0') .. Character'Pos ('9') then
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226 After_Digit := True;
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227
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228 elsif ch = Character'Pos ('_') and then After_Digit then
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229 After_Digit := False;
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230
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231 else
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232 exit;
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233 end if;
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234 end loop;
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235 end if;
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236
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237 Ungetc (ch, File);
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238 end Load_Digits;
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239
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240 procedure Load_Digits
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241 (File : File_Type;
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242 Buf : out String;
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243 Ptr : in out Integer)
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244 is
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245 ch : int;
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246 After_Digit : Boolean;
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247
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248 begin
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249 ch := Getc (File);
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250
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251 if ch in Character'Pos ('0') .. Character'Pos ('9') then
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252 After_Digit := True;
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253
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254 loop
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255 Store_Char (File, ch, Buf, Ptr);
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256 ch := Getc (File);
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257
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258 if ch in Character'Pos ('0') .. Character'Pos ('9') then
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259 After_Digit := True;
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260
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261 elsif ch = Character'Pos ('_') and then After_Digit then
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262 After_Digit := False;
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263
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264 else
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265 exit;
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266 end if;
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267 end loop;
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268 end if;
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269
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270 Ungetc (ch, File);
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271 end Load_Digits;
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272
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273 --------------------------
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274 -- Load_Extended_Digits --
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275 --------------------------
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276
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277 procedure Load_Extended_Digits
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278 (File : File_Type;
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279 Buf : out String;
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280 Ptr : in out Integer;
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281 Loaded : out Boolean)
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282 is
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283 ch : int;
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284 After_Digit : Boolean := False;
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285
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286 begin
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287 Loaded := False;
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288
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289 loop
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290 ch := Getc (File);
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291
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292 if ch in Character'Pos ('0') .. Character'Pos ('9')
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293 or else
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294 ch in Character'Pos ('a') .. Character'Pos ('f')
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295 or else
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296 ch in Character'Pos ('A') .. Character'Pos ('F')
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297 then
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298 After_Digit := True;
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299
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300 elsif ch = Character'Pos ('_') and then After_Digit then
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301 After_Digit := False;
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302
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303 else
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304 exit;
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305 end if;
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306
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307 Store_Char (File, ch, Buf, Ptr);
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308 Loaded := True;
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309 end loop;
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310
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311 Ungetc (ch, File);
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312 end Load_Extended_Digits;
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313
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314 procedure Load_Extended_Digits
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315 (File : File_Type;
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316 Buf : out String;
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317 Ptr : in out Integer)
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318 is
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319 Junk : Boolean;
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320 pragma Unreferenced (Junk);
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321 begin
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322 Load_Extended_Digits (File, Buf, Ptr, Junk);
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323 end Load_Extended_Digits;
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324
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325 ---------------
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326 -- Load_Skip --
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327 ---------------
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328
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329 procedure Load_Skip (File : File_Type) is
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330 C : Character;
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331
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332 begin
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333 FIO.Check_Read_Status (AP (File));
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334
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335 -- Loop till we find a non-blank character (note that as usual in
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336 -- Text_IO, blank includes horizontal tab). Note that Get deals with
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337 -- the Before_LM and Before_LM_PM flags appropriately.
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338
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339 loop
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340 Get (File, C);
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341 exit when not Is_Blank (C);
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342 end loop;
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343
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344 Ungetc (Character'Pos (C), File);
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345 File.Col := File.Col - 1;
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346 end Load_Skip;
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347
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348 ----------------
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349 -- Load_Width --
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350 ----------------
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351
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352 procedure Load_Width
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353 (File : File_Type;
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354 Width : Field;
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355 Buf : out String;
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356 Ptr : in out Integer)
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357 is
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358 ch : int;
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359
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360 begin
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361 FIO.Check_Read_Status (AP (File));
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362
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363 -- If we are immediately before a line mark, then we have no characters.
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364 -- This is always a data error, so we may as well raise it right away.
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365
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366 if File.Before_LM then
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367 raise Data_Error;
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368
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369 else
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370 for J in 1 .. Width loop
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371 ch := Getc (File);
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372
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373 if ch = EOF then
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374 return;
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375
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376 elsif ch = LM then
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377 Ungetc (ch, File);
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378 return;
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379
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380 else
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381 Store_Char (File, ch, Buf, Ptr);
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382 end if;
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383 end loop;
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384 end if;
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385 end Load_Width;
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386
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387 -----------
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388 -- Nextc --
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389 -----------
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390
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391 function Nextc (File : File_Type) return int is
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392 ch : int;
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393
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394 begin
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395 ch := fgetc (File.Stream);
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396
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397 if ch = EOF then
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398 if ferror (File.Stream) /= 0 then
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399 raise Device_Error;
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400 else
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401 return EOF;
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402 end if;
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403
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404 else
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405 Ungetc (ch, File);
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406 return ch;
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407 end if;
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408 end Nextc;
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409
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410 --------------
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411 -- Put_Item --
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412 --------------
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413
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414 procedure Put_Item (File : File_Type; Str : String) is
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415 begin
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416 Check_On_One_Line (File, Str'Length);
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417 Put (File, Str);
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418 end Put_Item;
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419
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420 ----------------
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421 -- Store_Char --
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422 ----------------
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423
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424 procedure Store_Char
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425 (File : File_Type;
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426 ch : int;
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427 Buf : in out String;
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428 Ptr : in out Integer)
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429 is
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430 begin
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431 File.Col := File.Col + 1;
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432
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433 if Ptr < Buf'Last then
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434 Ptr := Ptr + 1;
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435 end if;
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436
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437 Buf (Ptr) := Character'Val (ch);
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438 end Store_Char;
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439
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440 -----------------
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441 -- String_Skip --
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442 -----------------
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443
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444 procedure String_Skip (Str : String; Ptr : out Integer) is
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445 begin
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446 -- Routines calling String_Skip malfunction if Str'Last = Positive'Last.
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447 -- It's too much trouble to make this silly case work, so we just raise
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448 -- Program_Error with an appropriate message. We raise Program_Error
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449 -- rather than Constraint_Error because we don't want this case to be
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450 -- converted to Data_Error.
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451
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452 if Str'Last = Positive'Last then
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453 raise Program_Error with
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454 "string upper bound is Positive'Last, not supported";
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455 end if;
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456
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457 -- Normal case where Str'Last < Positive'Last
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458
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459 Ptr := Str'First;
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460
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461 loop
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462 if Ptr > Str'Last then
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463 raise End_Error;
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464
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465 elsif not Is_Blank (Str (Ptr)) then
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466 return;
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467
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468 else
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469 Ptr := Ptr + 1;
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470 end if;
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471 end loop;
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472 end String_Skip;
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473
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474 ------------
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475 -- Ungetc --
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476 ------------
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477
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478 procedure Ungetc (ch : int; File : File_Type) is
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479 begin
|
|
|
480 if ch /= EOF then
|
|
|
481 if ungetc (ch, File.Stream) = EOF then
|
|
|
482 raise Device_Error;
|
|
|
483 end if;
|
|
|
484 end if;
|
|
|
485 end Ungetc;
|
|
|
486
|
|
|
487 end Ada.Text_IO.Generic_Aux;
|
