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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 . W I D E _ W I D E _ 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 -- S p e c --
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8 -- --
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145
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9 -- Copyright (C) 1992-2019, Free Software Foundation, Inc. --
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111
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10 -- --
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11 -- GNAT is free software; you can redistribute it and/or modify it under --
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12 -- terms of the GNU General Public License as published by the Free Soft- --
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13 -- ware Foundation; either version 3, or (at your option) any later ver- --
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14 -- sion. GNAT is distributed in the hope that it will be useful, but WITH- --
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15 -- OUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY --
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16 -- or FITNESS FOR A PARTICULAR PURPOSE. --
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17 -- --
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18 -- As a special exception under Section 7 of GPL version 3, you are granted --
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19 -- additional permissions described in the GCC Runtime Library Exception, --
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20 -- version 3.1, as published by the Free Software Foundation. --
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21 -- --
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22 -- You should have received a copy of the GNU General Public License and --
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23 -- a copy of the GCC Runtime Library Exception along with this program; --
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24 -- see the files COPYING3 and COPYING.RUNTIME respectively. If not, see --
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25 -- <http://www.gnu.org/licenses/>. --
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26 -- --
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27 -- GNAT was originally developed by the GNAT team at New York University. --
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28 -- Extensive contributions were provided by Ada Core Technologies Inc. --
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29 -- --
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30 ------------------------------------------------------------------------------
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31
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32 -- This package contains a set of auxiliary routines used by Wide_Wide_Text_IO
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33 -- generic children, including for reading and writing numeric strings.
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34
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35 -- Note: although this is the Wide version of the package, the interface here
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36 -- is still in terms of Character and String rather than Wide_Wide_Character
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37 -- and Wide_Wide_String, since all numeric strings are composed entirely of
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38 -- characters in the range of type Standard.Character, and the basic
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39 -- conversion routines work with Character rather than Wide_Wide_Character.
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40
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41 package Ada.Wide_Wide_Text_IO.Generic_Aux is
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42
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43 -- Note: for all the Load routines, File indicates the file to be read,
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44 -- Buf is the string into which data is stored, Ptr is the index of the
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45 -- last character stored so far, and is updated if additional characters
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46 -- are stored. Data_Error is raised if the input overflows Buf. The only
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47 -- Load routines that do a file status check are Load_Skip and Load_Width
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48 -- so one of these two routines must be called first.
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49
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50 procedure Check_End_Of_Field
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51 (Buf : String;
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52 Stop : Integer;
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53 Ptr : Integer;
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54 Width : Field);
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55 -- This routine is used after doing a get operations on a numeric value.
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56 -- Buf is the string being scanned, and Stop is the last character of
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57 -- the field being scanned. Ptr is as set by the call to the scan routine
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58 -- that scanned out the numeric value, i.e. it points one past the last
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59 -- character scanned, and Width is the width parameter from the Get call.
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60 --
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61 -- There are two cases, if Width is non-zero, then a check is made that
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62 -- the remainder of the field is all blanks. If Width is zero, then it
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63 -- means that the scan routine scanned out only part of the field. We
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64 -- have already scanned out the field that the ACVC tests seem to expect
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65 -- us to read (even if it does not follow the syntax of the type being
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66 -- scanned, e.g. allowing negative exponents in integers, and underscores
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67 -- at the end of the string), so we just raise Data_Error.
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68
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69 procedure Check_On_One_Line (File : File_Type; Length : Integer);
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70 -- Check to see if item of length Integer characters can fit on
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71 -- current line. Call New_Line if not, first checking that the
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72 -- line length can accommodate Length characters, raise Layout_Error
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73 -- if item is too large for a single line.
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74
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75 function Is_Blank (C : Character) return Boolean;
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76 -- Determines if C is a blank (space or tab)
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77
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78 procedure Load_Width
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79 (File : File_Type;
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80 Width : Field;
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81 Buf : out String;
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82 Ptr : in out Integer);
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83 -- Loads exactly Width characters, unless a line mark is encountered first
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84
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85 procedure Load_Skip (File : File_Type);
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86 -- Skips leading blanks and line and page marks, if the end of file is
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87 -- read without finding a non-blank character, then End_Error is raised.
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88 -- Note: a blank is defined as a space or horizontal tab (RM A.10.6(5)).
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89
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90 procedure Load
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91 (File : File_Type;
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92 Buf : out String;
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93 Ptr : in out Integer;
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94 Char : Character;
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95 Loaded : out Boolean);
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96 -- If next character is Char, loads it, otherwise no characters are loaded
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97 -- Loaded is set to indicate whether or not the character was found.
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98
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99 procedure Load
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100 (File : File_Type;
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101 Buf : out String;
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102 Ptr : in out Integer;
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103 Char : Character);
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104 -- Same as above, but no indication if character is loaded
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105
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106 procedure Load
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107 (File : File_Type;
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108 Buf : out String;
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109 Ptr : in out Integer;
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110 Char1 : Character;
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111 Char2 : Character;
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112 Loaded : out Boolean);
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113 -- If next character is Char1 or Char2, loads it, otherwise no characters
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114 -- are loaded. Loaded is set to indicate whether or not one of the two
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115 -- characters was found.
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116
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117 procedure Load
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118 (File : File_Type;
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119 Buf : out String;
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120 Ptr : in out Integer;
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121 Char1 : Character;
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122 Char2 : Character);
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123 -- Same as above, but no indication if character is loaded
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124
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125 procedure Load_Digits
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126 (File : File_Type;
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127 Buf : out String;
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128 Ptr : in out Integer;
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129 Loaded : out Boolean);
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130 -- Loads a sequence of zero or more decimal digits. Loaded is set if
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131 -- at least one digit is loaded.
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132
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133 procedure Load_Digits
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134 (File : File_Type;
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135 Buf : out String;
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136 Ptr : in out Integer);
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137 -- Same as above, but no indication if character is loaded
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138
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139 procedure Load_Extended_Digits
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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 Loaded : out Boolean);
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144 -- Like Load_Digits, but also allows extended digits a-f and A-F
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145
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146 procedure Load_Extended_Digits
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147 (File : File_Type;
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148 Buf : out String;
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149 Ptr : in out Integer);
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150 -- Same as above, but no indication if character is loaded
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151
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152 procedure Put_Item (File : File_Type; Str : String);
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153 -- This routine is like Wide_Wide_Text_IO.Put, except that it checks for
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154 -- overflow of bounded lines, as described in (RM A.10.6(8)). It is used
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155 -- for all output of numeric values and of enumeration values. Note that
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156 -- the buffer is of type String. Put_Item deals with converting this to
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157 -- Wide_Wide_Characters as required.
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158
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159 procedure Store_Char
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160 (File : File_Type;
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161 ch : Integer;
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162 Buf : out String;
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163 Ptr : in out Integer);
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164 -- Store a single character in buffer, checking for overflow and
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165 -- adjusting the column number in the file to reflect the fact
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166 -- that a character has been acquired from the input stream.
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167 -- The pos value of the character to store is in ch on entry.
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168
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169 procedure String_Skip (Str : String; Ptr : out Integer);
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170 -- Used in the Get from string procedures to skip leading blanks in the
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171 -- string. Ptr is set to the index of the first non-blank. If the string
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172 -- is all blanks, then the excption End_Error is raised, Note that blank
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173 -- is defined as a space or horizontal tab (RM A.10.6(5)).
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174
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175 procedure Ungetc (ch : Integer; File : File_Type);
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176 -- Pushes back character into stream, using ungetc. The caller has
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177 -- checked that the file is in read status. Device_Error is raised
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178 -- if the character cannot be pushed back. An attempt to push back
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179 -- an end of file (EOF) is ignored.
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180
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181 private
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182 pragma Inline (Is_Blank);
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183
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184 end Ada.Wide_Wide_Text_IO.Generic_Aux;
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