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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 -- S p e c --
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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 -- This package contains a set of auxiliary routines used by the 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 private package Ada.Text_IO.Generic_Aux is
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36
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37 -- Note: for all the Load routines, File indicates the file to be read,
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38 -- Buf is the string into which data is stored, Ptr is the index of the
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39 -- last character stored so far, and is updated if additional characters
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40 -- are stored. Data_Error is raised if the input overflows Buf. The only
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41 -- Load routines that do a file status check are Load_Skip and Load_Width
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42 -- so one of these two routines must be called first.
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43
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44 procedure Check_End_Of_Field
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45 (Buf : String;
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46 Stop : Integer;
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47 Ptr : Integer;
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48 Width : Field);
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49 -- This routine is used after doing a get operations on a numeric value.
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50 -- Buf is the string being scanned, and Stop is the last character of
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51 -- the field being scanned. Ptr is as set by the call to the scan routine
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52 -- that scanned out the numeric value, i.e. it points one past the last
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53 -- character scanned, and Width is the width parameter from the Get call.
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54 --
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55 -- There are two cases, if Width is non-zero, then a check is made that
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56 -- the remainder of the field is all blanks. If Width is zero, then it
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57 -- means that the scan routine scanned out only part of the field. We
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58 -- have already scanned out the field that the ACVC tests seem to expect
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59 -- us to read (even if it does not follow the syntax of the type being
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60 -- scanned, e.g. allowing negative exponents in integers, and underscores
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61 -- at the end of the string), so we just raise Data_Error.
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62
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63 procedure Check_On_One_Line (File : File_Type; Length : Integer);
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64 -- Check to see if item of length Integer characters can fit on
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65 -- current line. Call New_Line if not, first checking that the
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66 -- line length can accommodate Length characters, raise Layout_Error
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67 -- if item is too large for a single line.
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68
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69 function Getc (File : File_Type) return Integer;
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70 -- Gets next character from file, which has already been checked for
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71 -- being in read status, and returns the character read if no error
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72 -- occurs. The result is EOF if the end of file was read. Note that
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73 -- the Col value is not bumped, so it is the caller's responsibility
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74 -- to bump it if necessary.
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75
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76 function Is_Blank (C : Character) return Boolean;
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77 -- Determines if C is a blank (space or tab)
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78
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79 procedure Load_Width
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80 (File : File_Type;
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81 Width : Field;
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82 Buf : out String;
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83 Ptr : in out Integer);
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84 -- Loads exactly Width characters, unless a line mark is encountered first
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85
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86 procedure Load_Skip (File : File_Type);
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87 -- Skips leading blanks and line and page marks, if the end of file is
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88 -- read without finding a non-blank character, then End_Error is raised.
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89 -- Note: a blank is defined as a space or horizontal tab (RM A.10.6(5)).
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90
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91 procedure Load
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92 (File : File_Type;
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93 Buf : out String;
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94 Ptr : in out Integer;
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95 Char : Character;
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96 Loaded : out Boolean);
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97 -- If next character is Char, loads it, otherwise no characters are loaded
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98 -- Loaded is set to indicate whether or not the character was found.
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99
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100 procedure Load
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101 (File : File_Type;
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102 Buf : out String;
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103 Ptr : in out Integer;
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104 Char : Character);
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105 -- Same as above, but no indication if character is loaded
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106
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107 procedure Load
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108 (File : File_Type;
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109 Buf : out String;
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110 Ptr : in out Integer;
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111 Char1 : Character;
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112 Char2 : Character;
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113 Loaded : out Boolean);
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114 -- If next character is Char1 or Char2, loads it, otherwise no characters
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115 -- are loaded. Loaded is set to indicate whether or not one of the two
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116 -- characters was found.
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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 Char1 : Character;
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123 Char2 : Character);
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124 -- Same as above, but no indication if character is loaded
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125
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126 procedure Load_Digits
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127 (File : File_Type;
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128 Buf : out String;
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129 Ptr : in out Integer;
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130 Loaded : out Boolean);
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131 -- Loads a sequence of zero or more decimal digits. Loaded is set if
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132 -- at least one digit is loaded.
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133
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134 procedure Load_Digits
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135 (File : File_Type;
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136 Buf : out String;
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137 Ptr : in out Integer);
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138 -- Same as above, but no indication if character is loaded
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139
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140 procedure Load_Extended_Digits
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141 (File : File_Type;
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142 Buf : out String;
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143 Ptr : in out Integer;
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144 Loaded : out Boolean);
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145 -- Like Load_Digits, but also allows extended digits a-f and A-F
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146
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147 procedure Load_Extended_Digits
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148 (File : File_Type;
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149 Buf : out String;
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150 Ptr : in out Integer);
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151 -- Same as above, but no indication if character is loaded
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152
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153 function Nextc (File : File_Type) return Integer;
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154 -- Like Getc, but includes a call to Ungetc, so that the file
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155 -- pointer is not moved by the call.
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156
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157 procedure Put_Item (File : File_Type; Str : String);
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158 -- This routine is like Text_IO.Put, except that it checks for overflow
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159 -- of bounded lines, as described in (RM A.10.6(8)). It is used for
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160 -- all output of numeric values and of enumeration values.
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161
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162 procedure Store_Char
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163 (File : File_Type;
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164 ch : Integer;
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165 Buf : in out String;
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166 Ptr : in out Integer);
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167 -- Store a single character in buffer, checking for overflow and
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168 -- adjusting the column number in the file to reflect the fact
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169 -- that a character has been acquired from the input stream. If
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170 -- the character will not fit in the buffer it is stored in the
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171 -- last character position of the buffer and Ptr is unchanged.
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172 -- No exception is raised in this case, it is the caller's job
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173 -- to raise Data_Error if the buffer fills up, so typically the
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174 -- caller will make the buffer one character longer than needed.
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175
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176 procedure String_Skip (Str : String; Ptr : out Integer);
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177 -- Used in the Get from string procedures to skip leading blanks in the
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178 -- string. Ptr is set to the index of the first non-blank. If the string
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179 -- is all blanks, then the exception End_Error is raised, Note that blank
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180 -- is defined as a space or horizontal tab (RM A.10.6(5)).
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181
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182 procedure Ungetc (ch : Integer; File : File_Type);
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183 -- Pushes back character into stream, using ungetc. The caller has
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184 -- checked that the file is in read status. Device_Error is raised
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185 -- if the character cannot be pushed back. An attempt to push back
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186 -- an end of file (EOF) is ignored.
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187
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188 private
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189 pragma Inline (Is_Blank);
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190
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191 end Ada.Text_IO.Generic_Aux;
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