gcc/ada/libgnat/a-wtgeau.ads

   1 ------------------------------------------------------------------------------
   2 --                                                                          --
   3 --                         GNAT RUN-TIME COMPONENTS                         --
   4 --                                                                          --
   5 --         A D A . W I D E _ T E X T _ I O . G E N E R I C _ A U X          --
   6 --                                                                          --
   7 --                                 S p e c                                  --
   8 --                                                                          --
   9 --          Copyright (C) 1992-2017, Free Software Foundation, Inc.         --
  10 --                                                                          --
  11 -- GNAT is free software;  you can  redistribute it  and/or modify it under --
  12 -- terms of the  GNU General Public License as published  by the Free Soft- --
  13 -- ware  Foundation;  either version 3,  or (at your option) any later ver- --
  14 -- sion.  GNAT is distributed in the hope that it will be useful, but WITH- --
  15 -- OUT ANY WARRANTY;  without even the  implied warranty of MERCHANTABILITY --
  16 -- or FITNESS FOR A PARTICULAR PURPOSE.                                     --
  17 --                                                                          --
  18 -- As a special exception under Section 7 of GPL version 3, you are granted --
  19 -- additional permissions described in the GCC Runtime Library Exception,   --
  20 -- version 3.1, as published by the Free Software Foundation.               --
  21 --                                                                          --
  22 -- You should have received a copy of the GNU General Public License and    --
  23 -- a copy of the GCC Runtime Library Exception along with this program;     --
  24 -- see the files COPYING3 and COPYING.RUNTIME respectively.  If not, see    --
  25 -- <http://www.gnu.org/licenses/>.                                          --
  26 --                                                                          --
  27 -- GNAT was originally developed  by the GNAT team at  New York University. --
  28 -- Extensive contributions were provided by Ada Core Technologies Inc.      --
  29 --                                                                          --
  30 ------------------------------------------------------------------------------
  31
  32 --  This package contains a set of auxiliary routines used by Wide_Text_IO
  33 --  generic children, including for reading and writing numeric strings.
  34
  35 --  Note: although this is the Wide version of the package, the interface
  36 --  here is still in terms of Character and String rather than Wide_Character
  37 --  and Wide_String, since all numeric strings are composed entirely of
  38 --  characters in the range of type Standard.Character, and the basic
  39 --  conversion routines work with Character rather than Wide_Character.
  40
  41 package Ada.Wide_Text_IO.Generic_Aux is
  42
  43    --  Note: for all the Load routines, File indicates the file to be read,
  44    --  Buf is the string into which data is stored, Ptr is the index of the
  45    --  last character stored so far, and is updated if additional characters
  46    --  are stored. Data_Error is raised if the input overflows Buf. The only
  47    --  Load routines that do a file status check are Load_Skip and Load_Width
  48    --  so one of these two routines must be called first.
  49
  50    procedure Check_End_Of_Field
  51      (Buf   : String;
  52       Stop  : Integer;
  53       Ptr   : Integer;
  54       Width : Field);
  55    --  This routine is used after doing a get operations on a numeric value.
  56    --  Buf is the string being scanned, and Stop is the last character of
  57    --  the field being scanned. Ptr is as set by the call to the scan routine
  58    --  that scanned out the numeric value, i.e. it points one past the last
  59    --  character scanned, and Width is the width parameter from the Get call.
  60    --
  61    --  There are two cases, if Width is non-zero, then a check is made that
  62    --  the remainder of the field is all blanks. If Width is zero, then it
  63    --  means that the scan routine scanned out only part of the field. We
  64    --  have already scanned out the field that the ACVC tests seem to expect
  65    --  us to read (even if it does not follow the syntax of the type being
  66    --  scanned, e.g. allowing negative exponents in integers, and underscores
  67    --  at the end of the string), so we just raise Data_Error.
  68
  69    procedure Check_On_One_Line (File : File_Type; Length : Integer);
  70    --  Check to see if item of length Integer characters can fit on
  71    --  current line. Call New_Line if not, first checking that the
  72    --  line length can accommodate Length characters, raise Layout_Error
  73    --  if item is too large for a single line.
  74
  75    function Is_Blank (C : Character) return Boolean;
  76    --  Determines if C is a blank (space or tab)
  77
  78    procedure Load_Width
  79      (File  : File_Type;
  80       Width : Field;
  81       Buf   : out String;
  82       Ptr   : in out Integer);
  83    --  Loads exactly Width characters, unless a line mark is encountered first
  84
  85    procedure Load_Skip (File  : File_Type);
  86    --  Skips leading blanks and line and page marks, if the end of file is
  87    --  read without finding a non-blank character, then End_Error is raised.
  88    --  Note: a blank is defined as a space or horizontal tab (RM A.10.6(5)).
  89
  90    procedure Load
  91      (File   : File_Type;
  92       Buf    : out String;
  93       Ptr    : in out Integer;
  94       Char   : Character;
  95       Loaded : out Boolean);
  96    --  If next character is Char, loads it, otherwise no characters are loaded
  97    --  Loaded is set to indicate whether or not the character was found.
  98
  99    procedure Load
 100      (File   : File_Type;
 101       Buf    : out String;
 102       Ptr    : in out Integer;
 103       Char   : Character);
 104    --  Same as above, but no indication if character is loaded
 105
 106    procedure Load
 107      (File   : File_Type;
 108       Buf    : out String;
 109       Ptr    : in out Integer;
 110       Char1  : Character;
 111       Char2  : Character;
 112       Loaded : out Boolean);
 113    --  If next character is Char1 or Char2, loads it, otherwise no characters
 114    --  are loaded. Loaded is set to indicate whether or not one of the two
 115    --  characters was found.
 116
 117    procedure Load
 118      (File   : File_Type;
 119       Buf    : out String;
 120       Ptr    : in out Integer;
 121       Char1  : Character;
 122       Char2  : Character);
 123    --  Same as above, but no indication if character is loaded
 124
 125    procedure Load_Digits
 126      (File   : File_Type;
 127       Buf    : out String;
 128       Ptr    : in out Integer;
 129       Loaded : out Boolean);
 130    --  Loads a sequence of zero or more decimal digits. Loaded is set if
 131    --  at least one digit is loaded.
 132
 133    procedure Load_Digits
 134      (File   : File_Type;
 135       Buf    : out String;
 136       Ptr    : in out Integer);
 137    --  Same as above, but no indication if character is loaded
 138
 139    procedure Load_Extended_Digits
 140      (File   : File_Type;
 141       Buf    : out String;
 142       Ptr    : in out Integer;
 143       Loaded : out Boolean);
 144    --  Like Load_Digits, but also allows extended digits a-f and A-F
 145
 146    procedure Load_Extended_Digits
 147      (File   : File_Type;
 148       Buf    : out String;
 149       Ptr    : in out Integer);
 150    --  Same as above, but no indication if character is loaded
 151
 152    procedure Put_Item (File : File_Type; Str : String);
 153    --  This routine is like Wide_Text_IO.Put, except that it checks for
 154    --  overflow of bounded lines, as described in (RM A.10.6(8)). It is used
 155    --  for all output of numeric values and of enumeration values. Note that
 156    --  the buffer is of type String. Put_Item deals with converting this to
 157    --  Wide_Characters as required.
 158
 159    procedure Store_Char
 160      (File : File_Type;
 161       ch   : Integer;
 162       Buf  : out String;
 163       Ptr  : in out Integer);
 164    --  Store a single character in buffer, checking for overflow and
 165    --  adjusting the column number in the file to reflect the fact
 166    --  that a character has been acquired from the input stream.
 167    --  The pos value of the character to store is in ch on entry.
 168
 169    procedure String_Skip (Str : String; Ptr : out Integer);
 170    --  Used in the Get from string procedures to skip leading blanks in the
 171    --  string. Ptr is set to the index of the first non-blank. If the string
 172    --  is all blanks, then the excption End_Error is raised, Note that blank
 173    --  is defined as a space or horizontal tab (RM A.10.6(5)).
 174
 175    procedure Ungetc (ch : Integer; File : File_Type);
 176    --  Pushes back character into stream, using ungetc. The caller has
 177    --  checked that the file is in read status. Device_Error is raised
 178    --  if the character cannot be pushed back. An attempt to push back
 179    --  an end of file (EOF) is ignored.
 180
 181 private
 182    pragma Inline (Is_Blank);
 183
 184 end Ada.Wide_Text_IO.Generic_Aux;