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1 706 jeremybenn
------------------------------------------------------------------------------
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--                                                                          --
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--                         GNAT RUN-TIME COMPONENTS                         --
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--                                                                          --
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--         A D A . W I D E _ T E X T _ I O . G E N E R I C _ A U X          --
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--                                                                          --
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--                                 S p e c                                  --
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--                                                                          --
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--          Copyright (C) 1992-2009, Free Software Foundation, Inc.         --
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--                                                                          --
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-- GNAT is free software;  you can  redistribute it  and/or modify it under --
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-- terms of the  GNU General Public License as published  by the Free Soft- --
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-- ware  Foundation;  either version 3,  or (at your option) any later ver- --
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-- sion.  GNAT is distributed in the hope that it will be useful, but WITH- --
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-- OUT ANY WARRANTY;  without even the  implied warranty of MERCHANTABILITY --
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-- or FITNESS FOR A PARTICULAR PURPOSE.                                     --
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--                                                                          --
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-- As a special exception under Section 7 of GPL version 3, you are granted --
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-- additional permissions described in the GCC Runtime Library Exception,   --
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-- version 3.1, as published by the Free Software Foundation.               --
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--                                                                          --
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-- You should have received a copy of the GNU General Public License and    --
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-- a copy of the GCC Runtime Library Exception along with this program;     --
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-- see the files COPYING3 and COPYING.RUNTIME respectively.  If not, see    --
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-- <http://www.gnu.org/licenses/>.                                          --
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--                                                                          --
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-- GNAT was originally developed  by the GNAT team at  New York University. --
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-- Extensive contributions were provided by Ada Core Technologies Inc.      --
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--                                                                          --
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------------------------------------------------------------------------------
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--  This package contains a set of auxiliary routines used by Wide_Text_IO
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--  generic children, including for reading and writing numeric strings.
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--  Note: although this is the Wide version of the package, the interface
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--  here is still in terms of Character and String rather than Wide_Character
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--  and Wide_String, since all numeric strings are composed entirely of
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--  characters in the range of type Standard.Character, and the basic
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--  conversion routines work with Character rather than Wide_Character.
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package Ada.Wide_Text_IO.Generic_Aux is
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   --  Note: for all the Load routines, File indicates the file to be read,
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   --  Buf is the string into which data is stored, Ptr is the index of the
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   --  last character stored so far, and is updated if additional characters
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   --  are stored. Data_Error is raised if the input overflows Buf. The only
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   --  Load routines that do a file status check are Load_Skip and Load_Width
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   --  so one of these two routines must be called first.
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   procedure Check_End_Of_Field
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     (Buf   : String;
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      Stop  : Integer;
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      Ptr   : Integer;
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      Width : Field);
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   --  This routine is used after doing a get operations on a numeric value.
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   --  Buf is the string being scanned, and Stop is the last character of
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   --  the field being scanned. Ptr is as set by the call to the scan routine
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   --  that scanned out the numeric value, i.e. it points one past the last
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   --  character scanned, and Width is the width parameter from the Get call.
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   --
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   --  There are two cases, if Width is non-zero, then a check is made that
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   --  the remainder of the field is all blanks. If Width is zero, then it
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   --  means that the scan routine scanned out only part of the field. We
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   --  have already scanned out the field that the ACVC tests seem to expect
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   --  us to read (even if it does not follow the syntax of the type being
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   --  scanned, e.g. allowing negative exponents in integers, and underscores
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   --  at the end of the string), so we just raise Data_Error.
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   procedure Check_On_One_Line (File : File_Type; Length : Integer);
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   --  Check to see if item of length Integer characters can fit on
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   --  current line. Call New_Line if not, first checking that the
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   --  line length can accommodate Length characters, raise Layout_Error
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   --  if item is too large for a single line.
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   function Is_Blank (C : Character) return Boolean;
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   --  Determines if C is a blank (space or tab)
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   procedure Load_Width
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     (File  : File_Type;
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      Width : Field;
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      Buf   : out String;
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      Ptr   : in out Integer);
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   --  Loads exactly Width characters, unless a line mark is encountered first
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   procedure Load_Skip (File  : File_Type);
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   --  Skips leading blanks and line and page marks, if the end of file is
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   --  read without finding a non-blank character, then End_Error is raised.
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   --  Note: a blank is defined as a space or horizontal tab (RM A.10.6(5)).
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   procedure Load
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     (File   : File_Type;
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      Buf    : out String;
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      Ptr    : in out Integer;
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      Char   : Character;
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      Loaded : out Boolean);
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   --  If next character is Char, loads it, otherwise no characters are loaded
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   --  Loaded is set to indicate whether or not the character was found.
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   procedure Load
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     (File   : File_Type;
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      Buf    : out String;
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      Ptr    : in out Integer;
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      Char   : Character);
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   --  Same as above, but no indication if character is loaded
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   procedure Load
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     (File   : File_Type;
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      Buf    : out String;
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      Ptr    : in out Integer;
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      Char1  : Character;
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      Char2  : Character;
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      Loaded : out Boolean);
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   --  If next character is Char1 or Char2, loads it, otherwise no characters
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   --  are loaded. Loaded is set to indicate whether or not one of the two
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   --  characters was found.
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   procedure Load
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     (File   : File_Type;
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      Buf    : out String;
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      Ptr    : in out Integer;
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      Char1  : Character;
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      Char2  : Character);
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   --  Same as above, but no indication if character is loaded
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   procedure Load_Digits
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     (File   : File_Type;
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      Buf    : out String;
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      Ptr    : in out Integer;
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      Loaded : out Boolean);
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   --  Loads a sequence of zero or more decimal digits. Loaded is set if
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   --  at least one digit is loaded.
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   procedure Load_Digits
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     (File   : File_Type;
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      Buf    : out String;
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      Ptr    : in out Integer);
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   --  Same as above, but no indication if character is loaded
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   procedure Load_Extended_Digits
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     (File   : File_Type;
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      Buf    : out String;
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      Ptr    : in out Integer;
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      Loaded : out Boolean);
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   --  Like Load_Digits, but also allows extended digits a-f and A-F
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   procedure Load_Extended_Digits
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     (File   : File_Type;
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      Buf    : out String;
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      Ptr    : in out Integer);
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   --  Same as above, but no indication if character is loaded
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   procedure Put_Item (File : File_Type; Str : String);
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   --  This routine is like Wide_Text_IO.Put, except that it checks for
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   --  overflow of bounded lines, as described in (RM A.10.6(8)). It is used
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   --  for all output of numeric values and of enumeration values. Note that
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   --  the buffer is of type String. Put_Item deals with converting this to
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   --  Wide_Characters as required.
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   procedure Store_Char
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     (File : File_Type;
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      ch   : Integer;
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      Buf  : out String;
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      Ptr  : in out Integer);
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   --  Store a single character in buffer, checking for overflow and
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   --  adjusting the column number in the file to reflect the fact
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   --  that a character has been acquired from the input stream.
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   --  The pos value of the character to store is in ch on entry.
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   procedure String_Skip (Str : String; Ptr : out Integer);
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   --  Used in the Get from string procedures to skip leading blanks in the
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   --  string. Ptr is set to the index of the first non-blank. If the string
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   --  is all blanks, then the excption End_Error is raised, Note that blank
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   --  is defined as a space or horizontal tab (RM A.10.6(5)).
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   procedure Ungetc (ch : Integer; File : File_Type);
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   --  Pushes back character into stream, using ungetc. The caller has
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   --  checked that the file is in read status. Device_Error is raised
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   --  if the character cannot be pushed back. An attempt to push back
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   --  an end of file (EOF) is ignored.
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private
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   pragma Inline (Is_Blank);
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end Ada.Wide_Text_IO.Generic_Aux;

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