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-------------------------------------------------------------------------------
--- --
--- GNAT RUN-TIME COMPONENTS --
--- --
--- A D A . W I D E _ T E X T _ I O . G E N E R I C _ A U X --
--- --
--- S p e c --
--- --
--- $Revision: 1.3.10.1 $
--- --
--- Copyright (C) 1992-2001 Free Software Foundation, Inc. --
--- --
--- GNAT is free software; you can redistribute it and/or modify it under --
--- terms of the GNU General Public License as published by the Free Soft- --
--- ware Foundation; either version 2, or (at your option) any later ver- --
--- sion. GNAT is distributed in the hope that it will be useful, but WITH- --
--- OUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY --
--- or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License --
--- for more details. You should have received a copy of the GNU General --
--- Public License distributed with GNAT; see file COPYING. If not, write --
--- to the Free Software Foundation, 59 Temple Place - Suite 330, Boston, --
--- MA 02111-1307, USA. --
--- --
--- As a special exception, if other files instantiate generics from this --
--- unit, or you link this unit with other files to produce an executable, --
--- this unit does not by itself cause the resulting executable to be --
--- covered by the GNU General Public License. This exception does not --
--- however invalidate any other reasons why the executable file might be --
--- covered by the GNU Public License. --
--- --
--- GNAT was originally developed by the GNAT team at New York University. --
--- Extensive contributions were provided by Ada Core Technologies Inc. --
--- --
-------------------------------------------------------------------------------
-
--- This package contains a set of auxiliary routines used by Wide_Text_IO
--- generic children, including for reading and writing numeric strings.
-
--- Note: although this is the Wide version of the package, the interface
--- here is still in terms of Character and String rather than Wide_Character
--- and Wide_String, since all numeric strings are composed entirely of
--- characters in the range of type Standard.Character, and the basic
--- conversion routines work with Character rather than Wide_Character.
-
-package Ada.Wide_Text_IO.Generic_Aux is
-
- -- Note: for all the Load routines, File indicates the file to be read,
- -- Buf is the string into which data is stored, Ptr is the index of the
- -- last character stored so far, and is updated if additional characters
- -- are stored. Data_Error is raised if the input overflows Buf. The only
- -- Load routines that do a file status check are Load_Skip and Load_Width
- -- so one of these two routines must be called first.
-
- procedure Check_End_Of_Field
- (File : File_Type;
- Buf : String;
- Stop : Integer;
- Ptr : Integer;
- Width : Field);
- -- This routine is used after doing a get operations on a numeric value.
- -- Buf is the string being scanned, and Stop is the last character of
- -- the field being scanned. Ptr is as set by the call to the scan routine
- -- that scanned out the numeric value, i.e. it points one past the last
- -- character scanned, and Width is the width parameter from the Get call.
- --
- -- There are two cases, if Width is non-zero, then a check is made that
- -- the remainder of the field is all blanks. If Width is zero, then it
- -- means that the scan routine scanned out only part of the field. We
- -- have already scanned out the field that the ACVC tests seem to expect
- -- us to read (even if it does not follow the syntax of the type being
- -- scanned, e.g. allowing negative exponents in integers, and underscores
- -- at the end of the string), so we just raise Data_Error.
-
- procedure Check_On_One_Line (File : File_Type; Length : Integer);
- -- Check to see if item of length Integer characters can fit on
- -- current line. Call New_Line if not, first checking that the
- -- line length can accommodate Length characters, raise Layout_Error
- -- if item is too large for a single line.
-
- function Is_Blank (C : Character) return Boolean;
- -- Determines if C is a blank (space or tab)
-
- procedure Load_Width
- (File : File_Type;
- Width : in Field;
- Buf : out String;
- Ptr : in out Integer);
- -- Loads exactly Width characters, unless a line mark is encountered first
-
- procedure Load_Skip (File : File_Type);
- -- Skips leading blanks and line and page marks, if the end of file is
- -- read without finding a non-blank character, then End_Error is raised.
- -- Note: a blank is defined as a space or horizontal tab (RM A.10.6(5)).
-
- procedure Load
- (File : File_Type;
- Buf : out String;
- Ptr : in out Integer;
- Char : Character;
- Loaded : out Boolean);
- -- If next character is Char, loads it, otherwise no characters are loaded
- -- Loaded is set to indicate whether or not the character was found.
-
- procedure Load
- (File : File_Type;
- Buf : out String;
- Ptr : in out Integer;
- Char : Character);
- -- Same as above, but no indication if character is loaded
-
- procedure Load
- (File : File_Type;
- Buf : out String;
- Ptr : in out Integer;
- Char1 : Character;
- Char2 : Character;
- Loaded : out Boolean);
- -- If next character is Char1 or Char2, loads it, otherwise no characters
- -- are loaded. Loaded is set to indicate whether or not one of the two
- -- characters was found.
-
- procedure Load
- (File : File_Type;
- Buf : out String;
- Ptr : in out Integer;
- Char1 : Character;
- Char2 : Character);
- -- Same as above, but no indication if character is loaded
-
- procedure Load_Digits
- (File : File_Type;
- Buf : out String;
- Ptr : in out Integer;
- Loaded : out Boolean);
- -- Loads a sequence of zero or more decimal digits. Loaded is set if
- -- at least one digit is loaded.
-
- procedure Load_Digits
- (File : File_Type;
- Buf : out String;
- Ptr : in out Integer);
- -- Same as above, but no indication if character is loaded
-
- procedure Load_Extended_Digits
- (File : File_Type;
- Buf : out String;
- Ptr : in out Integer;
- Loaded : out Boolean);
- -- Like Load_Digits, but also allows extended digits a-f and A-F
-
- procedure Load_Extended_Digits
- (File : File_Type;
- Buf : out String;
- Ptr : in out Integer);
- -- Same as above, but no indication if character is loaded
-
- procedure Put_Item (File : File_Type; Str : String);
- -- This routine is like Wide_Text_IO.Put, except that it checks for
- -- overflow of bounded lines, as described in (RM A.10.6(8)). It is used
- -- for all output of numeric values and of enumeration values. Note that
- -- the buffer is of type String. Put_Item deals with converting this to
- -- Wide_Characters as required.
-
- procedure Store_Char
- (File : File_Type;
- ch : Integer;
- Buf : out String;
- Ptr : in out Integer);
- -- Store a single character in buffer, checking for overflow and
- -- adjusting the column number in the file to reflect the fact
- -- that a character has been acquired from the input stream.
- -- The pos value of the character to store is in ch on entry.
-
- procedure String_Skip (Str : String; Ptr : out Integer);
- -- Used in the Get from string procedures to skip leading blanks in the
- -- string. Ptr is set to the index of the first non-blank. If the string
- -- is all blanks, then the excption End_Error is raised, Note that blank
- -- is defined as a space or horizontal tab (RM A.10.6(5)).
-
- procedure Ungetc (ch : Integer; File : File_Type);
- -- Pushes back character into stream, using ungetc. The caller has
- -- checked that the file is in read status. Device_Error is raised
- -- if the character cannot be pushed back. An attempt to push back
- -- an end of file (EOF) is ignored.
-
-private
- pragma Inline (Is_Blank);
-
-end Ada.Wide_Text_IO.Generic_Aux;
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