192 lines
8.8 KiB
Ada
192 lines
8.8 KiB
Ada
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------------------------------------------------------------------------------
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-- --
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-- GNAT RUN-TIME COMPONENTS --
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-- --
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-- A D A . 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 the Text_IO
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-- generic children, including for reading and writing numeric strings.
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private package Ada.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 Getc (File : File_Type) return Integer;
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-- Gets next character from file, which has already been checked for
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-- being in read status, and returns the character read if no error
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-- occurs. The result is EOF if the end of file was read. Note that
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-- the Col value is not bumped, so it is the caller's responsibility
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-- to bump it if necessary.
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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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function Nextc (File : File_Type) return Integer;
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-- Like Getc, but includes a call to Ungetc, so that the file
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-- pointer is not moved by the call.
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procedure Put_Item (File : File_Type; Str : String);
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-- This routine is like Text_IO.Put, except that it checks for overflow
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-- of bounded lines, as described in (RM A.10.6(8)). It is used for
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-- all output of numeric values and of enumeration values.
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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 : in 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. If
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-- the character will not fit in the buffer it is stored in the
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-- last character position of the buffer and Ptr is unchanged.
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-- No exception is raised in this case, it is the caller's job
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-- to raise Data_Error if the buffer fills up, so typically the
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-- caller will make the buffer one character longer than needed.
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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 exception 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.Text_IO.Generic_Aux;
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