------------------------------------------------------------------------------ -- -- -- 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 -- -- -- -- Copyright (C) 1992-2009, 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 3, 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. -- -- -- -- As a special exception under Section 7 of GPL version 3, you are granted -- -- additional permissions described in the GCC Runtime Library Exception, -- -- version 3.1, as published by the Free Software Foundation. -- -- -- -- You should have received a copy of the GNU General Public License and -- -- a copy of the GCC Runtime Library Exception along with this program; -- -- see the files COPYING3 and COPYING.RUNTIME respectively. If not, see -- -- . -- -- -- -- 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 (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 : 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;