| ------------------------------------------------------------------------------ |
| -- -- |
| -- 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) 1992-2021, 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 -- |
| -- <http://www.gnu.org/licenses/>. -- |
| -- -- |
| -- 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 Load_Integer |
| (File : File_Type; |
| Buf : out String; |
| Ptr : in out Natural); |
| -- Loads a possibly signed integer literal value |
| |
| procedure Load_Real |
| (File : File_Type; |
| Buf : out String; |
| Ptr : in out Natural); |
| -- Loads a possibly signed real literal value |
| |
| 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 exception 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; |
