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+------------------------------------------------------------------------------
+-- --
+-- GNAT COMPILER COMPONENTS --
+-- --
+-- S Y S T E M . V A L _ U T I L --
+-- --
+-- S p e c --
+-- --
+-- Copyright (C) 1992-2012, 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 provides some common utilities used by the s-valxxx files
+
+package System.Val_Util is
+ pragma Pure;
+
+ procedure Bad_Value (S : String);
+ pragma No_Return (Bad_Value);
+ -- Raises constraint error with message: bad input for 'Value: "xxx"
+
+ procedure Normalize_String
+ (S : in out String;
+ F, L : out Integer);
+ -- This procedure scans the string S setting F to be the index of the first
+ -- non-blank character of S and L to be the index of the last non-blank
+ -- character of S. Any lower case characters present in S will be folded
+ -- to their upper case equivalent except for character literals. If S
+ -- consists of entirely blanks then Constraint_Error is raised.
+ --
+ -- Note: if S is the null string, F is set to S'First, L to S'Last
+
+ procedure Scan_Sign
+ (Str : String;
+ Ptr : not null access Integer;
+ Max : Integer;
+ Minus : out Boolean;
+ Start : out Positive);
+ -- The Str, Ptr, Max parameters are as for the scan routines (Str is the
+ -- string to be scanned starting at Ptr.all, and Max is the index of the
+ -- last character in the string). Scan_Sign first scans out any initial
+ -- blanks, raising Constraint_Error if the field is all blank. It then
+ -- checks for and skips an initial plus or minus, requiring a non-blank
+ -- character to follow (Constraint_Error is raised if plus or minus
+ -- appears at the end of the string or with a following blank). Minus is
+ -- set True if a minus sign was skipped, and False otherwise. On exit
+ -- Ptr.all points to the character after the sign, or to the first
+ -- non-blank character if no sign is present. Start is set to the point
+ -- to the first non-blank character (sign or digit after it).
+ --
+ -- Note: if Str is null, i.e. if Max is less than Ptr, then this is a
+ -- special case of an all-blank string, and Ptr is unchanged, and hence
+ -- is greater than Max as required in this case. Constraint_Error is
+ -- also raised in this case.
+
+ procedure Scan_Plus_Sign
+ (Str : String;
+ Ptr : not null access Integer;
+ Max : Integer;
+ Start : out Positive);
+ -- Same as Scan_Sign, but allows only plus, not minus.
+ -- This is used for modular types.
+
+ function Scan_Exponent
+ (Str : String;
+ Ptr : not null access Integer;
+ Max : Integer;
+ Real : Boolean := False) return Integer;
+ -- Called to scan a possible exponent. Str, Ptr, Max are as described above
+ -- for Scan_Sign. If Ptr.all < Max and Str (Ptr.all) = 'E' or 'e', then an
+ -- exponent is scanned out, with the exponent value returned in Exp, and
+ -- Ptr.all updated to point past the exponent. If the exponent field is
+ -- incorrectly formed or not present, then Ptr.all is unchanged, and the
+ -- returned exponent value is zero. Real indicates whether a minus sign
+ -- is permitted (True = permitted). Very large exponents are handled by
+ -- returning a suitable large value. If the base is zero, then any value
+ -- is allowed, and otherwise the large value will either cause underflow
+ -- or overflow during the scaling process which is fine.
+
+ procedure Scan_Trailing_Blanks (Str : String; P : Positive);
+ -- Checks that the remainder of the field Str (P .. Str'Last) is all
+ -- blanks. Raises Constraint_Error if a non-blank character is found.
+
+ procedure Scan_Underscore
+ (Str : String;
+ P : in out Natural;
+ Ptr : not null access Integer;
+ Max : Integer;
+ Ext : Boolean);
+ -- Called if an underscore is encountered while scanning digits. Str (P)
+ -- contains the underscore. Ptr it the pointer to be returned to the
+ -- ultimate caller of the scan routine, Max is the maximum subscript in
+ -- Str, and Ext indicates if extended digits are allowed. In the case
+ -- where the underscore is invalid, Constraint_Error is raised with Ptr
+ -- set appropriately, otherwise control returns with P incremented past
+ -- the underscore.
+
+end System.Val_Util;