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1 706 jeremybenn
------------------------------------------------------------------------------
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--                                                                          --
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--                         GNAT COMPILER COMPONENTS                         --
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--                                                                          --
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--                      S Y S T E M . V A L _ U T I L                       --
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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 provides some common utilities used by the s-valxxx files
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package System.Val_Util is
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   pragma Pure;
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   procedure Normalize_String
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     (S    : in out String;
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      F, L : out Integer);
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   --  This procedure scans the string S setting F to be the index of the first
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   --  non-blank character of S and L to be the index of the last non-blank
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   --  character of S. Any lower case characters present in S will be folded
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   --  to their upper case equivalent except for character literals. If S
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   --  consists of entirely blanks then Constraint_Error is raised.
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   --
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   --  Note: if S is the null string, F is set to S'First, L to S'Last
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   procedure Scan_Sign
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     (Str   : String;
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      Ptr   : not null access Integer;
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      Max   : Integer;
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      Minus : out Boolean;
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      Start : out Positive);
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   --  The Str, Ptr, Max parameters are as for the scan routines (Str is the
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   --  string to be scanned starting at Ptr.all, and Max is the index of the
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   --  last character in the string). Scan_Sign first scans out any initial
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   --  blanks, raising Constraint_Error if the field is all blank. It then
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   --  checks for and skips an initial plus or minus, requiring a non-blank
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   --  character to follow (Constraint_Error is raised if plus or minus
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   --  appears at the end of the string or with a following blank). Minus is
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   --  set True if a minus sign was skipped, and False otherwise. On exit
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   --  Ptr.all points to the character after the sign, or to the first
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   --  non-blank character if no sign is present. Start is set to the point
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   --  to the first non-blank character (sign or digit after it).
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   --
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   --  Note: if Str is null, i.e. if Max is less than Ptr, then this is a
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   --  special case of an all-blank string, and Ptr is unchanged, and hence
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   --  is greater than Max as required in this case. Constraint_Error is
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   --  also raised in this case.
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   procedure Scan_Plus_Sign
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     (Str   : String;
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      Ptr   : not null access Integer;
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      Max   : Integer;
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      Start : out Positive);
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   --  Same as Scan_Sign, but allows only plus, not minus.
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   --  This is used for modular types.
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   function Scan_Exponent
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     (Str  : String;
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      Ptr  : not null access Integer;
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      Max  : Integer;
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      Real : Boolean := False) return Integer;
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   --  Called to scan a possible exponent. Str, Ptr, Max are as described above
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   --  for Scan_Sign. If Ptr.all < Max and Str (Ptr.all) = 'E' or 'e', then an
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   --  exponent is scanned out, with the exponent value returned in Exp, and
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   --  Ptr.all updated to point past the exponent. If the exponent field is
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   --  incorrectly formed or not present, then Ptr.all is unchanged, and the
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   --  returned exponent value is zero. Real indicates whether a minus sign
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   --  is permitted (True = permitted). Very large exponents are handled by
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   --  returning a suitable large value. If the base is zero, then any value
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   --  is allowed, and otherwise the large value will either cause underflow
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   --  or overflow during the scaling process which is fine.
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   procedure Scan_Trailing_Blanks (Str : String; P : Positive);
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   --  Checks that the remainder of the field Str (P .. Str'Last) is all
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   --  blanks. Raises Constraint_Error if a non-blank character is found.
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   procedure Scan_Underscore
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     (Str : String;
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      P   : in out Natural;
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      Ptr : not null access Integer;
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      Max : Integer;
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      Ext : Boolean);
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   --  Called if an underscore is encountered while scanning digits. Str (P)
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   --  contains the underscore. Ptr it the pointer to be returned to the
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   --  ultimate caller of the scan routine, Max is the maximum subscript in
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   --  Str, and Ext indicates if extended digits are allowed. In the case
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   --  where the underscore is invalid, Constraint_Error is raised with Ptr
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   --  set appropriately, otherwise control returns with P incremented past
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   --  the underscore.
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end System.Val_Util;

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