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-------------------------------------------------------------------------------
--- --
--- GNAT COMPILER COMPONENTS --
--- --
--- S Y S T E M . V A L _ U T I L --
--- --
--- S p e c --
--- --
--- $Revision: 1.1.16.2 $
--- --
--- Copyright (C) 1992,1993,1994,1995,1996 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 2, 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. See the GNU General Public License --
--- for more details. You should have received a copy of the GNU General --
--- Public License distributed with GNAT; see file COPYING. If not, write --
--- to the Free Software Foundation, 59 Temple Place - Suite 330, Boston, --
--- MA 02111-1307, USA. --
--- --
--- As a special exception, if other files instantiate generics from this --
--- unit, or you link this unit with other files to produce an executable, --
--- this unit does not by itself cause the resulting executable to be --
--- covered by the GNU General Public License. This exception does not --
--- however invalidate any other reasons why the executable file might be --
--- covered by the GNU Public License. --
--- --
--- 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 (Val_Util);
-
- 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 : 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.
-
- function Scan_Exponent
- (Str : String;
- Ptr : 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 : 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;
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