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diff --git a/gcc/ada/s-valuti.ads b/gcc/ada/s-valuti.ads new file mode 100644 index 00000000000..23c62253f13 --- /dev/null +++ b/gcc/ada/s-valuti.ads @@ -0,0 +1,110 @@ +------------------------------------------------------------------------------ +-- -- +-- GNAT COMPILER COMPONENTS -- +-- -- +-- S Y S T E M . V A L _ U T I L -- +-- -- +-- S p e c -- +-- -- +-- $Revision: 1.10 $ -- +-- -- +-- 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. -- +-- It is now maintained by Ada Core Technologies Inc (http://www.gnat.com). -- +-- -- +------------------------------------------------------------------------------ + +-- 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; |