+++ /dev/null
-------------------------------------------------------------------------------
--- --
--- GNAT COMPILER COMPONENTS --
--- --
--- S Y S T E M . V A L _ U T I L --
--- --
--- B o d y --
--- --
--- $Revision: 1.1.16.1 $
--- --
--- Copyright (C) 1992-2001, 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. --
--- --
-------------------------------------------------------------------------------
-
-with GNAT.Case_Util; use GNAT.Case_Util;
-
-package body System.Val_Util is
-
- ----------------------
- -- Normalize_String --
- ----------------------
-
- procedure Normalize_String
- (S : in out String;
- F, L : out Integer)
- is
- begin
- F := S'First;
- L := S'Last;
-
- -- Scan for leading spaces
-
- while F <= L and then S (F) = ' ' loop
- F := F + 1;
- end loop;
-
- -- Check for case when the string contained no characters
-
- if F > L then
- raise Constraint_Error;
- end if;
-
- -- Scan for trailing spaces
-
- while S (L) = ' ' loop
- L := L - 1;
- end loop;
-
- -- Except in the case of a character literal, convert to upper case
-
- if S (F) /= ''' then
- for J in F .. L loop
- S (J) := To_Upper (S (J));
- end loop;
- end if;
-
- end Normalize_String;
-
- -------------------
- -- Scan_Exponent --
- -------------------
-
- function Scan_Exponent
- (Str : String;
- Ptr : access Integer;
- Max : Integer;
- Real : Boolean := False)
- return Integer
- is
- P : Natural := Ptr.all;
- M : Boolean;
- X : Integer;
-
- begin
- if P >= Max
- or else (Str (P) /= 'E' and then Str (P) /= 'e')
- then
- return 0;
- end if;
-
- -- We have an E/e, see if sign follows
-
- P := P + 1;
-
- if Str (P) = '+' then
- P := P + 1;
-
- if P > Max then
- return 0;
- else
- M := False;
- end if;
-
- elsif Str (P) = '-' then
- P := P + 1;
-
- if P > Max or else not Real then
- return 0;
- else
- M := True;
- end if;
-
- else
- M := False;
- end if;
-
- if Str (P) not in '0' .. '9' then
- return 0;
- end if;
-
- -- Scan out the exponent value as an unsigned integer. Values larger
- -- than (Integer'Last / 10) are simply considered large enough here.
- -- This assumption is correct for all machines we know of (e.g. in
- -- the case of 16 bit integers it allows exponents up to 3276, which
- -- is large enough for the largest floating types in base 2.)
-
- X := 0;
-
- loop
- if X < (Integer'Last / 10) then
- X := X * 10 + (Character'Pos (Str (P)) - Character'Pos ('0'));
- end if;
-
- P := P + 1;
-
- exit when P > Max;
-
- if Str (P) = '_' then
- Scan_Underscore (Str, P, Ptr, Max, False);
- else
- exit when Str (P) not in '0' .. '9';
- end if;
- end loop;
-
- if M then
- X := -X;
- end if;
-
- Ptr.all := P;
- return X;
-
- end Scan_Exponent;
-
- ---------------
- -- Scan_Sign --
- ---------------
-
- procedure Scan_Sign
- (Str : String;
- Ptr : access Integer;
- Max : Integer;
- Minus : out Boolean;
- Start : out Positive)
- is
- P : Natural := Ptr.all;
-
- begin
- -- Deal with case of null string (all blanks!). As per spec, we
- -- raise constraint error, with Ptr unchanged, and thus > Max.
-
- if P > Max then
- raise Constraint_Error;
- end if;
-
- -- Scan past initial blanks
-
- while Str (P) = ' ' loop
- P := P + 1;
-
- if P > Max then
- Ptr.all := P;
- raise Constraint_Error;
- end if;
- end loop;
-
- Start := P;
-
- -- Remember an initial minus sign
-
- if Str (P) = '-' then
- Minus := True;
- P := P + 1;
-
- if P > Max then
- Ptr.all := Start;
- raise Constraint_Error;
- end if;
-
- -- Skip past an initial plus sign
-
- elsif Str (P) = '+' then
- Minus := False;
- P := P + 1;
-
- if P > Max then
- Ptr.all := Start;
- raise Constraint_Error;
- end if;
-
- else
- Minus := False;
- end if;
-
- Ptr.all := P;
- end Scan_Sign;
-
- --------------------------
- -- Scan_Trailing_Blanks --
- --------------------------
-
- procedure Scan_Trailing_Blanks (Str : String; P : Positive) is
- begin
- for J in P .. Str'Last loop
- if Str (J) /= ' ' then
- raise Constraint_Error;
- end if;
- end loop;
- end Scan_Trailing_Blanks;
-
- ---------------------
- -- Scan_Underscore --
- ---------------------
-
- procedure Scan_Underscore
- (Str : String;
- P : in out Natural;
- Ptr : access Integer;
- Max : Integer;
- Ext : Boolean)
- is
- C : Character;
-
- begin
- P := P + 1;
-
- -- If underscore is at the end of string, then this is an error and
- -- we raise Constraint_Error, leaving the pointer past the undescore.
- -- This seems a bit strange. It means e,g, that if the field is:
-
- -- 345_
-
- -- that Constraint_Error is raised. You might think that the RM in
- -- this case would scan out the 345 as a valid integer, leaving the
- -- pointer at the underscore, but the ACVC suite clearly requires
- -- an error in this situation (see for example CE3704M).
-
- if P > Max then
- Ptr.all := P;
- raise Constraint_Error;
- end if;
-
- -- Similarly, if no digit follows the underscore raise an error. This
- -- also catches the case of double underscore which is also an error.
-
- C := Str (P);
-
- if C in '0' .. '9'
- or else
- (Ext and then (C in 'A' .. 'F' or else C in 'a' .. 'f'))
- then
- return;
- else
- Ptr.all := P;
- raise Constraint_Error;
- end if;
- end Scan_Underscore;
-
-end System.Val_Util;
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