+++ /dev/null
-------------------------------------------------------------------------------
--- --
--- GNAT COMPILER COMPONENTS --
--- --
--- I N T E R F A C E S . P A C K E D _ D E C I M A L --
--- --
--- B o d y --
--- (Version for IBM Mainframe Packed Decimal Format) --
--- --
--- $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 System; use System;
-with Unchecked_Conversion;
-
-package body Interfaces.Packed_Decimal is
-
- type Packed is array (Byte_Length) of Unsigned_8;
- -- The type used internally to represent packed decimal
-
- type Packed_Ptr is access Packed;
- function To_Packed_Ptr is new Unchecked_Conversion (Address, Packed_Ptr);
-
- -- The following array is used to convert a value in the range 0-99 to
- -- a packed decimal format with two hexadecimal nibbles. It is worth
- -- using table look up in this direction because divides are expensive.
-
- Packed_Byte : constant array (00 .. 99) of Unsigned_8 :=
- (16#00#, 16#01#, 16#02#, 16#03#, 16#04#,
- 16#05#, 16#06#, 16#07#, 16#08#, 16#09#,
- 16#10#, 16#11#, 16#12#, 16#13#, 16#14#,
- 16#15#, 16#16#, 16#17#, 16#18#, 16#19#,
- 16#20#, 16#21#, 16#22#, 16#23#, 16#24#,
- 16#25#, 16#26#, 16#27#, 16#28#, 16#29#,
- 16#30#, 16#31#, 16#32#, 16#33#, 16#34#,
- 16#35#, 16#36#, 16#37#, 16#38#, 16#39#,
- 16#40#, 16#41#, 16#42#, 16#43#, 16#44#,
- 16#45#, 16#46#, 16#47#, 16#48#, 16#49#,
- 16#50#, 16#51#, 16#52#, 16#53#, 16#54#,
- 16#55#, 16#56#, 16#57#, 16#58#, 16#59#,
- 16#60#, 16#61#, 16#62#, 16#63#, 16#64#,
- 16#65#, 16#66#, 16#67#, 16#68#, 16#69#,
- 16#70#, 16#71#, 16#72#, 16#73#, 16#74#,
- 16#75#, 16#76#, 16#77#, 16#78#, 16#79#,
- 16#80#, 16#81#, 16#82#, 16#83#, 16#84#,
- 16#85#, 16#86#, 16#87#, 16#88#, 16#89#,
- 16#90#, 16#91#, 16#92#, 16#93#, 16#94#,
- 16#95#, 16#96#, 16#97#, 16#98#, 16#99#);
-
- ---------------------
- -- Int32_To_Packed --
- ---------------------
-
- procedure Int32_To_Packed (V : Integer_32; P : System.Address; D : D32) is
- PP : constant Packed_Ptr := To_Packed_Ptr (P);
- Empty_Nibble : constant Boolean := ((D rem 2) = 0);
- B : constant Byte_Length := (D / 2) + 1;
- VV : Integer_32 := V;
-
- begin
- -- Deal with sign byte first
-
- if VV >= 0 then
- PP (B) := Unsigned_8 (VV rem 10) * 16 + 16#C#;
- VV := VV / 10;
-
- else
- VV := -VV;
- PP (B) := Unsigned_8 (VV rem 10) * 16 + 16#D#;
- end if;
-
- for J in reverse B - 1 .. 2 loop
- if VV = 0 then
- for K in 1 .. J loop
- PP (K) := 16#00#;
- end loop;
-
- return;
-
- else
- PP (J) := Packed_Byte (Integer (VV rem 100));
- VV := VV / 100;
- end if;
- end loop;
-
- -- Deal with leading byte
-
- if Empty_Nibble then
- if VV > 9 then
- raise Constraint_Error;
- else
- PP (1) := Unsigned_8 (VV);
- end if;
-
- else
- if VV > 99 then
- raise Constraint_Error;
- else
- PP (1) := Packed_Byte (Integer (VV));
- end if;
- end if;
-
- end Int32_To_Packed;
-
- ---------------------
- -- Int64_To_Packed --
- ---------------------
-
- procedure Int64_To_Packed (V : Integer_64; P : System.Address; D : D64) is
- PP : constant Packed_Ptr := To_Packed_Ptr (P);
- Empty_Nibble : constant Boolean := ((D rem 2) = 0);
- B : constant Byte_Length := (D / 2) + 1;
- VV : Integer_64 := V;
-
- begin
- -- Deal with sign byte first
-
- if VV >= 0 then
- PP (B) := Unsigned_8 (VV rem 10) * 16 + 16#C#;
- VV := VV / 10;
-
- else
- VV := -VV;
- PP (B) := Unsigned_8 (VV rem 10) * 16 + 16#D#;
- end if;
-
- for J in reverse B - 1 .. 2 loop
- if VV = 0 then
- for K in 1 .. J loop
- PP (K) := 16#00#;
- end loop;
-
- return;
-
- else
- PP (J) := Packed_Byte (Integer (VV rem 100));
- VV := VV / 100;
- end if;
- end loop;
-
- -- Deal with leading byte
-
- if Empty_Nibble then
- if VV > 9 then
- raise Constraint_Error;
- else
- PP (1) := Unsigned_8 (VV);
- end if;
-
- else
- if VV > 99 then
- raise Constraint_Error;
- else
- PP (1) := Packed_Byte (Integer (VV));
- end if;
- end if;
-
- end Int64_To_Packed;
-
- ---------------------
- -- Packed_To_Int32 --
- ---------------------
-
- function Packed_To_Int32 (P : System.Address; D : D32) return Integer_32 is
- PP : constant Packed_Ptr := To_Packed_Ptr (P);
- Empty_Nibble : constant Boolean := ((D mod 2) = 0);
- B : constant Byte_Length := (D / 2) + 1;
- V : Integer_32;
- Dig : Unsigned_8;
- Sign : Unsigned_8;
- J : Positive;
-
- begin
- -- Cases where there is an unused (zero) nibble in the first byte.
- -- Deal with the single digit nibble at the right of this byte
-
- if Empty_Nibble then
- V := Integer_32 (PP (1));
- J := 2;
-
- if V > 9 then
- raise Constraint_Error;
- end if;
-
- -- Cases where all nibbles are used
-
- else
- J := 1;
- end if;
-
- -- Loop to process bytes containing two digit nibbles
-
- while J < B loop
- Dig := Shift_Right (PP (J), 4);
-
- if Dig > 9 then
- raise Constraint_Error;
- else
- V := V * 10 + Integer_32 (Dig);
- end if;
-
- Dig := PP (J) and 16#0F#;
-
- if Dig > 9 then
- raise Constraint_Error;
- else
- V := V * 10 + Integer_32 (Dig);
- end if;
-
- J := J + 1;
- end loop;
-
- -- Deal with digit nibble in sign byte
-
- Dig := Shift_Right (PP (J), 4);
-
- if Dig > 9 then
- raise Constraint_Error;
- else
- V := V * 10 + Integer_32 (Dig);
- end if;
-
- Sign := PP (J) and 16#0F#;
-
- -- Process sign nibble (deal with most common cases first)
-
- if Sign = 16#C# then
- return V;
-
- elsif Sign = 16#D# then
- return -V;
-
- elsif Sign = 16#B# then
- return -V;
-
- elsif Sign >= 16#A# then
- return V;
-
- else
- raise Constraint_Error;
- end if;
- end Packed_To_Int32;
-
- ---------------------
- -- Packed_To_Int64 --
- ---------------------
-
- function Packed_To_Int64 (P : System.Address; D : D64) return Integer_64 is
- PP : constant Packed_Ptr := To_Packed_Ptr (P);
- Empty_Nibble : constant Boolean := ((D mod 2) = 0);
- B : constant Byte_Length := (D / 2) + 1;
- V : Integer_64;
- Dig : Unsigned_8;
- Sign : Unsigned_8;
- J : Positive;
-
- begin
- -- Cases where there is an unused (zero) nibble in the first byte.
- -- Deal with the single digit nibble at the right of this byte
-
- if Empty_Nibble then
- V := Integer_64 (PP (1));
- J := 2;
-
- if V > 9 then
- raise Constraint_Error;
- end if;
-
- -- Cases where all nibbles are used
-
- else
- J := 1;
- end if;
-
- -- Loop to process bytes containing two digit nibbles
-
- while J < B loop
- Dig := Shift_Right (PP (J), 4);
-
- if Dig > 9 then
- raise Constraint_Error;
- else
- V := V * 10 + Integer_64 (Dig);
- end if;
-
- Dig := PP (J) and 16#0F#;
-
- if Dig > 9 then
- raise Constraint_Error;
- else
- V := V * 10 + Integer_64 (Dig);
- end if;
-
- J := J + 1;
- end loop;
-
- -- Deal with digit nibble in sign byte
-
- Dig := Shift_Right (PP (J), 4);
-
- if Dig > 9 then
- raise Constraint_Error;
- else
- V := V * 10 + Integer_64 (Dig);
- end if;
-
- Sign := PP (J) and 16#0F#;
-
- -- Process sign nibble (deal with most common cases first)
-
- if Sign = 16#C# then
- return V;
-
- elsif Sign = 16#D# then
- return -V;
-
- elsif Sign = 16#B# then
- return -V;
-
- elsif Sign >= 16#A# then
- return V;
-
- else
- raise Constraint_Error;
- end if;
- end Packed_To_Int64;
-
-end Interfaces.Packed_Decimal;
projects / msp430-gcc.git / blobdiff