gcc/ada/i-cobol.ads

   1 ------------------------------------------------------------------------------
   2 --                                                                          --
   3 --                         GNAT COMPILER COMPONENTS                         --
   4 --                                                                          --
   5 --                      I N T E R F A C E S . C O B O L                     --
   6 --                                                                          --
   7 --                                 S p e c                                  --
   8 --                             (ASCII Version)                              --
   9 --                                                                          --
  10 --          Copyright (C) 1993-2015, Free Software Foundation, Inc.         --
  11 --                                                                          --
  12 -- This specification is derived from the Ada Reference Manual for use with --
  13 -- GNAT. The copyright notice above, and the license provisions that follow --
  14 -- apply solely to the  contents of the part following the private keyword. --
  15 --                                                                          --
  16 -- GNAT is free software;  you can  redistribute it  and/or modify it under --
  17 -- terms of the  GNU General Public License as published  by the Free Soft- --
  18 -- ware  Foundation;  either version 3,  or (at your option) any later ver- --
  19 -- sion.  GNAT is distributed in the hope that it will be useful, but WITH- --
  20 -- OUT ANY WARRANTY;  without even the  implied warranty of MERCHANTABILITY --
  21 -- or FITNESS FOR A PARTICULAR PURPOSE.                                     --
  22 --                                                                          --
  23 -- As a special exception under Section 7 of GPL version 3, you are granted --
  24 -- additional permissions described in the GCC Runtime Library Exception,   --
  25 -- version 3.1, as published by the Free Software Foundation.               --
  26 --                                                                          --
  27 -- You should have received a copy of the GNU General Public License and    --
  28 -- a copy of the GCC Runtime Library Exception along with this program;     --
  29 -- see the files COPYING3 and COPYING.RUNTIME respectively.  If not, see    --
  30 -- <http://www.gnu.org/licenses/>.                                          --
  31 --                                                                          --
  32 -- GNAT was originally developed  by the GNAT team at  New York University. --
  33 -- Extensive contributions were provided by Ada Core Technologies Inc.      --
  34 --                                                                          --
  35 ------------------------------------------------------------------------------
  36
  37 --  This version of the COBOL interfaces package assumes that the COBOL
  38 --  compiler uses ASCII as its internal representation of characters, i.e.
  39 --  that the type COBOL_Character has the same representation as the Ada
  40 --  type Standard.Character.
  41
  42 package Interfaces.COBOL is
  43    pragma Preelaborate (COBOL);
  44
  45    ------------------------------------------------------------
  46    -- Types And Operations For Internal Data Representations --
  47    ------------------------------------------------------------
  48
  49    type Floating      is new Float;
  50    type Long_Floating is new Long_Float;
  51
  52    type Binary        is new Integer;
  53    type Long_Binary   is new Long_Long_Integer;
  54
  55    Max_Digits_Binary      : constant := 9;
  56    Max_Digits_Long_Binary : constant := 18;
  57
  58    type Decimal_Element is mod 2**4;
  59    type Packed_Decimal is array (Positive range <>) of Decimal_Element;
  60    pragma Pack (Packed_Decimal);
  61
  62    type COBOL_Character is new Character;
  63
  64    Ada_To_COBOL : array (Standard.Character) of COBOL_Character := (
  65      COBOL_Character'Val (000), COBOL_Character'Val (001),
  66      COBOL_Character'Val (002), COBOL_Character'Val (003),
  67      COBOL_Character'Val (004), COBOL_Character'Val (005),
  68      COBOL_Character'Val (006), COBOL_Character'Val (007),
  69      COBOL_Character'Val (008), COBOL_Character'Val (009),
  70      COBOL_Character'Val (010), COBOL_Character'Val (011),
  71      COBOL_Character'Val (012), COBOL_Character'Val (013),
  72      COBOL_Character'Val (014), COBOL_Character'Val (015),
  73      COBOL_Character'Val (016), COBOL_Character'Val (017),
  74      COBOL_Character'Val (018), COBOL_Character'Val (019),
  75      COBOL_Character'Val (020), COBOL_Character'Val (021),
  76      COBOL_Character'Val (022), COBOL_Character'Val (023),
  77      COBOL_Character'Val (024), COBOL_Character'Val (025),
  78      COBOL_Character'Val (026), COBOL_Character'Val (027),
  79      COBOL_Character'Val (028), COBOL_Character'Val (029),
  80      COBOL_Character'Val (030), COBOL_Character'Val (031),
  81      COBOL_Character'Val (032), COBOL_Character'Val (033),
  82      COBOL_Character'Val (034), COBOL_Character'Val (035),
  83      COBOL_Character'Val (036), COBOL_Character'Val (037),
  84      COBOL_Character'Val (038), COBOL_Character'Val (039),
  85      COBOL_Character'Val (040), COBOL_Character'Val (041),
  86      COBOL_Character'Val (042), COBOL_Character'Val (043),
  87      COBOL_Character'Val (044), COBOL_Character'Val (045),
  88      COBOL_Character'Val (046), COBOL_Character'Val (047),
  89      COBOL_Character'Val (048), COBOL_Character'Val (049),
  90      COBOL_Character'Val (050), COBOL_Character'Val (051),
  91      COBOL_Character'Val (052), COBOL_Character'Val (053),
  92      COBOL_Character'Val (054), COBOL_Character'Val (055),
  93      COBOL_Character'Val (056), COBOL_Character'Val (057),
  94      COBOL_Character'Val (058), COBOL_Character'Val (059),
  95      COBOL_Character'Val (060), COBOL_Character'Val (061),
  96      COBOL_Character'Val (062), COBOL_Character'Val (063),
  97      COBOL_Character'Val (064), COBOL_Character'Val (065),
  98      COBOL_Character'Val (066), COBOL_Character'Val (067),
  99      COBOL_Character'Val (068), COBOL_Character'Val (069),
 100      COBOL_Character'Val (070), COBOL_Character'Val (071),
 101      COBOL_Character'Val (072), COBOL_Character'Val (073),
 102      COBOL_Character'Val (074), COBOL_Character'Val (075),
 103      COBOL_Character'Val (076), COBOL_Character'Val (077),
 104      COBOL_Character'Val (078), COBOL_Character'Val (079),
 105      COBOL_Character'Val (080), COBOL_Character'Val (081),
 106      COBOL_Character'Val (082), COBOL_Character'Val (083),
 107      COBOL_Character'Val (084), COBOL_Character'Val (085),
 108      COBOL_Character'Val (086), COBOL_Character'Val (087),
 109      COBOL_Character'Val (088), COBOL_Character'Val (089),
 110      COBOL_Character'Val (090), COBOL_Character'Val (091),
 111      COBOL_Character'Val (092), COBOL_Character'Val (093),
 112      COBOL_Character'Val (094), COBOL_Character'Val (095),
 113      COBOL_Character'Val (096), COBOL_Character'Val (097),
 114      COBOL_Character'Val (098), COBOL_Character'Val (099),
 115      COBOL_Character'Val (100), COBOL_Character'Val (101),
 116      COBOL_Character'Val (102), COBOL_Character'Val (103),
 117      COBOL_Character'Val (104), COBOL_Character'Val (105),
 118      COBOL_Character'Val (106), COBOL_Character'Val (107),
 119      COBOL_Character'Val (108), COBOL_Character'Val (109),
 120      COBOL_Character'Val (110), COBOL_Character'Val (111),
 121      COBOL_Character'Val (112), COBOL_Character'Val (113),
 122      COBOL_Character'Val (114), COBOL_Character'Val (115),
 123      COBOL_Character'Val (116), COBOL_Character'Val (117),
 124      COBOL_Character'Val (118), COBOL_Character'Val (119),
 125      COBOL_Character'Val (120), COBOL_Character'Val (121),
 126      COBOL_Character'Val (122), COBOL_Character'Val (123),
 127      COBOL_Character'Val (124), COBOL_Character'Val (125),
 128      COBOL_Character'Val (126), COBOL_Character'Val (127),
 129      COBOL_Character'Val (128), COBOL_Character'Val (129),
 130      COBOL_Character'Val (130), COBOL_Character'Val (131),
 131      COBOL_Character'Val (132), COBOL_Character'Val (133),
 132      COBOL_Character'Val (134), COBOL_Character'Val (135),
 133      COBOL_Character'Val (136), COBOL_Character'Val (137),
 134      COBOL_Character'Val (138), COBOL_Character'Val (139),
 135      COBOL_Character'Val (140), COBOL_Character'Val (141),
 136      COBOL_Character'Val (142), COBOL_Character'Val (143),
 137      COBOL_Character'Val (144), COBOL_Character'Val (145),
 138      COBOL_Character'Val (146), COBOL_Character'Val (147),
 139      COBOL_Character'Val (148), COBOL_Character'Val (149),
 140      COBOL_Character'Val (150), COBOL_Character'Val (151),
 141      COBOL_Character'Val (152), COBOL_Character'Val (153),
 142      COBOL_Character'Val (154), COBOL_Character'Val (155),
 143      COBOL_Character'Val (156), COBOL_Character'Val (157),
 144      COBOL_Character'Val (158), COBOL_Character'Val (159),
 145      COBOL_Character'Val (160), COBOL_Character'Val (161),
 146      COBOL_Character'Val (162), COBOL_Character'Val (163),
 147      COBOL_Character'Val (164), COBOL_Character'Val (165),
 148      COBOL_Character'Val (166), COBOL_Character'Val (167),
 149      COBOL_Character'Val (168), COBOL_Character'Val (169),
 150      COBOL_Character'Val (170), COBOL_Character'Val (171),
 151      COBOL_Character'Val (172), COBOL_Character'Val (173),
 152      COBOL_Character'Val (174), COBOL_Character'Val (175),
 153      COBOL_Character'Val (176), COBOL_Character'Val (177),
 154      COBOL_Character'Val (178), COBOL_Character'Val (179),
 155      COBOL_Character'Val (180), COBOL_Character'Val (181),
 156      COBOL_Character'Val (182), COBOL_Character'Val (183),
 157      COBOL_Character'Val (184), COBOL_Character'Val (185),
 158      COBOL_Character'Val (186), COBOL_Character'Val (187),
 159      COBOL_Character'Val (188), COBOL_Character'Val (189),
 160      COBOL_Character'Val (190), COBOL_Character'Val (191),
 161      COBOL_Character'Val (192), COBOL_Character'Val (193),
 162      COBOL_Character'Val (194), COBOL_Character'Val (195),
 163      COBOL_Character'Val (196), COBOL_Character'Val (197),
 164      COBOL_Character'Val (198), COBOL_Character'Val (199),
 165      COBOL_Character'Val (200), COBOL_Character'Val (201),
 166      COBOL_Character'Val (202), COBOL_Character'Val (203),
 167      COBOL_Character'Val (204), COBOL_Character'Val (205),
 168      COBOL_Character'Val (206), COBOL_Character'Val (207),
 169      COBOL_Character'Val (208), COBOL_Character'Val (209),
 170      COBOL_Character'Val (210), COBOL_Character'Val (211),
 171      COBOL_Character'Val (212), COBOL_Character'Val (213),
 172      COBOL_Character'Val (214), COBOL_Character'Val (215),
 173      COBOL_Character'Val (216), COBOL_Character'Val (217),
 174      COBOL_Character'Val (218), COBOL_Character'Val (219),
 175      COBOL_Character'Val (220), COBOL_Character'Val (221),
 176      COBOL_Character'Val (222), COBOL_Character'Val (223),
 177      COBOL_Character'Val (224), COBOL_Character'Val (225),
 178      COBOL_Character'Val (226), COBOL_Character'Val (227),
 179      COBOL_Character'Val (228), COBOL_Character'Val (229),
 180      COBOL_Character'Val (230), COBOL_Character'Val (231),
 181      COBOL_Character'Val (232), COBOL_Character'Val (233),
 182      COBOL_Character'Val (234), COBOL_Character'Val (235),
 183      COBOL_Character'Val (236), COBOL_Character'Val (237),
 184      COBOL_Character'Val (238), COBOL_Character'Val (239),
 185      COBOL_Character'Val (240), COBOL_Character'Val (241),
 186      COBOL_Character'Val (242), COBOL_Character'Val (243),
 187      COBOL_Character'Val (244), COBOL_Character'Val (245),
 188      COBOL_Character'Val (246), COBOL_Character'Val (247),
 189      COBOL_Character'Val (248), COBOL_Character'Val (249),
 190      COBOL_Character'Val (250), COBOL_Character'Val (251),
 191      COBOL_Character'Val (252), COBOL_Character'Val (253),
 192      COBOL_Character'Val (254), COBOL_Character'Val (255));
 193
 194    COBOL_To_Ada : array (COBOL_Character) of Standard.Character := (
 195      Standard.Character'Val (000), Standard.Character'Val (001),
 196      Standard.Character'Val (002), Standard.Character'Val (003),
 197      Standard.Character'Val (004), Standard.Character'Val (005),
 198      Standard.Character'Val (006), Standard.Character'Val (007),
 199      Standard.Character'Val (008), Standard.Character'Val (009),
 200      Standard.Character'Val (010), Standard.Character'Val (011),
 201      Standard.Character'Val (012), Standard.Character'Val (013),
 202      Standard.Character'Val (014), Standard.Character'Val (015),
 203      Standard.Character'Val (016), Standard.Character'Val (017),
 204      Standard.Character'Val (018), Standard.Character'Val (019),
 205      Standard.Character'Val (020), Standard.Character'Val (021),
 206      Standard.Character'Val (022), Standard.Character'Val (023),
 207      Standard.Character'Val (024), Standard.Character'Val (025),
 208      Standard.Character'Val (026), Standard.Character'Val (027),
 209      Standard.Character'Val (028), Standard.Character'Val (029),
 210      Standard.Character'Val (030), Standard.Character'Val (031),
 211      Standard.Character'Val (032), Standard.Character'Val (033),
 212      Standard.Character'Val (034), Standard.Character'Val (035),
 213      Standard.Character'Val (036), Standard.Character'Val (037),
 214      Standard.Character'Val (038), Standard.Character'Val (039),
 215      Standard.Character'Val (040), Standard.Character'Val (041),
 216      Standard.Character'Val (042), Standard.Character'Val (043),
 217      Standard.Character'Val (044), Standard.Character'Val (045),
 218      Standard.Character'Val (046), Standard.Character'Val (047),
 219      Standard.Character'Val (048), Standard.Character'Val (049),
 220      Standard.Character'Val (050), Standard.Character'Val (051),
 221      Standard.Character'Val (052), Standard.Character'Val (053),
 222      Standard.Character'Val (054), Standard.Character'Val (055),
 223      Standard.Character'Val (056), Standard.Character'Val (057),
 224      Standard.Character'Val (058), Standard.Character'Val (059),
 225      Standard.Character'Val (060), Standard.Character'Val (061),
 226      Standard.Character'Val (062), Standard.Character'Val (063),
 227      Standard.Character'Val (064), Standard.Character'Val (065),
 228      Standard.Character'Val (066), Standard.Character'Val (067),
 229      Standard.Character'Val (068), Standard.Character'Val (069),
 230      Standard.Character'Val (070), Standard.Character'Val (071),
 231      Standard.Character'Val (072), Standard.Character'Val (073),
 232      Standard.Character'Val (074), Standard.Character'Val (075),
 233      Standard.Character'Val (076), Standard.Character'Val (077),
 234      Standard.Character'Val (078), Standard.Character'Val (079),
 235      Standard.Character'Val (080), Standard.Character'Val (081),
 236      Standard.Character'Val (082), Standard.Character'Val (083),
 237      Standard.Character'Val (084), Standard.Character'Val (085),
 238      Standard.Character'Val (086), Standard.Character'Val (087),
 239      Standard.Character'Val (088), Standard.Character'Val (089),
 240      Standard.Character'Val (090), Standard.Character'Val (091),
 241      Standard.Character'Val (092), Standard.Character'Val (093),
 242      Standard.Character'Val (094), Standard.Character'Val (095),
 243      Standard.Character'Val (096), Standard.Character'Val (097),
 244      Standard.Character'Val (098), Standard.Character'Val (099),
 245      Standard.Character'Val (100), Standard.Character'Val (101),
 246      Standard.Character'Val (102), Standard.Character'Val (103),
 247      Standard.Character'Val (104), Standard.Character'Val (105),
 248      Standard.Character'Val (106), Standard.Character'Val (107),
 249      Standard.Character'Val (108), Standard.Character'Val (109),
 250      Standard.Character'Val (110), Standard.Character'Val (111),
 251      Standard.Character'Val (112), Standard.Character'Val (113),
 252      Standard.Character'Val (114), Standard.Character'Val (115),
 253      Standard.Character'Val (116), Standard.Character'Val (117),
 254      Standard.Character'Val (118), Standard.Character'Val (119),
 255      Standard.Character'Val (120), Standard.Character'Val (121),
 256      Standard.Character'Val (122), Standard.Character'Val (123),
 257      Standard.Character'Val (124), Standard.Character'Val (125),
 258      Standard.Character'Val (126), Standard.Character'Val (127),
 259      Standard.Character'Val (128), Standard.Character'Val (129),
 260      Standard.Character'Val (130), Standard.Character'Val (131),
 261      Standard.Character'Val (132), Standard.Character'Val (133),
 262      Standard.Character'Val (134), Standard.Character'Val (135),
 263      Standard.Character'Val (136), Standard.Character'Val (137),
 264      Standard.Character'Val (138), Standard.Character'Val (139),
 265      Standard.Character'Val (140), Standard.Character'Val (141),
 266      Standard.Character'Val (142), Standard.Character'Val (143),
 267      Standard.Character'Val (144), Standard.Character'Val (145),
 268      Standard.Character'Val (146), Standard.Character'Val (147),
 269      Standard.Character'Val (148), Standard.Character'Val (149),
 270      Standard.Character'Val (150), Standard.Character'Val (151),
 271      Standard.Character'Val (152), Standard.Character'Val (153),
 272      Standard.Character'Val (154), Standard.Character'Val (155),
 273      Standard.Character'Val (156), Standard.Character'Val (157),
 274      Standard.Character'Val (158), Standard.Character'Val (159),
 275      Standard.Character'Val (160), Standard.Character'Val (161),
 276      Standard.Character'Val (162), Standard.Character'Val (163),
 277      Standard.Character'Val (164), Standard.Character'Val (165),
 278      Standard.Character'Val (166), Standard.Character'Val (167),
 279      Standard.Character'Val (168), Standard.Character'Val (169),
 280      Standard.Character'Val (170), Standard.Character'Val (171),
 281      Standard.Character'Val (172), Standard.Character'Val (173),
 282      Standard.Character'Val (174), Standard.Character'Val (175),
 283      Standard.Character'Val (176), Standard.Character'Val (177),
 284      Standard.Character'Val (178), Standard.Character'Val (179),
 285      Standard.Character'Val (180), Standard.Character'Val (181),
 286      Standard.Character'Val (182), Standard.Character'Val (183),
 287      Standard.Character'Val (184), Standard.Character'Val (185),
 288      Standard.Character'Val (186), Standard.Character'Val (187),
 289      Standard.Character'Val (188), Standard.Character'Val (189),
 290      Standard.Character'Val (190), Standard.Character'Val (191),
 291      Standard.Character'Val (192), Standard.Character'Val (193),
 292      Standard.Character'Val (194), Standard.Character'Val (195),
 293      Standard.Character'Val (196), Standard.Character'Val (197),
 294      Standard.Character'Val (198), Standard.Character'Val (199),
 295      Standard.Character'Val (200), Standard.Character'Val (201),
 296      Standard.Character'Val (202), Standard.Character'Val (203),
 297      Standard.Character'Val (204), Standard.Character'Val (205),
 298      Standard.Character'Val (206), Standard.Character'Val (207),
 299      Standard.Character'Val (208), Standard.Character'Val (209),
 300      Standard.Character'Val (210), Standard.Character'Val (211),
 301      Standard.Character'Val (212), Standard.Character'Val (213),
 302      Standard.Character'Val (214), Standard.Character'Val (215),
 303      Standard.Character'Val (216), Standard.Character'Val (217),
 304      Standard.Character'Val (218), Standard.Character'Val (219),
 305      Standard.Character'Val (220), Standard.Character'Val (221),
 306      Standard.Character'Val (222), Standard.Character'Val (223),
 307      Standard.Character'Val (224), Standard.Character'Val (225),
 308      Standard.Character'Val (226), Standard.Character'Val (227),
 309      Standard.Character'Val (228), Standard.Character'Val (229),
 310      Standard.Character'Val (230), Standard.Character'Val (231),
 311      Standard.Character'Val (232), Standard.Character'Val (233),
 312      Standard.Character'Val (234), Standard.Character'Val (235),
 313      Standard.Character'Val (236), Standard.Character'Val (237),
 314      Standard.Character'Val (238), Standard.Character'Val (239),
 315      Standard.Character'Val (240), Standard.Character'Val (241),
 316      Standard.Character'Val (242), Standard.Character'Val (243),
 317      Standard.Character'Val (244), Standard.Character'Val (245),
 318      Standard.Character'Val (246), Standard.Character'Val (247),
 319      Standard.Character'Val (248), Standard.Character'Val (249),
 320      Standard.Character'Val (250), Standard.Character'Val (251),
 321      Standard.Character'Val (252), Standard.Character'Val (253),
 322      Standard.Character'Val (254), Standard.Character'Val (255));
 323
 324    type Alphanumeric is array (Positive range <>) of COBOL_Character;
 325    --  pragma Pack (Alphanumeric);
 326
 327    function To_COBOL (Item : String) return Alphanumeric;
 328    function To_Ada   (Item : Alphanumeric) return String;
 329
 330    procedure To_COBOL
 331      (Item   : String;
 332       Target : out Alphanumeric;
 333       Last   : out Natural);
 334
 335    procedure To_Ada
 336      (Item   : Alphanumeric;
 337       Target : out String;
 338       Last   : out Natural);
 339
 340    type Numeric is array (Positive range <>) of COBOL_Character;
 341    --  pragma Pack (Numeric);
 342
 343    --------------------------------------------
 344    -- Formats For COBOL Data Representations --
 345    --------------------------------------------
 346
 347    type Display_Format is private;
 348
 349    Unsigned             : constant Display_Format;
 350    Leading_Separate     : constant Display_Format;
 351    Trailing_Separate    : constant Display_Format;
 352    Leading_Nonseparate  : constant Display_Format;
 353    Trailing_Nonseparate : constant Display_Format;
 354
 355    type Binary_Format is private;
 356
 357    High_Order_First          : constant Binary_Format;
 358    Low_Order_First           : constant Binary_Format;
 359    Native_Binary             : constant Binary_Format;
 360    High_Order_First_Unsigned : constant Binary_Format;
 361    Low_Order_First_Unsigned  : constant Binary_Format;
 362    Native_Binary_Unsigned    : constant Binary_Format;
 363
 364    type Packed_Format is private;
 365
 366    Packed_Unsigned   : constant Packed_Format;
 367    Packed_Signed     : constant Packed_Format;
 368
 369    ------------------------------------------------------------
 370    -- Types For External Representation Of COBOL Binary Data --
 371    ------------------------------------------------------------
 372
 373    type Byte is mod 2 ** COBOL_Character'Size;
 374    type Byte_Array is array (Positive range <>) of Byte;
 375    --  pragma Pack (Byte_Array);
 376
 377    Conversion_Error : exception;
 378
 379    generic
 380       type Num is delta <> digits <>;
 381
 382    package Decimal_Conversions is
 383
 384       --  Display Formats: data values are represented as Numeric
 385
 386       function Valid
 387         (Item   : Numeric;
 388          Format : Display_Format) return Boolean;
 389
 390       function Length
 391         (Format : Display_Format) return Natural;
 392
 393       function To_Decimal
 394         (Item   : Numeric;
 395          Format : Display_Format)
 396          return   Num;
 397
 398       function To_Display
 399         (Item   : Num;
 400          Format : Display_Format) return Numeric;
 401
 402       --  Packed Formats: data values are represented as Packed_Decimal
 403
 404       function Valid
 405         (Item   : Packed_Decimal;
 406          Format : Packed_Format) return Boolean;
 407
 408       function Length
 409         (Format : Packed_Format) return Natural;
 410
 411       function To_Decimal
 412         (Item   : Packed_Decimal;
 413          Format : Packed_Format) return Num;
 414
 415       function To_Packed
 416         (Item   : Num;
 417          Format : Packed_Format) return Packed_Decimal;
 418
 419       --  Binary Formats: external data values are represented as Byte_Array
 420
 421       function Valid
 422         (Item   : Byte_Array;
 423          Format : Binary_Format) return Boolean;
 424
 425       function Length
 426         (Format : Binary_Format)
 427          return   Natural;
 428
 429       function To_Decimal
 430         (Item   : Byte_Array;
 431          Format : Binary_Format) return Num;
 432
 433       function To_Binary
 434         (Item   : Num;
 435          Format : Binary_Format) return Byte_Array;
 436
 437       --  Internal Binary formats: data values are of type Binary/Long_Binary
 438
 439       function To_Decimal (Item : Binary)      return Num;
 440       function To_Decimal (Item : Long_Binary) return Num;
 441
 442       function To_Binary      (Item : Num) return Binary;
 443       function To_Long_Binary (Item : Num) return Long_Binary;
 444
 445    private
 446       pragma Inline (Length);
 447       pragma Inline (To_Binary);
 448       pragma Inline (To_Decimal);
 449       pragma Inline (To_Display);
 450       pragma Inline (To_Long_Binary);
 451       pragma Inline (Valid);
 452
 453    end Decimal_Conversions;
 454
 455    ------------------------------------------
 456    -- Implementation Dependent Definitions --
 457    ------------------------------------------
 458
 459    --  The implementation dependent definitions are wholly contained in the
 460    --  private part of this spec (the body is implementation independent)
 461
 462 private
 463    -------------------
 464    -- Binary Format --
 465    -------------------
 466
 467    type Binary_Format is (H, L, N, HU, LU, NU);
 468
 469    subtype Binary_Unsigned_Format is Binary_Format range HU .. NU;
 470
 471    High_Order_First          : constant Binary_Format := H;
 472    Low_Order_First           : constant Binary_Format := L;
 473    Native_Binary             : constant Binary_Format := N;
 474    High_Order_First_Unsigned : constant Binary_Format := HU;
 475    Low_Order_First_Unsigned  : constant Binary_Format := LU;
 476    Native_Binary_Unsigned    : constant Binary_Format := NU;
 477
 478    ---------------------------
 479    -- Packed Decimal Format --
 480    ---------------------------
 481
 482    --  Packed decimal numbers use the IBM mainframe format:
 483
 484    --     dd dd ... dd dd ds
 485
 486    --  where d are the Digits, in natural left to right order, and s is
 487    --  the sign digit. If the number of Digits os even, then the high
 488    --  order (leftmost) Digits is always a 0. For example, a six digit
 489    --  number has the format:
 490
 491    --     0d dd dd ds
 492
 493    --  The sign digit has the possible values
 494
 495    --     16#0A#     non-standard plus sign
 496    --     16#0B#     non-standard minus sign
 497    --     16#0C#     standard plus sign
 498    --     16#0D#     standard minus sign
 499    --     16#0E#     non-standard plus sign
 500    --     16#0F#     standard unsigned sign
 501
 502    --  The non-standard signs are recognized on input, but never generated
 503    --  for output numbers. The 16#0F# distinguishes unsigned numbers from
 504    --  signed positive numbers, but is treated as positive for computational
 505    --  purposes. This format provides distinguished positive and negative
 506    --  zero values, which behave the same in all operations.
 507
 508    type Packed_Format is (U, S);
 509
 510    Packed_Unsigned : constant Packed_Format := U;
 511    Packed_Signed   : constant Packed_Format := S;
 512
 513    type Packed_Representation_Type is (IBM);
 514    --  Indicator for format used for packed decimal
 515
 516    Packed_Representation : constant Packed_Representation_Type := IBM;
 517    --  This version of the spec uses IBM internal format, as described above
 518
 519    -----------------------------
 520    -- Display Decimal Formats --
 521    -----------------------------
 522
 523    --  Display numbers are stored in standard ASCII format, as ASCII strings.
 524    --  For the embedded signs, the following codes are used:
 525
 526    --     0-9 positive:  16#30# .. 16#39# (i.e. natural ASCII digit code)
 527    --     0-9 negative:  16#20# .. 16#29# (ASCII digit code - 16#10#)
 528
 529    type Display_Format is (U, LS, TS, LN, TN);
 530
 531    Unsigned             : constant Display_Format := U;
 532    Leading_Separate     : constant Display_Format := LS;
 533    Trailing_Separate    : constant Display_Format := TS;
 534    Leading_Nonseparate  : constant Display_Format := LN;
 535    Trailing_Nonseparate : constant Display_Format := TN;
 536
 537    subtype COBOL_Digits is COBOL_Character range '0' .. '9';
 538    --  Digit values in display decimal
 539
 540    COBOL_Space : constant COBOL_Character := ' ';
 541    COBOL_Plus  : constant COBOL_Character := '+';
 542    COBOL_Minus : constant COBOL_Character := '-';
 543    --  Sign values for Leading_Separate and Trailing_Separate formats
 544
 545    subtype COBOL_Plus_Digits is COBOL_Character
 546      range COBOL_Character'Val (16#30#) .. COBOL_Character'Val (16#39#);
 547    --  Values used for embedded plus signs in nonseparate formats
 548
 549    subtype COBOL_Minus_Digits is COBOL_Character
 550      range COBOL_Character'Val (16#20#) .. COBOL_Character'Val (16#29#);
 551    --  Values used for embedded minus signs in nonseparate formats
 552
 553 end Interfaces.COBOL;