1------------------------------------------------------------------------------ 2-- -- 3-- GNAT RUN-TIME COMPONENTS -- 4-- -- 5-- A D A . T E X T _ I O -- 6-- -- 7-- B o d y -- 8-- -- 9-- Copyright (C) 1992-2015, Free Software Foundation, Inc. -- 10-- -- 11-- GNAT is free software; you can redistribute it and/or modify it under -- 12-- terms of the GNU General Public License as published by the Free Soft- -- 13-- ware Foundation; either version 3, or (at your option) any later ver- -- 14-- sion. GNAT is distributed in the hope that it will be useful, but WITH- -- 15-- OUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY -- 16-- or FITNESS FOR A PARTICULAR PURPOSE. -- 17-- -- 18-- As a special exception under Section 7 of GPL version 3, you are granted -- 19-- additional permissions described in the GCC Runtime Library Exception, -- 20-- version 3.1, as published by the Free Software Foundation. -- 21-- -- 22-- You should have received a copy of the GNU General Public License and -- 23-- a copy of the GCC Runtime Library Exception along with this program; -- 24-- see the files COPYING3 and COPYING.RUNTIME respectively. If not, see -- 25-- <http://www.gnu.org/licenses/>. -- 26-- -- 27-- GNAT was originally developed by the GNAT team at New York University. -- 28-- Extensive contributions were provided by Ada Core Technologies Inc. -- 29-- -- 30------------------------------------------------------------------------------ 31 32with Ada.Streams; use Ada.Streams; 33with Interfaces.C_Streams; use Interfaces.C_Streams; 34 35with System.File_IO; 36with System.CRTL; 37with System.WCh_Cnv; use System.WCh_Cnv; 38with System.WCh_Con; use System.WCh_Con; 39 40with Ada.Unchecked_Conversion; 41with Ada.Unchecked_Deallocation; 42 43pragma Elaborate_All (System.File_IO); 44-- Needed because of calls to Chain_File in package body elaboration 45 46package body Ada.Text_IO is 47 48 package FIO renames System.File_IO; 49 50 subtype AP is FCB.AFCB_Ptr; 51 52 function To_FCB is new Ada.Unchecked_Conversion (File_Mode, FCB.File_Mode); 53 function To_TIO is new Ada.Unchecked_Conversion (FCB.File_Mode, File_Mode); 54 use type FCB.File_Mode; 55 56 use type System.CRTL.size_t; 57 58 WC_Encoding : Character; 59 pragma Import (C, WC_Encoding, "__gl_wc_encoding"); 60 -- Default wide character encoding 61 62 Err_Name : aliased String := "*stderr" & ASCII.NUL; 63 In_Name : aliased String := "*stdin" & ASCII.NUL; 64 Out_Name : aliased String := "*stdout" & ASCII.NUL; 65 -- Names of standard files 66 -- 67 -- Use "preallocated" strings to avoid calling "new" during the elaboration 68 -- of the run time. This is needed in the tasking case to avoid calling 69 -- Task_Lock too early. A filename is expected to end with a null character 70 -- in the runtime, here the null characters are added just to have a 71 -- correct filename length. 72 -- 73 -- Note: the names for these files are bogus, and probably it would be 74 -- better for these files to have no names, but the ACVC tests insist. 75 -- We use names that are bound to fail in open etc. 76 77 Null_Str : aliased constant String := ""; 78 -- Used as form string for standard files 79 80 ----------------------- 81 -- Local Subprograms -- 82 ----------------------- 83 84 function Get_Upper_Half_Char 85 (C : Character; 86 File : File_Type) return Character; 87 -- This function is shared by Get and Get_Immediate to extract an encoded 88 -- upper half character value from the given File. The first byte has 89 -- already been read and is passed in C. The character value is returned as 90 -- the result, and the file pointer is bumped past the character. 91 -- Constraint_Error is raised if the encoded value is outside the bounds of 92 -- type Character. 93 94 function Get_Upper_Half_Char_Immed 95 (C : Character; 96 File : File_Type) return Character; 97 -- This routine is identical to Get_Upper_Half_Char, except that the reads 98 -- are done in Get_Immediate mode (i.e. without waiting for a line return). 99 100 function Getc (File : File_Type) return int; 101 -- Gets next character from file, which has already been checked for being 102 -- in read status, and returns the character read if no error occurs. The 103 -- result is EOF if the end of file was read. 104 105 function Getc_Immed (File : File_Type) return int; 106 -- This routine is identical to Getc, except that the read is done in 107 -- Get_Immediate mode (i.e. without waiting for a line return). 108 109 function Has_Upper_Half_Character (Item : String) return Boolean; 110 -- Returns True if any of the characters is in the range 16#80#-16#FF# 111 112 function Nextc (File : File_Type) return int; 113 -- Returns next character from file without skipping past it (i.e. it is a 114 -- combination of Getc followed by an Ungetc). 115 116 procedure Put_Encoded (File : File_Type; Char : Character); 117 -- Called to output a character Char to the given File, when the encoding 118 -- method for the file is other than brackets, and Char is upper half. 119 120 procedure Putc (ch : int; File : File_Type); 121 -- Outputs the given character to the file, which has already been checked 122 -- for being in output status. Device_Error is raised if the character 123 -- cannot be written. 124 125 procedure Set_WCEM (File : in out File_Type); 126 -- Called by Open and Create to set the wide character encoding method for 127 -- the file, processing a WCEM form parameter if one is present. File is 128 -- IN OUT because it may be closed in case of an error. 129 130 procedure Terminate_Line (File : File_Type); 131 -- If the file is in Write_File or Append_File mode, and the current line 132 -- is not terminated, then a line terminator is written using New_Line. 133 -- Note that there is no Terminate_Page routine, because the page mark at 134 -- the end of the file is implied if necessary. 135 136 procedure Ungetc (ch : int; File : File_Type); 137 -- Pushes back character into stream, using ungetc. The caller has checked 138 -- that the file is in read status. Device_Error is raised if the character 139 -- cannot be pushed back. An attempt to push back and end of file character 140 -- (EOF) is ignored. 141 142 ------------------- 143 -- AFCB_Allocate -- 144 ------------------- 145 146 function AFCB_Allocate (Control_Block : Text_AFCB) return FCB.AFCB_Ptr is 147 pragma Unreferenced (Control_Block); 148 begin 149 return new Text_AFCB; 150 end AFCB_Allocate; 151 152 ---------------- 153 -- AFCB_Close -- 154 ---------------- 155 156 procedure AFCB_Close (File : not null access Text_AFCB) is 157 begin 158 -- If the file being closed is one of the current files, then close 159 -- the corresponding current file. It is not clear that this action 160 -- is required (RM A.10.3(23)) but it seems reasonable, and besides 161 -- ACVC test CE3208A expects this behavior. 162 163 if File_Type (File) = Current_In then 164 Current_In := null; 165 elsif File_Type (File) = Current_Out then 166 Current_Out := null; 167 elsif File_Type (File) = Current_Err then 168 Current_Err := null; 169 end if; 170 171 Terminate_Line (File_Type (File)); 172 end AFCB_Close; 173 174 --------------- 175 -- AFCB_Free -- 176 --------------- 177 178 procedure AFCB_Free (File : not null access Text_AFCB) is 179 type FCB_Ptr is access all Text_AFCB; 180 FT : FCB_Ptr := FCB_Ptr (File); 181 182 procedure Free is new Ada.Unchecked_Deallocation (Text_AFCB, FCB_Ptr); 183 184 begin 185 Free (FT); 186 end AFCB_Free; 187 188 ----------- 189 -- Close -- 190 ----------- 191 192 procedure Close (File : in out File_Type) is 193 begin 194 FIO.Close (AP (File)'Unrestricted_Access); 195 end Close; 196 197 --------- 198 -- Col -- 199 --------- 200 201 -- Note: we assume that it is impossible in practice for the column 202 -- to exceed the value of Count'Last, i.e. no check is required for 203 -- overflow raising layout error. 204 205 function Col (File : File_Type) return Positive_Count is 206 begin 207 FIO.Check_File_Open (AP (File)); 208 return File.Col; 209 end Col; 210 211 function Col return Positive_Count is 212 begin 213 return Col (Current_Out); 214 end Col; 215 216 ------------ 217 -- Create -- 218 ------------ 219 220 procedure Create 221 (File : in out File_Type; 222 Mode : File_Mode := Out_File; 223 Name : String := ""; 224 Form : String := "") 225 is 226 Dummy_File_Control_Block : Text_AFCB; 227 pragma Warnings (Off, Dummy_File_Control_Block); 228 -- Yes, we know this is never assigned a value, only the tag 229 -- is used for dispatching purposes, so that's expected. 230 231 begin 232 FIO.Open (File_Ptr => AP (File), 233 Dummy_FCB => Dummy_File_Control_Block, 234 Mode => To_FCB (Mode), 235 Name => Name, 236 Form => Form, 237 Amethod => 'T', 238 Creat => True, 239 Text => True); 240 241 File.Self := File; 242 Set_WCEM (File); 243 end Create; 244 245 ------------------- 246 -- Current_Error -- 247 ------------------- 248 249 function Current_Error return File_Type is 250 begin 251 return Current_Err; 252 end Current_Error; 253 254 function Current_Error return File_Access is 255 begin 256 return Current_Err.Self'Access; 257 end Current_Error; 258 259 ------------------- 260 -- Current_Input -- 261 ------------------- 262 263 function Current_Input return File_Type is 264 begin 265 return Current_In; 266 end Current_Input; 267 268 function Current_Input return File_Access is 269 begin 270 return Current_In.Self'Access; 271 end Current_Input; 272 273 -------------------- 274 -- Current_Output -- 275 -------------------- 276 277 function Current_Output return File_Type is 278 begin 279 return Current_Out; 280 end Current_Output; 281 282 function Current_Output return File_Access is 283 begin 284 return Current_Out.Self'Access; 285 end Current_Output; 286 287 ------------ 288 -- Delete -- 289 ------------ 290 291 procedure Delete (File : in out File_Type) is 292 begin 293 FIO.Delete (AP (File)'Unrestricted_Access); 294 end Delete; 295 296 ----------------- 297 -- End_Of_File -- 298 ----------------- 299 300 function End_Of_File (File : File_Type) return Boolean is 301 ch : int; 302 303 begin 304 FIO.Check_Read_Status (AP (File)); 305 306 if File.Before_Upper_Half_Character then 307 return False; 308 309 elsif File.Before_LM then 310 if File.Before_LM_PM then 311 return Nextc (File) = EOF; 312 end if; 313 314 else 315 ch := Getc (File); 316 317 if ch = EOF then 318 return True; 319 320 elsif ch /= LM then 321 Ungetc (ch, File); 322 return False; 323 324 else -- ch = LM 325 File.Before_LM := True; 326 end if; 327 end if; 328 329 -- Here we are just past the line mark with Before_LM set so that we 330 -- do not have to try to back up past the LM, thus avoiding the need 331 -- to back up more than one character. 332 333 ch := Getc (File); 334 335 if ch = EOF then 336 return True; 337 338 elsif ch = PM and then File.Is_Regular_File then 339 File.Before_LM_PM := True; 340 return Nextc (File) = EOF; 341 342 -- Here if neither EOF nor PM followed end of line 343 344 else 345 Ungetc (ch, File); 346 return False; 347 end if; 348 349 end End_Of_File; 350 351 function End_Of_File return Boolean is 352 begin 353 return End_Of_File (Current_In); 354 end End_Of_File; 355 356 ----------------- 357 -- End_Of_Line -- 358 ----------------- 359 360 function End_Of_Line (File : File_Type) return Boolean is 361 ch : int; 362 363 begin 364 FIO.Check_Read_Status (AP (File)); 365 366 if File.Before_Upper_Half_Character then 367 return False; 368 369 elsif File.Before_LM then 370 return True; 371 372 else 373 ch := Getc (File); 374 375 if ch = EOF then 376 return True; 377 378 else 379 Ungetc (ch, File); 380 return (ch = LM); 381 end if; 382 end if; 383 end End_Of_Line; 384 385 function End_Of_Line return Boolean is 386 begin 387 return End_Of_Line (Current_In); 388 end End_Of_Line; 389 390 ----------------- 391 -- End_Of_Page -- 392 ----------------- 393 394 function End_Of_Page (File : File_Type) return Boolean is 395 ch : int; 396 397 begin 398 FIO.Check_Read_Status (AP (File)); 399 400 if not File.Is_Regular_File then 401 return False; 402 403 elsif File.Before_Upper_Half_Character then 404 return False; 405 406 elsif File.Before_LM then 407 if File.Before_LM_PM then 408 return True; 409 end if; 410 411 else 412 ch := Getc (File); 413 414 if ch = EOF then 415 return True; 416 417 elsif ch /= LM then 418 Ungetc (ch, File); 419 return False; 420 421 else -- ch = LM 422 File.Before_LM := True; 423 end if; 424 end if; 425 426 -- Here we are just past the line mark with Before_LM set so that we 427 -- do not have to try to back up past the LM, thus avoiding the need 428 -- to back up more than one character. 429 430 ch := Nextc (File); 431 432 return ch = PM or else ch = EOF; 433 end End_Of_Page; 434 435 function End_Of_Page return Boolean is 436 begin 437 return End_Of_Page (Current_In); 438 end End_Of_Page; 439 440 -------------- 441 -- EOF_Char -- 442 -------------- 443 444 function EOF_Char return Integer is 445 begin 446 return EOF; 447 end EOF_Char; 448 449 ----------- 450 -- Flush -- 451 ----------- 452 453 procedure Flush (File : File_Type) is 454 begin 455 FIO.Flush (AP (File)); 456 end Flush; 457 458 procedure Flush is 459 begin 460 Flush (Current_Out); 461 end Flush; 462 463 ---------- 464 -- Form -- 465 ---------- 466 467 function Form (File : File_Type) return String is 468 begin 469 return FIO.Form (AP (File)); 470 end Form; 471 472 --------- 473 -- Get -- 474 --------- 475 476 procedure Get 477 (File : File_Type; 478 Item : out Character) 479 is 480 ch : int; 481 482 begin 483 FIO.Check_Read_Status (AP (File)); 484 485 if File.Before_Upper_Half_Character then 486 File.Before_Upper_Half_Character := False; 487 Item := File.Saved_Upper_Half_Character; 488 489 elsif File.Before_LM then 490 File.Before_LM := False; 491 File.Col := 1; 492 493 if File.Before_LM_PM then 494 File.Line := 1; 495 File.Page := File.Page + 1; 496 File.Before_LM_PM := False; 497 else 498 File.Line := File.Line + 1; 499 end if; 500 end if; 501 502 loop 503 ch := Getc (File); 504 505 if ch = EOF then 506 raise End_Error; 507 508 elsif ch = LM then 509 File.Line := File.Line + 1; 510 File.Col := 1; 511 512 elsif ch = PM and then File.Is_Regular_File then 513 File.Page := File.Page + 1; 514 File.Line := 1; 515 516 else 517 Item := Character'Val (ch); 518 File.Col := File.Col + 1; 519 return; 520 end if; 521 end loop; 522 end Get; 523 524 procedure Get (Item : out Character) is 525 begin 526 Get (Current_In, Item); 527 end Get; 528 529 procedure Get 530 (File : File_Type; 531 Item : out String) 532 is 533 ch : int; 534 J : Natural; 535 536 begin 537 FIO.Check_Read_Status (AP (File)); 538 539 if File.Before_LM then 540 File.Before_LM := False; 541 File.Before_LM_PM := False; 542 File.Col := 1; 543 544 if File.Before_LM_PM then 545 File.Line := 1; 546 File.Page := File.Page + 1; 547 File.Before_LM_PM := False; 548 549 else 550 File.Line := File.Line + 1; 551 end if; 552 end if; 553 554 J := Item'First; 555 while J <= Item'Last loop 556 ch := Getc (File); 557 558 if ch = EOF then 559 raise End_Error; 560 561 elsif ch = LM then 562 File.Line := File.Line + 1; 563 File.Col := 1; 564 565 elsif ch = PM and then File.Is_Regular_File then 566 File.Page := File.Page + 1; 567 File.Line := 1; 568 569 else 570 Item (J) := Character'Val (ch); 571 J := J + 1; 572 File.Col := File.Col + 1; 573 end if; 574 end loop; 575 end Get; 576 577 procedure Get (Item : out String) is 578 begin 579 Get (Current_In, Item); 580 end Get; 581 582 ------------------- 583 -- Get_Immediate -- 584 ------------------- 585 586 procedure Get_Immediate 587 (File : File_Type; 588 Item : out Character) 589 is 590 ch : int; 591 592 begin 593 FIO.Check_Read_Status (AP (File)); 594 595 if File.Before_Upper_Half_Character then 596 File.Before_Upper_Half_Character := False; 597 Item := File.Saved_Upper_Half_Character; 598 599 elsif File.Before_LM then 600 File.Before_LM := False; 601 File.Before_LM_PM := False; 602 Item := Character'Val (LM); 603 604 else 605 ch := Getc_Immed (File); 606 607 if ch = EOF then 608 raise End_Error; 609 else 610 Item := 611 (if not Is_Start_Of_Encoding (Character'Val (ch), File.WC_Method) 612 then Character'Val (ch) 613 else Get_Upper_Half_Char_Immed (Character'Val (ch), File)); 614 end if; 615 end if; 616 end Get_Immediate; 617 618 procedure Get_Immediate 619 (Item : out Character) 620 is 621 begin 622 Get_Immediate (Current_In, Item); 623 end Get_Immediate; 624 625 procedure Get_Immediate 626 (File : File_Type; 627 Item : out Character; 628 Available : out Boolean) 629 is 630 ch : int; 631 end_of_file : int; 632 avail : int; 633 634 procedure getc_immediate_nowait 635 (stream : FILEs; 636 ch : out int; 637 end_of_file : out int; 638 avail : out int); 639 pragma Import (C, getc_immediate_nowait, "getc_immediate_nowait"); 640 641 begin 642 FIO.Check_Read_Status (AP (File)); 643 Available := True; 644 645 if File.Before_Upper_Half_Character then 646 File.Before_Upper_Half_Character := False; 647 Item := File.Saved_Upper_Half_Character; 648 649 elsif File.Before_LM then 650 File.Before_LM := False; 651 File.Before_LM_PM := False; 652 Item := Character'Val (LM); 653 654 else 655 getc_immediate_nowait (File.Stream, ch, end_of_file, avail); 656 657 if ferror (File.Stream) /= 0 then 658 raise Device_Error; 659 660 elsif end_of_file /= 0 then 661 raise End_Error; 662 663 elsif avail = 0 then 664 Available := False; 665 Item := ASCII.NUL; 666 667 else 668 Available := True; 669 670 Item := 671 (if not Is_Start_Of_Encoding (Character'Val (ch), File.WC_Method) 672 then Character'Val (ch) 673 else Get_Upper_Half_Char_Immed (Character'Val (ch), File)); 674 end if; 675 end if; 676 677 end Get_Immediate; 678 679 procedure Get_Immediate 680 (Item : out Character; 681 Available : out Boolean) 682 is 683 begin 684 Get_Immediate (Current_In, Item, Available); 685 end Get_Immediate; 686 687 -------------- 688 -- Get_Line -- 689 -------------- 690 691 procedure Get_Line 692 (File : File_Type; 693 Item : out String; 694 Last : out Natural) is separate; 695 -- The implementation of Ada.Text_IO.Get_Line is split into a subunit so 696 -- that different implementations can be used on different systems. 697 698 procedure Get_Line 699 (Item : out String; 700 Last : out Natural) 701 is 702 begin 703 Get_Line (Current_In, Item, Last); 704 end Get_Line; 705 706 function Get_Line (File : File_Type) return String is 707 Buffer : String (1 .. 500); 708 Last : Natural; 709 710 function Get_Rest (S : String) return String; 711 -- This is a recursive function that reads the rest of the line and 712 -- returns it. S is the part read so far. 713 714 -------------- 715 -- Get_Rest -- 716 -------------- 717 718 function Get_Rest (S : String) return String is 719 720 -- Each time we allocate a buffer the same size as what we have 721 -- read so far. This limits us to a logarithmic number of calls 722 -- to Get_Rest and also ensures only a linear use of stack space. 723 724 Buffer : String (1 .. S'Length); 725 Last : Natural; 726 727 begin 728 Get_Line (File, Buffer, Last); 729 730 declare 731 R : constant String := S & Buffer (1 .. Last); 732 begin 733 if Last < Buffer'Last then 734 return R; 735 else 736 return Get_Rest (R); 737 end if; 738 end; 739 end Get_Rest; 740 741 -- Start of processing for Get_Line 742 743 begin 744 Get_Line (File, Buffer, Last); 745 746 if Last < Buffer'Last then 747 return Buffer (1 .. Last); 748 else 749 return Get_Rest (Buffer (1 .. Last)); 750 end if; 751 end Get_Line; 752 753 function Get_Line return String is 754 begin 755 return Get_Line (Current_In); 756 end Get_Line; 757 758 ------------------------- 759 -- Get_Upper_Half_Char -- 760 ------------------------- 761 762 function Get_Upper_Half_Char 763 (C : Character; 764 File : File_Type) return Character 765 is 766 Result : Wide_Character; 767 768 function In_Char return Character; 769 -- Function used to obtain additional characters it the wide character 770 -- sequence is more than one character long. 771 772 function WC_In is new Char_Sequence_To_Wide_Char (In_Char); 773 774 ------------- 775 -- In_Char -- 776 ------------- 777 778 function In_Char return Character is 779 ch : constant Integer := Getc (File); 780 begin 781 if ch = EOF then 782 raise End_Error; 783 else 784 return Character'Val (ch); 785 end if; 786 end In_Char; 787 788 -- Start of processing for Get_Upper_Half_Char 789 790 begin 791 Result := WC_In (C, File.WC_Method); 792 793 if Wide_Character'Pos (Result) > 16#FF# then 794 raise Constraint_Error with 795 "invalid wide character in Text_'I'O input"; 796 else 797 return Character'Val (Wide_Character'Pos (Result)); 798 end if; 799 end Get_Upper_Half_Char; 800 801 ------------------------------- 802 -- Get_Upper_Half_Char_Immed -- 803 ------------------------------- 804 805 function Get_Upper_Half_Char_Immed 806 (C : Character; 807 File : File_Type) return Character 808 is 809 Result : Wide_Character; 810 811 function In_Char return Character; 812 -- Function used to obtain additional characters it the wide character 813 -- sequence is more than one character long. 814 815 function WC_In is new Char_Sequence_To_Wide_Char (In_Char); 816 817 ------------- 818 -- In_Char -- 819 ------------- 820 821 function In_Char return Character is 822 ch : constant Integer := Getc_Immed (File); 823 begin 824 if ch = EOF then 825 raise End_Error; 826 else 827 return Character'Val (ch); 828 end if; 829 end In_Char; 830 831 -- Start of processing for Get_Upper_Half_Char_Immed 832 833 begin 834 Result := WC_In (C, File.WC_Method); 835 836 if Wide_Character'Pos (Result) > 16#FF# then 837 raise Constraint_Error with 838 "invalid wide character in Text_'I'O input"; 839 else 840 return Character'Val (Wide_Character'Pos (Result)); 841 end if; 842 end Get_Upper_Half_Char_Immed; 843 844 ---------- 845 -- Getc -- 846 ---------- 847 848 function Getc (File : File_Type) return int is 849 ch : int; 850 851 begin 852 ch := fgetc (File.Stream); 853 854 if ch = EOF and then ferror (File.Stream) /= 0 then 855 raise Device_Error; 856 else 857 return ch; 858 end if; 859 end Getc; 860 861 ---------------- 862 -- Getc_Immed -- 863 ---------------- 864 865 function Getc_Immed (File : File_Type) return int is 866 ch : int; 867 end_of_file : int; 868 869 procedure getc_immediate 870 (stream : FILEs; ch : out int; end_of_file : out int); 871 pragma Import (C, getc_immediate, "getc_immediate"); 872 873 begin 874 FIO.Check_Read_Status (AP (File)); 875 876 if File.Before_LM then 877 File.Before_LM := False; 878 File.Before_LM_PM := False; 879 ch := LM; 880 881 else 882 getc_immediate (File.Stream, ch, end_of_file); 883 884 if ferror (File.Stream) /= 0 then 885 raise Device_Error; 886 elsif end_of_file /= 0 then 887 return EOF; 888 end if; 889 end if; 890 891 return ch; 892 end Getc_Immed; 893 894 ------------------------------ 895 -- Has_Upper_Half_Character -- 896 ------------------------------ 897 898 function Has_Upper_Half_Character (Item : String) return Boolean is 899 begin 900 for J in Item'Range loop 901 if Character'Pos (Item (J)) >= 16#80# then 902 return True; 903 end if; 904 end loop; 905 906 return False; 907 end Has_Upper_Half_Character; 908 909 ------------------------------- 910 -- Initialize_Standard_Files -- 911 ------------------------------- 912 913 procedure Initialize_Standard_Files is 914 begin 915 Standard_Err.Stream := stderr; 916 Standard_Err.Name := Err_Name'Access; 917 Standard_Err.Form := Null_Str'Unrestricted_Access; 918 Standard_Err.Mode := FCB.Out_File; 919 Standard_Err.Is_Regular_File := is_regular_file (fileno (stderr)) /= 0; 920 Standard_Err.Is_Temporary_File := False; 921 Standard_Err.Is_System_File := True; 922 Standard_Err.Text_Encoding := Default_Text; 923 Standard_Err.Access_Method := 'T'; 924 Standard_Err.Self := Standard_Err; 925 Standard_Err.WC_Method := Default_WCEM; 926 927 Standard_In.Stream := stdin; 928 Standard_In.Name := In_Name'Access; 929 Standard_In.Form := Null_Str'Unrestricted_Access; 930 Standard_In.Mode := FCB.In_File; 931 Standard_In.Is_Regular_File := is_regular_file (fileno (stdin)) /= 0; 932 Standard_In.Is_Temporary_File := False; 933 Standard_In.Is_System_File := True; 934 Standard_In.Text_Encoding := Default_Text; 935 Standard_In.Access_Method := 'T'; 936 Standard_In.Self := Standard_In; 937 Standard_In.WC_Method := Default_WCEM; 938 939 Standard_Out.Stream := stdout; 940 Standard_Out.Name := Out_Name'Access; 941 Standard_Out.Form := Null_Str'Unrestricted_Access; 942 Standard_Out.Mode := FCB.Out_File; 943 Standard_Out.Is_Regular_File := is_regular_file (fileno (stdout)) /= 0; 944 Standard_Out.Is_Temporary_File := False; 945 Standard_Out.Is_System_File := True; 946 Standard_Out.Text_Encoding := Default_Text; 947 Standard_Out.Access_Method := 'T'; 948 Standard_Out.Self := Standard_Out; 949 Standard_Out.WC_Method := Default_WCEM; 950 951 FIO.Make_Unbuffered (AP (Standard_Out)); 952 FIO.Make_Unbuffered (AP (Standard_Err)); 953 end Initialize_Standard_Files; 954 955 ------------- 956 -- Is_Open -- 957 ------------- 958 959 function Is_Open (File : File_Type) return Boolean is 960 begin 961 return FIO.Is_Open (AP (File)); 962 end Is_Open; 963 964 ---------- 965 -- Line -- 966 ---------- 967 968 -- Note: we assume that it is impossible in practice for the line 969 -- to exceed the value of Count'Last, i.e. no check is required for 970 -- overflow raising layout error. 971 972 function Line (File : File_Type) return Positive_Count is 973 begin 974 FIO.Check_File_Open (AP (File)); 975 return File.Line; 976 end Line; 977 978 function Line return Positive_Count is 979 begin 980 return Line (Current_Out); 981 end Line; 982 983 ----------------- 984 -- Line_Length -- 985 ----------------- 986 987 function Line_Length (File : File_Type) return Count is 988 begin 989 FIO.Check_Write_Status (AP (File)); 990 return File.Line_Length; 991 end Line_Length; 992 993 function Line_Length return Count is 994 begin 995 return Line_Length (Current_Out); 996 end Line_Length; 997 998 ---------------- 999 -- Look_Ahead -- 1000 ---------------- 1001 1002 procedure Look_Ahead 1003 (File : File_Type; 1004 Item : out Character; 1005 End_Of_Line : out Boolean) 1006 is 1007 ch : int; 1008 1009 begin 1010 FIO.Check_Read_Status (AP (File)); 1011 1012 -- If we are logically before a line mark, we can return immediately 1013 1014 if File.Before_LM then 1015 End_Of_Line := True; 1016 Item := ASCII.NUL; 1017 1018 -- If we are before an upper half character just return it (this can 1019 -- happen if there are two calls to Look_Ahead in a row). 1020 1021 elsif File.Before_Upper_Half_Character then 1022 End_Of_Line := False; 1023 Item := File.Saved_Upper_Half_Character; 1024 1025 -- Otherwise we must read a character from the input stream 1026 1027 else 1028 ch := Getc (File); 1029 1030 if ch = LM 1031 or else ch = EOF 1032 or else (ch = PM and then File.Is_Regular_File) 1033 then 1034 End_Of_Line := True; 1035 Ungetc (ch, File); 1036 Item := ASCII.NUL; 1037 1038 -- Case where character obtained does not represent the start of an 1039 -- encoded sequence so it stands for itself and we can unget it with 1040 -- no difficulty. 1041 1042 elsif not Is_Start_Of_Encoding 1043 (Character'Val (ch), File.WC_Method) 1044 then 1045 End_Of_Line := False; 1046 Ungetc (ch, File); 1047 Item := Character'Val (ch); 1048 1049 -- For the start of an encoding, we read the character using the 1050 -- Get_Upper_Half_Char routine. It will occupy more than one byte 1051 -- so we can't put it back with ungetc. Instead we save it in the 1052 -- control block, setting a flag that everyone interested in reading 1053 -- characters must test before reading the stream. 1054 1055 else 1056 Item := Get_Upper_Half_Char (Character'Val (ch), File); 1057 End_Of_Line := False; 1058 File.Saved_Upper_Half_Character := Item; 1059 File.Before_Upper_Half_Character := True; 1060 end if; 1061 end if; 1062 end Look_Ahead; 1063 1064 procedure Look_Ahead 1065 (Item : out Character; 1066 End_Of_Line : out Boolean) 1067 is 1068 begin 1069 Look_Ahead (Current_In, Item, End_Of_Line); 1070 end Look_Ahead; 1071 1072 ---------- 1073 -- Mode -- 1074 ---------- 1075 1076 function Mode (File : File_Type) return File_Mode is 1077 begin 1078 return To_TIO (FIO.Mode (AP (File))); 1079 end Mode; 1080 1081 ---------- 1082 -- Name -- 1083 ---------- 1084 1085 function Name (File : File_Type) return String is 1086 begin 1087 return FIO.Name (AP (File)); 1088 end Name; 1089 1090 -------------- 1091 -- New_Line -- 1092 -------------- 1093 1094 procedure New_Line 1095 (File : File_Type; 1096 Spacing : Positive_Count := 1) 1097 is 1098 begin 1099 -- Raise Constraint_Error if out of range value. The reason for this 1100 -- explicit test is that we don't want junk values around, even if 1101 -- checks are off in the caller. 1102 1103 if not Spacing'Valid then 1104 raise Constraint_Error; 1105 end if; 1106 1107 FIO.Check_Write_Status (AP (File)); 1108 1109 for K in 1 .. Spacing loop 1110 Putc (LM, File); 1111 File.Line := File.Line + 1; 1112 1113 if File.Page_Length /= 0 1114 and then File.Line > File.Page_Length 1115 then 1116 Putc (PM, File); 1117 File.Line := 1; 1118 File.Page := File.Page + 1; 1119 end if; 1120 end loop; 1121 1122 File.Col := 1; 1123 end New_Line; 1124 1125 procedure New_Line (Spacing : Positive_Count := 1) is 1126 begin 1127 New_Line (Current_Out, Spacing); 1128 end New_Line; 1129 1130 -------------- 1131 -- New_Page -- 1132 -------------- 1133 1134 procedure New_Page (File : File_Type) is 1135 begin 1136 FIO.Check_Write_Status (AP (File)); 1137 1138 if File.Col /= 1 or else File.Line = 1 then 1139 Putc (LM, File); 1140 end if; 1141 1142 Putc (PM, File); 1143 File.Page := File.Page + 1; 1144 File.Line := 1; 1145 File.Col := 1; 1146 end New_Page; 1147 1148 procedure New_Page is 1149 begin 1150 New_Page (Current_Out); 1151 end New_Page; 1152 1153 ----------- 1154 -- Nextc -- 1155 ----------- 1156 1157 function Nextc (File : File_Type) return int is 1158 ch : int; 1159 1160 begin 1161 ch := fgetc (File.Stream); 1162 1163 if ch = EOF then 1164 if ferror (File.Stream) /= 0 then 1165 raise Device_Error; 1166 end if; 1167 1168 else 1169 if ungetc (ch, File.Stream) = EOF then 1170 raise Device_Error; 1171 end if; 1172 end if; 1173 1174 return ch; 1175 end Nextc; 1176 1177 ---------- 1178 -- Open -- 1179 ---------- 1180 1181 procedure Open 1182 (File : in out File_Type; 1183 Mode : File_Mode; 1184 Name : String; 1185 Form : String := "") 1186 is 1187 Dummy_File_Control_Block : Text_AFCB; 1188 pragma Warnings (Off, Dummy_File_Control_Block); 1189 -- Yes, we know this is never assigned a value, only the tag 1190 -- is used for dispatching purposes, so that's expected. 1191 1192 begin 1193 FIO.Open (File_Ptr => AP (File), 1194 Dummy_FCB => Dummy_File_Control_Block, 1195 Mode => To_FCB (Mode), 1196 Name => Name, 1197 Form => Form, 1198 Amethod => 'T', 1199 Creat => False, 1200 Text => True); 1201 1202 File.Self := File; 1203 Set_WCEM (File); 1204 end Open; 1205 1206 ---------- 1207 -- Page -- 1208 ---------- 1209 1210 -- Note: we assume that it is impossible in practice for the page 1211 -- to exceed the value of Count'Last, i.e. no check is required for 1212 -- overflow raising layout error. 1213 1214 function Page (File : File_Type) return Positive_Count is 1215 begin 1216 FIO.Check_File_Open (AP (File)); 1217 return File.Page; 1218 end Page; 1219 1220 function Page return Positive_Count is 1221 begin 1222 return Page (Current_Out); 1223 end Page; 1224 1225 ----------------- 1226 -- Page_Length -- 1227 ----------------- 1228 1229 function Page_Length (File : File_Type) return Count is 1230 begin 1231 FIO.Check_Write_Status (AP (File)); 1232 return File.Page_Length; 1233 end Page_Length; 1234 1235 function Page_Length return Count is 1236 begin 1237 return Page_Length (Current_Out); 1238 end Page_Length; 1239 1240 --------- 1241 -- Put -- 1242 --------- 1243 1244 procedure Put 1245 (File : File_Type; 1246 Item : Character) 1247 is 1248 begin 1249 FIO.Check_Write_Status (AP (File)); 1250 1251 if File.Line_Length /= 0 and then File.Col > File.Line_Length then 1252 New_Line (File); 1253 end if; 1254 1255 -- If lower half character, or brackets encoding, output directly 1256 1257 if Character'Pos (Item) < 16#80# 1258 or else File.WC_Method = WCEM_Brackets 1259 then 1260 if fputc (Character'Pos (Item), File.Stream) = EOF then 1261 raise Device_Error; 1262 end if; 1263 1264 -- Case of upper half character with non-brackets encoding 1265 1266 else 1267 Put_Encoded (File, Item); 1268 end if; 1269 1270 File.Col := File.Col + 1; 1271 end Put; 1272 1273 procedure Put (Item : Character) is 1274 begin 1275 Put (Current_Out, Item); 1276 end Put; 1277 1278 --------- 1279 -- Put -- 1280 --------- 1281 1282 procedure Put 1283 (File : File_Type; 1284 Item : String) 1285 is 1286 begin 1287 FIO.Check_Write_Status (AP (File)); 1288 1289 -- Only have something to do if string is non-null 1290 1291 if Item'Length > 0 then 1292 1293 -- If we have bounded lines, or if the file encoding is other than 1294 -- Brackets and the string has at least one upper half character, 1295 -- then output the string character by character. 1296 1297 if File.Line_Length /= 0 1298 or else (File.WC_Method /= WCEM_Brackets 1299 and then Has_Upper_Half_Character (Item)) 1300 then 1301 for J in Item'Range loop 1302 Put (File, Item (J)); 1303 end loop; 1304 1305 -- Otherwise we can output the entire string at once. Note that if 1306 -- there are LF or FF characters in the string, we do not bother to 1307 -- count them as line or page terminators. 1308 1309 else 1310 FIO.Write_Buf (AP (File), Item'Address, Item'Length); 1311 File.Col := File.Col + Item'Length; 1312 end if; 1313 end if; 1314 end Put; 1315 1316 procedure Put (Item : String) is 1317 begin 1318 Put (Current_Out, Item); 1319 end Put; 1320 1321 ----------------- 1322 -- Put_Encoded -- 1323 ----------------- 1324 1325 procedure Put_Encoded (File : File_Type; Char : Character) is 1326 procedure Out_Char (C : Character); 1327 -- Procedure to output one character of an upper half encoded sequence 1328 1329 procedure WC_Out is new Wide_Char_To_Char_Sequence (Out_Char); 1330 1331 -------------- 1332 -- Out_Char -- 1333 -------------- 1334 1335 procedure Out_Char (C : Character) is 1336 begin 1337 Putc (Character'Pos (C), File); 1338 end Out_Char; 1339 1340 -- Start of processing for Put_Encoded 1341 1342 begin 1343 WC_Out (Wide_Character'Val (Character'Pos (Char)), File.WC_Method); 1344 end Put_Encoded; 1345 1346 -------------- 1347 -- Put_Line -- 1348 -------------- 1349 1350 procedure Put_Line 1351 (File : File_Type; 1352 Item : String) 1353 is 1354 Ilen : Natural := Item'Length; 1355 Istart : Natural := Item'First; 1356 1357 begin 1358 FIO.Check_Write_Status (AP (File)); 1359 1360 -- If we have bounded lines, or if the file encoding is other than 1361 -- Brackets and the string has at least one upper half character, then 1362 -- output the string character by character. 1363 1364 if File.Line_Length /= 0 1365 or else (File.WC_Method /= WCEM_Brackets 1366 and then Has_Upper_Half_Character (Item)) 1367 then 1368 for J in Item'Range loop 1369 Put (File, Item (J)); 1370 end loop; 1371 1372 New_Line (File); 1373 return; 1374 end if; 1375 1376 -- Normal case where we do not need to output character by character 1377 1378 -- We setup a single string that has the necessary terminators and 1379 -- then write it with a single call. The reason for doing this is 1380 -- that it gives better behavior for the use of Put_Line in multi- 1381 -- tasking programs, since often the OS will treat the entire put 1382 -- operation as an atomic operation. 1383 1384 -- We only do this if the message is 512 characters or less in length, 1385 -- since otherwise Put_Line would use an unbounded amount of stack 1386 -- space and could cause undetected stack overflow. If we have a 1387 -- longer string, then output the first part separately to avoid this. 1388 1389 if Ilen > 512 then 1390 FIO.Write_Buf (AP (File), Item'Address, size_t (Ilen - 512)); 1391 Istart := Istart + Ilen - 512; 1392 Ilen := 512; 1393 end if; 1394 1395 -- Now prepare the string with its terminator 1396 1397 declare 1398 Buffer : String (1 .. Ilen + 2); 1399 Plen : size_t; 1400 1401 begin 1402 Buffer (1 .. Ilen) := Item (Istart .. Item'Last); 1403 Buffer (Ilen + 1) := Character'Val (LM); 1404 1405 if File.Page_Length /= 0 1406 and then File.Line > File.Page_Length 1407 then 1408 Buffer (Ilen + 2) := Character'Val (PM); 1409 Plen := size_t (Ilen) + 2; 1410 File.Line := 1; 1411 File.Page := File.Page + 1; 1412 1413 else 1414 Plen := size_t (Ilen) + 1; 1415 File.Line := File.Line + 1; 1416 end if; 1417 1418 FIO.Write_Buf (AP (File), Buffer'Address, Plen); 1419 1420 File.Col := 1; 1421 end; 1422 end Put_Line; 1423 1424 procedure Put_Line (Item : String) is 1425 begin 1426 Put_Line (Current_Out, Item); 1427 end Put_Line; 1428 1429 ---------- 1430 -- Putc -- 1431 ---------- 1432 1433 procedure Putc (ch : int; File : File_Type) is 1434 begin 1435 if fputc (ch, File.Stream) = EOF then 1436 raise Device_Error; 1437 end if; 1438 end Putc; 1439 1440 ---------- 1441 -- Read -- 1442 ---------- 1443 1444 -- This is the primitive Stream Read routine, used when a Text_IO file 1445 -- is treated directly as a stream using Text_IO.Streams.Stream. 1446 1447 procedure Read 1448 (File : in out Text_AFCB; 1449 Item : out Stream_Element_Array; 1450 Last : out Stream_Element_Offset) 1451 is 1452 Discard_ch : int; 1453 pragma Warnings (Off, Discard_ch); 1454 1455 begin 1456 -- Need to deal with Before_Upper_Half_Character ??? 1457 1458 if File.Mode /= FCB.In_File then 1459 raise Mode_Error; 1460 end if; 1461 1462 -- Deal with case where our logical and physical position do not match 1463 -- because of being after an LM or LM-PM sequence when in fact we are 1464 -- logically positioned before it. 1465 1466 if File.Before_LM then 1467 1468 -- If we are before a PM, then it is possible for a stream read 1469 -- to leave us after the LM and before the PM, which is a bit 1470 -- odd. The easiest way to deal with this is to unget the PM, 1471 -- so we are indeed positioned between the characters. This way 1472 -- further stream read operations will work correctly, and the 1473 -- effect on text processing is a little weird, but what can 1474 -- be expected if stream and text input are mixed this way? 1475 1476 if File.Before_LM_PM then 1477 Discard_ch := ungetc (PM, File.Stream); 1478 File.Before_LM_PM := False; 1479 end if; 1480 1481 File.Before_LM := False; 1482 1483 Item (Item'First) := Stream_Element (Character'Pos (ASCII.LF)); 1484 1485 if Item'Length = 1 then 1486 Last := Item'Last; 1487 1488 else 1489 Last := 1490 Item'First + 1491 Stream_Element_Offset 1492 (fread (buffer => Item'Address, 1493 index => size_t (Item'First + 1), 1494 size => 1, 1495 count => Item'Length - 1, 1496 stream => File.Stream)); 1497 end if; 1498 1499 return; 1500 end if; 1501 1502 -- Now we do the read. Since this is a text file, it is normally in 1503 -- text mode, but stream data must be read in binary mode, so we 1504 -- temporarily set binary mode for the read, resetting it after. 1505 -- These calls have no effect in a system (like Unix) where there is 1506 -- no distinction between text and binary files. 1507 1508 set_binary_mode (fileno (File.Stream)); 1509 1510 Last := 1511 Item'First + 1512 Stream_Element_Offset 1513 (fread (Item'Address, 1, Item'Length, File.Stream)) - 1; 1514 1515 if Last < Item'Last then 1516 if ferror (File.Stream) /= 0 then 1517 raise Device_Error; 1518 end if; 1519 end if; 1520 1521 set_text_mode (fileno (File.Stream)); 1522 end Read; 1523 1524 ----------- 1525 -- Reset -- 1526 ----------- 1527 1528 procedure Reset 1529 (File : in out File_Type; 1530 Mode : File_Mode) 1531 is 1532 begin 1533 -- Don't allow change of mode for current file (RM A.10.2(5)) 1534 1535 if (File = Current_In or else 1536 File = Current_Out or else 1537 File = Current_Error) 1538 and then To_FCB (Mode) /= File.Mode 1539 then 1540 raise Mode_Error; 1541 end if; 1542 1543 Terminate_Line (File); 1544 FIO.Reset (AP (File)'Unrestricted_Access, To_FCB (Mode)); 1545 File.Page := 1; 1546 File.Line := 1; 1547 File.Col := 1; 1548 File.Line_Length := 0; 1549 File.Page_Length := 0; 1550 File.Before_LM := False; 1551 File.Before_LM_PM := False; 1552 end Reset; 1553 1554 procedure Reset (File : in out File_Type) is 1555 begin 1556 Terminate_Line (File); 1557 FIO.Reset (AP (File)'Unrestricted_Access); 1558 File.Page := 1; 1559 File.Line := 1; 1560 File.Col := 1; 1561 File.Line_Length := 0; 1562 File.Page_Length := 0; 1563 File.Before_LM := False; 1564 File.Before_LM_PM := False; 1565 end Reset; 1566 1567 ------------- 1568 -- Set_Col -- 1569 ------------- 1570 1571 procedure Set_Col 1572 (File : File_Type; 1573 To : Positive_Count) 1574 is 1575 ch : int; 1576 1577 begin 1578 -- Raise Constraint_Error if out of range value. The reason for this 1579 -- explicit test is that we don't want junk values around, even if 1580 -- checks are off in the caller. 1581 1582 if not To'Valid then 1583 raise Constraint_Error; 1584 end if; 1585 1586 FIO.Check_File_Open (AP (File)); 1587 1588 -- Output case 1589 1590 if Mode (File) >= Out_File then 1591 1592 -- Error if we attempt to set Col to a value greater than the 1593 -- maximum permissible line length. 1594 1595 if File.Line_Length /= 0 and then To > File.Line_Length then 1596 raise Layout_Error; 1597 end if; 1598 1599 -- If we are behind current position, then go to start of new line 1600 1601 if To < File.Col then 1602 New_Line (File); 1603 end if; 1604 1605 -- Loop to output blanks till we are at the required column 1606 1607 while File.Col < To loop 1608 Put (File, ' '); 1609 end loop; 1610 1611 -- Input case 1612 1613 else 1614 -- If we are logically before a LM, but physically after it, the 1615 -- file position still reflects the position before the LM, so eat 1616 -- it now and adjust the file position appropriately. 1617 1618 if File.Before_LM then 1619 File.Before_LM := False; 1620 File.Before_LM_PM := False; 1621 File.Line := File.Line + 1; 1622 File.Col := 1; 1623 end if; 1624 1625 -- Loop reading characters till we get one at the required Col value 1626 1627 loop 1628 -- Read next character. The reason we have to read ahead is to 1629 -- skip formatting characters, the effect of Set_Col is to set 1630 -- us to a real character with the right Col value, and format 1631 -- characters don't count. 1632 1633 ch := Getc (File); 1634 1635 -- Error if we hit an end of file 1636 1637 if ch = EOF then 1638 raise End_Error; 1639 1640 -- If line mark, eat it and adjust file position 1641 1642 elsif ch = LM then 1643 File.Line := File.Line + 1; 1644 File.Col := 1; 1645 1646 -- If recognized page mark, eat it, and adjust file position 1647 1648 elsif ch = PM and then File.Is_Regular_File then 1649 File.Page := File.Page + 1; 1650 File.Line := 1; 1651 File.Col := 1; 1652 1653 -- Otherwise this is the character we are looking for, so put it 1654 -- back in the input stream (we have not adjusted the file 1655 -- position yet, so everything is set right after this ungetc). 1656 1657 elsif To = File.Col then 1658 Ungetc (ch, File); 1659 return; 1660 1661 -- Keep skipping characters if we are not there yet, updating the 1662 -- file position past the skipped character. 1663 1664 else 1665 File.Col := File.Col + 1; 1666 end if; 1667 end loop; 1668 end if; 1669 end Set_Col; 1670 1671 procedure Set_Col (To : Positive_Count) is 1672 begin 1673 Set_Col (Current_Out, To); 1674 end Set_Col; 1675 1676 --------------- 1677 -- Set_Error -- 1678 --------------- 1679 1680 procedure Set_Error (File : File_Type) is 1681 begin 1682 FIO.Check_Write_Status (AP (File)); 1683 Current_Err := File; 1684 end Set_Error; 1685 1686 --------------- 1687 -- Set_Input -- 1688 --------------- 1689 1690 procedure Set_Input (File : File_Type) is 1691 begin 1692 FIO.Check_Read_Status (AP (File)); 1693 Current_In := File; 1694 end Set_Input; 1695 1696 -------------- 1697 -- Set_Line -- 1698 -------------- 1699 1700 procedure Set_Line 1701 (File : File_Type; 1702 To : Positive_Count) 1703 is 1704 begin 1705 -- Raise Constraint_Error if out of range value. The reason for this 1706 -- explicit test is that we don't want junk values around, even if 1707 -- checks are off in the caller. 1708 1709 if not To'Valid then 1710 raise Constraint_Error; 1711 end if; 1712 1713 FIO.Check_File_Open (AP (File)); 1714 1715 if To = File.Line then 1716 return; 1717 end if; 1718 1719 if Mode (File) >= Out_File then 1720 if File.Page_Length /= 0 and then To > File.Page_Length then 1721 raise Layout_Error; 1722 end if; 1723 1724 if To < File.Line then 1725 New_Page (File); 1726 end if; 1727 1728 while File.Line < To loop 1729 New_Line (File); 1730 end loop; 1731 1732 else 1733 while To /= File.Line loop 1734 Skip_Line (File); 1735 end loop; 1736 end if; 1737 end Set_Line; 1738 1739 procedure Set_Line (To : Positive_Count) is 1740 begin 1741 Set_Line (Current_Out, To); 1742 end Set_Line; 1743 1744 --------------------- 1745 -- Set_Line_Length -- 1746 --------------------- 1747 1748 procedure Set_Line_Length (File : File_Type; To : Count) is 1749 begin 1750 -- Raise Constraint_Error if out of range value. The reason for this 1751 -- explicit test is that we don't want junk values around, even if 1752 -- checks are off in the caller. 1753 1754 if not To'Valid then 1755 raise Constraint_Error; 1756 end if; 1757 1758 FIO.Check_Write_Status (AP (File)); 1759 File.Line_Length := To; 1760 end Set_Line_Length; 1761 1762 procedure Set_Line_Length (To : Count) is 1763 begin 1764 Set_Line_Length (Current_Out, To); 1765 end Set_Line_Length; 1766 1767 ---------------- 1768 -- Set_Output -- 1769 ---------------- 1770 1771 procedure Set_Output (File : File_Type) is 1772 begin 1773 FIO.Check_Write_Status (AP (File)); 1774 Current_Out := File; 1775 end Set_Output; 1776 1777 --------------------- 1778 -- Set_Page_Length -- 1779 --------------------- 1780 1781 procedure Set_Page_Length (File : File_Type; To : Count) is 1782 begin 1783 -- Raise Constraint_Error if out of range value. The reason for this 1784 -- explicit test is that we don't want junk values around, even if 1785 -- checks are off in the caller. 1786 1787 if not To'Valid then 1788 raise Constraint_Error; 1789 end if; 1790 1791 FIO.Check_Write_Status (AP (File)); 1792 File.Page_Length := To; 1793 end Set_Page_Length; 1794 1795 procedure Set_Page_Length (To : Count) is 1796 begin 1797 Set_Page_Length (Current_Out, To); 1798 end Set_Page_Length; 1799 1800 -------------- 1801 -- Set_WCEM -- 1802 -------------- 1803 1804 procedure Set_WCEM (File : in out File_Type) is 1805 Start : Natural; 1806 Stop : Natural; 1807 1808 begin 1809 File.WC_Method := WCEM_Brackets; 1810 FIO.Form_Parameter (File.Form.all, "wcem", Start, Stop); 1811 1812 if Start = 0 then 1813 File.WC_Method := WCEM_Brackets; 1814 1815 else 1816 if Stop = Start then 1817 for J in WC_Encoding_Letters'Range loop 1818 if File.Form (Start) = WC_Encoding_Letters (J) then 1819 File.WC_Method := J; 1820 return; 1821 end if; 1822 end loop; 1823 end if; 1824 1825 Close (File); 1826 raise Use_Error with "invalid WCEM form parameter"; 1827 end if; 1828 end Set_WCEM; 1829 1830 --------------- 1831 -- Skip_Line -- 1832 --------------- 1833 1834 procedure Skip_Line 1835 (File : File_Type; 1836 Spacing : Positive_Count := 1) 1837 is 1838 ch : int; 1839 1840 begin 1841 -- Raise Constraint_Error if out of range value. The reason for this 1842 -- explicit test is that we don't want junk values around, even if 1843 -- checks are off in the caller. 1844 1845 if not Spacing'Valid then 1846 raise Constraint_Error; 1847 end if; 1848 1849 FIO.Check_Read_Status (AP (File)); 1850 1851 for L in 1 .. Spacing loop 1852 if File.Before_LM then 1853 File.Before_LM := False; 1854 1855 -- Note that if File.Before_LM_PM is currently set, we also have 1856 -- to reset it (because it makes sense for Before_LM_PM to be set 1857 -- only when Before_LM is also set). This is done later on in this 1858 -- subprogram, as soon as Before_LM_PM has been taken into account 1859 -- for the purpose of page and line counts. 1860 1861 else 1862 ch := Getc (File); 1863 1864 -- If at end of file now, then immediately raise End_Error. Note 1865 -- that we can never be positioned between a line mark and a page 1866 -- mark, so if we are at the end of file, we cannot logically be 1867 -- before the implicit page mark that is at the end of the file. 1868 1869 -- For the same reason, we do not need an explicit check for a 1870 -- page mark. If there is a FF in the middle of a line, the file 1871 -- is not in canonical format and we do not care about the page 1872 -- numbers for files other than ones in canonical format. 1873 1874 if ch = EOF then 1875 raise End_Error; 1876 end if; 1877 1878 -- If not at end of file, then loop till we get to an LM or EOF. 1879 -- The latter case happens only in non-canonical files where the 1880 -- last line is not terminated by LM, but we don't want to blow 1881 -- up for such files, so we assume an implicit LM in this case. 1882 1883 loop 1884 exit when ch = LM or else ch = EOF; 1885 ch := Getc (File); 1886 end loop; 1887 end if; 1888 1889 -- We have got past a line mark, now, for a regular file only, 1890 -- see if a page mark immediately follows this line mark and 1891 -- if so, skip past the page mark as well. We do not do this 1892 -- for non-regular files, since it would cause an undesirable 1893 -- wait for an additional character. 1894 1895 File.Col := 1; 1896 File.Line := File.Line + 1; 1897 1898 if File.Before_LM_PM then 1899 File.Page := File.Page + 1; 1900 File.Line := 1; 1901 File.Before_LM_PM := False; 1902 1903 elsif File.Is_Regular_File then 1904 ch := Getc (File); 1905 1906 -- Page mark can be explicit, or implied at the end of the file 1907 1908 if (ch = PM or else ch = EOF) 1909 and then File.Is_Regular_File 1910 then 1911 File.Page := File.Page + 1; 1912 File.Line := 1; 1913 else 1914 Ungetc (ch, File); 1915 end if; 1916 end if; 1917 end loop; 1918 1919 File.Before_Upper_Half_Character := False; 1920 end Skip_Line; 1921 1922 procedure Skip_Line (Spacing : Positive_Count := 1) is 1923 begin 1924 Skip_Line (Current_In, Spacing); 1925 end Skip_Line; 1926 1927 --------------- 1928 -- Skip_Page -- 1929 --------------- 1930 1931 procedure Skip_Page (File : File_Type) is 1932 ch : int; 1933 1934 begin 1935 FIO.Check_Read_Status (AP (File)); 1936 1937 -- If at page mark already, just skip it 1938 1939 if File.Before_LM_PM then 1940 File.Before_LM := False; 1941 File.Before_LM_PM := False; 1942 File.Page := File.Page + 1; 1943 File.Line := 1; 1944 File.Col := 1; 1945 return; 1946 end if; 1947 1948 -- This is a bit tricky, if we are logically before an LM then 1949 -- it is not an error if we are at an end of file now, since we 1950 -- are not really at it. 1951 1952 if File.Before_LM then 1953 File.Before_LM := False; 1954 File.Before_LM_PM := False; 1955 ch := Getc (File); 1956 1957 -- Otherwise we do raise End_Error if we are at the end of file now 1958 1959 else 1960 ch := Getc (File); 1961 1962 if ch = EOF then 1963 raise End_Error; 1964 end if; 1965 end if; 1966 1967 -- Now we can just rumble along to the next page mark, or to the 1968 -- end of file, if that comes first. The latter case happens when 1969 -- the page mark is implied at the end of file. 1970 1971 loop 1972 exit when ch = EOF 1973 or else (ch = PM and then File.Is_Regular_File); 1974 ch := Getc (File); 1975 end loop; 1976 1977 File.Page := File.Page + 1; 1978 File.Line := 1; 1979 File.Col := 1; 1980 File.Before_Upper_Half_Character := False; 1981 end Skip_Page; 1982 1983 procedure Skip_Page is 1984 begin 1985 Skip_Page (Current_In); 1986 end Skip_Page; 1987 1988 -------------------- 1989 -- Standard_Error -- 1990 -------------------- 1991 1992 function Standard_Error return File_Type is 1993 begin 1994 return Standard_Err; 1995 end Standard_Error; 1996 1997 function Standard_Error return File_Access is 1998 begin 1999 return Standard_Err'Access; 2000 end Standard_Error; 2001 2002 -------------------- 2003 -- Standard_Input -- 2004 -------------------- 2005 2006 function Standard_Input return File_Type is 2007 begin 2008 return Standard_In; 2009 end Standard_Input; 2010 2011 function Standard_Input return File_Access is 2012 begin 2013 return Standard_In'Access; 2014 end Standard_Input; 2015 2016 --------------------- 2017 -- Standard_Output -- 2018 --------------------- 2019 2020 function Standard_Output return File_Type is 2021 begin 2022 return Standard_Out; 2023 end Standard_Output; 2024 2025 function Standard_Output return File_Access is 2026 begin 2027 return Standard_Out'Access; 2028 end Standard_Output; 2029 2030 -------------------- 2031 -- Terminate_Line -- 2032 -------------------- 2033 2034 procedure Terminate_Line (File : File_Type) is 2035 begin 2036 FIO.Check_File_Open (AP (File)); 2037 2038 -- For file other than In_File, test for needing to terminate last line 2039 2040 if Mode (File) /= In_File then 2041 2042 -- If not at start of line definition need new line 2043 2044 if File.Col /= 1 then 2045 New_Line (File); 2046 2047 -- For files other than standard error and standard output, we 2048 -- make sure that an empty file has a single line feed, so that 2049 -- it is properly formatted. We avoid this for the standard files 2050 -- because it is too much of a nuisance to have these odd line 2051 -- feeds when nothing has been written to the file. 2052 2053 -- We also avoid this for files opened in append mode, in 2054 -- accordance with (RM A.8.2(10)) 2055 2056 elsif (File /= Standard_Err and then File /= Standard_Out) 2057 and then (File.Line = 1 and then File.Page = 1) 2058 and then Mode (File) = Out_File 2059 then 2060 New_Line (File); 2061 end if; 2062 end if; 2063 end Terminate_Line; 2064 2065 ------------ 2066 -- Ungetc -- 2067 ------------ 2068 2069 procedure Ungetc (ch : int; File : File_Type) is 2070 begin 2071 if ch /= EOF then 2072 if ungetc (ch, File.Stream) = EOF then 2073 raise Device_Error; 2074 end if; 2075 end if; 2076 end Ungetc; 2077 2078 ----------- 2079 -- Write -- 2080 ----------- 2081 2082 -- This is the primitive Stream Write routine, used when a Text_IO file 2083 -- is treated directly as a stream using Text_IO.Streams.Stream. 2084 2085 procedure Write 2086 (File : in out Text_AFCB; 2087 Item : Stream_Element_Array) 2088 is 2089 pragma Warnings (Off, File); 2090 -- Because in this implementation we don't need IN OUT, we only read 2091 2092 function Has_Translated_Characters return Boolean; 2093 -- return True if Item array contains a character which will be 2094 -- translated under the text file mode. There is only one such 2095 -- character under DOS based systems which is character 10. 2096 2097 text_translation_required : Boolean; 2098 for text_translation_required'Size use Character'Size; 2099 pragma Import (C, text_translation_required, 2100 "__gnat_text_translation_required"); 2101 2102 Siz : constant size_t := Item'Length; 2103 2104 ------------------------------- 2105 -- Has_Translated_Characters -- 2106 ------------------------------- 2107 2108 function Has_Translated_Characters return Boolean is 2109 begin 2110 for K in Item'Range loop 2111 if Item (K) = 10 then 2112 return True; 2113 end if; 2114 end loop; 2115 return False; 2116 end Has_Translated_Characters; 2117 2118 Needs_Binary_Write : constant Boolean := 2119 text_translation_required and then Has_Translated_Characters; 2120 2121 -- Start of processing for Write 2122 2123 begin 2124 if File.Mode = FCB.In_File then 2125 raise Mode_Error; 2126 end if; 2127 2128 -- Now we do the write. Since this is a text file, it is normally in 2129 -- text mode, but stream data must be written in binary mode, so we 2130 -- temporarily set binary mode for the write, resetting it after. This 2131 -- is done only if needed (i.e. there is some characters in Item which 2132 -- needs to be written using the binary mode). 2133 -- These calls have no effect in a system (like Unix) where there is 2134 -- no distinction between text and binary files. 2135 2136 -- Since the character translation is done at the time the buffer is 2137 -- written (this is true under Windows) we first flush current buffer 2138 -- with text mode if needed. 2139 2140 if Needs_Binary_Write then 2141 if fflush (File.Stream) = -1 then 2142 raise Device_Error; 2143 end if; 2144 2145 set_binary_mode (fileno (File.Stream)); 2146 end if; 2147 2148 if fwrite (Item'Address, 1, Siz, File.Stream) /= Siz then 2149 raise Device_Error; 2150 end if; 2151 2152 -- At this point we need to flush the buffer using the binary mode then 2153 -- we reset to text mode. 2154 2155 if Needs_Binary_Write then 2156 if fflush (File.Stream) = -1 then 2157 raise Device_Error; 2158 end if; 2159 2160 set_text_mode (fileno (File.Stream)); 2161 end if; 2162 end Write; 2163 2164begin 2165 -- Initialize Standard Files 2166 2167 for J in WC_Encoding_Method loop 2168 if WC_Encoding = WC_Encoding_Letters (J) then 2169 Default_WCEM := J; 2170 end if; 2171 end loop; 2172 2173 Initialize_Standard_Files; 2174 2175 FIO.Chain_File (AP (Standard_In)); 2176 FIO.Chain_File (AP (Standard_Out)); 2177 FIO.Chain_File (AP (Standard_Err)); 2178 2179end Ada.Text_IO; 2180