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) 1992-2013, 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 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. In 697 -- particular the standard implementation uses low level stuff that is 698 -- not appropriate for the JVM and .NET implementations. 699 700 procedure Get_Line 701 (Item : out String; 702 Last : out Natural) 703 is 704 begin 705 Get_Line (Current_In, Item, Last); 706 end Get_Line; 707 708 function Get_Line (File : File_Type) return String is 709 Buffer : String (1 .. 500); 710 Last : Natural; 711 712 function Get_Rest (S : String) return String; 713 -- This is a recursive function that reads the rest of the line and 714 -- returns it. S is the part read so far. 715 716 -------------- 717 -- Get_Rest -- 718 -------------- 719 720 function Get_Rest (S : String) return String is 721 722 -- Each time we allocate a buffer the same size as what we have 723 -- read so far. This limits us to a logarithmic number of calls 724 -- to Get_Rest and also ensures only a linear use of stack space. 725 726 Buffer : String (1 .. S'Length); 727 Last : Natural; 728 729 begin 730 Get_Line (File, Buffer, Last); 731 732 declare 733 R : constant String := S & Buffer (1 .. Last); 734 begin 735 if Last < Buffer'Last then 736 return R; 737 else 738 return Get_Rest (R); 739 end if; 740 end; 741 end Get_Rest; 742 743 -- Start of processing for Get_Line 744 745 begin 746 Get_Line (File, Buffer, Last); 747 748 if Last < Buffer'Last then 749 return Buffer (1 .. Last); 750 else 751 return Get_Rest (Buffer (1 .. Last)); 752 end if; 753 end Get_Line; 754 755 function Get_Line return String is 756 begin 757 return Get_Line (Current_In); 758 end Get_Line; 759 760 ------------------------- 761 -- Get_Upper_Half_Char -- 762 ------------------------- 763 764 function Get_Upper_Half_Char 765 (C : Character; 766 File : File_Type) return Character 767 is 768 Result : Wide_Character; 769 770 function In_Char return Character; 771 -- Function used to obtain additional characters it the wide character 772 -- sequence is more than one character long. 773 774 function WC_In is new Char_Sequence_To_Wide_Char (In_Char); 775 776 ------------- 777 -- In_Char -- 778 ------------- 779 780 function In_Char return Character is 781 ch : constant Integer := Getc (File); 782 begin 783 if ch = EOF then 784 raise End_Error; 785 else 786 return Character'Val (ch); 787 end if; 788 end In_Char; 789 790 -- Start of processing for Get_Upper_Half_Char 791 792 begin 793 Result := WC_In (C, File.WC_Method); 794 795 if Wide_Character'Pos (Result) > 16#FF# then 796 raise Constraint_Error with 797 "invalid wide character in Text_'I'O input"; 798 else 799 return Character'Val (Wide_Character'Pos (Result)); 800 end if; 801 end Get_Upper_Half_Char; 802 803 ------------------------------- 804 -- Get_Upper_Half_Char_Immed -- 805 ------------------------------- 806 807 function Get_Upper_Half_Char_Immed 808 (C : Character; 809 File : File_Type) return Character 810 is 811 Result : Wide_Character; 812 813 function In_Char return Character; 814 -- Function used to obtain additional characters it the wide character 815 -- sequence is more than one character long. 816 817 function WC_In is new Char_Sequence_To_Wide_Char (In_Char); 818 819 ------------- 820 -- In_Char -- 821 ------------- 822 823 function In_Char return Character is 824 ch : constant Integer := Getc_Immed (File); 825 begin 826 if ch = EOF then 827 raise End_Error; 828 else 829 return Character'Val (ch); 830 end if; 831 end In_Char; 832 833 -- Start of processing for Get_Upper_Half_Char_Immed 834 835 begin 836 Result := WC_In (C, File.WC_Method); 837 838 if Wide_Character'Pos (Result) > 16#FF# then 839 raise Constraint_Error with 840 "invalid wide character in Text_'I'O input"; 841 else 842 return Character'Val (Wide_Character'Pos (Result)); 843 end if; 844 end Get_Upper_Half_Char_Immed; 845 846 ---------- 847 -- Getc -- 848 ---------- 849 850 function Getc (File : File_Type) return int is 851 ch : int; 852 853 begin 854 ch := fgetc (File.Stream); 855 856 if ch = EOF and then ferror (File.Stream) /= 0 then 857 raise Device_Error; 858 else 859 return ch; 860 end if; 861 end Getc; 862 863 ---------------- 864 -- Getc_Immed -- 865 ---------------- 866 867 function Getc_Immed (File : File_Type) return int is 868 ch : int; 869 end_of_file : int; 870 871 procedure getc_immediate 872 (stream : FILEs; ch : out int; end_of_file : out int); 873 pragma Import (C, getc_immediate, "getc_immediate"); 874 875 begin 876 FIO.Check_Read_Status (AP (File)); 877 878 if File.Before_LM then 879 File.Before_LM := False; 880 File.Before_LM_PM := False; 881 ch := LM; 882 883 else 884 getc_immediate (File.Stream, ch, end_of_file); 885 886 if ferror (File.Stream) /= 0 then 887 raise Device_Error; 888 elsif end_of_file /= 0 then 889 return EOF; 890 end if; 891 end if; 892 893 return ch; 894 end Getc_Immed; 895 896 ------------------------------ 897 -- Has_Upper_Half_Character -- 898 ------------------------------ 899 900 function Has_Upper_Half_Character (Item : String) return Boolean is 901 begin 902 for J in Item'Range loop 903 if Character'Pos (Item (J)) >= 16#80# then 904 return True; 905 end if; 906 end loop; 907 908 return False; 909 end Has_Upper_Half_Character; 910 911 ------------------------------- 912 -- Initialize_Standard_Files -- 913 ------------------------------- 914 915 procedure Initialize_Standard_Files is 916 begin 917 Standard_Err.Stream := stderr; 918 Standard_Err.Name := Err_Name'Access; 919 Standard_Err.Form := Null_Str'Unrestricted_Access; 920 Standard_Err.Mode := FCB.Out_File; 921 Standard_Err.Is_Regular_File := is_regular_file (fileno (stderr)) /= 0; 922 Standard_Err.Is_Temporary_File := False; 923 Standard_Err.Is_System_File := True; 924 Standard_Err.Is_Text_File := True; 925 Standard_Err.Access_Method := 'T'; 926 Standard_Err.Self := Standard_Err; 927 Standard_Err.WC_Method := Default_WCEM; 928 929 Standard_In.Stream := stdin; 930 Standard_In.Name := In_Name'Access; 931 Standard_In.Form := Null_Str'Unrestricted_Access; 932 Standard_In.Mode := FCB.In_File; 933 Standard_In.Is_Regular_File := is_regular_file (fileno (stdin)) /= 0; 934 Standard_In.Is_Temporary_File := False; 935 Standard_In.Is_System_File := True; 936 Standard_In.Is_Text_File := True; 937 Standard_In.Access_Method := 'T'; 938 Standard_In.Self := Standard_In; 939 Standard_In.WC_Method := Default_WCEM; 940 941 Standard_Out.Stream := stdout; 942 Standard_Out.Name := Out_Name'Access; 943 Standard_Out.Form := Null_Str'Unrestricted_Access; 944 Standard_Out.Mode := FCB.Out_File; 945 Standard_Out.Is_Regular_File := is_regular_file (fileno (stdout)) /= 0; 946 Standard_Out.Is_Temporary_File := False; 947 Standard_Out.Is_System_File := True; 948 Standard_Out.Is_Text_File := True; 949 Standard_Out.Access_Method := 'T'; 950 Standard_Out.Self := Standard_Out; 951 Standard_Out.WC_Method := Default_WCEM; 952 953 FIO.Make_Unbuffered (AP (Standard_Out)); 954 FIO.Make_Unbuffered (AP (Standard_Err)); 955 end Initialize_Standard_Files; 956 957 ------------- 958 -- Is_Open -- 959 ------------- 960 961 function Is_Open (File : File_Type) return Boolean is 962 begin 963 return FIO.Is_Open (AP (File)); 964 end Is_Open; 965 966 ---------- 967 -- Line -- 968 ---------- 969 970 -- Note: we assume that it is impossible in practice for the line 971 -- to exceed the value of Count'Last, i.e. no check is required for 972 -- overflow raising layout error. 973 974 function Line (File : File_Type) return Positive_Count is 975 begin 976 FIO.Check_File_Open (AP (File)); 977 return File.Line; 978 end Line; 979 980 function Line return Positive_Count is 981 begin 982 return Line (Current_Out); 983 end Line; 984 985 ----------------- 986 -- Line_Length -- 987 ----------------- 988 989 function Line_Length (File : File_Type) return Count is 990 begin 991 FIO.Check_Write_Status (AP (File)); 992 return File.Line_Length; 993 end Line_Length; 994 995 function Line_Length return Count is 996 begin 997 return Line_Length (Current_Out); 998 end Line_Length; 999 1000 ---------------- 1001 -- Look_Ahead -- 1002 ---------------- 1003 1004 procedure Look_Ahead 1005 (File : File_Type; 1006 Item : out Character; 1007 End_Of_Line : out Boolean) 1008 is 1009 ch : int; 1010 1011 begin 1012 FIO.Check_Read_Status (AP (File)); 1013 1014 -- If we are logically before a line mark, we can return immediately 1015 1016 if File.Before_LM then 1017 End_Of_Line := True; 1018 Item := ASCII.NUL; 1019 1020 -- If we are before an upper half character just return it (this can 1021 -- happen if there are two calls to Look_Ahead in a row). 1022 1023 elsif File.Before_Upper_Half_Character then 1024 End_Of_Line := False; 1025 Item := File.Saved_Upper_Half_Character; 1026 1027 -- Otherwise we must read a character from the input stream 1028 1029 else 1030 ch := Getc (File); 1031 1032 if ch = LM 1033 or else ch = EOF 1034 or else (ch = PM and then File.Is_Regular_File) 1035 then 1036 End_Of_Line := True; 1037 Ungetc (ch, File); 1038 Item := ASCII.NUL; 1039 1040 -- Case where character obtained does not represent the start of an 1041 -- encoded sequence so it stands for itself and we can unget it with 1042 -- no difficulty. 1043 1044 elsif not Is_Start_Of_Encoding 1045 (Character'Val (ch), File.WC_Method) 1046 then 1047 End_Of_Line := False; 1048 Ungetc (ch, File); 1049 Item := Character'Val (ch); 1050 1051 -- For the start of an encoding, we read the character using the 1052 -- Get_Upper_Half_Char routine. It will occupy more than one byte 1053 -- so we can't put it back with ungetc. Instead we save it in the 1054 -- control block, setting a flag that everyone interested in reading 1055 -- characters must test before reading the stream. 1056 1057 else 1058 Item := Get_Upper_Half_Char (Character'Val (ch), File); 1059 End_Of_Line := False; 1060 File.Saved_Upper_Half_Character := Item; 1061 File.Before_Upper_Half_Character := True; 1062 end if; 1063 end if; 1064 end Look_Ahead; 1065 1066 procedure Look_Ahead 1067 (Item : out Character; 1068 End_Of_Line : out Boolean) 1069 is 1070 begin 1071 Look_Ahead (Current_In, Item, End_Of_Line); 1072 end Look_Ahead; 1073 1074 ---------- 1075 -- Mode -- 1076 ---------- 1077 1078 function Mode (File : File_Type) return File_Mode is 1079 begin 1080 return To_TIO (FIO.Mode (AP (File))); 1081 end Mode; 1082 1083 ---------- 1084 -- Name -- 1085 ---------- 1086 1087 function Name (File : File_Type) return String is 1088 begin 1089 return FIO.Name (AP (File)); 1090 end Name; 1091 1092 -------------- 1093 -- New_Line -- 1094 -------------- 1095 1096 procedure New_Line 1097 (File : File_Type; 1098 Spacing : Positive_Count := 1) 1099 is 1100 begin 1101 -- Raise Constraint_Error if out of range value. The reason for this 1102 -- explicit test is that we don't want junk values around, even if 1103 -- checks are off in the caller. 1104 1105 if not Spacing'Valid then 1106 raise Constraint_Error; 1107 end if; 1108 1109 FIO.Check_Write_Status (AP (File)); 1110 1111 for K in 1 .. Spacing loop 1112 Putc (LM, File); 1113 File.Line := File.Line + 1; 1114 1115 if File.Page_Length /= 0 1116 and then File.Line > File.Page_Length 1117 then 1118 Putc (PM, File); 1119 File.Line := 1; 1120 File.Page := File.Page + 1; 1121 end if; 1122 end loop; 1123 1124 File.Col := 1; 1125 end New_Line; 1126 1127 procedure New_Line (Spacing : Positive_Count := 1) is 1128 begin 1129 New_Line (Current_Out, Spacing); 1130 end New_Line; 1131 1132 -------------- 1133 -- New_Page -- 1134 -------------- 1135 1136 procedure New_Page (File : File_Type) is 1137 begin 1138 FIO.Check_Write_Status (AP (File)); 1139 1140 if File.Col /= 1 or else File.Line = 1 then 1141 Putc (LM, File); 1142 end if; 1143 1144 Putc (PM, File); 1145 File.Page := File.Page + 1; 1146 File.Line := 1; 1147 File.Col := 1; 1148 end New_Page; 1149 1150 procedure New_Page is 1151 begin 1152 New_Page (Current_Out); 1153 end New_Page; 1154 1155 ----------- 1156 -- Nextc -- 1157 ----------- 1158 1159 function Nextc (File : File_Type) return int is 1160 ch : int; 1161 1162 begin 1163 ch := fgetc (File.Stream); 1164 1165 if ch = EOF then 1166 if ferror (File.Stream) /= 0 then 1167 raise Device_Error; 1168 end if; 1169 1170 else 1171 if ungetc (ch, File.Stream) = EOF then 1172 raise Device_Error; 1173 end if; 1174 end if; 1175 1176 return ch; 1177 end Nextc; 1178 1179 ---------- 1180 -- Open -- 1181 ---------- 1182 1183 procedure Open 1184 (File : in out File_Type; 1185 Mode : File_Mode; 1186 Name : String; 1187 Form : String := "") 1188 is 1189 Dummy_File_Control_Block : Text_AFCB; 1190 pragma Warnings (Off, Dummy_File_Control_Block); 1191 -- Yes, we know this is never assigned a value, only the tag 1192 -- is used for dispatching purposes, so that's expected. 1193 1194 begin 1195 FIO.Open (File_Ptr => AP (File), 1196 Dummy_FCB => Dummy_File_Control_Block, 1197 Mode => To_FCB (Mode), 1198 Name => Name, 1199 Form => Form, 1200 Amethod => 'T', 1201 Creat => False, 1202 Text => True); 1203 1204 File.Self := File; 1205 Set_WCEM (File); 1206 end Open; 1207 1208 ---------- 1209 -- Page -- 1210 ---------- 1211 1212 -- Note: we assume that it is impossible in practice for the page 1213 -- to exceed the value of Count'Last, i.e. no check is required for 1214 -- overflow raising layout error. 1215 1216 function Page (File : File_Type) return Positive_Count is 1217 begin 1218 FIO.Check_File_Open (AP (File)); 1219 return File.Page; 1220 end Page; 1221 1222 function Page return Positive_Count is 1223 begin 1224 return Page (Current_Out); 1225 end Page; 1226 1227 ----------------- 1228 -- Page_Length -- 1229 ----------------- 1230 1231 function Page_Length (File : File_Type) return Count is 1232 begin 1233 FIO.Check_Write_Status (AP (File)); 1234 return File.Page_Length; 1235 end Page_Length; 1236 1237 function Page_Length return Count is 1238 begin 1239 return Page_Length (Current_Out); 1240 end Page_Length; 1241 1242 --------- 1243 -- Put -- 1244 --------- 1245 1246 procedure Put 1247 (File : File_Type; 1248 Item : Character) 1249 is 1250 begin 1251 FIO.Check_Write_Status (AP (File)); 1252 1253 if File.Line_Length /= 0 and then File.Col > File.Line_Length then 1254 New_Line (File); 1255 end if; 1256 1257 -- If lower half character, or brackets encoding, output directly 1258 1259 if Character'Pos (Item) < 16#80# 1260 or else File.WC_Method = WCEM_Brackets 1261 then 1262 if fputc (Character'Pos (Item), File.Stream) = EOF then 1263 raise Device_Error; 1264 end if; 1265 1266 -- Case of upper half character with non-brackets encoding 1267 1268 else 1269 Put_Encoded (File, Item); 1270 end if; 1271 1272 File.Col := File.Col + 1; 1273 end Put; 1274 1275 procedure Put (Item : Character) is 1276 begin 1277 Put (Current_Out, Item); 1278 end Put; 1279 1280 --------- 1281 -- Put -- 1282 --------- 1283 1284 procedure Put 1285 (File : File_Type; 1286 Item : String) 1287 is 1288 begin 1289 FIO.Check_Write_Status (AP (File)); 1290 1291 -- Only have something to do if string is non-null 1292 1293 if Item'Length > 0 then 1294 1295 -- If we have bounded lines, or if the file encoding is other than 1296 -- Brackets and the string has at least one upper half character, 1297 -- then output the string character by character. 1298 1299 if File.Line_Length /= 0 1300 or else (File.WC_Method /= WCEM_Brackets 1301 and then Has_Upper_Half_Character (Item)) 1302 then 1303 for J in Item'Range loop 1304 Put (File, Item (J)); 1305 end loop; 1306 1307 -- Otherwise we can output the entire string at once. Note that if 1308 -- there are LF or FF characters in the string, we do not bother to 1309 -- count them as line or page terminators. 1310 1311 else 1312 FIO.Write_Buf (AP (File), Item'Address, Item'Length); 1313 File.Col := File.Col + Item'Length; 1314 end if; 1315 end if; 1316 end Put; 1317 1318 procedure Put (Item : String) is 1319 begin 1320 Put (Current_Out, Item); 1321 end Put; 1322 1323 ----------------- 1324 -- Put_Encoded -- 1325 ----------------- 1326 1327 procedure Put_Encoded (File : File_Type; Char : Character) is 1328 procedure Out_Char (C : Character); 1329 -- Procedure to output one character of an upper half encoded sequence 1330 1331 procedure WC_Out is new Wide_Char_To_Char_Sequence (Out_Char); 1332 1333 -------------- 1334 -- Out_Char -- 1335 -------------- 1336 1337 procedure Out_Char (C : Character) is 1338 begin 1339 Putc (Character'Pos (C), File); 1340 end Out_Char; 1341 1342 -- Start of processing for Put_Encoded 1343 1344 begin 1345 WC_Out (Wide_Character'Val (Character'Pos (Char)), File.WC_Method); 1346 end Put_Encoded; 1347 1348 -------------- 1349 -- Put_Line -- 1350 -------------- 1351 1352 procedure Put_Line 1353 (File : File_Type; 1354 Item : String) 1355 is 1356 Ilen : Natural := Item'Length; 1357 Istart : Natural := Item'First; 1358 1359 begin 1360 FIO.Check_Write_Status (AP (File)); 1361 1362 -- If we have bounded lines, or if the file encoding is other than 1363 -- Brackets and the string has at least one upper half character, then 1364 -- output the string character by character. 1365 1366 if File.Line_Length /= 0 1367 or else (File.WC_Method /= WCEM_Brackets 1368 and then Has_Upper_Half_Character (Item)) 1369 then 1370 for J in Item'Range loop 1371 Put (File, Item (J)); 1372 end loop; 1373 1374 New_Line (File); 1375 return; 1376 end if; 1377 1378 -- Normal case where we do not need to output character by character 1379 1380 -- We setup a single string that has the necessary terminators and 1381 -- then write it with a single call. The reason for doing this is 1382 -- that it gives better behavior for the use of Put_Line in multi- 1383 -- tasking programs, since often the OS will treat the entire put 1384 -- operation as an atomic operation. 1385 1386 -- We only do this if the message is 512 characters or less in length, 1387 -- since otherwise Put_Line would use an unbounded amount of stack 1388 -- space and could cause undetected stack overflow. If we have a 1389 -- longer string, then output the first part separately to avoid this. 1390 1391 if Ilen > 512 then 1392 FIO.Write_Buf (AP (File), Item'Address, size_t (Ilen - 512)); 1393 Istart := Istart + Ilen - 512; 1394 Ilen := 512; 1395 end if; 1396 1397 -- Now prepare the string with its terminator 1398 1399 declare 1400 Buffer : String (1 .. Ilen + 2); 1401 Plen : size_t; 1402 1403 begin 1404 Buffer (1 .. Ilen) := Item (Istart .. Item'Last); 1405 Buffer (Ilen + 1) := Character'Val (LM); 1406 1407 if File.Page_Length /= 0 1408 and then File.Line > File.Page_Length 1409 then 1410 Buffer (Ilen + 2) := Character'Val (PM); 1411 Plen := size_t (Ilen) + 2; 1412 File.Line := 1; 1413 File.Page := File.Page + 1; 1414 1415 else 1416 Plen := size_t (Ilen) + 1; 1417 File.Line := File.Line + 1; 1418 end if; 1419 1420 FIO.Write_Buf (AP (File), Buffer'Address, Plen); 1421 1422 File.Col := 1; 1423 end; 1424 end Put_Line; 1425 1426 procedure Put_Line (Item : String) is 1427 begin 1428 Put_Line (Current_Out, Item); 1429 end Put_Line; 1430 1431 ---------- 1432 -- Putc -- 1433 ---------- 1434 1435 procedure Putc (ch : int; File : File_Type) is 1436 begin 1437 if fputc (ch, File.Stream) = EOF then 1438 raise Device_Error; 1439 end if; 1440 end Putc; 1441 1442 ---------- 1443 -- Read -- 1444 ---------- 1445 1446 -- This is the primitive Stream Read routine, used when a Text_IO file 1447 -- is treated directly as a stream using Text_IO.Streams.Stream. 1448 1449 procedure Read 1450 (File : in out Text_AFCB; 1451 Item : out Stream_Element_Array; 1452 Last : out Stream_Element_Offset) 1453 is 1454 Discard_ch : int; 1455 pragma Warnings (Off, Discard_ch); 1456 1457 begin 1458 -- Need to deal with Before_Upper_Half_Character ??? 1459 1460 if File.Mode /= FCB.In_File then 1461 raise Mode_Error; 1462 end if; 1463 1464 -- Deal with case where our logical and physical position do not match 1465 -- because of being after an LM or LM-PM sequence when in fact we are 1466 -- logically positioned before it. 1467 1468 if File.Before_LM then 1469 1470 -- If we are before a PM, then it is possible for a stream read 1471 -- to leave us after the LM and before the PM, which is a bit 1472 -- odd. The easiest way to deal with this is to unget the PM, 1473 -- so we are indeed positioned between the characters. This way 1474 -- further stream read operations will work correctly, and the 1475 -- effect on text processing is a little weird, but what can 1476 -- be expected if stream and text input are mixed this way? 1477 1478 if File.Before_LM_PM then 1479 Discard_ch := ungetc (PM, File.Stream); 1480 File.Before_LM_PM := False; 1481 end if; 1482 1483 File.Before_LM := False; 1484 1485 Item (Item'First) := Stream_Element (Character'Pos (ASCII.LF)); 1486 1487 if Item'Length = 1 then 1488 Last := Item'Last; 1489 1490 else 1491 Last := 1492 Item'First + 1493 Stream_Element_Offset 1494 (fread (buffer => Item'Address, 1495 index => size_t (Item'First + 1), 1496 size => 1, 1497 count => Item'Length - 1, 1498 stream => File.Stream)); 1499 end if; 1500 1501 return; 1502 end if; 1503 1504 -- Now we do the read. Since this is a text file, it is normally in 1505 -- text mode, but stream data must be read in binary mode, so we 1506 -- temporarily set binary mode for the read, resetting it after. 1507 -- These calls have no effect in a system (like Unix) where there is 1508 -- no distinction between text and binary files. 1509 1510 set_binary_mode (fileno (File.Stream)); 1511 1512 Last := 1513 Item'First + 1514 Stream_Element_Offset 1515 (fread (Item'Address, 1, Item'Length, File.Stream)) - 1; 1516 1517 if Last < Item'Last then 1518 if ferror (File.Stream) /= 0 then 1519 raise Device_Error; 1520 end if; 1521 end if; 1522 1523 set_text_mode (fileno (File.Stream)); 1524 end Read; 1525 1526 ----------- 1527 -- Reset -- 1528 ----------- 1529 1530 procedure Reset 1531 (File : in out File_Type; 1532 Mode : File_Mode) 1533 is 1534 begin 1535 -- Don't allow change of mode for current file (RM A.10.2(5)) 1536 1537 if (File = Current_In or else 1538 File = Current_Out or else 1539 File = Current_Error) 1540 and then To_FCB (Mode) /= File.Mode 1541 then 1542 raise Mode_Error; 1543 end if; 1544 1545 Terminate_Line (File); 1546 FIO.Reset (AP (File)'Unrestricted_Access, To_FCB (Mode)); 1547 File.Page := 1; 1548 File.Line := 1; 1549 File.Col := 1; 1550 File.Line_Length := 0; 1551 File.Page_Length := 0; 1552 File.Before_LM := False; 1553 File.Before_LM_PM := False; 1554 end Reset; 1555 1556 procedure Reset (File : in out File_Type) is 1557 begin 1558 Terminate_Line (File); 1559 FIO.Reset (AP (File)'Unrestricted_Access); 1560 File.Page := 1; 1561 File.Line := 1; 1562 File.Col := 1; 1563 File.Line_Length := 0; 1564 File.Page_Length := 0; 1565 File.Before_LM := False; 1566 File.Before_LM_PM := False; 1567 end Reset; 1568 1569 ------------- 1570 -- Set_Col -- 1571 ------------- 1572 1573 procedure Set_Col 1574 (File : File_Type; 1575 To : Positive_Count) 1576 is 1577 ch : int; 1578 1579 begin 1580 -- Raise Constraint_Error if out of range value. The reason for this 1581 -- explicit test is that we don't want junk values around, even if 1582 -- checks are off in the caller. 1583 1584 if not To'Valid then 1585 raise Constraint_Error; 1586 end if; 1587 1588 FIO.Check_File_Open (AP (File)); 1589 1590 -- Output case 1591 1592 if Mode (File) >= Out_File then 1593 1594 -- Error if we attempt to set Col to a value greater than the 1595 -- maximum permissible line length. 1596 1597 if File.Line_Length /= 0 and then To > File.Line_Length then 1598 raise Layout_Error; 1599 end if; 1600 1601 -- If we are behind current position, then go to start of new line 1602 1603 if To < File.Col then 1604 New_Line (File); 1605 end if; 1606 1607 -- Loop to output blanks till we are at the required column 1608 1609 while File.Col < To loop 1610 Put (File, ' '); 1611 end loop; 1612 1613 -- Input case 1614 1615 else 1616 -- If we are logically before a LM, but physically after it, the 1617 -- file position still reflects the position before the LM, so eat 1618 -- it now and adjust the file position appropriately. 1619 1620 if File.Before_LM then 1621 File.Before_LM := False; 1622 File.Before_LM_PM := False; 1623 File.Line := File.Line + 1; 1624 File.Col := 1; 1625 end if; 1626 1627 -- Loop reading characters till we get one at the required Col value 1628 1629 loop 1630 -- Read next character. The reason we have to read ahead is to 1631 -- skip formatting characters, the effect of Set_Col is to set 1632 -- us to a real character with the right Col value, and format 1633 -- characters don't count. 1634 1635 ch := Getc (File); 1636 1637 -- Error if we hit an end of file 1638 1639 if ch = EOF then 1640 raise End_Error; 1641 1642 -- If line mark, eat it and adjust file position 1643 1644 elsif ch = LM then 1645 File.Line := File.Line + 1; 1646 File.Col := 1; 1647 1648 -- If recognized page mark, eat it, and adjust file position 1649 1650 elsif ch = PM and then File.Is_Regular_File then 1651 File.Page := File.Page + 1; 1652 File.Line := 1; 1653 File.Col := 1; 1654 1655 -- Otherwise this is the character we are looking for, so put it 1656 -- back in the input stream (we have not adjusted the file 1657 -- position yet, so everything is set right after this ungetc). 1658 1659 elsif To = File.Col then 1660 Ungetc (ch, File); 1661 return; 1662 1663 -- Keep skipping characters if we are not there yet, updating the 1664 -- file position past the skipped character. 1665 1666 else 1667 File.Col := File.Col + 1; 1668 end if; 1669 end loop; 1670 end if; 1671 end Set_Col; 1672 1673 procedure Set_Col (To : Positive_Count) is 1674 begin 1675 Set_Col (Current_Out, To); 1676 end Set_Col; 1677 1678 --------------- 1679 -- Set_Error -- 1680 --------------- 1681 1682 procedure Set_Error (File : File_Type) is 1683 begin 1684 FIO.Check_Write_Status (AP (File)); 1685 Current_Err := File; 1686 end Set_Error; 1687 1688 --------------- 1689 -- Set_Input -- 1690 --------------- 1691 1692 procedure Set_Input (File : File_Type) is 1693 begin 1694 FIO.Check_Read_Status (AP (File)); 1695 Current_In := File; 1696 end Set_Input; 1697 1698 -------------- 1699 -- Set_Line -- 1700 -------------- 1701 1702 procedure Set_Line 1703 (File : File_Type; 1704 To : Positive_Count) 1705 is 1706 begin 1707 -- Raise Constraint_Error if out of range value. The reason for this 1708 -- explicit test is that we don't want junk values around, even if 1709 -- checks are off in the caller. 1710 1711 if not To'Valid then 1712 raise Constraint_Error; 1713 end if; 1714 1715 FIO.Check_File_Open (AP (File)); 1716 1717 if To = File.Line then 1718 return; 1719 end if; 1720 1721 if Mode (File) >= Out_File then 1722 if File.Page_Length /= 0 and then To > File.Page_Length then 1723 raise Layout_Error; 1724 end if; 1725 1726 if To < File.Line then 1727 New_Page (File); 1728 end if; 1729 1730 while File.Line < To loop 1731 New_Line (File); 1732 end loop; 1733 1734 else 1735 while To /= File.Line loop 1736 Skip_Line (File); 1737 end loop; 1738 end if; 1739 end Set_Line; 1740 1741 procedure Set_Line (To : Positive_Count) is 1742 begin 1743 Set_Line (Current_Out, To); 1744 end Set_Line; 1745 1746 --------------------- 1747 -- Set_Line_Length -- 1748 --------------------- 1749 1750 procedure Set_Line_Length (File : File_Type; To : Count) is 1751 begin 1752 -- Raise Constraint_Error if out of range value. The reason for this 1753 -- explicit test is that we don't want junk values around, even if 1754 -- checks are off in the caller. 1755 1756 if not To'Valid then 1757 raise Constraint_Error; 1758 end if; 1759 1760 FIO.Check_Write_Status (AP (File)); 1761 File.Line_Length := To; 1762 end Set_Line_Length; 1763 1764 procedure Set_Line_Length (To : Count) is 1765 begin 1766 Set_Line_Length (Current_Out, To); 1767 end Set_Line_Length; 1768 1769 ---------------- 1770 -- Set_Output -- 1771 ---------------- 1772 1773 procedure Set_Output (File : File_Type) is 1774 begin 1775 FIO.Check_Write_Status (AP (File)); 1776 Current_Out := File; 1777 end Set_Output; 1778 1779 --------------------- 1780 -- Set_Page_Length -- 1781 --------------------- 1782 1783 procedure Set_Page_Length (File : File_Type; To : Count) is 1784 begin 1785 -- Raise Constraint_Error if out of range value. The reason for this 1786 -- explicit test is that we don't want junk values around, even if 1787 -- checks are off in the caller. 1788 1789 if not To'Valid then 1790 raise Constraint_Error; 1791 end if; 1792 1793 FIO.Check_Write_Status (AP (File)); 1794 File.Page_Length := To; 1795 end Set_Page_Length; 1796 1797 procedure Set_Page_Length (To : Count) is 1798 begin 1799 Set_Page_Length (Current_Out, To); 1800 end Set_Page_Length; 1801 1802 -------------- 1803 -- Set_WCEM -- 1804 -------------- 1805 1806 procedure Set_WCEM (File : in out File_Type) is 1807 Start : Natural; 1808 Stop : Natural; 1809 1810 begin 1811 File.WC_Method := WCEM_Brackets; 1812 FIO.Form_Parameter (File.Form.all, "wcem", Start, Stop); 1813 1814 if Start = 0 then 1815 File.WC_Method := WCEM_Brackets; 1816 1817 else 1818 if Stop = Start then 1819 for J in WC_Encoding_Letters'Range loop 1820 if File.Form (Start) = WC_Encoding_Letters (J) then 1821 File.WC_Method := J; 1822 return; 1823 end if; 1824 end loop; 1825 end if; 1826 1827 Close (File); 1828 raise Use_Error with "invalid WCEM form parameter"; 1829 end if; 1830 end Set_WCEM; 1831 1832 --------------- 1833 -- Skip_Line -- 1834 --------------- 1835 1836 procedure Skip_Line 1837 (File : File_Type; 1838 Spacing : Positive_Count := 1) 1839 is 1840 ch : int; 1841 1842 begin 1843 -- Raise Constraint_Error if out of range value. The reason for this 1844 -- explicit test is that we don't want junk values around, even if 1845 -- checks are off in the caller. 1846 1847 if not Spacing'Valid then 1848 raise Constraint_Error; 1849 end if; 1850 1851 FIO.Check_Read_Status (AP (File)); 1852 1853 for L in 1 .. Spacing loop 1854 if File.Before_LM then 1855 File.Before_LM := False; 1856 1857 -- Note that if File.Before_LM_PM is currently set, we also have 1858 -- to reset it (because it makes sense for Before_LM_PM to be set 1859 -- only when Before_LM is also set). This is done later on in this 1860 -- subprogram, as soon as Before_LM_PM has been taken into account 1861 -- for the purpose of page and line counts. 1862 1863 else 1864 ch := Getc (File); 1865 1866 -- If at end of file now, then immediately raise End_Error. Note 1867 -- that we can never be positioned between a line mark and a page 1868 -- mark, so if we are at the end of file, we cannot logically be 1869 -- before the implicit page mark that is at the end of the file. 1870 1871 -- For the same reason, we do not need an explicit check for a 1872 -- page mark. If there is a FF in the middle of a line, the file 1873 -- is not in canonical format and we do not care about the page 1874 -- numbers for files other than ones in canonical format. 1875 1876 if ch = EOF then 1877 raise End_Error; 1878 end if; 1879 1880 -- If not at end of file, then loop till we get to an LM or EOF. 1881 -- The latter case happens only in non-canonical files where the 1882 -- last line is not terminated by LM, but we don't want to blow 1883 -- up for such files, so we assume an implicit LM in this case. 1884 1885 loop 1886 exit when ch = LM or else ch = EOF; 1887 ch := Getc (File); 1888 end loop; 1889 end if; 1890 1891 -- We have got past a line mark, now, for a regular file only, 1892 -- see if a page mark immediately follows this line mark and 1893 -- if so, skip past the page mark as well. We do not do this 1894 -- for non-regular files, since it would cause an undesirable 1895 -- wait for an additional character. 1896 1897 File.Col := 1; 1898 File.Line := File.Line + 1; 1899 1900 if File.Before_LM_PM then 1901 File.Page := File.Page + 1; 1902 File.Line := 1; 1903 File.Before_LM_PM := False; 1904 1905 elsif File.Is_Regular_File then 1906 ch := Getc (File); 1907 1908 -- Page mark can be explicit, or implied at the end of the file 1909 1910 if (ch = PM or else ch = EOF) 1911 and then File.Is_Regular_File 1912 then 1913 File.Page := File.Page + 1; 1914 File.Line := 1; 1915 else 1916 Ungetc (ch, File); 1917 end if; 1918 end if; 1919 end loop; 1920 1921 File.Before_Upper_Half_Character := False; 1922 end Skip_Line; 1923 1924 procedure Skip_Line (Spacing : Positive_Count := 1) is 1925 begin 1926 Skip_Line (Current_In, Spacing); 1927 end Skip_Line; 1928 1929 --------------- 1930 -- Skip_Page -- 1931 --------------- 1932 1933 procedure Skip_Page (File : File_Type) is 1934 ch : int; 1935 1936 begin 1937 FIO.Check_Read_Status (AP (File)); 1938 1939 -- If at page mark already, just skip it 1940 1941 if File.Before_LM_PM then 1942 File.Before_LM := False; 1943 File.Before_LM_PM := False; 1944 File.Page := File.Page + 1; 1945 File.Line := 1; 1946 File.Col := 1; 1947 return; 1948 end if; 1949 1950 -- This is a bit tricky, if we are logically before an LM then 1951 -- it is not an error if we are at an end of file now, since we 1952 -- are not really at it. 1953 1954 if File.Before_LM then 1955 File.Before_LM := False; 1956 File.Before_LM_PM := False; 1957 ch := Getc (File); 1958 1959 -- Otherwise we do raise End_Error if we are at the end of file now 1960 1961 else 1962 ch := Getc (File); 1963 1964 if ch = EOF then 1965 raise End_Error; 1966 end if; 1967 end if; 1968 1969 -- Now we can just rumble along to the next page mark, or to the 1970 -- end of file, if that comes first. The latter case happens when 1971 -- the page mark is implied at the end of file. 1972 1973 loop 1974 exit when ch = EOF 1975 or else (ch = PM and then File.Is_Regular_File); 1976 ch := Getc (File); 1977 end loop; 1978 1979 File.Page := File.Page + 1; 1980 File.Line := 1; 1981 File.Col := 1; 1982 File.Before_Upper_Half_Character := False; 1983 end Skip_Page; 1984 1985 procedure Skip_Page is 1986 begin 1987 Skip_Page (Current_In); 1988 end Skip_Page; 1989 1990 -------------------- 1991 -- Standard_Error -- 1992 -------------------- 1993 1994 function Standard_Error return File_Type is 1995 begin 1996 return Standard_Err; 1997 end Standard_Error; 1998 1999 function Standard_Error return File_Access is 2000 begin 2001 return Standard_Err'Access; 2002 end Standard_Error; 2003 2004 -------------------- 2005 -- Standard_Input -- 2006 -------------------- 2007 2008 function Standard_Input return File_Type is 2009 begin 2010 return Standard_In; 2011 end Standard_Input; 2012 2013 function Standard_Input return File_Access is 2014 begin 2015 return Standard_In'Access; 2016 end Standard_Input; 2017 2018 --------------------- 2019 -- Standard_Output -- 2020 --------------------- 2021 2022 function Standard_Output return File_Type is 2023 begin 2024 return Standard_Out; 2025 end Standard_Output; 2026 2027 function Standard_Output return File_Access is 2028 begin 2029 return Standard_Out'Access; 2030 end Standard_Output; 2031 2032 -------------------- 2033 -- Terminate_Line -- 2034 -------------------- 2035 2036 procedure Terminate_Line (File : File_Type) is 2037 begin 2038 FIO.Check_File_Open (AP (File)); 2039 2040 -- For file other than In_File, test for needing to terminate last line 2041 2042 if Mode (File) /= In_File then 2043 2044 -- If not at start of line definition need new line 2045 2046 if File.Col /= 1 then 2047 New_Line (File); 2048 2049 -- For files other than standard error and standard output, we 2050 -- make sure that an empty file has a single line feed, so that 2051 -- it is properly formatted. We avoid this for the standard files 2052 -- because it is too much of a nuisance to have these odd line 2053 -- feeds when nothing has been written to the file. 2054 2055 -- We also avoid this for files opened in append mode, in 2056 -- accordance with (RM A.8.2(10)) 2057 2058 elsif (File /= Standard_Err and then File /= Standard_Out) 2059 and then (File.Line = 1 and then File.Page = 1) 2060 and then Mode (File) = Out_File 2061 then 2062 New_Line (File); 2063 end if; 2064 end if; 2065 end Terminate_Line; 2066 2067 ------------ 2068 -- Ungetc -- 2069 ------------ 2070 2071 procedure Ungetc (ch : int; File : File_Type) is 2072 begin 2073 if ch /= EOF then 2074 if ungetc (ch, File.Stream) = EOF then 2075 raise Device_Error; 2076 end if; 2077 end if; 2078 end Ungetc; 2079 2080 ----------- 2081 -- Write -- 2082 ----------- 2083 2084 -- This is the primitive Stream Write routine, used when a Text_IO file 2085 -- is treated directly as a stream using Text_IO.Streams.Stream. 2086 2087 procedure Write 2088 (File : in out Text_AFCB; 2089 Item : Stream_Element_Array) 2090 is 2091 pragma Warnings (Off, File); 2092 -- Because in this implementation we don't need IN OUT, we only read 2093 2094 function Has_Translated_Characters return Boolean; 2095 -- return True if Item array contains a character which will be 2096 -- translated under the text file mode. There is only one such 2097 -- character under DOS based systems which is character 10. 2098 2099 text_translation_required : Boolean; 2100 for text_translation_required'Size use Character'Size; 2101 pragma Import (C, text_translation_required, 2102 "__gnat_text_translation_required"); 2103 2104 Siz : constant size_t := Item'Length; 2105 2106 ------------------------------- 2107 -- Has_Translated_Characters -- 2108 ------------------------------- 2109 2110 function Has_Translated_Characters return Boolean is 2111 begin 2112 for K in Item'Range loop 2113 if Item (K) = 10 then 2114 return True; 2115 end if; 2116 end loop; 2117 return False; 2118 end Has_Translated_Characters; 2119 2120 Needs_Binary_Write : constant Boolean := 2121 text_translation_required and then Has_Translated_Characters; 2122 2123 -- Start of processing for Write 2124 2125 begin 2126 if File.Mode = FCB.In_File then 2127 raise Mode_Error; 2128 end if; 2129 2130 -- Now we do the write. Since this is a text file, it is normally in 2131 -- text mode, but stream data must be written in binary mode, so we 2132 -- temporarily set binary mode for the write, resetting it after. This 2133 -- is done only if needed (i.e. there is some characters in Item which 2134 -- needs to be written using the binary mode). 2135 -- These calls have no effect in a system (like Unix) where there is 2136 -- no distinction between text and binary files. 2137 2138 -- Since the character translation is done at the time the buffer is 2139 -- written (this is true under Windows) we first flush current buffer 2140 -- with text mode if needed. 2141 2142 if Needs_Binary_Write then 2143 if fflush (File.Stream) = -1 then 2144 raise Device_Error; 2145 end if; 2146 2147 set_binary_mode (fileno (File.Stream)); 2148 end if; 2149 2150 if fwrite (Item'Address, 1, Siz, File.Stream) /= Siz then 2151 raise Device_Error; 2152 end if; 2153 2154 -- At this point we need to flush the buffer using the binary mode then 2155 -- we reset to text mode. 2156 2157 if Needs_Binary_Write then 2158 if fflush (File.Stream) = -1 then 2159 raise Device_Error; 2160 end if; 2161 2162 set_text_mode (fileno (File.Stream)); 2163 end if; 2164 end Write; 2165 2166begin 2167 -- Initialize Standard Files 2168 2169 for J in WC_Encoding_Method loop 2170 if WC_Encoding = WC_Encoding_Letters (J) then 2171 Default_WCEM := J; 2172 end if; 2173 end loop; 2174 2175 Initialize_Standard_Files; 2176 2177 FIO.Chain_File (AP (Standard_In)); 2178 FIO.Chain_File (AP (Standard_Out)); 2179 FIO.Chain_File (AP (Standard_Err)); 2180 2181end Ada.Text_IO; 2182