1 ------------------------------------------------------------------------------
3 -- GNAT RUN-TIME COMPONENTS --
5 -- A D A . W I D E _ T E X T _ I O --
9 -- Copyright (C) 1992-2008, Free Software Foundation, Inc. --
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 2, 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. See the GNU General Public License --
17 -- for more details. You should have received a copy of the GNU General --
18 -- Public License distributed with GNAT; see file COPYING. If not, write --
19 -- to the Free Software Foundation, 51 Franklin Street, Fifth Floor, --
20 -- Boston, MA 02110-1301, USA. --
22 -- As a special exception, if other files instantiate generics from this --
23 -- unit, or you link this unit with other files to produce an executable, --
24 -- this unit does not by itself cause the resulting executable to be --
25 -- covered by the GNU General Public License. This exception does not --
26 -- however invalidate any other reasons why the executable file might be --
27 -- covered by the GNU Public License. --
29 -- GNAT was originally developed by the GNAT team at New York University. --
30 -- Extensive contributions were provided by Ada Core Technologies Inc. --
32 ------------------------------------------------------------------------------
34 with Ada.Streams; use Ada.Streams;
35 with Interfaces.C_Streams; use Interfaces.C_Streams;
39 with System.WCh_Cnv; use System.WCh_Cnv;
40 with System.WCh_Con; use System.WCh_Con;
42 with Ada.Unchecked_Conversion;
43 with Ada.Unchecked_Deallocation;
45 pragma Elaborate_All (System.File_IO);
46 -- Needed because of calls to Chain_File in package body elaboration
48 package body Ada.Wide_Text_IO is
50 package FIO renames System.File_IO;
52 subtype AP is FCB.AFCB_Ptr;
54 function To_FCB is new Ada.Unchecked_Conversion (File_Mode, FCB.File_Mode);
55 function To_TIO is new Ada.Unchecked_Conversion (FCB.File_Mode, File_Mode);
56 use type FCB.File_Mode;
58 use type System.CRTL.size_t;
60 WC_Encoding : Character;
61 pragma Import (C, WC_Encoding, "__gl_wc_encoding");
63 -----------------------
64 -- Local Subprograms --
65 -----------------------
67 function Getc_Immed (File : File_Type) return int;
68 -- This routine is identical to Getc, except that the read is done in
69 -- Get_Immediate mode (i.e. without waiting for a line return).
71 function Get_Wide_Char_Immed
73 File : File_Type) return Wide_Character;
74 -- This routine is identical to Get_Wide_Char, except that the reads are
75 -- done in Get_Immediate mode (i.e. without waiting for a line return).
77 procedure Set_WCEM (File : in out File_Type);
78 -- Called by Open and Create to set the wide character encoding method for
79 -- the file, processing a WCEM form parameter if one is present. File is
80 -- IN OUT because it may be closed in case of an error.
86 function AFCB_Allocate
87 (Control_Block : Wide_Text_AFCB) return FCB.AFCB_Ptr
89 pragma Unreferenced (Control_Block);
91 return new Wide_Text_AFCB;
98 procedure AFCB_Close (File : not null access Wide_Text_AFCB) is
100 -- If the file being closed is one of the current files, then close
101 -- the corresponding current file. It is not clear that this action
102 -- is required (RM A.10.3(23)) but it seems reasonable, and besides
103 -- ACVC test CE3208A expects this behavior.
105 if File_Type (File) = Current_In then
107 elsif File_Type (File) = Current_Out then
109 elsif File_Type (File) = Current_Err then
113 Terminate_Line (File_Type (File));
120 procedure AFCB_Free (File : not null access Wide_Text_AFCB) is
121 type FCB_Ptr is access all Wide_Text_AFCB;
122 FT : FCB_Ptr := FCB_Ptr (File);
125 new Ada.Unchecked_Deallocation (Wide_Text_AFCB, FCB_Ptr);
135 procedure Close (File : in out File_Type) is
137 FIO.Close (AP (File)'Unrestricted_Access);
144 -- Note: we assume that it is impossible in practice for the column
145 -- to exceed the value of Count'Last, i.e. no check is required for
146 -- overflow raising layout error.
148 function Col (File : File_Type) return Positive_Count is
150 FIO.Check_File_Open (AP (File));
154 function Col return Positive_Count is
156 return Col (Current_Out);
164 (File : in out File_Type;
165 Mode : File_Mode := Out_File;
169 Dummy_File_Control_Block : Wide_Text_AFCB;
170 pragma Warnings (Off, Dummy_File_Control_Block);
171 -- Yes, we know this is never assigned a value, only the tag
172 -- is used for dispatching purposes, so that's expected.
175 FIO.Open (File_Ptr => AP (File),
176 Dummy_FCB => Dummy_File_Control_Block,
177 Mode => To_FCB (Mode),
192 function Current_Error return File_Type is
197 function Current_Error return File_Access is
199 return Current_Err.Self'Access;
206 function Current_Input return File_Type is
211 function Current_Input return File_Access is
213 return Current_In.Self'Access;
220 function Current_Output return File_Type is
225 function Current_Output return File_Access is
227 return Current_Out.Self'Access;
234 procedure Delete (File : in out File_Type) is
236 FIO.Delete (AP (File)'Unrestricted_Access);
243 function End_Of_File (File : File_Type) return Boolean is
247 FIO.Check_Read_Status (AP (File));
249 if File.Before_Wide_Character then
252 elsif File.Before_LM then
253 if File.Before_LM_PM then
254 return Nextc (File) = EOF;
268 File.Before_LM := True;
272 -- Here we are just past the line mark with Before_LM set so that we
273 -- do not have to try to back up past the LM, thus avoiding the need
274 -- to back up more than one character.
281 elsif ch = PM and then File.Is_Regular_File then
282 File.Before_LM_PM := True;
283 return Nextc (File) = EOF;
285 -- Here if neither EOF nor PM followed end of line
294 function End_Of_File return Boolean is
296 return End_Of_File (Current_In);
303 function End_Of_Line (File : File_Type) return Boolean is
307 FIO.Check_Read_Status (AP (File));
309 if File.Before_Wide_Character then
312 elsif File.Before_LM then
328 function End_Of_Line return Boolean is
330 return End_Of_Line (Current_In);
337 function End_Of_Page (File : File_Type) return Boolean is
341 FIO.Check_Read_Status (AP (File));
343 if not File.Is_Regular_File then
346 elsif File.Before_Wide_Character then
349 elsif File.Before_LM then
350 if File.Before_LM_PM then
365 File.Before_LM := True;
369 -- Here we are just past the line mark with Before_LM set so that we
370 -- do not have to try to back up past the LM, thus avoiding the need
371 -- to back up more than one character.
375 return ch = PM or else ch = EOF;
378 function End_Of_Page return Boolean is
380 return End_Of_Page (Current_In);
387 procedure Flush (File : File_Type) is
389 FIO.Flush (AP (File));
401 function Form (File : File_Type) return String is
403 return FIO.Form (AP (File));
412 Item : out Wide_Character)
417 FIO.Check_Read_Status (AP (File));
419 if File.Before_Wide_Character then
420 File.Before_Wide_Character := False;
421 Item := File.Saved_Wide_Character;
423 -- Ada.Text_IO checks Before_LM_PM here, shouldn't we do the same???
426 Get_Character (File, C);
427 Item := Get_Wide_Char (C, File);
431 procedure Get (Item : out Wide_Character) is
433 Get (Current_In, Item);
438 Item : out Wide_String)
441 for J in Item'Range loop
442 Get (File, Item (J));
446 procedure Get (Item : out Wide_String) is
448 Get (Current_In, Item);
455 procedure Get_Character
457 Item : out Character)
462 if File.Before_LM then
463 File.Before_LM := False;
464 File.Before_LM_PM := False;
467 if File.Before_LM_PM then
469 File.Page := File.Page + 1;
470 File.Before_LM_PM := False;
473 File.Line := File.Line + 1;
484 File.Line := File.Line + 1;
487 elsif ch = PM and then File.Is_Regular_File then
488 File.Page := File.Page + 1;
492 Item := Character'Val (ch);
493 File.Col := File.Col + 1;
503 procedure Get_Immediate
505 Item : out Wide_Character)
510 FIO.Check_Read_Status (AP (File));
512 if File.Before_Wide_Character then
513 File.Before_Wide_Character := False;
514 Item := File.Saved_Wide_Character;
516 elsif File.Before_LM then
517 File.Before_LM := False;
518 File.Before_LM_PM := False;
519 Item := Wide_Character'Val (LM);
522 ch := Getc_Immed (File);
527 Item := Get_Wide_Char_Immed (Character'Val (ch), File);
532 procedure Get_Immediate
533 (Item : out Wide_Character)
536 Get_Immediate (Current_In, Item);
539 procedure Get_Immediate
541 Item : out Wide_Character;
542 Available : out Boolean)
547 FIO.Check_Read_Status (AP (File));
550 if File.Before_Wide_Character then
551 File.Before_Wide_Character := False;
552 Item := File.Saved_Wide_Character;
554 elsif File.Before_LM then
555 File.Before_LM := False;
556 File.Before_LM_PM := False;
557 Item := Wide_Character'Val (LM);
560 -- Shouldn't we use getc_immediate_nowait here, like Text_IO???
562 ch := Getc_Immed (File);
567 Item := Get_Wide_Char_Immed (Character'Val (ch), File);
572 procedure Get_Immediate
573 (Item : out Wide_Character;
574 Available : out Boolean)
577 Get_Immediate (Current_In, Item, Available);
586 Item : out Wide_String;
590 FIO.Check_Read_Status (AP (File));
591 Last := Item'First - 1;
593 -- Immediate exit for null string, this is a case in which we do not
594 -- need to test for end of file and we do not skip a line mark under
595 -- any circumstances.
597 if Last >= Item'Last then
601 -- Here we have at least one character, if we are immediately before
602 -- a line mark, then we will just skip past it storing no characters.
604 if File.Before_LM then
605 File.Before_LM := False;
606 File.Before_LM_PM := False;
608 -- Otherwise we need to read some characters
611 -- If we are at the end of file now, it means we are trying to
612 -- skip a file terminator and we raise End_Error (RM A.10.7(20))
614 if Nextc (File) = EOF then
618 -- Loop through characters in string
621 -- Exit the loop if read is terminated by encountering line mark
622 -- Note that the use of Skip_Line here ensures we properly deal
623 -- with setting the page and line numbers.
625 if End_Of_Line (File) then
630 -- Otherwise store the character, note that we know that ch is
631 -- something other than LM or EOF. It could possibly be a page
632 -- mark if there is a stray page mark in the middle of a line,
633 -- but this is not an official page mark in any case, since
634 -- official page marks can only follow a line mark. The whole
635 -- page business is pretty much nonsense anyway, so we do not
636 -- want to waste time trying to make sense out of non-standard
637 -- page marks in the file! This means that the behavior of
638 -- Get_Line is different from repeated Get of a character, but
639 -- that's too bad. We only promise that page numbers etc make
640 -- sense if the file is formatted in a standard manner.
642 -- Note: we do not adjust the column number because it is quicker
643 -- to adjust it once at the end of the operation than incrementing
644 -- it each time around the loop.
647 Get (File, Item (Last));
649 -- All done if the string is full, this is the case in which
650 -- we do not skip the following line mark. We need to adjust
651 -- the column number in this case.
653 if Last = Item'Last then
654 File.Col := File.Col + Count (Item'Length);
658 -- Exit from the loop if we are at the end of file. This happens
659 -- if we have a last line that is not terminated with a line mark.
660 -- In this case we consider that there is an implied line mark;
661 -- this is a non-standard file, but we will treat it nicely.
663 exit when Nextc (File) = EOF;
669 (Item : out Wide_String;
673 Get_Line (Current_In, Item, Last);
676 function Get_Line (File : File_Type) return Wide_String is
677 Buffer : Wide_String (1 .. 500);
680 function Get_Rest (S : Wide_String) return Wide_String;
681 -- This is a recursive function that reads the rest of the line and
682 -- returns it. S is the part read so far.
688 function Get_Rest (S : Wide_String) return Wide_String is
690 -- Each time we allocate a buffer the same size as what we have
691 -- read so far. This limits us to a logarithmic number of calls
692 -- to Get_Rest and also ensures only a linear use of stack space.
694 Buffer : Wide_String (1 .. S'Length);
698 Get_Line (File, Buffer, Last);
701 R : constant Wide_String := S & Buffer (1 .. Last);
703 if Last < Buffer'Last then
711 -- Start of processing for Get_Line
714 Get_Line (File, Buffer, Last);
716 if Last < Buffer'Last then
717 return Buffer (1 .. Last);
719 return Get_Rest (Buffer (1 .. Last));
723 function Get_Line return Wide_String is
725 return Get_Line (Current_In);
732 function Get_Wide_Char
734 File : File_Type) return Wide_Character
736 function In_Char return Character;
737 -- Function used to obtain additional characters it the wide character
738 -- sequence is more than one character long.
740 function WC_In is new Char_Sequence_To_Wide_Char (In_Char);
746 function In_Char return Character is
747 ch : constant Integer := Getc (File);
752 return Character'Val (ch);
756 -- Start of processing for Get_Wide_Char
759 FIO.Check_Read_Status (AP (File));
760 return WC_In (C, File.WC_Method);
763 -------------------------
764 -- Get_Wide_Char_Immed --
765 -------------------------
767 function Get_Wide_Char_Immed
769 File : File_Type) return Wide_Character
771 function In_Char return Character;
772 -- Function used to obtain additional characters it the wide character
773 -- sequence is more than one character long.
775 function WC_In is new Char_Sequence_To_Wide_Char (In_Char);
781 function In_Char return Character is
782 ch : constant Integer := Getc_Immed (File);
787 return Character'Val (ch);
791 -- Start of processing for Get_Wide_Char_Immed
794 FIO.Check_Read_Status (AP (File));
795 return WC_In (C, File.WC_Method);
796 end Get_Wide_Char_Immed;
802 function Getc (File : File_Type) return int is
806 ch := fgetc (File.Stream);
808 if ch = EOF and then ferror (File.Stream) /= 0 then
819 function Getc_Immed (File : File_Type) return int is
823 procedure getc_immediate
824 (stream : FILEs; ch : out int; end_of_file : out int);
825 pragma Import (C, getc_immediate, "getc_immediate");
828 FIO.Check_Read_Status (AP (File));
830 if File.Before_LM then
831 File.Before_LM := False;
832 File.Before_LM_PM := False;
836 getc_immediate (File.Stream, ch, end_of_file);
838 if ferror (File.Stream) /= 0 then
840 elsif end_of_file /= 0 then
852 function Is_Open (File : File_Type) return Boolean is
854 return FIO.Is_Open (AP (File));
861 -- Note: we assume that it is impossible in practice for the line
862 -- to exceed the value of Count'Last, i.e. no check is required for
863 -- overflow raising layout error.
865 function Line (File : File_Type) return Positive_Count is
867 FIO.Check_File_Open (AP (File));
871 function Line return Positive_Count is
873 return Line (Current_Out);
880 function Line_Length (File : File_Type) return Count is
882 FIO.Check_Write_Status (AP (File));
883 return File.Line_Length;
886 function Line_Length return Count is
888 return Line_Length (Current_Out);
897 Item : out Wide_Character;
898 End_Of_Line : out Boolean)
902 -- Start of processing for Look_Ahead
905 FIO.Check_Read_Status (AP (File));
907 -- If we are logically before a line mark, we can return immediately
909 if File.Before_LM then
911 Item := Wide_Character'Val (0);
913 -- If we are before a wide character, just return it (this can happen
914 -- if there are two calls to Look_Ahead in a row).
916 elsif File.Before_Wide_Character then
917 End_Of_Line := False;
918 Item := File.Saved_Wide_Character;
920 -- otherwise we must read a character from the input stream
927 or else (ch = EOF and then File.Is_Regular_File)
931 Item := Wide_Character'Val (0);
933 -- Case where character obtained does not represent the start of an
934 -- encoded sequence so it stands for itself and we can unget it with
937 elsif not Is_Start_Of_Encoding
938 (Character'Val (ch), File.WC_Method)
940 End_Of_Line := False;
942 Item := Wide_Character'Val (ch);
944 -- For the start of an encoding, we read the character using the
945 -- Get_Wide_Char routine. It will occupy more than one byte so we
946 -- can't put it back with ungetc. Instead we save it in the control
947 -- block, setting a flag that everyone interested in reading
948 -- characters must test before reading the stream.
951 Item := Get_Wide_Char (Character'Val (ch), File);
952 End_Of_Line := False;
953 File.Saved_Wide_Character := Item;
954 File.Before_Wide_Character := True;
960 (Item : out Wide_Character;
961 End_Of_Line : out Boolean)
964 Look_Ahead (Current_In, Item, End_Of_Line);
971 function Mode (File : File_Type) return File_Mode is
973 return To_TIO (FIO.Mode (AP (File)));
980 function Name (File : File_Type) return String is
982 return FIO.Name (AP (File));
991 Spacing : Positive_Count := 1)
994 -- Raise Constraint_Error if out of range value. The reason for this
995 -- explicit test is that we don't want junk values around, even if
996 -- checks are off in the caller.
998 if not Spacing'Valid then
999 raise Constraint_Error;
1002 FIO.Check_Write_Status (AP (File));
1004 for K in 1 .. Spacing loop
1006 File.Line := File.Line + 1;
1008 if File.Page_Length /= 0
1009 and then File.Line > File.Page_Length
1013 File.Page := File.Page + 1;
1020 procedure New_Line (Spacing : Positive_Count := 1) is
1022 New_Line (Current_Out, Spacing);
1029 procedure New_Page (File : File_Type) is
1031 FIO.Check_Write_Status (AP (File));
1033 if File.Col /= 1 or else File.Line = 1 then
1038 File.Page := File.Page + 1;
1043 procedure New_Page is
1045 New_Page (Current_Out);
1052 function Nextc (File : File_Type) return int is
1056 ch := fgetc (File.Stream);
1059 if ferror (File.Stream) /= 0 then
1064 if ungetc (ch, File.Stream) = EOF then
1077 (File : in out File_Type;
1080 Form : String := "")
1082 Dummy_File_Control_Block : Wide_Text_AFCB;
1083 pragma Warnings (Off, Dummy_File_Control_Block);
1084 -- Yes, we know this is never assigned a value, only the tag
1085 -- is used for dispatching purposes, so that's expected.
1088 FIO.Open (File_Ptr => AP (File),
1089 Dummy_FCB => Dummy_File_Control_Block,
1090 Mode => To_FCB (Mode),
1105 -- Note: we assume that it is impossible in practice for the page
1106 -- to exceed the value of Count'Last, i.e. no check is required for
1107 -- overflow raising layout error.
1109 function Page (File : File_Type) return Positive_Count is
1111 FIO.Check_File_Open (AP (File));
1115 function Page return Positive_Count is
1117 return Page (Current_Out);
1124 function Page_Length (File : File_Type) return Count is
1126 FIO.Check_Write_Status (AP (File));
1127 return File.Page_Length;
1130 function Page_Length return Count is
1132 return Page_Length (Current_Out);
1141 Item : Wide_Character)
1143 procedure Out_Char (C : Character);
1144 -- Procedure to output one character of a wide character sequence
1146 procedure WC_Out is new Wide_Char_To_Char_Sequence (Out_Char);
1152 procedure Out_Char (C : Character) is
1154 Putc (Character'Pos (C), File);
1157 -- Start of processing for Put
1160 FIO.Check_Write_Status (AP (File));
1161 WC_Out (Item, File.WC_Method);
1162 File.Col := File.Col + 1;
1165 procedure Put (Item : Wide_Character) is
1167 Put (Current_Out, Item);
1179 for J in Item'Range loop
1180 Put (File, Item (J));
1184 procedure Put (Item : Wide_String) is
1186 Put (Current_Out, Item);
1202 procedure Put_Line (Item : Wide_String) is
1204 Put (Current_Out, Item);
1205 New_Line (Current_Out);
1212 procedure Putc (ch : int; File : File_Type) is
1214 if fputc (ch, File.Stream) = EOF then
1223 -- This is the primitive Stream Read routine, used when a Text_IO file
1224 -- is treated directly as a stream using Text_IO.Streams.Stream.
1227 (File : in out Wide_Text_AFCB;
1228 Item : out Stream_Element_Array;
1229 Last : out Stream_Element_Offset)
1232 pragma Unreferenced (Discard_ch);
1235 -- Need to deal with Before_Wide_Character ???
1237 if File.Mode /= FCB.In_File then
1241 -- Deal with case where our logical and physical position do not match
1242 -- because of being after an LM or LM-PM sequence when in fact we are
1243 -- logically positioned before it.
1245 if File.Before_LM then
1247 -- If we are before a PM, then it is possible for a stream read
1248 -- to leave us after the LM and before the PM, which is a bit
1249 -- odd. The easiest way to deal with this is to unget the PM,
1250 -- so we are indeed positioned between the characters. This way
1251 -- further stream read operations will work correctly, and the
1252 -- effect on text processing is a little weird, but what can
1253 -- be expected if stream and text input are mixed this way?
1255 if File.Before_LM_PM then
1256 Discard_ch := ungetc (PM, File.Stream);
1257 File.Before_LM_PM := False;
1260 File.Before_LM := False;
1262 Item (Item'First) := Stream_Element (Character'Pos (ASCII.LF));
1264 if Item'Length = 1 then
1270 Stream_Element_Offset
1271 (fread (buffer => Item'Address,
1272 index => size_t (Item'First + 1),
1274 count => Item'Length - 1,
1275 stream => File.Stream));
1281 -- Now we do the read. Since this is a text file, it is normally in
1282 -- text mode, but stream data must be read in binary mode, so we
1283 -- temporarily set binary mode for the read, resetting it after.
1284 -- These calls have no effect in a system (like Unix) where there is
1285 -- no distinction between text and binary files.
1287 set_binary_mode (fileno (File.Stream));
1291 Stream_Element_Offset
1292 (fread (Item'Address, 1, Item'Length, File.Stream)) - 1;
1294 if Last < Item'Last then
1295 if ferror (File.Stream) /= 0 then
1300 set_text_mode (fileno (File.Stream));
1308 (File : in out File_Type;
1312 -- Don't allow change of mode for current file (RM A.10.2(5))
1314 if (File = Current_In or else
1315 File = Current_Out or else
1316 File = Current_Error)
1317 and then To_FCB (Mode) /= File.Mode
1322 Terminate_Line (File);
1323 FIO.Reset (AP (File)'Unrestricted_Access, To_FCB (Mode));
1327 File.Line_Length := 0;
1328 File.Page_Length := 0;
1329 File.Before_LM := False;
1330 File.Before_LM_PM := False;
1333 procedure Reset (File : in out File_Type) is
1335 Terminate_Line (File);
1336 FIO.Reset (AP (File)'Unrestricted_Access);
1340 File.Line_Length := 0;
1341 File.Page_Length := 0;
1342 File.Before_LM := False;
1343 File.Before_LM_PM := False;
1352 To : Positive_Count)
1357 -- Raise Constraint_Error if out of range value. The reason for this
1358 -- explicit test is that we don't want junk values around, even if
1359 -- checks are off in the caller.
1361 if not To'Valid then
1362 raise Constraint_Error;
1365 FIO.Check_File_Open (AP (File));
1367 if To = File.Col then
1371 if Mode (File) >= Out_File then
1372 if File.Line_Length /= 0 and then To > File.Line_Length then
1376 if To < File.Col then
1380 while File.Col < To loop
1392 File.Line := File.Line + 1;
1395 elsif ch = PM and then File.Is_Regular_File then
1396 File.Page := File.Page + 1;
1400 elsif To = File.Col then
1405 File.Col := File.Col + 1;
1411 procedure Set_Col (To : Positive_Count) is
1413 Set_Col (Current_Out, To);
1420 procedure Set_Error (File : File_Type) is
1422 FIO.Check_Write_Status (AP (File));
1423 Current_Err := File;
1430 procedure Set_Input (File : File_Type) is
1432 FIO.Check_Read_Status (AP (File));
1442 To : Positive_Count)
1445 -- Raise Constraint_Error if out of range value. The reason for this
1446 -- explicit test is that we don't want junk values around, even if
1447 -- checks are off in the caller.
1449 if not To'Valid then
1450 raise Constraint_Error;
1453 FIO.Check_File_Open (AP (File));
1455 if To = File.Line then
1459 if Mode (File) >= Out_File then
1460 if File.Page_Length /= 0 and then To > File.Page_Length then
1464 if To < File.Line then
1468 while File.Line < To loop
1473 while To /= File.Line loop
1479 procedure Set_Line (To : Positive_Count) is
1481 Set_Line (Current_Out, To);
1484 ---------------------
1485 -- Set_Line_Length --
1486 ---------------------
1488 procedure Set_Line_Length (File : File_Type; To : Count) is
1490 -- Raise Constraint_Error if out of range value. The reason for this
1491 -- explicit test is that we don't want junk values around, even if
1492 -- checks are off in the caller.
1494 if not To'Valid then
1495 raise Constraint_Error;
1498 FIO.Check_Write_Status (AP (File));
1499 File.Line_Length := To;
1500 end Set_Line_Length;
1502 procedure Set_Line_Length (To : Count) is
1504 Set_Line_Length (Current_Out, To);
1505 end Set_Line_Length;
1511 procedure Set_Output (File : File_Type) is
1513 FIO.Check_Write_Status (AP (File));
1514 Current_Out := File;
1517 ---------------------
1518 -- Set_Page_Length --
1519 ---------------------
1521 procedure Set_Page_Length (File : File_Type; To : Count) is
1523 -- Raise Constraint_Error if out of range value. The reason for this
1524 -- explicit test is that we don't want junk values around, even if
1525 -- checks are off in the caller.
1527 if not To'Valid then
1528 raise Constraint_Error;
1531 FIO.Check_Write_Status (AP (File));
1532 File.Page_Length := To;
1533 end Set_Page_Length;
1535 procedure Set_Page_Length (To : Count) is
1537 Set_Page_Length (Current_Out, To);
1538 end Set_Page_Length;
1544 procedure Set_WCEM (File : in out File_Type) is
1549 File.WC_Method := WCEM_Brackets;
1550 FIO.Form_Parameter (File.Form.all, "wcem", Start, Stop);
1553 File.WC_Method := WCEM_Brackets;
1556 if Stop = Start then
1557 for J in WC_Encoding_Letters'Range loop
1558 if File.Form (Start) = WC_Encoding_Letters (J) then
1559 File.WC_Method := J;
1566 raise Use_Error with "invalid WCEM form parameter";
1576 Spacing : Positive_Count := 1)
1581 -- Raise Constraint_Error if out of range value. The reason for this
1582 -- explicit test is that we don't want junk values around, even if
1583 -- checks are off in the caller.
1585 if not Spacing'Valid then
1586 raise Constraint_Error;
1589 FIO.Check_Read_Status (AP (File));
1591 for L in 1 .. Spacing loop
1592 if File.Before_LM then
1593 File.Before_LM := False;
1594 File.Before_LM_PM := False;
1599 -- If at end of file now, then immediately raise End_Error. Note
1600 -- that we can never be positioned between a line mark and a page
1601 -- mark, so if we are at the end of file, we cannot logically be
1602 -- before the implicit page mark that is at the end of the file.
1604 -- For the same reason, we do not need an explicit check for a
1605 -- page mark. If there is a FF in the middle of a line, the file
1606 -- is not in canonical format and we do not care about the page
1607 -- numbers for files other than ones in canonical format.
1613 -- If not at end of file, then loop till we get to an LM or EOF.
1614 -- The latter case happens only in non-canonical files where the
1615 -- last line is not terminated by LM, but we don't want to blow
1616 -- up for such files, so we assume an implicit LM in this case.
1619 exit when ch = LM or ch = EOF;
1624 -- We have got past a line mark, now, for a regular file only,
1625 -- see if a page mark immediately follows this line mark and
1626 -- if so, skip past the page mark as well. We do not do this
1627 -- for non-regular files, since it would cause an undesirable
1628 -- wait for an additional character.
1631 File.Line := File.Line + 1;
1633 if File.Before_LM_PM then
1634 File.Page := File.Page + 1;
1636 File.Before_LM_PM := False;
1638 elsif File.Is_Regular_File then
1641 -- Page mark can be explicit, or implied at the end of the file
1643 if (ch = PM or else ch = EOF)
1644 and then File.Is_Regular_File
1646 File.Page := File.Page + 1;
1654 File.Before_Wide_Character := False;
1657 procedure Skip_Line (Spacing : Positive_Count := 1) is
1659 Skip_Line (Current_In, Spacing);
1666 procedure Skip_Page (File : File_Type) is
1670 FIO.Check_Read_Status (AP (File));
1672 -- If at page mark already, just skip it
1674 if File.Before_LM_PM then
1675 File.Before_LM := False;
1676 File.Before_LM_PM := False;
1677 File.Page := File.Page + 1;
1683 -- This is a bit tricky, if we are logically before an LM then
1684 -- it is not an error if we are at an end of file now, since we
1685 -- are not really at it.
1687 if File.Before_LM then
1688 File.Before_LM := False;
1689 File.Before_LM_PM := False;
1692 -- Otherwise we do raise End_Error if we are at the end of file now
1702 -- Now we can just rumble along to the next page mark, or to the
1703 -- end of file, if that comes first. The latter case happens when
1704 -- the page mark is implied at the end of file.
1708 or else (ch = PM and then File.Is_Regular_File);
1712 File.Page := File.Page + 1;
1715 File.Before_Wide_Character := False;
1718 procedure Skip_Page is
1720 Skip_Page (Current_In);
1723 --------------------
1724 -- Standard_Error --
1725 --------------------
1727 function Standard_Error return File_Type is
1729 return Standard_Err;
1732 function Standard_Error return File_Access is
1734 return Standard_Err'Access;
1737 --------------------
1738 -- Standard_Input --
1739 --------------------
1741 function Standard_Input return File_Type is
1746 function Standard_Input return File_Access is
1748 return Standard_In'Access;
1751 ---------------------
1752 -- Standard_Output --
1753 ---------------------
1755 function Standard_Output return File_Type is
1757 return Standard_Out;
1758 end Standard_Output;
1760 function Standard_Output return File_Access is
1762 return Standard_Out'Access;
1763 end Standard_Output;
1765 --------------------
1766 -- Terminate_Line --
1767 --------------------
1769 procedure Terminate_Line (File : File_Type) is
1771 FIO.Check_File_Open (AP (File));
1773 -- For file other than In_File, test for needing to terminate last line
1775 if Mode (File) /= In_File then
1777 -- If not at start of line definition need new line
1779 if File.Col /= 1 then
1782 -- For files other than standard error and standard output, we
1783 -- make sure that an empty file has a single line feed, so that
1784 -- it is properly formatted. We avoid this for the standard files
1785 -- because it is too much of a nuisance to have these odd line
1786 -- feeds when nothing has been written to the file.
1788 elsif (File /= Standard_Err and then File /= Standard_Out)
1789 and then (File.Line = 1 and then File.Page = 1)
1800 procedure Ungetc (ch : int; File : File_Type) is
1803 if ungetc (ch, File.Stream) = EOF then
1813 -- This is the primitive Stream Write routine, used when a Text_IO file
1814 -- is treated directly as a stream using Text_IO.Streams.Stream.
1817 (File : in out Wide_Text_AFCB;
1818 Item : Stream_Element_Array)
1820 pragma Warnings (Off, File);
1821 -- Because in this implementation we don't need IN OUT, we only read
1823 Siz : constant size_t := Item'Length;
1826 if File.Mode = FCB.In_File then
1830 -- Now we do the write. Since this is a text file, it is normally in
1831 -- text mode, but stream data must be written in binary mode, so we
1832 -- temporarily set binary mode for the write, resetting it after.
1833 -- These calls have no effect in a system (like Unix) where there is
1834 -- no distinction between text and binary files.
1836 set_binary_mode (fileno (File.Stream));
1838 if fwrite (Item'Address, 1, Siz, File.Stream) /= Siz then
1842 set_text_mode (fileno (File.Stream));
1845 -- Use "preallocated" strings to avoid calling "new" during the
1846 -- elaboration of the run time. This is needed in the tasking case to
1847 -- avoid calling Task_Lock too early. A filename is expected to end with
1848 -- a null character in the runtime, here the null characters are added
1849 -- just to have a correct filename length.
1851 Err_Name : aliased String := "*stderr" & ASCII.NUL;
1852 In_Name : aliased String := "*stdin" & ASCII.NUL;
1853 Out_Name : aliased String := "*stdout" & ASCII.NUL;
1856 -------------------------------
1857 -- Initialize Standard Files --
1858 -------------------------------
1860 for J in WC_Encoding_Method loop
1861 if WC_Encoding = WC_Encoding_Letters (J) then
1866 -- Note: the names in these files are bogus, and probably it would be
1867 -- better for these files to have no names, but the ACVC test insist!
1868 -- We use names that are bound to fail in open etc.
1870 Standard_Err.Stream := stderr;
1871 Standard_Err.Name := Err_Name'Access;
1872 Standard_Err.Form := Null_Str'Unrestricted_Access;
1873 Standard_Err.Mode := FCB.Out_File;
1874 Standard_Err.Is_Regular_File := is_regular_file (fileno (stderr)) /= 0;
1875 Standard_Err.Is_Temporary_File := False;
1876 Standard_Err.Is_System_File := True;
1877 Standard_Err.Is_Text_File := True;
1878 Standard_Err.Access_Method := 'T';
1879 Standard_Err.Self := Standard_Err;
1880 Standard_Err.WC_Method := Default_WCEM;
1882 Standard_In.Stream := stdin;
1883 Standard_In.Name := In_Name'Access;
1884 Standard_In.Form := Null_Str'Unrestricted_Access;
1885 Standard_In.Mode := FCB.In_File;
1886 Standard_In.Is_Regular_File := is_regular_file (fileno (stdin)) /= 0;
1887 Standard_In.Is_Temporary_File := False;
1888 Standard_In.Is_System_File := True;
1889 Standard_In.Is_Text_File := True;
1890 Standard_In.Access_Method := 'T';
1891 Standard_In.Self := Standard_In;
1892 Standard_In.WC_Method := Default_WCEM;
1894 Standard_Out.Stream := stdout;
1895 Standard_Out.Name := Out_Name'Access;
1896 Standard_Out.Form := Null_Str'Unrestricted_Access;
1897 Standard_Out.Mode := FCB.Out_File;
1898 Standard_Out.Is_Regular_File := is_regular_file (fileno (stdout)) /= 0;
1899 Standard_Out.Is_Temporary_File := False;
1900 Standard_Out.Is_System_File := True;
1901 Standard_Out.Is_Text_File := True;
1902 Standard_Out.Access_Method := 'T';
1903 Standard_Out.Self := Standard_Out;
1904 Standard_Out.WC_Method := Default_WCEM;
1906 FIO.Chain_File (AP (Standard_In));
1907 FIO.Chain_File (AP (Standard_Out));
1908 FIO.Chain_File (AP (Standard_Err));
1910 FIO.Make_Unbuffered (AP (Standard_Out));
1911 FIO.Make_Unbuffered (AP (Standard_Err));
1913 end Ada.Wide_Text_IO;