1 ------------------------------------------------------------------------------
3 -- GNAT RUN-TIME COMPONENTS --
5 -- A D A . W I D E _ W I D E _ T E X T _ I O --
9 -- Copyright (C) 1992-2007, 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.Exceptions; use Ada.Exceptions;
35 with Ada.Streams; use Ada.Streams;
36 with Interfaces.C_Streams; use Interfaces.C_Streams;
40 with System.WCh_Cnv; use System.WCh_Cnv;
41 with System.WCh_Con; use System.WCh_Con;
43 with Ada.Unchecked_Conversion;
44 with Ada.Unchecked_Deallocation;
46 pragma Elaborate_All (System.File_IO);
47 -- Needed because of calls to Chain_File in package body elaboration
49 package body Ada.Wide_Wide_Text_IO is
51 package FIO renames System.File_IO;
53 subtype AP is FCB.AFCB_Ptr;
55 function To_FCB is new Ada.Unchecked_Conversion (File_Mode, FCB.File_Mode);
56 function To_TIO is new Ada.Unchecked_Conversion (FCB.File_Mode, File_Mode);
57 use type FCB.File_Mode;
59 use type System.CRTL.size_t;
61 WC_Encoding : Character;
62 pragma Import (C, WC_Encoding, "__gl_wc_encoding");
64 -----------------------
65 -- Local Subprograms --
66 -----------------------
68 function Getc_Immed (File : File_Type) return int;
69 -- This routine is identical to Getc, except that the read is done in
70 -- Get_Immediate mode (i.e. without waiting for a line return).
72 function Get_Wide_Wide_Char_Immed
74 File : File_Type) return Wide_Wide_Character;
75 -- This routine is identical to Get_Wide_Wide_Char, except that the reads
76 -- are done in Get_Immediate mode (i.e. without waiting for a line return).
78 procedure Set_WCEM (File : in out File_Type);
79 -- Called by Open and Create to set the wide character encoding method
80 -- for the file, processing a WCEM form parameter if one is present.
81 -- File is IN OUT because it may be closed in case of an error.
87 function AFCB_Allocate
88 (Control_Block : Wide_Wide_Text_AFCB) return FCB.AFCB_Ptr
90 pragma Unreferenced (Control_Block);
92 return new Wide_Wide_Text_AFCB;
99 procedure AFCB_Close (File : not null access Wide_Wide_Text_AFCB) is
101 -- If the file being closed is one of the current files, then close
102 -- the corresponding current file. It is not clear that this action
103 -- is required (RM A.10.3(23)) but it seems reasonable, and besides
104 -- ACVC test CE3208A expects this behavior.
106 if File_Type (File) = Current_In then
108 elsif File_Type (File) = Current_Out then
110 elsif File_Type (File) = Current_Err then
114 Terminate_Line (File_Type (File));
121 procedure AFCB_Free (File : not null access Wide_Wide_Text_AFCB) is
122 type FCB_Ptr is access all Wide_Wide_Text_AFCB;
123 FT : FCB_Ptr := FCB_Ptr (File);
125 procedure Free is new
126 Ada.Unchecked_Deallocation (Wide_Wide_Text_AFCB, FCB_Ptr);
136 procedure Close (File : in out File_Type) is
138 FIO.Close (AP (File));
145 -- Note: we assume that it is impossible in practice for the column
146 -- to exceed the value of Count'Last, i.e. no check is required for
147 -- overflow raising layout error.
149 function Col (File : File_Type) return Positive_Count is
151 FIO.Check_File_Open (AP (File));
155 function Col return Positive_Count is
157 return Col (Current_Out);
165 (File : in out File_Type;
166 Mode : File_Mode := Out_File;
170 Dummy_File_Control_Block : Wide_Wide_Text_AFCB;
171 pragma Warnings (Off, Dummy_File_Control_Block);
172 -- Yes, we know this is never assigned a value, only the tag
173 -- is used for dispatching purposes, so that's expected.
176 FIO.Open (File_Ptr => AP (File),
177 Dummy_FCB => Dummy_File_Control_Block,
178 Mode => To_FCB (Mode),
191 function Current_Error return File_Type is
196 function Current_Error return File_Access is
198 return Current_Err'Access;
205 function Current_Input return File_Type is
210 function Current_Input return File_Access is
212 return Current_In'Access;
219 function Current_Output return File_Type is
224 function Current_Output return File_Access is
226 return Current_Out'Access;
233 procedure Delete (File : in out File_Type) is
235 FIO.Delete (AP (File));
242 function End_Of_File (File : File_Type) return Boolean is
246 FIO.Check_Read_Status (AP (File));
248 if File.Before_Wide_Wide_Character then
251 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_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_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_Wide_Character)
417 FIO.Check_Read_Status (AP (File));
419 if File.Before_Wide_Wide_Character then
420 File.Before_Wide_Wide_Character := False;
421 Item := File.Saved_Wide_Wide_Character;
424 Get_Character (File, C);
425 Item := Get_Wide_Wide_Char (C, File);
429 procedure Get (Item : out Wide_Wide_Character) is
431 Get (Current_In, Item);
436 Item : out Wide_Wide_String)
439 for J in Item'Range loop
440 Get (File, Item (J));
444 procedure Get (Item : out Wide_Wide_String) is
446 Get (Current_In, Item);
453 procedure Get_Character
455 Item : out Character)
460 if File.Before_LM then
461 File.Before_LM := False;
462 File.Before_LM_PM := False;
465 if File.Before_LM_PM then
467 File.Page := File.Page + 1;
468 File.Before_LM_PM := False;
471 File.Line := File.Line + 1;
482 File.Line := File.Line + 1;
485 elsif ch = PM and then File.Is_Regular_File then
486 File.Page := File.Page + 1;
490 Item := Character'Val (ch);
491 File.Col := File.Col + 1;
501 procedure Get_Immediate
503 Item : out Wide_Wide_Character)
508 FIO.Check_Read_Status (AP (File));
510 if File.Before_Wide_Wide_Character then
511 File.Before_Wide_Wide_Character := False;
512 Item := File.Saved_Wide_Wide_Character;
514 elsif File.Before_LM then
515 File.Before_LM := False;
516 File.Before_LM_PM := False;
517 Item := Wide_Wide_Character'Val (LM);
520 ch := Getc_Immed (File);
525 Item := Get_Wide_Wide_Char_Immed (Character'Val (ch), File);
530 procedure Get_Immediate
531 (Item : out Wide_Wide_Character)
534 Get_Immediate (Current_In, Item);
537 procedure Get_Immediate
539 Item : out Wide_Wide_Character;
540 Available : out Boolean)
545 FIO.Check_Read_Status (AP (File));
548 if File.Before_Wide_Wide_Character then
549 File.Before_Wide_Wide_Character := False;
550 Item := File.Saved_Wide_Wide_Character;
552 elsif File.Before_LM then
553 File.Before_LM := False;
554 File.Before_LM_PM := False;
555 Item := Wide_Wide_Character'Val (LM);
558 ch := Getc_Immed (File);
563 Item := Get_Wide_Wide_Char_Immed (Character'Val (ch), File);
568 procedure Get_Immediate
569 (Item : out Wide_Wide_Character;
570 Available : out Boolean)
573 Get_Immediate (Current_In, Item, Available);
582 Item : out Wide_Wide_String;
586 FIO.Check_Read_Status (AP (File));
587 Last := Item'First - 1;
589 -- Immediate exit for null string, this is a case in which we do not
590 -- need to test for end of file and we do not skip a line mark under
591 -- any circumstances.
593 if Last >= Item'Last then
597 -- Here we have at least one character, if we are immediately before
598 -- a line mark, then we will just skip past it storing no characters.
600 if File.Before_LM then
601 File.Before_LM := False;
602 File.Before_LM_PM := False;
604 -- Otherwise we need to read some characters
607 -- If we are at the end of file now, it means we are trying to
608 -- skip a file terminator and we raise End_Error (RM A.10.7(20))
610 if Nextc (File) = EOF then
614 -- Loop through characters in string
617 -- Exit the loop if read is terminated by encountering line mark
618 -- Note that the use of Skip_Line here ensures we properly deal
619 -- with setting the page and line numbers.
621 if End_Of_Line (File) then
626 -- Otherwise store the character, note that we know that ch is
627 -- something other than LM or EOF. It could possibly be a page
628 -- mark if there is a stray page mark in the middle of a line,
629 -- but this is not an official page mark in any case, since
630 -- official page marks can only follow a line mark. The whole
631 -- page business is pretty much nonsense anyway, so we do not
632 -- want to waste time trying to make sense out of non-standard
633 -- page marks in the file! This means that the behavior of
634 -- Get_Line is different from repeated Get of a character, but
635 -- that's too bad. We only promise that page numbers etc make
636 -- sense if the file is formatted in a standard manner.
638 -- Note: we do not adjust the column number because it is quicker
639 -- to adjust it once at the end of the operation than incrementing
640 -- it each time around the loop.
643 Get (File, Item (Last));
645 -- All done if the string is full, this is the case in which
646 -- we do not skip the following line mark. We need to adjust
647 -- the column number in this case.
649 if Last = Item'Last then
650 File.Col := File.Col + Count (Item'Length);
654 -- Exit from the loop if we are at the end of file. This happens
655 -- if we have a last line that is not terminated with a line mark.
656 -- In this case we consider that there is an implied line mark;
657 -- this is a non-standard file, but we will treat it nicely.
659 exit when Nextc (File) = EOF;
665 (Item : out Wide_Wide_String;
669 Get_Line (Current_In, Item, Last);
672 function Get_Line (File : File_Type) return Wide_Wide_String is
673 Buffer : Wide_Wide_String (1 .. 500);
676 function Get_Rest (S : Wide_Wide_String) return Wide_Wide_String;
677 -- This is a recursive function that reads the rest of the line and
678 -- returns it. S is the part read so far.
684 function Get_Rest (S : Wide_Wide_String) return Wide_Wide_String is
686 -- Each time we allocate a buffer the same size as what we have
687 -- read so far. This limits us to a logarithmic number of calls
688 -- to Get_Rest and also ensures only a linear use of stack space.
690 Buffer : Wide_Wide_String (1 .. S'Length);
694 Get_Line (File, Buffer, Last);
697 R : constant Wide_Wide_String := S & Buffer (1 .. Last);
699 if Last < Buffer'Last then
707 -- Start of processing for Get_Line
710 Get_Line (File, Buffer, Last);
712 if Last < Buffer'Last then
713 return Buffer (1 .. Last);
715 return Get_Rest (Buffer (1 .. Last));
719 function Get_Line return Wide_Wide_String is
721 return Get_Line (Current_In);
724 ------------------------
725 -- Get_Wide_Wide_Char --
726 ------------------------
728 function Get_Wide_Wide_Char
730 File : File_Type) return Wide_Wide_Character
732 function In_Char return Character;
733 -- Function used to obtain additional characters it the wide character
734 -- sequence is more than one character long.
736 function WC_In is new Char_Sequence_To_UTF_32 (In_Char);
742 function In_Char return Character is
743 ch : constant Integer := Getc (File);
748 return Character'Val (ch);
752 -- Start of processing for Get_Wide_Wide_Char
755 return Wide_Wide_Character'Val (WC_In (C, File.WC_Method));
756 end Get_Wide_Wide_Char;
758 ------------------------------
759 -- Get_Wide_Wide_Char_Immed --
760 ------------------------------
762 function Get_Wide_Wide_Char_Immed
764 File : File_Type) return Wide_Wide_Character
766 function In_Char return Character;
767 -- Function used to obtain additional characters it the wide character
768 -- sequence is more than one character long.
770 function WC_In is new Char_Sequence_To_UTF_32 (In_Char);
776 function In_Char return Character is
777 ch : constant Integer := Getc_Immed (File);
782 return Character'Val (ch);
786 -- Start of processing for Get_Wide_Wide_Char_Immed
789 return Wide_Wide_Character'Val (WC_In (C, File.WC_Method));
790 end Get_Wide_Wide_Char_Immed;
796 function Getc (File : File_Type) return int is
800 ch := fgetc (File.Stream);
802 if ch = EOF and then ferror (File.Stream) /= 0 then
813 function Getc_Immed (File : File_Type) return int is
817 procedure getc_immediate
818 (stream : FILEs; ch : out int; end_of_file : out int);
819 pragma Import (C, getc_immediate, "getc_immediate");
822 FIO.Check_Read_Status (AP (File));
824 if File.Before_LM then
825 File.Before_LM := False;
826 File.Before_LM_PM := False;
830 getc_immediate (File.Stream, ch, end_of_file);
832 if ferror (File.Stream) /= 0 then
834 elsif end_of_file /= 0 then
846 function Is_Open (File : File_Type) return Boolean is
848 return FIO.Is_Open (AP (File));
855 -- Note: we assume that it is impossible in practice for the line
856 -- to exceed the value of Count'Last, i.e. no check is required for
857 -- overflow raising layout error.
859 function Line (File : File_Type) return Positive_Count is
861 FIO.Check_File_Open (AP (File));
865 function Line return Positive_Count is
867 return Line (Current_Out);
874 function Line_Length (File : File_Type) return Count is
876 FIO.Check_Write_Status (AP (File));
877 return File.Line_Length;
880 function Line_Length return Count is
882 return Line_Length (Current_Out);
891 Item : out Wide_Wide_Character;
892 End_Of_Line : out Boolean)
896 -- Start of processing for Look_Ahead
899 FIO.Check_Read_Status (AP (File));
901 -- If we are logically before a line mark, we can return immediately
903 if File.Before_LM then
905 Item := Wide_Wide_Character'Val (0);
907 -- If we are before a wide character, just return it (this happens
908 -- if there are two calls to Look_Ahead in a row).
910 elsif File.Before_Wide_Wide_Character then
911 End_Of_Line := False;
912 Item := File.Saved_Wide_Wide_Character;
914 -- otherwise we must read a character from the input stream
921 or else (ch = EOF and then File.Is_Regular_File)
925 Item := Wide_Wide_Character'Val (0);
927 -- If the character is in the range 16#0000# to 16#007F# it stands
928 -- for itself and occupies a single byte, so we can unget it with
931 elsif ch <= 16#0080# then
932 End_Of_Line := False;
934 Item := Wide_Wide_Character'Val (ch);
936 -- For a character above this range, we read the character, using
937 -- the Get_Wide_Wide_Char routine. It may well occupy more than one
938 -- byte so we can't put it back with ungetc. Instead we save it in
939 -- the control block, setting a flag that everyone interested in
940 -- reading characters must test before reading the stream.
943 Item := Get_Wide_Wide_Char (Character'Val (ch), File);
944 End_Of_Line := False;
945 File.Saved_Wide_Wide_Character := Item;
946 File.Before_Wide_Wide_Character := True;
952 (Item : out Wide_Wide_Character;
953 End_Of_Line : out Boolean)
956 Look_Ahead (Current_In, Item, End_Of_Line);
963 function Mode (File : File_Type) return File_Mode is
965 return To_TIO (FIO.Mode (AP (File)));
972 function Name (File : File_Type) return String is
974 return FIO.Name (AP (File));
983 Spacing : Positive_Count := 1)
986 -- Raise Constraint_Error if out of range value. The reason for this
987 -- explicit test is that we don't want junk values around, even if
988 -- checks are off in the caller.
990 if not Spacing'Valid then
991 raise Constraint_Error;
994 FIO.Check_Write_Status (AP (File));
996 for K in 1 .. Spacing loop
998 File.Line := File.Line + 1;
1000 if File.Page_Length /= 0
1001 and then File.Line > File.Page_Length
1005 File.Page := File.Page + 1;
1012 procedure New_Line (Spacing : Positive_Count := 1) is
1014 New_Line (Current_Out, Spacing);
1021 procedure New_Page (File : File_Type) is
1023 FIO.Check_Write_Status (AP (File));
1025 if File.Col /= 1 or else File.Line = 1 then
1030 File.Page := File.Page + 1;
1035 procedure New_Page is
1037 New_Page (Current_Out);
1044 function Nextc (File : File_Type) return int is
1048 ch := fgetc (File.Stream);
1051 if ferror (File.Stream) /= 0 then
1056 if ungetc (ch, File.Stream) = EOF then
1069 (File : in out File_Type;
1072 Form : String := "")
1074 Dummy_File_Control_Block : Wide_Wide_Text_AFCB;
1075 pragma Warnings (Off, Dummy_File_Control_Block);
1076 -- Yes, we know this is never assigned a value, only the tag
1077 -- is used for dispatching purposes, so that's expected.
1080 FIO.Open (File_Ptr => AP (File),
1081 Dummy_FCB => Dummy_File_Control_Block,
1082 Mode => To_FCB (Mode),
1095 -- Note: we assume that it is impossible in practice for the page
1096 -- to exceed the value of Count'Last, i.e. no check is required for
1097 -- overflow raising layout error.
1099 function Page (File : File_Type) return Positive_Count is
1101 FIO.Check_File_Open (AP (File));
1105 function Page return Positive_Count is
1107 return Page (Current_Out);
1114 function Page_Length (File : File_Type) return Count is
1116 FIO.Check_Write_Status (AP (File));
1117 return File.Page_Length;
1120 function Page_Length return Count is
1122 return Page_Length (Current_Out);
1131 Item : Wide_Wide_Character)
1133 procedure Out_Char (C : Character);
1134 -- Procedure to output one character of a wide character sequence
1136 procedure WC_Out is new UTF_32_To_Char_Sequence (Out_Char);
1142 procedure Out_Char (C : Character) is
1144 Putc (Character'Pos (C), File);
1147 -- Start of processing for Put
1150 WC_Out (Wide_Wide_Character'Pos (Item), File.WC_Method);
1151 File.Col := File.Col + 1;
1154 procedure Put (Item : Wide_Wide_Character) is
1156 Put (Current_Out, Item);
1165 Item : Wide_Wide_String)
1168 for J in Item'Range loop
1169 Put (File, Item (J));
1173 procedure Put (Item : Wide_Wide_String) is
1175 Put (Current_Out, Item);
1184 Item : Wide_Wide_String)
1191 procedure Put_Line (Item : Wide_Wide_String) is
1193 Put (Current_Out, Item);
1194 New_Line (Current_Out);
1201 procedure Putc (ch : int; File : File_Type) is
1203 if fputc (ch, File.Stream) = EOF then
1212 -- This is the primitive Stream Read routine, used when a Text_IO file
1213 -- is treated directly as a stream using Text_IO.Streams.Stream.
1216 (File : in out Wide_Wide_Text_AFCB;
1217 Item : out Stream_Element_Array;
1218 Last : out Stream_Element_Offset)
1221 pragma Unreferenced (Discard_ch);
1224 -- Need to deal with Before_Wide_Wide_Character ???
1226 if File.Mode /= FCB.In_File then
1230 -- Deal with case where our logical and physical position do not match
1231 -- because of being after an LM or LM-PM sequence when in fact we are
1232 -- logically positioned before it.
1234 if File.Before_LM then
1236 -- If we are before a PM, then it is possible for a stream read
1237 -- to leave us after the LM and before the PM, which is a bit
1238 -- odd. The easiest way to deal with this is to unget the PM,
1239 -- so we are indeed positioned between the characters. This way
1240 -- further stream read operations will work correctly, and the
1241 -- effect on text processing is a little weird, but what can
1242 -- be expected if stream and text input are mixed this way?
1244 if File.Before_LM_PM then
1245 Discard_ch := ungetc (PM, File.Stream);
1246 File.Before_LM_PM := False;
1249 File.Before_LM := False;
1251 Item (Item'First) := Stream_Element (Character'Pos (ASCII.LF));
1253 if Item'Length = 1 then
1259 Stream_Element_Offset
1260 (fread (buffer => Item'Address,
1261 index => size_t (Item'First + 1),
1263 count => Item'Length - 1,
1264 stream => File.Stream));
1270 -- Now we do the read. Since this is a text file, it is normally in
1271 -- text mode, but stream data must be read in binary mode, so we
1272 -- temporarily set binary mode for the read, resetting it after.
1273 -- These calls have no effect in a system (like Unix) where there is
1274 -- no distinction between text and binary files.
1276 set_binary_mode (fileno (File.Stream));
1280 Stream_Element_Offset
1281 (fread (Item'Address, 1, Item'Length, File.Stream)) - 1;
1283 if Last < Item'Last then
1284 if ferror (File.Stream) /= 0 then
1289 set_text_mode (fileno (File.Stream));
1297 (File : in out File_Type;
1301 -- Don't allow change of mode for current file (RM A.10.2(5))
1303 if (File = Current_In or else
1304 File = Current_Out or else
1305 File = Current_Error)
1306 and then To_FCB (Mode) /= File.Mode
1311 Terminate_Line (File);
1312 FIO.Reset (AP (File), To_FCB (Mode));
1316 File.Line_Length := 0;
1317 File.Page_Length := 0;
1318 File.Before_LM := False;
1319 File.Before_LM_PM := False;
1322 procedure Reset (File : in out File_Type) is
1324 Terminate_Line (File);
1325 FIO.Reset (AP (File));
1329 File.Line_Length := 0;
1330 File.Page_Length := 0;
1331 File.Before_LM := False;
1332 File.Before_LM_PM := False;
1341 To : Positive_Count)
1346 -- Raise Constraint_Error if out of range value. The reason for this
1347 -- explicit test is that we don't want junk values around, even if
1348 -- checks are off in the caller.
1350 if not To'Valid then
1351 raise Constraint_Error;
1354 FIO.Check_File_Open (AP (File));
1356 if To = File.Col then
1360 if Mode (File) >= Out_File then
1361 if File.Line_Length /= 0 and then To > File.Line_Length then
1365 if To < File.Col then
1369 while File.Col < To loop
1381 File.Line := File.Line + 1;
1384 elsif ch = PM and then File.Is_Regular_File then
1385 File.Page := File.Page + 1;
1389 elsif To = File.Col then
1394 File.Col := File.Col + 1;
1400 procedure Set_Col (To : Positive_Count) is
1402 Set_Col (Current_Out, To);
1409 procedure Set_Error (File : File_Type) is
1411 FIO.Check_Write_Status (AP (File));
1412 Current_Err := File;
1419 procedure Set_Input (File : File_Type) is
1421 FIO.Check_Read_Status (AP (File));
1431 To : Positive_Count)
1434 -- Raise Constraint_Error if out of range value. The reason for this
1435 -- explicit test is that we don't want junk values around, even if
1436 -- checks are off in the caller.
1438 if not To'Valid then
1439 raise Constraint_Error;
1442 FIO.Check_File_Open (AP (File));
1444 if To = File.Line then
1448 if Mode (File) >= Out_File then
1449 if File.Page_Length /= 0 and then To > File.Page_Length then
1453 if To < File.Line then
1457 while File.Line < To loop
1462 while To /= File.Line loop
1468 procedure Set_Line (To : Positive_Count) is
1470 Set_Line (Current_Out, To);
1473 ---------------------
1474 -- Set_Line_Length --
1475 ---------------------
1477 procedure Set_Line_Length (File : File_Type; To : Count) is
1479 -- Raise Constraint_Error if out of range value. The reason for this
1480 -- explicit test is that we don't want junk values around, even if
1481 -- checks are off in the caller.
1483 if not To'Valid then
1484 raise Constraint_Error;
1487 FIO.Check_Write_Status (AP (File));
1488 File.Line_Length := To;
1489 end Set_Line_Length;
1491 procedure Set_Line_Length (To : Count) is
1493 Set_Line_Length (Current_Out, To);
1494 end Set_Line_Length;
1500 procedure Set_Output (File : File_Type) is
1502 FIO.Check_Write_Status (AP (File));
1503 Current_Out := File;
1506 ---------------------
1507 -- Set_Page_Length --
1508 ---------------------
1510 procedure Set_Page_Length (File : File_Type; To : Count) is
1512 -- Raise Constraint_Error if out of range value. The reason for this
1513 -- explicit test is that we don't want junk values around, even if
1514 -- checks are off in the caller.
1516 if not To'Valid then
1517 raise Constraint_Error;
1520 FIO.Check_Write_Status (AP (File));
1521 File.Page_Length := To;
1522 end Set_Page_Length;
1524 procedure Set_Page_Length (To : Count) is
1526 Set_Page_Length (Current_Out, To);
1527 end Set_Page_Length;
1533 procedure Set_WCEM (File : in out File_Type) is
1538 File.WC_Method := WCEM_Brackets;
1539 FIO.Form_Parameter (File.Form.all, "wcem", Start, Stop);
1542 File.WC_Method := WCEM_Brackets;
1544 elsif Start /= 0 then
1545 if Stop = Start then
1546 for J in WC_Encoding_Letters'Range loop
1547 if File.Form (Start) = WC_Encoding_Letters (J) then
1548 File.WC_Method := J;
1555 Raise_Exception (Use_Error'Identity, "invalid WCEM form parameter");
1565 Spacing : Positive_Count := 1)
1570 -- Raise Constraint_Error if out of range value. The reason for this
1571 -- explicit test is that we don't want junk values around, even if
1572 -- checks are off in the caller.
1574 if not Spacing'Valid then
1575 raise Constraint_Error;
1578 FIO.Check_Read_Status (AP (File));
1580 for L in 1 .. Spacing loop
1581 if File.Before_LM then
1582 File.Before_LM := False;
1583 File.Before_LM_PM := False;
1588 -- If at end of file now, then immediately raise End_Error. Note
1589 -- that we can never be positioned between a line mark and a page
1590 -- mark, so if we are at the end of file, we cannot logically be
1591 -- before the implicit page mark that is at the end of the file.
1593 -- For the same reason, we do not need an explicit check for a
1594 -- page mark. If there is a FF in the middle of a line, the file
1595 -- is not in canonical format and we do not care about the page
1596 -- numbers for files other than ones in canonical format.
1602 -- If not at end of file, then loop till we get to an LM or EOF.
1603 -- The latter case happens only in non-canonical files where the
1604 -- last line is not terminated by LM, but we don't want to blow
1605 -- up for such files, so we assume an implicit LM in this case.
1608 exit when ch = LM or ch = EOF;
1613 -- We have got past a line mark, now, for a regular file only,
1614 -- see if a page mark immediately follows this line mark and
1615 -- if so, skip past the page mark as well. We do not do this
1616 -- for non-regular files, since it would cause an undesirable
1617 -- wait for an additional character.
1620 File.Line := File.Line + 1;
1622 if File.Before_LM_PM then
1623 File.Page := File.Page + 1;
1625 File.Before_LM_PM := False;
1627 elsif File.Is_Regular_File then
1630 -- Page mark can be explicit, or implied at the end of the file
1632 if (ch = PM or else ch = EOF)
1633 and then File.Is_Regular_File
1635 File.Page := File.Page + 1;
1644 File.Before_Wide_Wide_Character := False;
1647 procedure Skip_Line (Spacing : Positive_Count := 1) is
1649 Skip_Line (Current_In, Spacing);
1656 procedure Skip_Page (File : File_Type) is
1660 FIO.Check_Read_Status (AP (File));
1662 -- If at page mark already, just skip it
1664 if File.Before_LM_PM then
1665 File.Before_LM := False;
1666 File.Before_LM_PM := False;
1667 File.Page := File.Page + 1;
1673 -- This is a bit tricky, if we are logically before an LM then
1674 -- it is not an error if we are at an end of file now, since we
1675 -- are not really at it.
1677 if File.Before_LM then
1678 File.Before_LM := False;
1679 File.Before_LM_PM := False;
1682 -- Otherwise we do raise End_Error if we are at the end of file now
1692 -- Now we can just rumble along to the next page mark, or to the
1693 -- end of file, if that comes first. The latter case happens when
1694 -- the page mark is implied at the end of file.
1698 or else (ch = PM and then File.Is_Regular_File);
1702 File.Page := File.Page + 1;
1705 File.Before_Wide_Wide_Character := False;
1708 procedure Skip_Page is
1710 Skip_Page (Current_In);
1713 --------------------
1714 -- Standard_Error --
1715 --------------------
1717 function Standard_Error return File_Type is
1719 return Standard_Err;
1722 function Standard_Error return File_Access is
1724 return Standard_Err'Access;
1727 --------------------
1728 -- Standard_Input --
1729 --------------------
1731 function Standard_Input return File_Type is
1736 function Standard_Input return File_Access is
1738 return Standard_In'Access;
1741 ---------------------
1742 -- Standard_Output --
1743 ---------------------
1745 function Standard_Output return File_Type is
1747 return Standard_Out;
1748 end Standard_Output;
1750 function Standard_Output return File_Access is
1752 return Standard_Out'Access;
1753 end Standard_Output;
1755 --------------------
1756 -- Terminate_Line --
1757 --------------------
1759 procedure Terminate_Line (File : File_Type) is
1761 FIO.Check_File_Open (AP (File));
1763 -- For file other than In_File, test for needing to terminate last line
1765 if Mode (File) /= In_File then
1767 -- If not at start of line definition need new line
1769 if File.Col /= 1 then
1772 -- For files other than standard error and standard output, we
1773 -- make sure that an empty file has a single line feed, so that
1774 -- it is properly formatted. We avoid this for the standard files
1775 -- because it is too much of a nuisance to have these odd line
1776 -- feeds when nothing has been written to the file.
1778 elsif (File /= Standard_Err and then File /= Standard_Out)
1779 and then (File.Line = 1 and then File.Page = 1)
1790 procedure Ungetc (ch : int; File : File_Type) is
1793 if ungetc (ch, File.Stream) = EOF then
1803 -- This is the primitive Stream Write routine, used when a Text_IO file
1804 -- is treated directly as a stream using Text_IO.Streams.Stream.
1807 (File : in out Wide_Wide_Text_AFCB;
1808 Item : Stream_Element_Array)
1810 pragma Warnings (Off, File);
1811 -- Because in this implementation we don't need IN OUT, we only read
1813 Siz : constant size_t := Item'Length;
1816 if File.Mode = FCB.In_File then
1820 -- Now we do the write. Since this is a text file, it is normally in
1821 -- text mode, but stream data must be written in binary mode, so we
1822 -- temporarily set binary mode for the write, resetting it after.
1823 -- These calls have no effect in a system (like Unix) where there is
1824 -- no distinction between text and binary files.
1826 set_binary_mode (fileno (File.Stream));
1828 if fwrite (Item'Address, 1, Siz, File.Stream) /= Siz then
1832 set_text_mode (fileno (File.Stream));
1835 -- Use "preallocated" strings to avoid calling "new" during the
1836 -- elaboration of the run time. This is needed in the tasking case to
1837 -- avoid calling Task_Lock too early. A filename is expected to end with
1838 -- a null character in the runtime, here the null characters are added
1839 -- just to have a correct filename length.
1841 Err_Name : aliased String := "*stderr" & ASCII.Nul;
1842 In_Name : aliased String := "*stdin" & ASCII.Nul;
1843 Out_Name : aliased String := "*stdout" & ASCII.Nul;
1846 -------------------------------
1847 -- Initialize Standard Files --
1848 -------------------------------
1850 for J in WC_Encoding_Method loop
1851 if WC_Encoding = WC_Encoding_Letters (J) then
1856 -- Note: the names in these files are bogus, and probably it would be
1857 -- better for these files to have no names, but the ACVC test insist!
1858 -- We use names that are bound to fail in open etc.
1860 Standard_Err.Stream := stderr;
1861 Standard_Err.Name := Err_Name'Access;
1862 Standard_Err.Form := Null_Str'Unrestricted_Access;
1863 Standard_Err.Mode := FCB.Out_File;
1864 Standard_Err.Is_Regular_File := is_regular_file (fileno (stderr)) /= 0;
1865 Standard_Err.Is_Temporary_File := False;
1866 Standard_Err.Is_System_File := True;
1867 Standard_Err.Is_Text_File := True;
1868 Standard_Err.Access_Method := 'T';
1869 Standard_Err.WC_Method := Default_WCEM;
1871 Standard_In.Stream := stdin;
1872 Standard_In.Name := In_Name'Access;
1873 Standard_In.Form := Null_Str'Unrestricted_Access;
1874 Standard_In.Mode := FCB.In_File;
1875 Standard_In.Is_Regular_File := is_regular_file (fileno (stdin)) /= 0;
1876 Standard_In.Is_Temporary_File := False;
1877 Standard_In.Is_System_File := True;
1878 Standard_In.Is_Text_File := True;
1879 Standard_In.Access_Method := 'T';
1880 Standard_In.WC_Method := Default_WCEM;
1882 Standard_Out.Stream := stdout;
1883 Standard_Out.Name := Out_Name'Access;
1884 Standard_Out.Form := Null_Str'Unrestricted_Access;
1885 Standard_Out.Mode := FCB.Out_File;
1886 Standard_Out.Is_Regular_File := is_regular_file (fileno (stdout)) /= 0;
1887 Standard_Out.Is_Temporary_File := False;
1888 Standard_Out.Is_System_File := True;
1889 Standard_Out.Is_Text_File := True;
1890 Standard_Out.Access_Method := 'T';
1891 Standard_Out.WC_Method := Default_WCEM;
1893 FIO.Chain_File (AP (Standard_In));
1894 FIO.Chain_File (AP (Standard_Out));
1895 FIO.Chain_File (AP (Standard_Err));
1897 FIO.Make_Unbuffered (AP (Standard_Out));
1898 FIO.Make_Unbuffered (AP (Standard_Err));
1900 end Ada.Wide_Wide_Text_IO;