1 ------------------------------------------------------------------------------
3 -- GNAT RUN-TIME COMPONENTS --
5 -- A D A . W I D E _ T E X T _ I O --
9 -- Copyright (C) 1992-2006, 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 Unchecked_Conversion;
44 with 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_Text_IO is
51 package FIO renames System.File_IO;
53 subtype AP is FCB.AFCB_Ptr;
55 function To_FCB is new Unchecked_Conversion (File_Mode, FCB.File_Mode);
56 function To_TIO is new 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_Char_Immed
74 File : File_Type) return Wide_Character;
75 -- This routine is identical to Get_Wide_Char, except that the reads are
76 -- 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_Text_AFCB) return FCB.AFCB_Ptr
90 pragma Unreferenced (Control_Block);
92 return new Wide_Text_AFCB;
99 procedure AFCB_Close (File : not null access 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_Text_AFCB) is
122 type FCB_Ptr is access all Wide_Text_AFCB;
123 FT : FCB_Ptr := FCB_Ptr (File);
125 procedure Free is new Unchecked_Deallocation (Wide_Text_AFCB, FCB_Ptr);
135 procedure Close (File : in out File_Type) is
137 FIO.Close (AP (File));
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),
190 function Current_Error return File_Type is
195 function Current_Error return File_Access is
197 return Current_Err'Access;
204 function Current_Input return File_Type is
209 function Current_Input return File_Access is
211 return Current_In'Access;
218 function Current_Output return File_Type is
223 function Current_Output return File_Access is
225 return Current_Out'Access;
232 procedure Delete (File : in out File_Type) is
234 FIO.Delete (AP (File));
241 function End_Of_File (File : File_Type) return Boolean is
245 FIO.Check_Read_Status (AP (File));
247 if File.Before_Wide_Character then
250 elsif File.Before_LM then
252 if File.Before_LM_PM then
253 return Nextc (File) = EOF;
267 File.Before_LM := True;
271 -- Here we are just past the line mark with Before_LM set so that we
272 -- do not have to try to back up past the LM, thus avoiding the need
273 -- to back up more than one character.
280 elsif ch = PM and then File.Is_Regular_File then
281 File.Before_LM_PM := True;
282 return Nextc (File) = EOF;
284 -- Here if neither EOF nor PM followed end of line
293 function End_Of_File return Boolean is
295 return End_Of_File (Current_In);
302 function End_Of_Line (File : File_Type) return Boolean is
306 FIO.Check_Read_Status (AP (File));
308 if File.Before_Wide_Character then
311 elsif File.Before_LM then
327 function End_Of_Line return Boolean is
329 return End_Of_Line (Current_In);
336 function End_Of_Page (File : File_Type) return Boolean is
340 FIO.Check_Read_Status (AP (File));
342 if not File.Is_Regular_File then
345 elsif File.Before_Wide_Character then
348 elsif File.Before_LM then
349 if File.Before_LM_PM then
364 File.Before_LM := True;
368 -- Here we are just past the line mark with Before_LM set so that we
369 -- do not have to try to back up past the LM, thus avoiding the need
370 -- to back up more than one character.
374 return ch = PM or else ch = EOF;
377 function End_Of_Page return Boolean is
379 return End_Of_Page (Current_In);
386 procedure Flush (File : File_Type) is
388 FIO.Flush (AP (File));
400 function Form (File : File_Type) return String is
402 return FIO.Form (AP (File));
411 Item : out Wide_Character)
416 FIO.Check_Read_Status (AP (File));
418 if File.Before_Wide_Character then
419 File.Before_Wide_Character := False;
420 Item := File.Saved_Wide_Character;
423 Get_Character (File, C);
424 Item := Get_Wide_Char (C, File);
428 procedure Get (Item : out Wide_Character) is
430 Get (Current_In, Item);
435 Item : out Wide_String)
438 for J in Item'Range loop
439 Get (File, Item (J));
443 procedure Get (Item : out Wide_String) is
445 Get (Current_In, Item);
452 procedure Get_Character
454 Item : out Character)
459 if File.Before_LM then
460 File.Before_LM := False;
461 File.Before_LM_PM := False;
464 if File.Before_LM_PM then
466 File.Page := File.Page + 1;
467 File.Before_LM_PM := False;
470 File.Line := File.Line + 1;
481 File.Line := File.Line + 1;
484 elsif ch = PM and then File.Is_Regular_File then
485 File.Page := File.Page + 1;
489 Item := Character'Val (ch);
490 File.Col := File.Col + 1;
500 procedure Get_Immediate
502 Item : out Wide_Character)
507 FIO.Check_Read_Status (AP (File));
509 if File.Before_Wide_Character then
510 File.Before_Wide_Character := False;
511 Item := File.Saved_Wide_Character;
513 elsif File.Before_LM then
514 File.Before_LM := False;
515 File.Before_LM_PM := False;
516 Item := Wide_Character'Val (LM);
519 ch := Getc_Immed (File);
524 Item := Get_Wide_Char_Immed (Character'Val (ch), File);
529 procedure Get_Immediate
530 (Item : out Wide_Character)
533 Get_Immediate (Current_In, Item);
536 procedure Get_Immediate
538 Item : out Wide_Character;
539 Available : out Boolean)
544 FIO.Check_Read_Status (AP (File));
547 if File.Before_Wide_Character then
548 File.Before_Wide_Character := False;
549 Item := File.Saved_Wide_Character;
551 elsif File.Before_LM then
552 File.Before_LM := False;
553 File.Before_LM_PM := False;
554 Item := Wide_Character'Val (LM);
557 ch := Getc_Immed (File);
562 Item := Get_Wide_Char_Immed (Character'Val (ch), File);
567 procedure Get_Immediate
568 (Item : out Wide_Character;
569 Available : out Boolean)
572 Get_Immediate (Current_In, Item, Available);
581 Item : out Wide_String;
585 FIO.Check_Read_Status (AP (File));
586 Last := Item'First - 1;
588 -- Immediate exit for null string, this is a case in which we do not
589 -- need to test for end of file and we do not skip a line mark under
590 -- any circumstances.
592 if Last >= Item'Last then
596 -- Here we have at least one character, if we are immediately before
597 -- a line mark, then we will just skip past it storing no characters.
599 if File.Before_LM then
600 File.Before_LM := False;
601 File.Before_LM_PM := False;
603 -- Otherwise we need to read some characters
606 -- If we are at the end of file now, it means we are trying to
607 -- skip a file terminator and we raise End_Error (RM A.10.7(20))
609 if Nextc (File) = EOF then
613 -- Loop through characters in string
616 -- Exit the loop if read is terminated by encountering line mark
617 -- Note that the use of Skip_Line here ensures we properly deal
618 -- with setting the page and line numbers.
620 if End_Of_Line (File) then
625 -- Otherwise store the character, note that we know that ch is
626 -- something other than LM or EOF. It could possibly be a page
627 -- mark if there is a stray page mark in the middle of a line,
628 -- but this is not an official page mark in any case, since
629 -- official page marks can only follow a line mark. The whole
630 -- page business is pretty much nonsense anyway, so we do not
631 -- want to waste time trying to make sense out of non-standard
632 -- page marks in the file! This means that the behavior of
633 -- Get_Line is different from repeated Get of a character, but
634 -- that's too bad. We only promise that page numbers etc make
635 -- sense if the file is formatted in a standard manner.
637 -- Note: we do not adjust the column number because it is quicker
638 -- to adjust it once at the end of the operation than incrementing
639 -- it each time around the loop.
642 Get (File, Item (Last));
644 -- All done if the string is full, this is the case in which
645 -- we do not skip the following line mark. We need to adjust
646 -- the column number in this case.
648 if Last = Item'Last then
649 File.Col := File.Col + Count (Item'Length);
653 -- Exit from the loop if we are at the end of file. This happens
654 -- if we have a last line that is not terminated with a line mark.
655 -- In this case we consider that there is an implied line mark;
656 -- this is a non-standard file, but we will treat it nicely.
658 exit when Nextc (File) = EOF;
664 (Item : out Wide_String;
668 Get_Line (Current_In, Item, Last);
671 function Get_Line (File : File_Type) return Wide_String is
672 Buffer : Wide_String (1 .. 500);
675 function Get_Rest (S : Wide_String) return Wide_String;
676 -- This is a recursive function that reads the rest of the line and
677 -- returns it. S is the part read so far.
683 function Get_Rest (S : Wide_String) return Wide_String is
685 -- Each time we allocate a buffer the same size as what we have
686 -- read so far. This limits us to a logarithmic number of calls
687 -- to Get_Rest and also ensures only a linear use of stack space.
689 Buffer : Wide_String (1 .. S'Length);
693 Get_Line (File, Buffer, Last);
696 R : constant Wide_String := S & Buffer (1 .. Last);
698 if Last < Buffer'Last then
706 -- Start of processing for Get_Line
709 Get_Line (File, Buffer, Last);
711 if Last < Buffer'Last then
712 return Buffer (1 .. Last);
714 return Get_Rest (Buffer (1 .. Last));
718 function Get_Line return Wide_String is
720 return Get_Line (Current_In);
727 function Get_Wide_Char
729 File : File_Type) return Wide_Character
731 function In_Char return Character;
732 -- Function used to obtain additional characters it the wide character
733 -- sequence is more than one character long.
735 function WC_In is new Char_Sequence_To_Wide_Char (In_Char);
741 function In_Char return Character is
742 ch : constant Integer := Getc (File);
747 return Character'Val (ch);
751 -- Start of processing for In_Char
754 return WC_In (C, File.WC_Method);
757 -------------------------
758 -- Get_Wide_Char_Immed --
759 -------------------------
761 function Get_Wide_Char_Immed
763 File : File_Type) return Wide_Character
765 function In_Char return Character;
766 -- Function used to obtain additional characters it the wide character
767 -- sequence is more than one character long.
769 function WC_In is new Char_Sequence_To_Wide_Char (In_Char);
775 function In_Char return Character is
776 ch : constant Integer := Getc_Immed (File);
781 return Character'Val (ch);
785 -- Start of processing for Get_Wide_Char_Immed
788 return WC_In (C, File.WC_Method);
789 end Get_Wide_Char_Immed;
795 function Getc (File : File_Type) return int is
799 ch := fgetc (File.Stream);
801 if ch = EOF and then ferror (File.Stream) /= 0 then
812 function Getc_Immed (File : File_Type) return int is
816 procedure getc_immediate
817 (stream : FILEs; ch : out int; end_of_file : out int);
818 pragma Import (C, getc_immediate, "getc_immediate");
821 FIO.Check_Read_Status (AP (File));
823 if File.Before_LM then
824 File.Before_LM := False;
825 File.Before_LM_PM := False;
829 getc_immediate (File.Stream, ch, end_of_file);
831 if ferror (File.Stream) /= 0 then
833 elsif end_of_file /= 0 then
845 function Is_Open (File : File_Type) return Boolean is
847 return FIO.Is_Open (AP (File));
854 -- Note: we assume that it is impossible in practice for the line
855 -- to exceed the value of Count'Last, i.e. no check is required for
856 -- overflow raising layout error.
858 function Line (File : File_Type) return Positive_Count is
860 FIO.Check_File_Open (AP (File));
864 function Line return Positive_Count is
866 return Line (Current_Out);
873 function Line_Length (File : File_Type) return Count is
875 FIO.Check_Write_Status (AP (File));
876 return File.Line_Length;
879 function Line_Length return Count is
881 return Line_Length (Current_Out);
890 Item : out Wide_Character;
891 End_Of_Line : out Boolean)
895 -- Start of processing for Look_Ahead
898 FIO.Check_Read_Status (AP (File));
900 -- If we are logically before a line mark, we can return immediately
902 if File.Before_LM then
904 Item := Wide_Character'Val (0);
906 -- If we are before a wide character, just return it (this happens
907 -- if there are two calls to Look_Ahead in a row).
909 elsif File.Before_Wide_Character then
910 End_Of_Line := False;
911 Item := File.Saved_Wide_Character;
913 -- otherwise we must read a character from the input stream
920 or else (ch = EOF and then File.Is_Regular_File)
924 Item := Wide_Character'Val (0);
926 -- If the character is in the range 16#0000# to 16#007F# it stands
927 -- for itself and occupies a single byte, so we can unget it with
930 elsif ch <= 16#0080# then
931 End_Of_Line := False;
933 Item := Wide_Character'Val (ch);
935 -- For a character above this range, we read the character, using
936 -- the Get_Wide_Char routine. It may well occupy more than one byte
937 -- so we can't put it back with ungetc. Instead we save it in the
938 -- control block, setting a flag that everyone interested in reading
939 -- characters must test before reading the stream.
942 Item := Get_Wide_Char (Character'Val (ch), File);
943 End_Of_Line := False;
944 File.Saved_Wide_Character := Item;
945 File.Before_Wide_Character := True;
951 (Item : out Wide_Character;
952 End_Of_Line : out Boolean)
955 Look_Ahead (Current_In, Item, End_Of_Line);
962 function Mode (File : File_Type) return File_Mode is
964 return To_TIO (FIO.Mode (AP (File)));
971 function Name (File : File_Type) return String is
973 return FIO.Name (AP (File));
982 Spacing : Positive_Count := 1)
985 -- Raise Constraint_Error if out of range value. The reason for this
986 -- explicit test is that we don't want junk values around, even if
987 -- checks are off in the caller.
989 if not Spacing'Valid then
990 raise Constraint_Error;
993 FIO.Check_Write_Status (AP (File));
995 for K in 1 .. Spacing loop
997 File.Line := File.Line + 1;
999 if File.Page_Length /= 0
1000 and then File.Line > File.Page_Length
1004 File.Page := File.Page + 1;
1011 procedure New_Line (Spacing : Positive_Count := 1) is
1013 New_Line (Current_Out, Spacing);
1020 procedure New_Page (File : File_Type) is
1022 FIO.Check_Write_Status (AP (File));
1024 if File.Col /= 1 or else File.Line = 1 then
1029 File.Page := File.Page + 1;
1034 procedure New_Page is
1036 New_Page (Current_Out);
1043 function Nextc (File : File_Type) return int is
1047 ch := fgetc (File.Stream);
1050 if ferror (File.Stream) /= 0 then
1055 if ungetc (ch, File.Stream) = EOF then
1068 (File : in out File_Type;
1071 Form : String := "")
1073 Dummy_File_Control_Block : Wide_Text_AFCB;
1074 pragma Warnings (Off, Dummy_File_Control_Block);
1075 -- Yes, we know this is never assigned a value, only the tag
1076 -- is used for dispatching purposes, so that's expected.
1079 FIO.Open (File_Ptr => AP (File),
1080 Dummy_FCB => Dummy_File_Control_Block,
1081 Mode => To_FCB (Mode),
1094 -- Note: we assume that it is impossible in practice for the page
1095 -- to exceed the value of Count'Last, i.e. no check is required for
1096 -- overflow raising layout error.
1098 function Page (File : File_Type) return Positive_Count is
1100 FIO.Check_File_Open (AP (File));
1104 function Page return Positive_Count is
1106 return Page (Current_Out);
1113 function Page_Length (File : File_Type) return Count is
1115 FIO.Check_Write_Status (AP (File));
1116 return File.Page_Length;
1119 function Page_Length return Count is
1121 return Page_Length (Current_Out);
1130 Item : Wide_Character)
1132 procedure Out_Char (C : Character);
1133 -- Procedure to output one character of a wide character sequence
1135 procedure WC_Out is new Wide_Char_To_Char_Sequence (Out_Char);
1140 procedure Out_Char (C : Character) is
1142 Putc (Character'Pos (C), File);
1145 -- Start of processing for Put
1148 WC_Out (Item, File.WC_Method);
1149 File.Col := File.Col + 1;
1152 procedure Put (Item : Wide_Character) is
1154 Put (Current_Out, Item);
1166 for J in Item'Range loop
1167 Put (File, Item (J));
1171 procedure Put (Item : Wide_String) is
1173 Put (Current_Out, Item);
1189 procedure Put_Line (Item : Wide_String) is
1191 Put (Current_Out, Item);
1192 New_Line (Current_Out);
1199 procedure Putc (ch : int; File : File_Type) is
1201 if fputc (ch, File.Stream) = EOF then
1210 -- This is the primitive Stream Read routine, used when a Text_IO file
1211 -- is treated directly as a stream using Text_IO.Streams.Stream.
1214 (File : in out Wide_Text_AFCB;
1215 Item : out Stream_Element_Array;
1216 Last : out Stream_Element_Offset)
1219 pragma Unreferenced (Discard_ch);
1222 -- Need to deal with Before_Wide_Character ???
1224 if File.Mode /= FCB.In_File then
1228 -- Deal with case where our logical and physical position do not match
1229 -- because of being after an LM or LM-PM sequence when in fact we are
1230 -- logically positioned before it.
1232 if File.Before_LM then
1234 -- If we are before a PM, then it is possible for a stream read
1235 -- to leave us after the LM and before the PM, which is a bit
1236 -- odd. The easiest way to deal with this is to unget the PM,
1237 -- so we are indeed positioned between the characters. This way
1238 -- further stream read operations will work correctly, and the
1239 -- effect on text processing is a little weird, but what can
1240 -- be expected if stream and text input are mixed this way?
1242 if File.Before_LM_PM then
1243 Discard_ch := ungetc (PM, File.Stream);
1244 File.Before_LM_PM := False;
1247 File.Before_LM := False;
1249 Item (Item'First) := Stream_Element (Character'Pos (ASCII.LF));
1251 if Item'Length = 1 then
1257 Stream_Element_Offset
1258 (fread (buffer => Item'Address,
1259 index => size_t (Item'First + 1),
1261 count => Item'Length - 1,
1262 stream => File.Stream));
1268 -- Now we do the read. Since this is a text file, it is normally in
1269 -- text mode, but stream data must be read in binary mode, so we
1270 -- temporarily set binary mode for the read, resetting it after.
1271 -- These calls have no effect in a system (like Unix) where there is
1272 -- no distinction between text and binary files.
1274 set_binary_mode (fileno (File.Stream));
1278 Stream_Element_Offset
1279 (fread (Item'Address, 1, Item'Length, File.Stream)) - 1;
1281 if Last < Item'Last then
1282 if ferror (File.Stream) /= 0 then
1287 set_text_mode (fileno (File.Stream));
1295 (File : in out File_Type;
1299 -- Don't allow change of mode for current file (RM A.10.2(5))
1301 if (File = Current_In or else
1302 File = Current_Out or else
1303 File = Current_Error)
1304 and then To_FCB (Mode) /= File.Mode
1309 Terminate_Line (File);
1310 FIO.Reset (AP (File), To_FCB (Mode));
1314 File.Line_Length := 0;
1315 File.Page_Length := 0;
1316 File.Before_LM := False;
1317 File.Before_LM_PM := False;
1320 procedure Reset (File : in out File_Type) is
1322 Terminate_Line (File);
1323 FIO.Reset (AP (File));
1327 File.Line_Length := 0;
1328 File.Page_Length := 0;
1329 File.Before_LM := False;
1330 File.Before_LM_PM := False;
1339 To : Positive_Count)
1344 -- Raise Constraint_Error if out of range value. The reason for this
1345 -- explicit test is that we don't want junk values around, even if
1346 -- checks are off in the caller.
1348 if not To'Valid then
1349 raise Constraint_Error;
1352 FIO.Check_File_Open (AP (File));
1354 if To = File.Col then
1358 if Mode (File) >= Out_File then
1359 if File.Line_Length /= 0 and then To > File.Line_Length then
1363 if To < File.Col then
1367 while File.Col < To loop
1379 File.Line := File.Line + 1;
1382 elsif ch = PM and then File.Is_Regular_File then
1383 File.Page := File.Page + 1;
1387 elsif To = File.Col then
1392 File.Col := File.Col + 1;
1398 procedure Set_Col (To : Positive_Count) is
1400 Set_Col (Current_Out, To);
1407 procedure Set_Error (File : File_Type) is
1409 FIO.Check_Write_Status (AP (File));
1410 Current_Err := File;
1417 procedure Set_Input (File : File_Type) is
1419 FIO.Check_Read_Status (AP (File));
1429 To : Positive_Count)
1432 -- Raise Constraint_Error if out of range value. The reason for this
1433 -- explicit test is that we don't want junk values around, even if
1434 -- checks are off in the caller.
1436 if not To'Valid then
1437 raise Constraint_Error;
1440 FIO.Check_File_Open (AP (File));
1442 if To = File.Line then
1446 if Mode (File) >= Out_File then
1447 if File.Page_Length /= 0 and then To > File.Page_Length then
1451 if To < File.Line then
1455 while File.Line < To loop
1460 while To /= File.Line loop
1466 procedure Set_Line (To : Positive_Count) is
1468 Set_Line (Current_Out, To);
1471 ---------------------
1472 -- Set_Line_Length --
1473 ---------------------
1475 procedure Set_Line_Length (File : File_Type; To : Count) is
1477 -- Raise Constraint_Error if out of range value. The reason for this
1478 -- explicit test is that we don't want junk values around, even if
1479 -- checks are off in the caller.
1481 if not To'Valid then
1482 raise Constraint_Error;
1485 FIO.Check_Write_Status (AP (File));
1486 File.Line_Length := To;
1487 end Set_Line_Length;
1489 procedure Set_Line_Length (To : Count) is
1491 Set_Line_Length (Current_Out, To);
1492 end Set_Line_Length;
1498 procedure Set_Output (File : File_Type) is
1500 FIO.Check_Write_Status (AP (File));
1501 Current_Out := File;
1504 ---------------------
1505 -- Set_Page_Length --
1506 ---------------------
1508 procedure Set_Page_Length (File : File_Type; To : Count) is
1510 -- Raise Constraint_Error if out of range value. The reason for this
1511 -- explicit test is that we don't want junk values around, even if
1512 -- checks are off in the caller.
1514 if not To'Valid then
1515 raise Constraint_Error;
1518 FIO.Check_Write_Status (AP (File));
1519 File.Page_Length := To;
1520 end Set_Page_Length;
1522 procedure Set_Page_Length (To : Count) is
1524 Set_Page_Length (Current_Out, To);
1525 end Set_Page_Length;
1531 procedure Set_WCEM (File : in out File_Type) is
1536 File.WC_Method := WCEM_Brackets;
1537 FIO.Form_Parameter (File.Form.all, "wcem", Start, Stop);
1540 File.WC_Method := WCEM_Brackets;
1542 elsif Start /= 0 then
1543 if Stop = Start then
1544 for J in WC_Encoding_Letters'Range loop
1545 if File.Form (Start) = WC_Encoding_Letters (J) then
1546 File.WC_Method := J;
1553 Raise_Exception (Use_Error'Identity, "invalid WCEM form parameter");
1563 Spacing : Positive_Count := 1)
1568 -- Raise Constraint_Error if out of range value. The reason for this
1569 -- explicit test is that we don't want junk values around, even if
1570 -- checks are off in the caller.
1572 if not Spacing'Valid then
1573 raise Constraint_Error;
1576 FIO.Check_Read_Status (AP (File));
1578 for L in 1 .. Spacing loop
1579 if File.Before_LM then
1580 File.Before_LM := False;
1581 File.Before_LM_PM := False;
1586 -- If at end of file now, then immediately raise End_Error. Note
1587 -- that we can never be positioned between a line mark and a page
1588 -- mark, so if we are at the end of file, we cannot logically be
1589 -- before the implicit page mark that is at the end of the file.
1591 -- For the same reason, we do not need an explicit check for a
1592 -- page mark. If there is a FF in the middle of a line, the file
1593 -- is not in canonical format and we do not care about the page
1594 -- numbers for files other than ones in canonical format.
1600 -- If not at end of file, then loop till we get to an LM or EOF.
1601 -- The latter case happens only in non-canonical files where the
1602 -- last line is not terminated by LM, but we don't want to blow
1603 -- up for such files, so we assume an implicit LM in this case.
1606 exit when ch = LM or ch = EOF;
1611 -- We have got past a line mark, now, for a regular file only,
1612 -- see if a page mark immediately follows this line mark and
1613 -- if so, skip past the page mark as well. We do not do this
1614 -- for non-regular files, since it would cause an undesirable
1615 -- wait for an additional character.
1618 File.Line := File.Line + 1;
1620 if File.Before_LM_PM then
1621 File.Page := File.Page + 1;
1623 File.Before_LM_PM := False;
1625 elsif File.Is_Regular_File then
1628 -- Page mark can be explicit, or implied at the end of the file
1630 if (ch = PM or else ch = EOF)
1631 and then File.Is_Regular_File
1633 File.Page := File.Page + 1;
1642 File.Before_Wide_Character := False;
1645 procedure Skip_Line (Spacing : Positive_Count := 1) is
1647 Skip_Line (Current_In, Spacing);
1654 procedure Skip_Page (File : File_Type) is
1658 FIO.Check_Read_Status (AP (File));
1660 -- If at page mark already, just skip it
1662 if File.Before_LM_PM then
1663 File.Before_LM := False;
1664 File.Before_LM_PM := False;
1665 File.Page := File.Page + 1;
1671 -- This is a bit tricky, if we are logically before an LM then
1672 -- it is not an error if we are at an end of file now, since we
1673 -- are not really at it.
1675 if File.Before_LM then
1676 File.Before_LM := False;
1677 File.Before_LM_PM := False;
1680 -- Otherwise we do raise End_Error if we are at the end of file now
1690 -- Now we can just rumble along to the next page mark, or to the
1691 -- end of file, if that comes first. The latter case happens when
1692 -- the page mark is implied at the end of file.
1696 or else (ch = PM and then File.Is_Regular_File);
1700 File.Page := File.Page + 1;
1703 File.Before_Wide_Character := False;
1706 procedure Skip_Page is
1708 Skip_Page (Current_In);
1711 --------------------
1712 -- Standard_Error --
1713 --------------------
1715 function Standard_Error return File_Type is
1717 return Standard_Err;
1720 function Standard_Error return File_Access is
1722 return Standard_Err'Access;
1725 --------------------
1726 -- Standard_Input --
1727 --------------------
1729 function Standard_Input return File_Type is
1734 function Standard_Input return File_Access is
1736 return Standard_In'Access;
1739 ---------------------
1740 -- Standard_Output --
1741 ---------------------
1743 function Standard_Output return File_Type is
1745 return Standard_Out;
1746 end Standard_Output;
1748 function Standard_Output return File_Access is
1750 return Standard_Out'Access;
1751 end Standard_Output;
1753 --------------------
1754 -- Terminate_Line --
1755 --------------------
1757 procedure Terminate_Line (File : File_Type) is
1759 FIO.Check_File_Open (AP (File));
1761 -- For file other than In_File, test for needing to terminate last line
1763 if Mode (File) /= In_File then
1765 -- If not at start of line definition need new line
1767 if File.Col /= 1 then
1770 -- For files other than standard error and standard output, we
1771 -- make sure that an empty file has a single line feed, so that
1772 -- it is properly formatted. We avoid this for the standard files
1773 -- because it is too much of a nuisance to have these odd line
1774 -- feeds when nothing has been written to the file.
1776 elsif (File /= Standard_Err and then File /= Standard_Out)
1777 and then (File.Line = 1 and then File.Page = 1)
1788 procedure Ungetc (ch : int; File : File_Type) is
1791 if ungetc (ch, File.Stream) = EOF then
1801 -- This is the primitive Stream Write routine, used when a Text_IO file
1802 -- is treated directly as a stream using Text_IO.Streams.Stream.
1805 (File : in out Wide_Text_AFCB;
1806 Item : Stream_Element_Array)
1808 Siz : constant size_t := Item'Length;
1811 if File.Mode = FCB.In_File then
1815 -- Now we do the write. Since this is a text file, it is normally in
1816 -- text mode, but stream data must be written in binary mode, so we
1817 -- temporarily set binary mode for the write, resetting it after.
1818 -- These calls have no effect in a system (like Unix) where there is
1819 -- no distinction between text and binary files.
1821 set_binary_mode (fileno (File.Stream));
1823 if fwrite (Item'Address, 1, Siz, File.Stream) /= Siz then
1827 set_text_mode (fileno (File.Stream));
1830 -- Use "preallocated" strings to avoid calling "new" during the
1831 -- elaboration of the run time. This is needed in the tasking case to
1832 -- avoid calling Task_Lock too early. A filename is expected to end with
1833 -- a null character in the runtime, here the null characters are added
1834 -- just to have a correct filename length.
1836 Err_Name : aliased String := "*stderr" & ASCII.Nul;
1837 In_Name : aliased String := "*stdin" & ASCII.Nul;
1838 Out_Name : aliased String := "*stdout" & ASCII.Nul;
1841 -------------------------------
1842 -- Initialize Standard Files --
1843 -------------------------------
1845 for J in WC_Encoding_Method loop
1846 if WC_Encoding = WC_Encoding_Letters (J) then
1851 -- Note: the names in these files are bogus, and probably it would be
1852 -- better for these files to have no names, but the ACVC test insist!
1853 -- We use names that are bound to fail in open etc.
1855 Standard_Err.Stream := stderr;
1856 Standard_Err.Name := Err_Name'Access;
1857 Standard_Err.Form := Null_Str'Unrestricted_Access;
1858 Standard_Err.Mode := FCB.Out_File;
1859 Standard_Err.Is_Regular_File := is_regular_file (fileno (stderr)) /= 0;
1860 Standard_Err.Is_Temporary_File := False;
1861 Standard_Err.Is_System_File := True;
1862 Standard_Err.Is_Text_File := True;
1863 Standard_Err.Access_Method := 'T';
1864 Standard_Err.WC_Method := Default_WCEM;
1866 Standard_In.Stream := stdin;
1867 Standard_In.Name := In_Name'Access;
1868 Standard_In.Form := Null_Str'Unrestricted_Access;
1869 Standard_In.Mode := FCB.In_File;
1870 Standard_In.Is_Regular_File := is_regular_file (fileno (stdin)) /= 0;
1871 Standard_In.Is_Temporary_File := False;
1872 Standard_In.Is_System_File := True;
1873 Standard_In.Is_Text_File := True;
1874 Standard_In.Access_Method := 'T';
1875 Standard_In.WC_Method := Default_WCEM;
1877 Standard_Out.Stream := stdout;
1878 Standard_Out.Name := Out_Name'Access;
1879 Standard_Out.Form := Null_Str'Unrestricted_Access;
1880 Standard_Out.Mode := FCB.Out_File;
1881 Standard_Out.Is_Regular_File := is_regular_file (fileno (stdout)) /= 0;
1882 Standard_Out.Is_Temporary_File := False;
1883 Standard_Out.Is_System_File := True;
1884 Standard_Out.Is_Text_File := True;
1885 Standard_Out.Access_Method := 'T';
1886 Standard_Out.WC_Method := Default_WCEM;
1888 FIO.Chain_File (AP (Standard_In));
1889 FIO.Chain_File (AP (Standard_Out));
1890 FIO.Chain_File (AP (Standard_Err));
1892 FIO.Make_Unbuffered (AP (Standard_Out));
1893 FIO.Make_Unbuffered (AP (Standard_Err));
1895 end Ada.Wide_Text_IO;