1 ------------------------------------------------------------------------------
3 -- GNAT RUNTIME COMPONENTS --
5 -- A D A . W I D E _ T E X T _ I O --
9 -- Copyright (C) 1992-2003 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, 59 Temple Place - Suite 330, Boston, --
20 -- MA 02111-1307, 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;
41 with System.WCh_Cnv; use System.WCh_Cnv;
42 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 : in 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
75 return Wide_Character;
76 -- This routine is identical to Get_Wide_Char, except that the reads are
77 -- done in Get_Immediate mode (i.e. without waiting for a line return).
79 procedure Set_WCEM (File : in out File_Type);
80 -- Called by Open and Create to set the wide character encoding method
81 -- for the file, processing a WCEM form parameter if one is present.
82 -- File is IN OUT because it may be closed in case of an error.
88 function AFCB_Allocate
89 (Control_Block : Wide_Text_AFCB)
92 pragma Unreferenced (Control_Block);
95 return new Wide_Text_AFCB;
102 procedure AFCB_Close (File : access Wide_Text_AFCB) is
104 -- If the file being closed is one of the current files, then close
105 -- the corresponding current file. It is not clear that this action
106 -- is required (RM A.10.3(23)) but it seems reasonable, and besides
107 -- ACVC test CE3208A expects this behavior.
109 if File_Type (File) = Current_In then
111 elsif File_Type (File) = Current_Out then
113 elsif File_Type (File) = Current_Err then
117 Terminate_Line (File_Type (File));
124 procedure AFCB_Free (File : access Wide_Text_AFCB) is
125 type FCB_Ptr is access all Wide_Text_AFCB;
126 FT : FCB_Ptr := FCB_Ptr (File);
128 procedure Free is new Unchecked_Deallocation (Wide_Text_AFCB, FCB_Ptr);
138 procedure Close (File : in out File_Type) is
140 FIO.Close (AP (File));
147 -- Note: we assume that it is impossible in practice for the column
148 -- to exceed the value of Count'Last, i.e. no check is required for
149 -- overflow raising layout error.
151 function Col (File : in File_Type) return Positive_Count is
153 FIO.Check_File_Open (AP (File));
157 function Col return Positive_Count is
159 return Col (Current_Out);
167 (File : in out File_Type;
168 Mode : in File_Mode := Out_File;
169 Name : in String := "";
170 Form : in String := "")
172 Dummy_File_Control_Block : Wide_Text_AFCB;
173 pragma Warnings (Off, Dummy_File_Control_Block);
174 -- Yes, we know this is never assigned a value, only the tag
175 -- is used for dispatching purposes, so that's expected.
178 FIO.Open (File_Ptr => AP (File),
179 Dummy_FCB => Dummy_File_Control_Block,
180 Mode => To_FCB (Mode),
193 function Current_Error return File_Type is
198 function Current_Error return File_Access is
200 return Current_Err'Access;
207 function Current_Input return File_Type is
212 function Current_Input return File_Access is
214 return Current_In'Access;
221 function Current_Output return File_Type is
226 function Current_Output return File_Access is
228 return Current_Out'Access;
235 procedure Delete (File : in out File_Type) is
237 FIO.Delete (AP (File));
244 function End_Of_File (File : in File_Type) return Boolean is
248 FIO.Check_Read_Status (AP (File));
250 if File.Before_Wide_Character then
253 elsif File.Before_LM then
255 if File.Before_LM_PM then
256 return Nextc (File) = EOF;
270 File.Before_LM := True;
274 -- Here we are just past the line mark with Before_LM set so that we
275 -- do not have to try to back up past the LM, thus avoiding the need
276 -- to back up more than one character.
283 elsif ch = PM and then File.Is_Regular_File then
284 File.Before_LM_PM := True;
285 return Nextc (File) = EOF;
287 -- Here if neither EOF nor PM followed end of line
296 function End_Of_File return Boolean is
298 return End_Of_File (Current_In);
305 function End_Of_Line (File : in File_Type) return Boolean is
309 FIO.Check_Read_Status (AP (File));
311 if File.Before_Wide_Character then
314 elsif File.Before_LM then
330 function End_Of_Line return Boolean is
332 return End_Of_Line (Current_In);
339 function End_Of_Page (File : in File_Type) return Boolean is
343 FIO.Check_Read_Status (AP (File));
345 if not File.Is_Regular_File then
348 elsif File.Before_Wide_Character then
351 elsif File.Before_LM then
352 if File.Before_LM_PM then
367 File.Before_LM := True;
371 -- Here we are just past the line mark with Before_LM set so that we
372 -- do not have to try to back up past the LM, thus avoiding the need
373 -- to back up more than one character.
377 return ch = PM or else ch = EOF;
380 function End_Of_Page return Boolean is
382 return End_Of_Page (Current_In);
389 procedure Flush (File : in File_Type) is
391 FIO.Flush (AP (File));
403 function Form (File : in File_Type) return String is
405 return FIO.Form (AP (File));
413 (File : in File_Type;
414 Item : out Wide_Character)
419 FIO.Check_Read_Status (AP (File));
421 if File.Before_Wide_Character then
422 File.Before_Wide_Character := False;
423 Item := File.Saved_Wide_Character;
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);
437 (File : in File_Type;
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
456 (File : in File_Type;
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
504 (File : in File_Type;
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
540 (File : in File_Type;
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 ch := Getc_Immed (File);
565 Item := Get_Wide_Char_Immed (Character'Val (ch), File);
570 procedure Get_Immediate
571 (Item : out Wide_Character;
572 Available : out Boolean)
575 Get_Immediate (Current_In, Item, Available);
583 (File : in File_Type;
584 Item : out Wide_String;
588 FIO.Check_Read_Status (AP (File));
589 Last := Item'First - 1;
591 -- Immediate exit for null string, this is a case in which we do not
592 -- need to test for end of file and we do not skip a line mark under
593 -- any circumstances.
595 if Last >= Item'Last then
599 -- Here we have at least one character, if we are immediately before
600 -- a line mark, then we will just skip past it storing no characters.
602 if File.Before_LM then
603 File.Before_LM := False;
604 File.Before_LM_PM := False;
606 -- Otherwise we need to read some characters
609 -- If we are at the end of file now, it means we are trying to
610 -- skip a file terminator and we raise End_Error (RM A.10.7(20))
612 if Nextc (File) = EOF then
616 -- Loop through characters in string
619 -- Exit the loop if read is terminated by encountering line mark
620 -- Note that the use of Skip_Line here ensures we properly deal
621 -- with setting the page and line numbers.
623 if End_Of_Line (File) then
628 -- Otherwise store the character, note that we know that ch is
629 -- something other than LM or EOF. It could possibly be a page
630 -- mark if there is a stray page mark in the middle of a line,
631 -- but this is not an official page mark in any case, since
632 -- official page marks can only follow a line mark. The whole
633 -- page business is pretty much nonsense anyway, so we do not
634 -- want to waste time trying to make sense out of non-standard
635 -- page marks in the file! This means that the behavior of
636 -- Get_Line is different from repeated Get of a character, but
637 -- that's too bad. We only promise that page numbers etc make
638 -- sense if the file is formatted in a standard manner.
640 -- Note: we do not adjust the column number because it is quicker
641 -- to adjust it once at the end of the operation than incrementing
642 -- it each time around the loop.
645 Get (File, Item (Last));
647 -- All done if the string is full, this is the case in which
648 -- we do not skip the following line mark. We need to adjust
649 -- the column number in this case.
651 if Last = Item'Last then
652 File.Col := File.Col + Count (Item'Length);
656 -- Exit from the loop if we are at the end of file. This happens
657 -- if we have a last line that is not terminated with a line mark.
658 -- In this case we consider that there is an implied line mark;
659 -- this is a non-standard file, but we will treat it nicely.
661 exit when Nextc (File) = EOF;
667 (Item : out Wide_String;
671 Get_Line (Current_In, Item, Last);
678 function Get_Wide_Char
681 return Wide_Character
683 function In_Char return Character;
684 -- Function used to obtain additional characters it the wide character
685 -- sequence is more than one character long.
687 function In_Char return Character is
688 ch : constant Integer := Getc (File);
694 return Character'Val (ch);
698 function WC_In is new Char_Sequence_To_Wide_Char (In_Char);
701 return WC_In (C, File.WC_Method);
704 -------------------------
705 -- Get_Wide_Char_Immed --
706 -------------------------
708 function Get_Wide_Char_Immed
711 return Wide_Character
713 function In_Char return Character;
714 -- Function used to obtain additional characters it the wide character
715 -- sequence is more than one character long.
717 function In_Char return Character is
718 ch : constant Integer := Getc_Immed (File);
724 return Character'Val (ch);
728 function WC_In is new Char_Sequence_To_Wide_Char (In_Char);
731 return WC_In (C, File.WC_Method);
732 end Get_Wide_Char_Immed;
738 function Getc (File : File_Type) return int is
742 ch := fgetc (File.Stream);
744 if ch = EOF and then ferror (File.Stream) /= 0 then
755 function Getc_Immed (File : in File_Type) return int is
759 procedure getc_immediate
760 (stream : FILEs; ch : out int; end_of_file : out int);
761 pragma Import (C, getc_immediate, "getc_immediate");
764 FIO.Check_Read_Status (AP (File));
766 if File.Before_LM then
767 File.Before_LM := False;
768 File.Before_LM_PM := False;
772 getc_immediate (File.Stream, ch, end_of_file);
774 if ferror (File.Stream) /= 0 then
776 elsif end_of_file /= 0 then
788 function Is_Open (File : in File_Type) return Boolean is
790 return FIO.Is_Open (AP (File));
797 -- Note: we assume that it is impossible in practice for the line
798 -- to exceed the value of Count'Last, i.e. no check is required for
799 -- overflow raising layout error.
801 function Line (File : in File_Type) return Positive_Count is
803 FIO.Check_File_Open (AP (File));
807 function Line return Positive_Count is
809 return Line (Current_Out);
816 function Line_Length (File : in File_Type) return Count is
818 FIO.Check_Write_Status (AP (File));
819 return File.Line_Length;
822 function Line_Length return Count is
824 return Line_Length (Current_Out);
832 (File : in File_Type;
833 Item : out Wide_Character;
834 End_Of_Line : out Boolean)
838 -- Start of processing for Look_Ahead
841 FIO.Check_Read_Status (AP (File));
843 -- If we are logically before a line mark, we can return immediately
845 if File.Before_LM then
847 Item := Wide_Character'Val (0);
849 -- If we are before a wide character, just return it (this happens
850 -- if there are two calls to Look_Ahead in a row).
852 elsif File.Before_Wide_Character then
853 End_Of_Line := False;
854 Item := File.Saved_Wide_Character;
856 -- otherwise we must read a character from the input stream
863 or else (ch = EOF and then File.Is_Regular_File)
867 Item := Wide_Character'Val (0);
869 -- If the character is in the range 16#0000# to 16#007F# it stands
870 -- for itself and occupies a single byte, so we can unget it with
873 elsif ch <= 16#0080# then
874 End_Of_Line := False;
876 Item := Wide_Character'Val (ch);
878 -- For a character above this range, we read the character, using
879 -- the Get_Wide_Char routine. It may well occupy more than one byte
880 -- so we can't put it back with ungetc. Instead we save it in the
881 -- control block, setting a flag that everyone interested in reading
882 -- characters must test before reading the stream.
885 Item := Get_Wide_Char (Character'Val (ch), File);
886 End_Of_Line := False;
887 File.Saved_Wide_Character := Item;
888 File.Before_Wide_Character := True;
894 (Item : out Wide_Character;
895 End_Of_Line : out Boolean)
898 Look_Ahead (Current_In, Item, End_Of_Line);
905 function Mode (File : in File_Type) return File_Mode is
907 return To_TIO (FIO.Mode (AP (File)));
914 function Name (File : in File_Type) return String is
916 return FIO.Name (AP (File));
924 (File : in File_Type;
925 Spacing : in Positive_Count := 1)
928 -- Raise Constraint_Error if out of range value. The reason for this
929 -- explicit test is that we don't want junk values around, even if
930 -- checks are off in the caller.
932 if Spacing not in Positive_Count then
933 raise Constraint_Error;
936 FIO.Check_Write_Status (AP (File));
938 for K in 1 .. Spacing loop
940 File.Line := File.Line + 1;
942 if File.Page_Length /= 0
943 and then File.Line > File.Page_Length
947 File.Page := File.Page + 1;
954 procedure New_Line (Spacing : in Positive_Count := 1) is
956 New_Line (Current_Out, Spacing);
963 procedure New_Page (File : in File_Type) is
965 FIO.Check_Write_Status (AP (File));
967 if File.Col /= 1 or else File.Line = 1 then
972 File.Page := File.Page + 1;
977 procedure New_Page is
979 New_Page (Current_Out);
986 function Nextc (File : File_Type) return int is
990 ch := fgetc (File.Stream);
993 if ferror (File.Stream) /= 0 then
998 if ungetc (ch, File.Stream) = EOF then
1011 (File : in out File_Type;
1012 Mode : in File_Mode;
1014 Form : in String := "")
1016 Dummy_File_Control_Block : Wide_Text_AFCB;
1017 pragma Warnings (Off, Dummy_File_Control_Block);
1018 -- Yes, we know this is never assigned a value, only the tag
1019 -- is used for dispatching purposes, so that's expected.
1022 FIO.Open (File_Ptr => AP (File),
1023 Dummy_FCB => Dummy_File_Control_Block,
1024 Mode => To_FCB (Mode),
1037 -- Note: we assume that it is impossible in practice for the page
1038 -- to exceed the value of Count'Last, i.e. no check is required for
1039 -- overflow raising layout error.
1041 function Page (File : in File_Type) return Positive_Count is
1043 FIO.Check_File_Open (AP (File));
1047 function Page return Positive_Count is
1049 return Page (Current_Out);
1056 function Page_Length (File : in File_Type) return Count is
1058 FIO.Check_Write_Status (AP (File));
1059 return File.Page_Length;
1062 function Page_Length return Count is
1064 return Page_Length (Current_Out);
1072 (File : in File_Type;
1073 Item : in Wide_Character)
1075 procedure Out_Char (C : Character);
1076 -- Procedure to output one character of a wide character sequence
1078 procedure Out_Char (C : Character) is
1080 Putc (Character'Pos (C), File);
1083 procedure WC_Out is new Wide_Char_To_Char_Sequence (Out_Char);
1086 WC_Out (Item, File.WC_Method);
1087 File.Col := File.Col + 1;
1090 procedure Put (Item : in Wide_Character) is
1092 Put (Current_Out, Item);
1100 (File : in File_Type;
1101 Item : in Wide_String)
1104 for J in Item'Range loop
1105 Put (File, Item (J));
1109 procedure Put (Item : in Wide_String) is
1111 Put (Current_Out, Item);
1119 (File : in File_Type;
1120 Item : in Wide_String)
1127 procedure Put_Line (Item : in Wide_String) is
1129 Put (Current_Out, Item);
1130 New_Line (Current_Out);
1137 procedure Putc (ch : int; File : File_Type) is
1139 if fputc (ch, File.Stream) = EOF then
1148 -- This is the primitive Stream Read routine, used when a Text_IO file
1149 -- is treated directly as a stream using Text_IO.Streams.Stream.
1152 (File : in out Wide_Text_AFCB;
1153 Item : out Stream_Element_Array;
1154 Last : out Stream_Element_Offset)
1157 pragma Unreferenced (Discard_ch);
1160 -- Need to deal with Before_Wide_Character ???
1162 if File.Mode /= FCB.In_File then
1166 -- Deal with case where our logical and physical position do not match
1167 -- because of being after an LM or LM-PM sequence when in fact we are
1168 -- logically positioned before it.
1170 if File.Before_LM then
1172 -- If we are before a PM, then it is possible for a stream read
1173 -- to leave us after the LM and before the PM, which is a bit
1174 -- odd. The easiest way to deal with this is to unget the PM,
1175 -- so we are indeed positioned between the characters. This way
1176 -- further stream read operations will work correctly, and the
1177 -- effect on text processing is a little weird, but what can
1178 -- be expected if stream and text input are mixed this way?
1180 if File.Before_LM_PM then
1181 Discard_ch := ungetc (PM, File.Stream);
1182 File.Before_LM_PM := False;
1185 File.Before_LM := False;
1187 Item (Item'First) := Stream_Element (Character'Pos (ASCII.LF));
1189 if Item'Length = 1 then
1195 Stream_Element_Offset
1196 (fread (buffer => Item'Address,
1197 index => size_t (Item'First + 1),
1199 count => Item'Length - 1,
1200 stream => File.Stream));
1206 -- Now we do the read. Since this is a text file, it is normally in
1207 -- text mode, but stream data must be read in binary mode, so we
1208 -- temporarily set binary mode for the read, resetting it after.
1209 -- These calls have no effect in a system (like Unix) where there is
1210 -- no distinction between text and binary files.
1212 set_binary_mode (fileno (File.Stream));
1216 Stream_Element_Offset
1217 (fread (Item'Address, 1, Item'Length, File.Stream)) - 1;
1219 if Last < Item'Last then
1220 if ferror (File.Stream) /= 0 then
1225 set_text_mode (fileno (File.Stream));
1233 (File : in out File_Type;
1234 Mode : in File_Mode)
1237 -- Don't allow change of mode for current file (RM A.10.2(5))
1239 if (File = Current_In or else
1240 File = Current_Out or else
1241 File = Current_Error)
1242 and then To_FCB (Mode) /= File.Mode
1247 Terminate_Line (File);
1248 FIO.Reset (AP (File), To_FCB (Mode));
1252 File.Line_Length := 0;
1253 File.Page_Length := 0;
1254 File.Before_LM := False;
1255 File.Before_LM_PM := False;
1258 procedure Reset (File : in out File_Type) is
1260 Terminate_Line (File);
1261 FIO.Reset (AP (File));
1265 File.Line_Length := 0;
1266 File.Page_Length := 0;
1267 File.Before_LM := False;
1268 File.Before_LM_PM := False;
1276 (File : in File_Type;
1277 To : in Positive_Count)
1282 -- Raise Constraint_Error if out of range value. The reason for this
1283 -- explicit test is that we don't want junk values around, even if
1284 -- checks are off in the caller.
1286 if To not in Positive_Count then
1287 raise Constraint_Error;
1290 FIO.Check_File_Open (AP (File));
1292 if To = File.Col then
1296 if Mode (File) >= Out_File then
1297 if File.Line_Length /= 0 and then To > File.Line_Length then
1301 if To < File.Col then
1305 while File.Col < To loop
1317 File.Line := File.Line + 1;
1320 elsif ch = PM and then File.Is_Regular_File then
1321 File.Page := File.Page + 1;
1325 elsif To = File.Col then
1330 File.Col := File.Col + 1;
1336 procedure Set_Col (To : in Positive_Count) is
1338 Set_Col (Current_Out, To);
1345 procedure Set_Error (File : in File_Type) is
1347 FIO.Check_Write_Status (AP (File));
1348 Current_Err := File;
1355 procedure Set_Input (File : in File_Type) is
1357 FIO.Check_Read_Status (AP (File));
1366 (File : in File_Type;
1367 To : in Positive_Count)
1370 -- Raise Constraint_Error if out of range value. The reason for this
1371 -- explicit test is that we don't want junk values around, even if
1372 -- checks are off in the caller.
1374 if To not in Positive_Count then
1375 raise Constraint_Error;
1378 FIO.Check_File_Open (AP (File));
1380 if To = File.Line then
1384 if Mode (File) >= Out_File then
1385 if File.Page_Length /= 0 and then To > File.Page_Length then
1389 if To < File.Line then
1393 while File.Line < To loop
1398 while To /= File.Line loop
1404 procedure Set_Line (To : in Positive_Count) is
1406 Set_Line (Current_Out, To);
1409 ---------------------
1410 -- Set_Line_Length --
1411 ---------------------
1413 procedure Set_Line_Length (File : in File_Type; To : in Count) is
1415 -- Raise Constraint_Error if out of range value. The reason for this
1416 -- explicit test is that we don't want junk values around, even if
1417 -- checks are off in the caller.
1419 if To not in Count then
1420 raise Constraint_Error;
1423 FIO.Check_Write_Status (AP (File));
1424 File.Line_Length := To;
1425 end Set_Line_Length;
1427 procedure Set_Line_Length (To : in Count) is
1429 Set_Line_Length (Current_Out, To);
1430 end Set_Line_Length;
1436 procedure Set_Output (File : in File_Type) is
1438 FIO.Check_Write_Status (AP (File));
1439 Current_Out := File;
1442 ---------------------
1443 -- Set_Page_Length --
1444 ---------------------
1446 procedure Set_Page_Length (File : in File_Type; To : in Count) is
1448 -- Raise Constraint_Error if out of range value. The reason for this
1449 -- explicit test is that we don't want junk values around, even if
1450 -- checks are off in the caller.
1452 if To not in Count then
1453 raise Constraint_Error;
1456 FIO.Check_Write_Status (AP (File));
1457 File.Page_Length := To;
1458 end Set_Page_Length;
1460 procedure Set_Page_Length (To : in Count) is
1462 Set_Page_Length (Current_Out, To);
1463 end Set_Page_Length;
1469 procedure Set_WCEM (File : in out File_Type) is
1474 File.WC_Method := WCEM_Brackets;
1475 FIO.Form_Parameter (File.Form.all, "wcem", Start, Stop);
1478 File.WC_Method := WCEM_Brackets;
1480 elsif Start /= 0 then
1481 if Stop = Start then
1482 for J in WC_Encoding_Letters'Range loop
1483 if File.Form (Start) = WC_Encoding_Letters (J) then
1484 File.WC_Method := J;
1491 Raise_Exception (Use_Error'Identity, "invalid WCEM form parameter");
1500 (File : in File_Type;
1501 Spacing : in Positive_Count := 1)
1506 -- Raise Constraint_Error if out of range value. The reason for this
1507 -- explicit test is that we don't want junk values around, even if
1508 -- checks are off in the caller.
1510 if Spacing not in Positive_Count then
1511 raise Constraint_Error;
1514 FIO.Check_Read_Status (AP (File));
1516 for L in 1 .. Spacing loop
1517 if File.Before_LM then
1518 File.Before_LM := False;
1519 File.Before_LM_PM := False;
1524 -- If at end of file now, then immediately raise End_Error. Note
1525 -- that we can never be positioned between a line mark and a page
1526 -- mark, so if we are at the end of file, we cannot logically be
1527 -- before the implicit page mark that is at the end of the file.
1529 -- For the same reason, we do not need an explicit check for a
1530 -- page mark. If there is a FF in the middle of a line, the file
1531 -- is not in canonical format and we do not care about the page
1532 -- numbers for files other than ones in canonical format.
1538 -- If not at end of file, then loop till we get to an LM or EOF.
1539 -- The latter case happens only in non-canonical files where the
1540 -- last line is not terminated by LM, but we don't want to blow
1541 -- up for such files, so we assume an implicit LM in this case.
1544 exit when ch = LM or ch = EOF;
1549 -- We have got past a line mark, now, for a regular file only,
1550 -- see if a page mark immediately follows this line mark and
1551 -- if so, skip past the page mark as well. We do not do this
1552 -- for non-regular files, since it would cause an undesirable
1553 -- wait for an additional character.
1556 File.Line := File.Line + 1;
1558 if File.Before_LM_PM then
1559 File.Page := File.Page + 1;
1561 File.Before_LM_PM := False;
1563 elsif File.Is_Regular_File then
1566 -- Page mark can be explicit, or implied at the end of the file
1568 if (ch = PM or else ch = EOF)
1569 and then File.Is_Regular_File
1571 File.Page := File.Page + 1;
1580 File.Before_Wide_Character := False;
1583 procedure Skip_Line (Spacing : in Positive_Count := 1) is
1585 Skip_Line (Current_In, Spacing);
1592 procedure Skip_Page (File : in File_Type) is
1596 FIO.Check_Read_Status (AP (File));
1598 -- If at page mark already, just skip it
1600 if File.Before_LM_PM then
1601 File.Before_LM := False;
1602 File.Before_LM_PM := False;
1603 File.Page := File.Page + 1;
1609 -- This is a bit tricky, if we are logically before an LM then
1610 -- it is not an error if we are at an end of file now, since we
1611 -- are not really at it.
1613 if File.Before_LM then
1614 File.Before_LM := False;
1615 File.Before_LM_PM := False;
1618 -- Otherwise we do raise End_Error if we are at the end of file now
1628 -- Now we can just rumble along to the next page mark, or to the
1629 -- end of file, if that comes first. The latter case happens when
1630 -- the page mark is implied at the end of file.
1634 or else (ch = PM and then File.Is_Regular_File);
1638 File.Page := File.Page + 1;
1641 File.Before_Wide_Character := False;
1644 procedure Skip_Page is
1646 Skip_Page (Current_In);
1649 --------------------
1650 -- Standard_Error --
1651 --------------------
1653 function Standard_Error return File_Type is
1655 return Standard_Err;
1658 function Standard_Error return File_Access is
1660 return Standard_Err'Access;
1663 --------------------
1664 -- Standard_Input --
1665 --------------------
1667 function Standard_Input return File_Type is
1672 function Standard_Input return File_Access is
1674 return Standard_In'Access;
1677 ---------------------
1678 -- Standard_Output --
1679 ---------------------
1681 function Standard_Output return File_Type is
1683 return Standard_Out;
1684 end Standard_Output;
1686 function Standard_Output return File_Access is
1688 return Standard_Out'Access;
1689 end Standard_Output;
1691 --------------------
1692 -- Terminate_Line --
1693 --------------------
1695 procedure Terminate_Line (File : File_Type) is
1697 FIO.Check_File_Open (AP (File));
1699 -- For file other than In_File, test for needing to terminate last line
1701 if Mode (File) /= In_File then
1703 -- If not at start of line definition need new line
1705 if File.Col /= 1 then
1708 -- For files other than standard error and standard output, we
1709 -- make sure that an empty file has a single line feed, so that
1710 -- it is properly formatted. We avoid this for the standard files
1711 -- because it is too much of a nuisance to have these odd line
1712 -- feeds when nothing has been written to the file.
1714 elsif (File /= Standard_Err and then File /= Standard_Out)
1715 and then (File.Line = 1 and then File.Page = 1)
1726 procedure Ungetc (ch : int; File : File_Type) is
1729 if ungetc (ch, File.Stream) = EOF then
1739 -- This is the primitive Stream Write routine, used when a Text_IO file
1740 -- is treated directly as a stream using Text_IO.Streams.Stream.
1743 (File : in out Wide_Text_AFCB;
1744 Item : in Stream_Element_Array)
1746 Siz : constant size_t := Item'Length;
1749 if File.Mode = FCB.In_File then
1753 -- Now we do the write. Since this is a text file, it is normally in
1754 -- text mode, but stream data must be written in binary mode, so we
1755 -- temporarily set binary mode for the write, resetting it after.
1756 -- These calls have no effect in a system (like Unix) where there is
1757 -- no distinction between text and binary files.
1759 set_binary_mode (fileno (File.Stream));
1761 if fwrite (Item'Address, 1, Siz, File.Stream) /= Siz then
1765 set_text_mode (fileno (File.Stream));
1768 -- Use "preallocated" strings to avoid calling "new" during the
1769 -- elaboration of the run time. This is needed in the tasking case to
1770 -- avoid calling Task_Lock too early. A filename is expected to end with
1771 -- a null character in the runtime, here the null characters are added
1772 -- just to have a correct filename length.
1774 Err_Name : aliased String := "*stderr" & ASCII.Nul;
1775 In_Name : aliased String := "*stdin" & ASCII.Nul;
1776 Out_Name : aliased String := "*stdout" & ASCII.Nul;
1779 -------------------------------
1780 -- Initialize Standard Files --
1781 -------------------------------
1783 for J in WC_Encoding_Method loop
1784 if WC_Encoding = WC_Encoding_Letters (J) then
1789 -- Note: the names in these files are bogus, and probably it would be
1790 -- better for these files to have no names, but the ACVC test insist!
1791 -- We use names that are bound to fail in open etc.
1793 Standard_Err.Stream := stderr;
1794 Standard_Err.Name := Err_Name'Access;
1795 Standard_Err.Form := Null_Str'Unrestricted_Access;
1796 Standard_Err.Mode := FCB.Out_File;
1797 Standard_Err.Is_Regular_File := is_regular_file (fileno (stderr)) /= 0;
1798 Standard_Err.Is_Temporary_File := False;
1799 Standard_Err.Is_System_File := True;
1800 Standard_Err.Is_Text_File := True;
1801 Standard_Err.Access_Method := 'T';
1802 Standard_Err.WC_Method := Default_WCEM;
1804 Standard_In.Stream := stdin;
1805 Standard_In.Name := In_Name'Access;
1806 Standard_In.Form := Null_Str'Unrestricted_Access;
1807 Standard_In.Mode := FCB.In_File;
1808 Standard_In.Is_Regular_File := is_regular_file (fileno (stdin)) /= 0;
1809 Standard_In.Is_Temporary_File := False;
1810 Standard_In.Is_System_File := True;
1811 Standard_In.Is_Text_File := True;
1812 Standard_In.Access_Method := 'T';
1813 Standard_In.WC_Method := Default_WCEM;
1815 Standard_Out.Stream := stdout;
1816 Standard_Out.Name := Out_Name'Access;
1817 Standard_Out.Form := Null_Str'Unrestricted_Access;
1818 Standard_Out.Mode := FCB.Out_File;
1819 Standard_Out.Is_Regular_File := is_regular_file (fileno (stdout)) /= 0;
1820 Standard_Out.Is_Temporary_File := False;
1821 Standard_Out.Is_System_File := True;
1822 Standard_Out.Is_Text_File := True;
1823 Standard_Out.Access_Method := 'T';
1824 Standard_Out.WC_Method := Default_WCEM;
1826 FIO.Chain_File (AP (Standard_In));
1827 FIO.Chain_File (AP (Standard_Out));
1828 FIO.Chain_File (AP (Standard_Err));
1830 FIO.Make_Unbuffered (AP (Standard_Out));
1831 FIO.Make_Unbuffered (AP (Standard_Err));
1833 end Ada.Wide_Text_IO;