1 ------------------------------------------------------------------------------
3 -- GNAT RUNTIME COMPONENTS --
5 -- A D A . 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.Streams; use Ada.Streams;
35 with Interfaces.C_Streams; use Interfaces.C_Streams;
38 with Unchecked_Conversion;
39 with Unchecked_Deallocation;
41 pragma Elaborate_All (System.File_IO);
42 -- Needed because of calls to Chain_File in package body elaboration
44 package body Ada.Text_IO is
46 package FIO renames System.File_IO;
48 subtype AP is FCB.AFCB_Ptr;
50 function To_FCB is new Unchecked_Conversion (File_Mode, FCB.File_Mode);
51 function To_TIO is new Unchecked_Conversion (FCB.File_Mode, File_Mode);
52 use type FCB.File_Mode;
58 function AFCB_Allocate (Control_Block : Text_AFCB) return FCB.AFCB_Ptr is
59 pragma Unreferenced (Control_Block);
69 procedure AFCB_Close (File : access Text_AFCB) is
71 -- If the file being closed is one of the current files, then close
72 -- the corresponding current file. It is not clear that this action
73 -- is required (RM A.10.3(23)) but it seems reasonable, and besides
74 -- ACVC test CE3208A expects this behavior.
76 if File_Type (File) = Current_In then
78 elsif File_Type (File) = Current_Out then
80 elsif File_Type (File) = Current_Err then
84 Terminate_Line (File_Type (File));
91 procedure AFCB_Free (File : access Text_AFCB) is
92 type FCB_Ptr is access all Text_AFCB;
93 FT : FCB_Ptr := FCB_Ptr (File);
95 procedure Free is new Unchecked_Deallocation (Text_AFCB, FCB_Ptr);
105 procedure Close (File : in out File_Type) is
107 FIO.Close (AP (File));
114 -- Note: we assume that it is impossible in practice for the column
115 -- to exceed the value of Count'Last, i.e. no check is required for
116 -- overflow raising layout error.
118 function Col (File : in File_Type) return Positive_Count is
120 FIO.Check_File_Open (AP (File));
124 function Col return Positive_Count is
126 return Col (Current_Out);
134 (File : in out File_Type;
135 Mode : in File_Mode := Out_File;
136 Name : in String := "";
137 Form : in String := "")
139 Dummy_File_Control_Block : Text_AFCB;
140 pragma Warnings (Off, Dummy_File_Control_Block);
141 -- Yes, we know this is never assigned a value, only the tag
142 -- is used for dispatching purposes, so that's expected.
145 FIO.Open (File_Ptr => AP (File),
146 Dummy_FCB => Dummy_File_Control_Block,
147 Mode => To_FCB (Mode),
161 function Current_Error return File_Type is
166 function Current_Error return File_Access is
168 return Current_Err.Self'Access;
175 function Current_Input return File_Type is
180 function Current_Input return File_Access is
182 return Current_In.Self'Access;
189 function Current_Output return File_Type is
194 function Current_Output return File_Access is
196 return Current_Out.Self'Access;
203 procedure Delete (File : in out File_Type) is
205 FIO.Delete (AP (File));
212 function End_Of_File (File : in File_Type) return Boolean is
216 FIO.Check_Read_Status (AP (File));
218 if File.Before_LM then
220 if File.Before_LM_PM then
221 return Nextc (File) = EOF;
235 File.Before_LM := True;
239 -- Here we are just past the line mark with Before_LM set so that we
240 -- do not have to try to back up past the LM, thus avoiding the need
241 -- to back up more than one character.
248 elsif ch = PM and then File.Is_Regular_File then
249 File.Before_LM_PM := True;
250 return Nextc (File) = EOF;
252 -- Here if neither EOF nor PM followed end of line
261 function End_Of_File return Boolean is
263 return End_Of_File (Current_In);
270 function End_Of_Line (File : in File_Type) return Boolean is
274 FIO.Check_Read_Status (AP (File));
276 if File.Before_LM then
292 function End_Of_Line return Boolean is
294 return End_Of_Line (Current_In);
301 function End_Of_Page (File : in File_Type) return Boolean is
305 FIO.Check_Read_Status (AP (File));
307 if not File.Is_Regular_File then
310 elsif File.Before_LM then
311 if File.Before_LM_PM then
326 File.Before_LM := True;
330 -- Here we are just past the line mark with Before_LM set so that we
331 -- do not have to try to back up past the LM, thus avoiding the need
332 -- to back up more than one character.
336 return ch = PM or else ch = EOF;
339 function End_Of_Page return Boolean is
341 return End_Of_Page (Current_In);
348 function EOF_Char return Integer is
357 procedure Flush (File : in File_Type) is
359 FIO.Flush (AP (File));
371 function Form (File : in File_Type) return String is
373 return FIO.Form (AP (File));
381 (File : in File_Type;
382 Item : out Character)
387 FIO.Check_Read_Status (AP (File));
389 if File.Before_LM then
390 File.Before_LM := False;
393 if File.Before_LM_PM then
395 File.Page := File.Page + 1;
396 File.Before_LM_PM := False;
398 File.Line := File.Line + 1;
409 File.Line := File.Line + 1;
412 elsif ch = PM and then File.Is_Regular_File then
413 File.Page := File.Page + 1;
417 Item := Character'Val (ch);
418 File.Col := File.Col + 1;
424 procedure Get (Item : out Character) is
426 Get (Current_In, Item);
430 (File : in File_Type;
437 FIO.Check_Read_Status (AP (File));
439 if File.Before_LM then
440 File.Before_LM := False;
441 File.Before_LM_PM := False;
444 if File.Before_LM_PM then
446 File.Page := File.Page + 1;
447 File.Before_LM_PM := False;
450 File.Line := File.Line + 1;
455 while J <= Item'Last loop
462 File.Line := File.Line + 1;
465 elsif ch = PM and then File.Is_Regular_File then
466 File.Page := File.Page + 1;
470 Item (J) := Character'Val (ch);
472 File.Col := File.Col + 1;
477 procedure Get (Item : out String) is
479 Get (Current_In, Item);
486 -- More work required here ???
488 procedure Get_Immediate
489 (File : in File_Type;
490 Item : out Character)
495 procedure getc_immediate
498 end_of_file : out int);
499 pragma Import (C, getc_immediate, "getc_immediate");
502 FIO.Check_Read_Status (AP (File));
504 if File.Before_LM then
505 File.Before_LM := False;
506 File.Before_LM_PM := False;
510 getc_immediate (File.Stream, ch, end_of_file);
512 if ferror (File.Stream) /= 0 then
514 elsif end_of_file /= 0 then
519 Item := Character'Val (ch);
522 procedure Get_Immediate
523 (Item : out Character)
526 Get_Immediate (Current_In, Item);
529 procedure Get_Immediate
530 (File : in File_Type;
531 Item : out Character;
532 Available : out Boolean)
538 procedure getc_immediate_nowait
541 end_of_file : out int;
543 pragma Import (C, getc_immediate_nowait, "getc_immediate_nowait");
546 FIO.Check_Read_Status (AP (File));
548 -- If we are logically before an end of line, but physically after it,
549 -- then we just return the end of line character, no I/O is necessary.
551 if File.Before_LM then
552 File.Before_LM := False;
553 File.Before_LM_PM := False;
556 Item := Character'Val (LM);
558 -- Normal case where a read operation is required
561 getc_immediate_nowait (File.Stream, ch, end_of_file, avail);
563 if ferror (File.Stream) /= 0 then
566 elsif end_of_file /= 0 then
575 Item := Character'Val (ch);
581 procedure Get_Immediate
582 (Item : out Character;
583 Available : out Boolean)
586 Get_Immediate (Current_In, Item, Available);
594 (File : in File_Type;
601 FIO.Check_Read_Status (AP (File));
602 Last := Item'First - 1;
604 -- Immediate exit for null string, this is a case in which we do not
605 -- need to test for end of file and we do not skip a line mark under
606 -- any circumstances.
608 if Last >= Item'Last then
612 -- Here we have at least one character, if we are immediately before
613 -- a line mark, then we will just skip past it storing no characters.
615 if File.Before_LM then
616 File.Before_LM := False;
617 File.Before_LM_PM := False;
619 -- Otherwise we need to read some characters
624 -- If we are at the end of file now, it means we are trying to
625 -- skip a file terminator and we raise End_Error (RM A.10.7(20))
631 -- Loop through characters. Don't bother if we hit a page mark,
632 -- since in normal files, page marks can only follow line marks
633 -- in any case and we only promise to treat the page nonsense
634 -- correctly in the absense of such rogue page marks.
637 -- Exit the loop if read is terminated by encountering line mark
641 -- Otherwise store the character, note that we know that ch is
642 -- something other than LM or EOF. It could possibly be a page
643 -- mark if there is a stray page mark in the middle of a line,
644 -- but this is not an official page mark in any case, since
645 -- official page marks can only follow a line mark. The whole
646 -- page business is pretty much nonsense anyway, so we do not
647 -- want to waste time trying to make sense out of non-standard
648 -- page marks in the file! This means that the behavior of
649 -- Get_Line is different from repeated Get of a character, but
650 -- that's too bad. We only promise that page numbers etc make
651 -- sense if the file is formatted in a standard manner.
653 -- Note: we do not adjust the column number because it is quicker
654 -- to adjust it once at the end of the operation than incrementing
655 -- it each time around the loop.
658 Item (Last) := Character'Val (ch);
660 -- All done if the string is full, this is the case in which
661 -- we do not skip the following line mark. We need to adjust
662 -- the column number in this case.
664 if Last = Item'Last then
665 File.Col := File.Col + Count (Item'Length);
669 -- Otherwise read next character. We also exit from the loop if
670 -- we read an end of file. This is the case where the last line
671 -- is not terminated with a line mark, and we consider that there
672 -- is an implied line mark in this case (this is a non-standard
673 -- file, but it is nice to treat it reasonably).
680 -- We have skipped past, but not stored, a line mark. Skip following
681 -- page mark if one follows, but do not do this for a non-regular
682 -- file (since otherwise we get annoying wait for an extra character)
684 File.Line := File.Line + 1;
687 if File.Before_LM_PM then
689 File.Before_LM_PM := False;
690 File.Page := File.Page + 1;
692 elsif File.Is_Regular_File then
695 if ch = PM and then File.Is_Regular_File then
697 File.Page := File.Page + 1;
709 Get_Line (Current_In, Item, Last);
716 function Getc (File : File_Type) return int is
720 ch := fgetc (File.Stream);
722 if ch = EOF and then ferror (File.Stream) /= 0 then
733 function Is_Open (File : in File_Type) return Boolean is
735 return FIO.Is_Open (AP (File));
742 -- Note: we assume that it is impossible in practice for the line
743 -- to exceed the value of Count'Last, i.e. no check is required for
744 -- overflow raising layout error.
746 function Line (File : in File_Type) return Positive_Count is
748 FIO.Check_File_Open (AP (File));
752 function Line return Positive_Count is
754 return Line (Current_Out);
761 function Line_Length (File : in File_Type) return Count is
763 FIO.Check_Write_Status (AP (File));
764 return File.Line_Length;
767 function Line_Length return Count is
769 return Line_Length (Current_Out);
777 (File : in File_Type;
778 Item : out Character;
779 End_Of_Line : out Boolean)
784 FIO.Check_Read_Status (AP (File));
786 if File.Before_LM then
795 or else (ch = PM and then File.Is_Regular_File)
800 End_Of_Line := False;
801 Item := Character'Val (ch);
807 (Item : out Character;
808 End_Of_Line : out Boolean)
811 Look_Ahead (Current_In, Item, End_Of_Line);
818 function Mode (File : in File_Type) return File_Mode is
820 return To_TIO (FIO.Mode (AP (File)));
827 function Name (File : in File_Type) return String is
829 return FIO.Name (AP (File));
837 (File : in File_Type;
838 Spacing : in Positive_Count := 1)
841 -- Raise Constraint_Error if out of range value. The reason for this
842 -- explicit test is that we don't want junk values around, even if
843 -- checks are off in the caller.
845 if Spacing not in Positive_Count then
846 raise Constraint_Error;
849 FIO.Check_Write_Status (AP (File));
851 for K in 1 .. Spacing loop
853 File.Line := File.Line + 1;
855 if File.Page_Length /= 0
856 and then File.Line > File.Page_Length
860 File.Page := File.Page + 1;
867 procedure New_Line (Spacing : in Positive_Count := 1) is
869 New_Line (Current_Out, Spacing);
876 procedure New_Page (File : in File_Type) is
878 FIO.Check_Write_Status (AP (File));
880 if File.Col /= 1 or else File.Line = 1 then
885 File.Page := File.Page + 1;
890 procedure New_Page is
892 New_Page (Current_Out);
899 function Nextc (File : File_Type) return int is
903 ch := fgetc (File.Stream);
906 if ferror (File.Stream) /= 0 then
911 if ungetc (ch, File.Stream) = EOF then
924 (File : in out File_Type;
927 Form : in String := "")
929 Dummy_File_Control_Block : Text_AFCB;
930 pragma Warnings (Off, Dummy_File_Control_Block);
931 -- Yes, we know this is never assigned a value, only the tag
932 -- is used for dispatching purposes, so that's expected.
935 FIO.Open (File_Ptr => AP (File),
936 Dummy_FCB => Dummy_File_Control_Block,
937 Mode => To_FCB (Mode),
951 -- Note: we assume that it is impossible in practice for the page
952 -- to exceed the value of Count'Last, i.e. no check is required for
953 -- overflow raising layout error.
955 function Page (File : in File_Type) return Positive_Count is
957 FIO.Check_File_Open (AP (File));
961 function Page return Positive_Count is
963 return Page (Current_Out);
970 function Page_Length (File : in File_Type) return Count is
972 FIO.Check_Write_Status (AP (File));
973 return File.Page_Length;
976 function Page_Length return Count is
978 return Page_Length (Current_Out);
986 (File : in File_Type;
990 FIO.Check_Write_Status (AP (File));
992 if File.Line_Length /= 0 and then File.Col > File.Line_Length then
996 if fputc (Character'Pos (Item), File.Stream) = EOF then
1000 File.Col := File.Col + 1;
1003 procedure Put (Item : in Character) is
1005 FIO.Check_Write_Status (AP (Current_Out));
1007 if Current_Out.Line_Length /= 0
1008 and then Current_Out.Col > Current_Out.Line_Length
1010 New_Line (Current_Out);
1013 if fputc (Character'Pos (Item), Current_Out.Stream) = EOF then
1017 Current_Out.Col := Current_Out.Col + 1;
1025 (File : in File_Type;
1029 FIO.Check_Write_Status (AP (File));
1031 if Item'Length > 0 then
1033 -- If we have bounded lines, then do things character by
1034 -- character (this seems a rare case anyway!)
1036 if File.Line_Length /= 0 then
1037 for J in Item'Range loop
1038 Put (File, Item (J));
1041 -- Otherwise we can output the entire string at once. Note that if
1042 -- there are LF or FF characters in the string, we do not bother to
1043 -- count them as line or page terminators.
1046 FIO.Write_Buf (AP (File), Item'Address, Item'Length);
1047 File.Col := File.Col + Item'Length;
1052 procedure Put (Item : in String) is
1054 Put (Current_Out, Item);
1062 (File : in File_Type;
1065 Ilen : Natural := Item'Length;
1066 Istart : Natural := Item'First;
1069 FIO.Check_Write_Status (AP (File));
1071 -- If we have bounded lines, then just do a put and a new line. In
1072 -- this case we will end up doing things character by character in
1073 -- any case, and it is a rare situation.
1075 if File.Line_Length /= 0 then
1081 -- We setup a single string that has the necessary terminators and
1082 -- then write it with a single call. The reason for doing this is
1083 -- that it gives better behavior for the use of Put_Line in multi-
1084 -- tasking programs, since often the OS will treat the entire put
1085 -- operation as an atomic operation.
1087 -- We only do this if the message is 512 characters or less in length,
1088 -- since otherwise Put_Line would use an unbounded amount of stack
1089 -- space and could cause undetected stack overflow. If we have a
1090 -- longer string, then output the first part separately to avoid this.
1093 FIO.Write_Buf (AP (File), Item'Address, size_t (Ilen - 512));
1094 Istart := Istart + Ilen - 512;
1098 -- Now prepare the string with its terminator
1101 Buffer : String (1 .. Ilen + 2);
1105 Buffer (1 .. Ilen) := Item (Istart .. Item'Last);
1106 Buffer (Ilen + 1) := Character'Val (LM);
1108 if File.Page_Length /= 0
1109 and then File.Line > File.Page_Length
1111 Buffer (Ilen + 2) := Character'Val (PM);
1112 Plen := size_t (Ilen) + 2;
1114 File.Page := File.Page + 1;
1117 Plen := size_t (Ilen) + 1;
1118 File.Line := File.Line + 1;
1121 FIO.Write_Buf (AP (File), Buffer'Address, Plen);
1127 procedure Put_Line (Item : in String) is
1129 Put_Line (Current_Out, Item);
1136 procedure Putc (ch : int; File : File_Type) is
1138 if fputc (ch, File.Stream) = EOF then
1147 -- This is the primitive Stream Read routine, used when a Text_IO file
1148 -- is treated directly as a stream using Text_IO.Streams.Stream.
1151 (File : in out Text_AFCB;
1152 Item : out Stream_Element_Array;
1153 Last : out Stream_Element_Offset)
1156 pragma Warnings (Off, Discard_ch);
1159 if File.Mode /= FCB.In_File then
1163 -- Deal with case where our logical and physical position do not match
1164 -- because of being after an LM or LM-PM sequence when in fact we are
1165 -- logically positioned before it.
1167 if File.Before_LM then
1169 -- If we are before a PM, then it is possible for a stream read
1170 -- to leave us after the LM and before the PM, which is a bit
1171 -- odd. The easiest way to deal with this is to unget the PM,
1172 -- so we are indeed positioned between the characters. This way
1173 -- further stream read operations will work correctly, and the
1174 -- effect on text processing is a little weird, but what can
1175 -- be expected if stream and text input are mixed this way?
1177 if File.Before_LM_PM then
1178 Discard_ch := ungetc (PM, File.Stream);
1179 File.Before_LM_PM := False;
1182 File.Before_LM := False;
1184 Item (Item'First) := Stream_Element (Character'Pos (ASCII.LF));
1186 if Item'Length = 1 then
1192 Stream_Element_Offset
1193 (fread (buffer => Item'Address,
1194 index => size_t (Item'First + 1),
1196 count => Item'Length - 1,
1197 stream => File.Stream));
1203 -- Now we do the read. Since this is a text file, it is normally in
1204 -- text mode, but stream data must be read in binary mode, so we
1205 -- temporarily set binary mode for the read, resetting it after.
1206 -- These calls have no effect in a system (like Unix) where there is
1207 -- no distinction between text and binary files.
1209 set_binary_mode (fileno (File.Stream));
1213 Stream_Element_Offset
1214 (fread (Item'Address, 1, Item'Length, File.Stream)) - 1;
1216 if Last < Item'Last then
1217 if ferror (File.Stream) /= 0 then
1222 set_text_mode (fileno (File.Stream));
1230 (File : in out File_Type;
1231 Mode : in File_Mode)
1234 -- Don't allow change of mode for current file (RM A.10.2(5))
1236 if (File = Current_In or else
1237 File = Current_Out or else
1238 File = Current_Error)
1239 and then To_FCB (Mode) /= File.Mode
1244 Terminate_Line (File);
1245 FIO.Reset (AP (File), To_FCB (Mode));
1249 File.Line_Length := 0;
1250 File.Page_Length := 0;
1251 File.Before_LM := False;
1252 File.Before_LM_PM := False;
1255 procedure Reset (File : in out File_Type) is
1257 Terminate_Line (File);
1258 FIO.Reset (AP (File));
1262 File.Line_Length := 0;
1263 File.Page_Length := 0;
1264 File.Before_LM := False;
1265 File.Before_LM_PM := False;
1273 (File : in File_Type;
1274 To : in Positive_Count)
1279 -- Raise Constraint_Error if out of range value. The reason for this
1280 -- explicit test is that we don't want junk values around, even if
1281 -- checks are off in the caller.
1283 if To not in Positive_Count then
1284 raise Constraint_Error;
1287 FIO.Check_File_Open (AP (File));
1289 if To = File.Col then
1293 if Mode (File) >= Out_File then
1294 if File.Line_Length /= 0 and then To > File.Line_Length then
1298 if To < File.Col then
1302 while File.Col < To loop
1314 File.Line := File.Line + 1;
1317 elsif ch = PM and then File.Is_Regular_File then
1318 File.Page := File.Page + 1;
1322 elsif To = File.Col then
1327 File.Col := File.Col + 1;
1333 procedure Set_Col (To : in Positive_Count) is
1335 Set_Col (Current_Out, To);
1342 procedure Set_Error (File : in File_Type) is
1344 FIO.Check_Write_Status (AP (File));
1345 Current_Err := File;
1352 procedure Set_Input (File : in File_Type) is
1354 FIO.Check_Read_Status (AP (File));
1363 (File : in File_Type;
1364 To : in Positive_Count)
1367 -- Raise Constraint_Error if out of range value. The reason for this
1368 -- explicit test is that we don't want junk values around, even if
1369 -- checks are off in the caller.
1371 if To not in Positive_Count then
1372 raise Constraint_Error;
1375 FIO.Check_File_Open (AP (File));
1377 if To = File.Line then
1381 if Mode (File) >= Out_File then
1382 if File.Page_Length /= 0 and then To > File.Page_Length then
1386 if To < File.Line then
1390 while File.Line < To loop
1395 while To /= File.Line loop
1401 procedure Set_Line (To : in Positive_Count) is
1403 Set_Line (Current_Out, To);
1406 ---------------------
1407 -- Set_Line_Length --
1408 ---------------------
1410 procedure Set_Line_Length (File : in File_Type; To : in Count) is
1412 -- Raise Constraint_Error if out of range value. The reason for this
1413 -- explicit test is that we don't want junk values around, even if
1414 -- checks are off in the caller.
1416 if To not in Count then
1417 raise Constraint_Error;
1420 FIO.Check_Write_Status (AP (File));
1421 File.Line_Length := To;
1422 end Set_Line_Length;
1424 procedure Set_Line_Length (To : in Count) is
1426 Set_Line_Length (Current_Out, To);
1427 end Set_Line_Length;
1433 procedure Set_Output (File : in File_Type) is
1435 FIO.Check_Write_Status (AP (File));
1436 Current_Out := File;
1439 ---------------------
1440 -- Set_Page_Length --
1441 ---------------------
1443 procedure Set_Page_Length (File : in File_Type; To : in Count) is
1445 -- Raise Constraint_Error if out of range value. The reason for this
1446 -- explicit test is that we don't want junk values around, even if
1447 -- checks are off in the caller.
1449 if To not in Count then
1450 raise Constraint_Error;
1453 FIO.Check_Write_Status (AP (File));
1454 File.Page_Length := To;
1455 end Set_Page_Length;
1457 procedure Set_Page_Length (To : in Count) is
1459 Set_Page_Length (Current_Out, To);
1460 end Set_Page_Length;
1467 (File : in File_Type;
1468 Spacing : in Positive_Count := 1)
1473 -- Raise Constraint_Error if out of range value. The reason for this
1474 -- explicit test is that we don't want junk values around, even if
1475 -- checks are off in the caller.
1477 if Spacing not in Positive_Count then
1478 raise Constraint_Error;
1481 FIO.Check_Read_Status (AP (File));
1483 for L in 1 .. Spacing loop
1484 if File.Before_LM then
1485 File.Before_LM := False;
1486 File.Before_LM_PM := False;
1491 -- If at end of file now, then immediately raise End_Error. Note
1492 -- that we can never be positioned between a line mark and a page
1493 -- mark, so if we are at the end of file, we cannot logically be
1494 -- before the implicit page mark that is at the end of the file.
1496 -- For the same reason, we do not need an explicit check for a
1497 -- page mark. If there is a FF in the middle of a line, the file
1498 -- is not in canonical format and we do not care about the page
1499 -- numbers for files other than ones in canonical format.
1505 -- If not at end of file, then loop till we get to an LM or EOF.
1506 -- The latter case happens only in non-canonical files where the
1507 -- last line is not terminated by LM, but we don't want to blow
1508 -- up for such files, so we assume an implicit LM in this case.
1511 exit when ch = LM or ch = EOF;
1516 -- We have got past a line mark, now, for a regular file only,
1517 -- see if a page mark immediately follows this line mark and
1518 -- if so, skip past the page mark as well. We do not do this
1519 -- for non-regular files, since it would cause an undesirable
1520 -- wait for an additional character.
1523 File.Line := File.Line + 1;
1525 if File.Before_LM_PM then
1526 File.Page := File.Page + 1;
1528 File.Before_LM_PM := False;
1530 elsif File.Is_Regular_File then
1533 -- Page mark can be explicit, or implied at the end of the file
1535 if (ch = PM or else ch = EOF)
1536 and then File.Is_Regular_File
1538 File.Page := File.Page + 1;
1548 procedure Skip_Line (Spacing : in Positive_Count := 1) is
1550 Skip_Line (Current_In, Spacing);
1557 procedure Skip_Page (File : in File_Type) is
1561 FIO.Check_Read_Status (AP (File));
1563 -- If at page mark already, just skip it
1565 if File.Before_LM_PM then
1566 File.Before_LM := False;
1567 File.Before_LM_PM := False;
1568 File.Page := File.Page + 1;
1574 -- This is a bit tricky, if we are logically before an LM then
1575 -- it is not an error if we are at an end of file now, since we
1576 -- are not really at it.
1578 if File.Before_LM then
1579 File.Before_LM := False;
1580 File.Before_LM_PM := False;
1583 -- Otherwise we do raise End_Error if we are at the end of file now
1593 -- Now we can just rumble along to the next page mark, or to the
1594 -- end of file, if that comes first. The latter case happens when
1595 -- the page mark is implied at the end of file.
1599 or else (ch = PM and then File.Is_Regular_File);
1603 File.Page := File.Page + 1;
1608 procedure Skip_Page is
1610 Skip_Page (Current_In);
1613 --------------------
1614 -- Standard_Error --
1615 --------------------
1617 function Standard_Error return File_Type is
1619 return Standard_Err;
1622 function Standard_Error return File_Access is
1624 return Standard_Err'Access;
1627 --------------------
1628 -- Standard_Input --
1629 --------------------
1631 function Standard_Input return File_Type is
1636 function Standard_Input return File_Access is
1638 return Standard_In'Access;
1641 ---------------------
1642 -- Standard_Output --
1643 ---------------------
1645 function Standard_Output return File_Type is
1647 return Standard_Out;
1648 end Standard_Output;
1650 function Standard_Output return File_Access is
1652 return Standard_Out'Access;
1653 end Standard_Output;
1655 --------------------
1656 -- Terminate_Line --
1657 --------------------
1659 procedure Terminate_Line (File : File_Type) is
1661 FIO.Check_File_Open (AP (File));
1663 -- For file other than In_File, test for needing to terminate last line
1665 if Mode (File) /= In_File then
1667 -- If not at start of line definition need new line
1669 if File.Col /= 1 then
1672 -- For files other than standard error and standard output, we
1673 -- make sure that an empty file has a single line feed, so that
1674 -- it is properly formatted. We avoid this for the standard files
1675 -- because it is too much of a nuisance to have these odd line
1676 -- feeds when nothing has been written to the file.
1678 elsif (File /= Standard_Err and then File /= Standard_Out)
1679 and then (File.Line = 1 and then File.Page = 1)
1690 procedure Ungetc (ch : int; File : File_Type) is
1693 if ungetc (ch, File.Stream) = EOF then
1703 -- This is the primitive Stream Write routine, used when a Text_IO file
1704 -- is treated directly as a stream using Text_IO.Streams.Stream.
1707 (File : in out Text_AFCB;
1708 Item : in Stream_Element_Array)
1711 function Has_Translated_Characters return Boolean;
1712 -- return True if Item array contains a character which will be
1713 -- translated under the text file mode. There is only one such
1714 -- character under DOS based systems which is character 10.
1716 text_translation_required : Boolean;
1717 pragma Import (C, text_translation_required,
1718 "__gnat_text_translation_required");
1720 Siz : constant size_t := Item'Length;
1722 function Has_Translated_Characters return Boolean is
1724 for K in Item'Range loop
1725 if Item (K) = 10 then
1730 end Has_Translated_Characters;
1732 Needs_Binary_Write : constant Boolean :=
1733 text_translation_required and then Has_Translated_Characters;
1736 if File.Mode = FCB.In_File then
1740 -- Now we do the write. Since this is a text file, it is normally in
1741 -- text mode, but stream data must be written in binary mode, so we
1742 -- temporarily set binary mode for the write, resetting it after. This
1743 -- is done only if needed (i.e. there is some characters in Item which
1744 -- needs to be written using the binary mode).
1745 -- These calls have no effect in a system (like Unix) where there is
1746 -- no distinction between text and binary files.
1748 -- Since the character translation is done at the time the buffer is
1749 -- written (this is true under Windows) we first flush current buffer
1750 -- with text mode if needed.
1752 if Needs_Binary_Write then
1754 if fflush (File.Stream) = -1 then
1758 set_binary_mode (fileno (File.Stream));
1761 if fwrite (Item'Address, 1, Siz, File.Stream) /= Siz then
1765 -- At this point we need to flush the buffer using the binary mode then
1766 -- we reset to text mode.
1768 if Needs_Binary_Write then
1770 if fflush (File.Stream) = -1 then
1774 set_text_mode (fileno (File.Stream));
1778 -- Use "preallocated" strings to avoid calling "new" during the
1779 -- elaboration of the run time. This is needed in the tasking case to
1780 -- avoid calling Task_Lock too early. A filename is expected to end with a
1781 -- null character in the runtime, here the null characters are added just
1782 -- to have a correct filename length.
1784 Err_Name : aliased String := "*stderr" & ASCII.Nul;
1785 In_Name : aliased String := "*stdin" & ASCII.Nul;
1786 Out_Name : aliased String := "*stdout" & ASCII.Nul;
1788 -------------------------------
1789 -- Initialize Standard Files --
1790 -------------------------------
1792 -- Note: the names in these files are bogus, and probably it would be
1793 -- better for these files to have no names, but the ACVC test insist!
1794 -- We use names that are bound to fail in open etc.
1796 Standard_Err.Stream := stderr;
1797 Standard_Err.Name := Err_Name'Access;
1798 Standard_Err.Form := Null_Str'Unrestricted_Access;
1799 Standard_Err.Mode := FCB.Out_File;
1800 Standard_Err.Is_Regular_File := is_regular_file (fileno (stderr)) /= 0;
1801 Standard_Err.Is_Temporary_File := False;
1802 Standard_Err.Is_System_File := True;
1803 Standard_Err.Is_Text_File := True;
1804 Standard_Err.Access_Method := 'T';
1805 Standard_Err.Self := Standard_Err;
1807 Standard_In.Stream := stdin;
1808 Standard_In.Name := In_Name'Access;
1809 Standard_In.Form := Null_Str'Unrestricted_Access;
1810 Standard_In.Mode := FCB.In_File;
1811 Standard_In.Is_Regular_File := is_regular_file (fileno (stdin)) /= 0;
1812 Standard_In.Is_Temporary_File := False;
1813 Standard_In.Is_System_File := True;
1814 Standard_In.Is_Text_File := True;
1815 Standard_In.Access_Method := 'T';
1816 Standard_In.Self := Standard_In;
1818 Standard_Out.Stream := stdout;
1819 Standard_Out.Name := Out_Name'Access;
1820 Standard_Out.Form := Null_Str'Unrestricted_Access;
1821 Standard_Out.Mode := FCB.Out_File;
1822 Standard_Out.Is_Regular_File := is_regular_file (fileno (stdout)) /= 0;
1823 Standard_Out.Is_Temporary_File := False;
1824 Standard_Out.Is_System_File := True;
1825 Standard_Out.Is_Text_File := True;
1826 Standard_Out.Access_Method := 'T';
1827 Standard_Out.Self := Standard_Out;
1829 FIO.Chain_File (AP (Standard_In));
1830 FIO.Chain_File (AP (Standard_Out));
1831 FIO.Chain_File (AP (Standard_Err));
1833 FIO.Make_Unbuffered (AP (Standard_Out));
1834 FIO.Make_Unbuffered (AP (Standard_Err));