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;
39 with Unchecked_Conversion;
40 with Unchecked_Deallocation;
42 pragma Elaborate_All (System.File_IO);
43 -- Needed because of calls to Chain_File in package body elaboration
45 package body Ada.Text_IO is
47 package FIO renames System.File_IO;
49 subtype AP is FCB.AFCB_Ptr;
51 function To_FCB is new Unchecked_Conversion (File_Mode, FCB.File_Mode);
52 function To_TIO is new Unchecked_Conversion (FCB.File_Mode, File_Mode);
53 use type FCB.File_Mode;
55 use type System.CRTL.size_t;
61 function AFCB_Allocate (Control_Block : Text_AFCB) return FCB.AFCB_Ptr is
62 pragma Unreferenced (Control_Block);
72 procedure AFCB_Close (File : access Text_AFCB) is
74 -- If the file being closed is one of the current files, then close
75 -- the corresponding current file. It is not clear that this action
76 -- is required (RM A.10.3(23)) but it seems reasonable, and besides
77 -- ACVC test CE3208A expects this behavior.
79 if File_Type (File) = Current_In then
81 elsif File_Type (File) = Current_Out then
83 elsif File_Type (File) = Current_Err then
87 Terminate_Line (File_Type (File));
94 procedure AFCB_Free (File : access Text_AFCB) is
95 type FCB_Ptr is access all Text_AFCB;
96 FT : FCB_Ptr := FCB_Ptr (File);
98 procedure Free is new Unchecked_Deallocation (Text_AFCB, FCB_Ptr);
108 procedure Close (File : in out File_Type) is
110 FIO.Close (AP (File));
117 -- Note: we assume that it is impossible in practice for the column
118 -- to exceed the value of Count'Last, i.e. no check is required for
119 -- overflow raising layout error.
121 function Col (File : in File_Type) return Positive_Count is
123 FIO.Check_File_Open (AP (File));
127 function Col return Positive_Count is
129 return Col (Current_Out);
137 (File : in out File_Type;
138 Mode : in File_Mode := Out_File;
139 Name : in String := "";
140 Form : in String := "")
142 Dummy_File_Control_Block : Text_AFCB;
143 pragma Warnings (Off, Dummy_File_Control_Block);
144 -- Yes, we know this is never assigned a value, only the tag
145 -- is used for dispatching purposes, so that's expected.
148 FIO.Open (File_Ptr => AP (File),
149 Dummy_FCB => Dummy_File_Control_Block,
150 Mode => To_FCB (Mode),
164 function Current_Error return File_Type is
169 function Current_Error return File_Access is
171 return Current_Err.Self'Access;
178 function Current_Input return File_Type is
183 function Current_Input return File_Access is
185 return Current_In.Self'Access;
192 function Current_Output return File_Type is
197 function Current_Output return File_Access is
199 return Current_Out.Self'Access;
206 procedure Delete (File : in out File_Type) is
208 FIO.Delete (AP (File));
215 function End_Of_File (File : in File_Type) return Boolean is
219 FIO.Check_Read_Status (AP (File));
221 if File.Before_LM then
223 if File.Before_LM_PM then
224 return Nextc (File) = EOF;
238 File.Before_LM := True;
242 -- Here we are just past the line mark with Before_LM set so that we
243 -- do not have to try to back up past the LM, thus avoiding the need
244 -- to back up more than one character.
251 elsif ch = PM and then File.Is_Regular_File then
252 File.Before_LM_PM := True;
253 return Nextc (File) = EOF;
255 -- Here if neither EOF nor PM followed end of line
264 function End_Of_File return Boolean is
266 return End_Of_File (Current_In);
273 function End_Of_Line (File : in File_Type) return Boolean is
277 FIO.Check_Read_Status (AP (File));
279 if File.Before_LM then
295 function End_Of_Line return Boolean is
297 return End_Of_Line (Current_In);
304 function End_Of_Page (File : in File_Type) return Boolean is
308 FIO.Check_Read_Status (AP (File));
310 if not File.Is_Regular_File then
313 elsif File.Before_LM then
314 if File.Before_LM_PM then
329 File.Before_LM := True;
333 -- Here we are just past the line mark with Before_LM set so that we
334 -- do not have to try to back up past the LM, thus avoiding the need
335 -- to back up more than one character.
339 return ch = PM or else ch = EOF;
342 function End_Of_Page return Boolean is
344 return End_Of_Page (Current_In);
351 function EOF_Char return Integer is
360 procedure Flush (File : in File_Type) is
362 FIO.Flush (AP (File));
374 function Form (File : in File_Type) return String is
376 return FIO.Form (AP (File));
384 (File : in File_Type;
385 Item : out Character)
390 FIO.Check_Read_Status (AP (File));
392 if File.Before_LM then
393 File.Before_LM := False;
396 if File.Before_LM_PM then
398 File.Page := File.Page + 1;
399 File.Before_LM_PM := False;
401 File.Line := File.Line + 1;
412 File.Line := File.Line + 1;
415 elsif ch = PM and then File.Is_Regular_File then
416 File.Page := File.Page + 1;
420 Item := Character'Val (ch);
421 File.Col := File.Col + 1;
427 procedure Get (Item : out Character) is
429 Get (Current_In, Item);
433 (File : in File_Type;
440 FIO.Check_Read_Status (AP (File));
442 if File.Before_LM then
443 File.Before_LM := False;
444 File.Before_LM_PM := False;
447 if File.Before_LM_PM then
449 File.Page := File.Page + 1;
450 File.Before_LM_PM := False;
453 File.Line := File.Line + 1;
458 while J <= Item'Last loop
465 File.Line := File.Line + 1;
468 elsif ch = PM and then File.Is_Regular_File then
469 File.Page := File.Page + 1;
473 Item (J) := Character'Val (ch);
475 File.Col := File.Col + 1;
480 procedure Get (Item : out String) is
482 Get (Current_In, Item);
489 -- More work required here ???
491 procedure Get_Immediate
492 (File : in File_Type;
493 Item : out Character)
498 procedure getc_immediate
501 end_of_file : out int);
502 pragma Import (C, getc_immediate, "getc_immediate");
505 FIO.Check_Read_Status (AP (File));
507 if File.Before_LM then
508 File.Before_LM := False;
509 File.Before_LM_PM := False;
513 getc_immediate (File.Stream, ch, end_of_file);
515 if ferror (File.Stream) /= 0 then
517 elsif end_of_file /= 0 then
522 Item := Character'Val (ch);
525 procedure Get_Immediate
526 (Item : out Character)
529 Get_Immediate (Current_In, Item);
532 procedure Get_Immediate
533 (File : in File_Type;
534 Item : out Character;
535 Available : out Boolean)
541 procedure getc_immediate_nowait
544 end_of_file : out int;
546 pragma Import (C, getc_immediate_nowait, "getc_immediate_nowait");
549 FIO.Check_Read_Status (AP (File));
551 -- If we are logically before an end of line, but physically after it,
552 -- then we just return the end of line character, no I/O is necessary.
554 if File.Before_LM then
555 File.Before_LM := False;
556 File.Before_LM_PM := False;
559 Item := Character'Val (LM);
561 -- Normal case where a read operation is required
564 getc_immediate_nowait (File.Stream, ch, end_of_file, avail);
566 if ferror (File.Stream) /= 0 then
569 elsif end_of_file /= 0 then
578 Item := Character'Val (ch);
584 procedure Get_Immediate
585 (Item : out Character;
586 Available : out Boolean)
589 Get_Immediate (Current_In, Item, Available);
597 (File : in File_Type;
604 FIO.Check_Read_Status (AP (File));
605 Last := Item'First - 1;
607 -- Immediate exit for null string, this is a case in which we do not
608 -- need to test for end of file and we do not skip a line mark under
609 -- any circumstances.
611 if Last >= Item'Last then
615 -- Here we have at least one character, if we are immediately before
616 -- a line mark, then we will just skip past it storing no characters.
618 if File.Before_LM then
619 File.Before_LM := False;
620 File.Before_LM_PM := False;
622 -- Otherwise we need to read some characters
627 -- If we are at the end of file now, it means we are trying to
628 -- skip a file terminator and we raise End_Error (RM A.10.7(20))
634 -- Loop through characters. Don't bother if we hit a page mark,
635 -- since in normal files, page marks can only follow line marks
636 -- in any case and we only promise to treat the page nonsense
637 -- correctly in the absense of such rogue page marks.
640 -- Exit the loop if read is terminated by encountering line mark
644 -- Otherwise store the character, note that we know that ch is
645 -- something other than LM or EOF. It could possibly be a page
646 -- mark if there is a stray page mark in the middle of a line,
647 -- but this is not an official page mark in any case, since
648 -- official page marks can only follow a line mark. The whole
649 -- page business is pretty much nonsense anyway, so we do not
650 -- want to waste time trying to make sense out of non-standard
651 -- page marks in the file! This means that the behavior of
652 -- Get_Line is different from repeated Get of a character, but
653 -- that's too bad. We only promise that page numbers etc make
654 -- sense if the file is formatted in a standard manner.
656 -- Note: we do not adjust the column number because it is quicker
657 -- to adjust it once at the end of the operation than incrementing
658 -- it each time around the loop.
661 Item (Last) := Character'Val (ch);
663 -- All done if the string is full, this is the case in which
664 -- we do not skip the following line mark. We need to adjust
665 -- the column number in this case.
667 if Last = Item'Last then
668 File.Col := File.Col + Count (Item'Length);
672 -- Otherwise read next character. We also exit from the loop if
673 -- we read an end of file. This is the case where the last line
674 -- is not terminated with a line mark, and we consider that there
675 -- is an implied line mark in this case (this is a non-standard
676 -- file, but it is nice to treat it reasonably).
683 -- We have skipped past, but not stored, a line mark. Skip following
684 -- page mark if one follows, but do not do this for a non-regular
685 -- file (since otherwise we get annoying wait for an extra character)
687 File.Line := File.Line + 1;
690 if File.Before_LM_PM then
692 File.Before_LM_PM := False;
693 File.Page := File.Page + 1;
695 elsif File.Is_Regular_File then
698 if ch = PM and then File.Is_Regular_File then
700 File.Page := File.Page + 1;
712 Get_Line (Current_In, Item, Last);
719 function Getc (File : File_Type) return int is
723 ch := fgetc (File.Stream);
725 if ch = EOF and then ferror (File.Stream) /= 0 then
736 function Is_Open (File : in File_Type) return Boolean is
738 return FIO.Is_Open (AP (File));
745 -- Note: we assume that it is impossible in practice for the line
746 -- to exceed the value of Count'Last, i.e. no check is required for
747 -- overflow raising layout error.
749 function Line (File : in File_Type) return Positive_Count is
751 FIO.Check_File_Open (AP (File));
755 function Line return Positive_Count is
757 return Line (Current_Out);
764 function Line_Length (File : in File_Type) return Count is
766 FIO.Check_Write_Status (AP (File));
767 return File.Line_Length;
770 function Line_Length return Count is
772 return Line_Length (Current_Out);
780 (File : in File_Type;
781 Item : out Character;
782 End_Of_Line : out Boolean)
787 FIO.Check_Read_Status (AP (File));
789 if File.Before_LM then
798 or else (ch = PM and then File.Is_Regular_File)
803 End_Of_Line := False;
804 Item := Character'Val (ch);
810 (Item : out Character;
811 End_Of_Line : out Boolean)
814 Look_Ahead (Current_In, Item, End_Of_Line);
821 function Mode (File : in File_Type) return File_Mode is
823 return To_TIO (FIO.Mode (AP (File)));
830 function Name (File : in File_Type) return String is
832 return FIO.Name (AP (File));
840 (File : in File_Type;
841 Spacing : in Positive_Count := 1)
844 -- Raise Constraint_Error if out of range value. The reason for this
845 -- explicit test is that we don't want junk values around, even if
846 -- checks are off in the caller.
848 if Spacing not in Positive_Count then
849 raise Constraint_Error;
852 FIO.Check_Write_Status (AP (File));
854 for K in 1 .. Spacing loop
856 File.Line := File.Line + 1;
858 if File.Page_Length /= 0
859 and then File.Line > File.Page_Length
863 File.Page := File.Page + 1;
870 procedure New_Line (Spacing : in Positive_Count := 1) is
872 New_Line (Current_Out, Spacing);
879 procedure New_Page (File : in File_Type) is
881 FIO.Check_Write_Status (AP (File));
883 if File.Col /= 1 or else File.Line = 1 then
888 File.Page := File.Page + 1;
893 procedure New_Page is
895 New_Page (Current_Out);
902 function Nextc (File : File_Type) return int is
906 ch := fgetc (File.Stream);
909 if ferror (File.Stream) /= 0 then
914 if ungetc (ch, File.Stream) = EOF then
927 (File : in out File_Type;
930 Form : in String := "")
932 Dummy_File_Control_Block : Text_AFCB;
933 pragma Warnings (Off, Dummy_File_Control_Block);
934 -- Yes, we know this is never assigned a value, only the tag
935 -- is used for dispatching purposes, so that's expected.
938 FIO.Open (File_Ptr => AP (File),
939 Dummy_FCB => Dummy_File_Control_Block,
940 Mode => To_FCB (Mode),
954 -- Note: we assume that it is impossible in practice for the page
955 -- to exceed the value of Count'Last, i.e. no check is required for
956 -- overflow raising layout error.
958 function Page (File : in File_Type) return Positive_Count is
960 FIO.Check_File_Open (AP (File));
964 function Page return Positive_Count is
966 return Page (Current_Out);
973 function Page_Length (File : in File_Type) return Count is
975 FIO.Check_Write_Status (AP (File));
976 return File.Page_Length;
979 function Page_Length return Count is
981 return Page_Length (Current_Out);
989 (File : in File_Type;
993 FIO.Check_Write_Status (AP (File));
995 if File.Line_Length /= 0 and then File.Col > File.Line_Length then
999 if fputc (Character'Pos (Item), File.Stream) = EOF then
1003 File.Col := File.Col + 1;
1006 procedure Put (Item : in Character) is
1008 FIO.Check_Write_Status (AP (Current_Out));
1010 if Current_Out.Line_Length /= 0
1011 and then Current_Out.Col > Current_Out.Line_Length
1013 New_Line (Current_Out);
1016 if fputc (Character'Pos (Item), Current_Out.Stream) = EOF then
1020 Current_Out.Col := Current_Out.Col + 1;
1028 (File : in File_Type;
1032 FIO.Check_Write_Status (AP (File));
1034 if Item'Length > 0 then
1036 -- If we have bounded lines, then do things character by
1037 -- character (this seems a rare case anyway!)
1039 if File.Line_Length /= 0 then
1040 for J in Item'Range loop
1041 Put (File, Item (J));
1044 -- Otherwise we can output the entire string at once. Note that if
1045 -- there are LF or FF characters in the string, we do not bother to
1046 -- count them as line or page terminators.
1049 FIO.Write_Buf (AP (File), Item'Address, Item'Length);
1050 File.Col := File.Col + Item'Length;
1055 procedure Put (Item : in String) is
1057 Put (Current_Out, Item);
1065 (File : in File_Type;
1068 Ilen : Natural := Item'Length;
1069 Istart : Natural := Item'First;
1072 FIO.Check_Write_Status (AP (File));
1074 -- If we have bounded lines, then just do a put and a new line. In
1075 -- this case we will end up doing things character by character in
1076 -- any case, and it is a rare situation.
1078 if File.Line_Length /= 0 then
1084 -- We setup a single string that has the necessary terminators and
1085 -- then write it with a single call. The reason for doing this is
1086 -- that it gives better behavior for the use of Put_Line in multi-
1087 -- tasking programs, since often the OS will treat the entire put
1088 -- operation as an atomic operation.
1090 -- We only do this if the message is 512 characters or less in length,
1091 -- since otherwise Put_Line would use an unbounded amount of stack
1092 -- space and could cause undetected stack overflow. If we have a
1093 -- longer string, then output the first part separately to avoid this.
1096 FIO.Write_Buf (AP (File), Item'Address, size_t (Ilen - 512));
1097 Istart := Istart + Ilen - 512;
1101 -- Now prepare the string with its terminator
1104 Buffer : String (1 .. Ilen + 2);
1108 Buffer (1 .. Ilen) := Item (Istart .. Item'Last);
1109 Buffer (Ilen + 1) := Character'Val (LM);
1111 if File.Page_Length /= 0
1112 and then File.Line > File.Page_Length
1114 Buffer (Ilen + 2) := Character'Val (PM);
1115 Plen := size_t (Ilen) + 2;
1117 File.Page := File.Page + 1;
1120 Plen := size_t (Ilen) + 1;
1121 File.Line := File.Line + 1;
1124 FIO.Write_Buf (AP (File), Buffer'Address, Plen);
1130 procedure Put_Line (Item : in String) is
1132 Put_Line (Current_Out, Item);
1139 procedure Putc (ch : int; File : File_Type) is
1141 if fputc (ch, File.Stream) = EOF then
1150 -- This is the primitive Stream Read routine, used when a Text_IO file
1151 -- is treated directly as a stream using Text_IO.Streams.Stream.
1154 (File : in out Text_AFCB;
1155 Item : out Stream_Element_Array;
1156 Last : out Stream_Element_Offset)
1159 pragma Warnings (Off, Discard_ch);
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;
1470 (File : in File_Type;
1471 Spacing : in Positive_Count := 1)
1476 -- Raise Constraint_Error if out of range value. The reason for this
1477 -- explicit test is that we don't want junk values around, even if
1478 -- checks are off in the caller.
1480 if Spacing not in Positive_Count then
1481 raise Constraint_Error;
1484 FIO.Check_Read_Status (AP (File));
1486 for L in 1 .. Spacing loop
1487 if File.Before_LM then
1488 File.Before_LM := False;
1489 File.Before_LM_PM := False;
1494 -- If at end of file now, then immediately raise End_Error. Note
1495 -- that we can never be positioned between a line mark and a page
1496 -- mark, so if we are at the end of file, we cannot logically be
1497 -- before the implicit page mark that is at the end of the file.
1499 -- For the same reason, we do not need an explicit check for a
1500 -- page mark. If there is a FF in the middle of a line, the file
1501 -- is not in canonical format and we do not care about the page
1502 -- numbers for files other than ones in canonical format.
1508 -- If not at end of file, then loop till we get to an LM or EOF.
1509 -- The latter case happens only in non-canonical files where the
1510 -- last line is not terminated by LM, but we don't want to blow
1511 -- up for such files, so we assume an implicit LM in this case.
1514 exit when ch = LM or ch = EOF;
1519 -- We have got past a line mark, now, for a regular file only,
1520 -- see if a page mark immediately follows this line mark and
1521 -- if so, skip past the page mark as well. We do not do this
1522 -- for non-regular files, since it would cause an undesirable
1523 -- wait for an additional character.
1526 File.Line := File.Line + 1;
1528 if File.Before_LM_PM then
1529 File.Page := File.Page + 1;
1531 File.Before_LM_PM := False;
1533 elsif File.Is_Regular_File then
1536 -- Page mark can be explicit, or implied at the end of the file
1538 if (ch = PM or else ch = EOF)
1539 and then File.Is_Regular_File
1541 File.Page := File.Page + 1;
1551 procedure Skip_Line (Spacing : in Positive_Count := 1) is
1553 Skip_Line (Current_In, Spacing);
1560 procedure Skip_Page (File : in File_Type) is
1564 FIO.Check_Read_Status (AP (File));
1566 -- If at page mark already, just skip it
1568 if File.Before_LM_PM then
1569 File.Before_LM := False;
1570 File.Before_LM_PM := False;
1571 File.Page := File.Page + 1;
1577 -- This is a bit tricky, if we are logically before an LM then
1578 -- it is not an error if we are at an end of file now, since we
1579 -- are not really at it.
1581 if File.Before_LM then
1582 File.Before_LM := False;
1583 File.Before_LM_PM := False;
1586 -- Otherwise we do raise End_Error if we are at the end of file now
1596 -- Now we can just rumble along to the next page mark, or to the
1597 -- end of file, if that comes first. The latter case happens when
1598 -- the page mark is implied at the end of file.
1602 or else (ch = PM and then File.Is_Regular_File);
1606 File.Page := File.Page + 1;
1611 procedure Skip_Page is
1613 Skip_Page (Current_In);
1616 --------------------
1617 -- Standard_Error --
1618 --------------------
1620 function Standard_Error return File_Type is
1622 return Standard_Err;
1625 function Standard_Error return File_Access is
1627 return Standard_Err'Access;
1630 --------------------
1631 -- Standard_Input --
1632 --------------------
1634 function Standard_Input return File_Type is
1639 function Standard_Input return File_Access is
1641 return Standard_In'Access;
1644 ---------------------
1645 -- Standard_Output --
1646 ---------------------
1648 function Standard_Output return File_Type is
1650 return Standard_Out;
1651 end Standard_Output;
1653 function Standard_Output return File_Access is
1655 return Standard_Out'Access;
1656 end Standard_Output;
1658 --------------------
1659 -- Terminate_Line --
1660 --------------------
1662 procedure Terminate_Line (File : File_Type) is
1664 FIO.Check_File_Open (AP (File));
1666 -- For file other than In_File, test for needing to terminate last line
1668 if Mode (File) /= In_File then
1670 -- If not at start of line definition need new line
1672 if File.Col /= 1 then
1675 -- For files other than standard error and standard output, we
1676 -- make sure that an empty file has a single line feed, so that
1677 -- it is properly formatted. We avoid this for the standard files
1678 -- because it is too much of a nuisance to have these odd line
1679 -- feeds when nothing has been written to the file.
1681 elsif (File /= Standard_Err and then File /= Standard_Out)
1682 and then (File.Line = 1 and then File.Page = 1)
1693 procedure Ungetc (ch : int; File : File_Type) is
1696 if ungetc (ch, File.Stream) = EOF then
1706 -- This is the primitive Stream Write routine, used when a Text_IO file
1707 -- is treated directly as a stream using Text_IO.Streams.Stream.
1710 (File : in out Text_AFCB;
1711 Item : in Stream_Element_Array)
1714 function Has_Translated_Characters return Boolean;
1715 -- return True if Item array contains a character which will be
1716 -- translated under the text file mode. There is only one such
1717 -- character under DOS based systems which is character 10.
1719 text_translation_required : Boolean;
1720 pragma Import (C, text_translation_required,
1721 "__gnat_text_translation_required");
1723 Siz : constant size_t := Item'Length;
1725 function Has_Translated_Characters return Boolean is
1727 for K in Item'Range loop
1728 if Item (K) = 10 then
1733 end Has_Translated_Characters;
1735 Needs_Binary_Write : constant Boolean :=
1736 text_translation_required and then Has_Translated_Characters;
1739 if File.Mode = FCB.In_File then
1743 -- Now we do the write. Since this is a text file, it is normally in
1744 -- text mode, but stream data must be written in binary mode, so we
1745 -- temporarily set binary mode for the write, resetting it after. This
1746 -- is done only if needed (i.e. there is some characters in Item which
1747 -- needs to be written using the binary mode).
1748 -- These calls have no effect in a system (like Unix) where there is
1749 -- no distinction between text and binary files.
1751 -- Since the character translation is done at the time the buffer is
1752 -- written (this is true under Windows) we first flush current buffer
1753 -- with text mode if needed.
1755 if Needs_Binary_Write then
1757 if fflush (File.Stream) = -1 then
1761 set_binary_mode (fileno (File.Stream));
1764 if fwrite (Item'Address, 1, Siz, File.Stream) /= Siz then
1768 -- At this point we need to flush the buffer using the binary mode then
1769 -- we reset to text mode.
1771 if Needs_Binary_Write then
1773 if fflush (File.Stream) = -1 then
1777 set_text_mode (fileno (File.Stream));
1781 -- Use "preallocated" strings to avoid calling "new" during the
1782 -- elaboration of the run time. This is needed in the tasking case to
1783 -- avoid calling Task_Lock too early. A filename is expected to end with a
1784 -- null character in the runtime, here the null characters are added just
1785 -- to have a correct filename length.
1787 Err_Name : aliased String := "*stderr" & ASCII.Nul;
1788 In_Name : aliased String := "*stdin" & ASCII.Nul;
1789 Out_Name : aliased String := "*stdout" & ASCII.Nul;
1791 -------------------------------
1792 -- Initialize Standard Files --
1793 -------------------------------
1795 -- Note: the names in these files are bogus, and probably it would be
1796 -- better for these files to have no names, but the ACVC test insist!
1797 -- We use names that are bound to fail in open etc.
1799 Standard_Err.Stream := stderr;
1800 Standard_Err.Name := Err_Name'Access;
1801 Standard_Err.Form := Null_Str'Unrestricted_Access;
1802 Standard_Err.Mode := FCB.Out_File;
1803 Standard_Err.Is_Regular_File := is_regular_file (fileno (stderr)) /= 0;
1804 Standard_Err.Is_Temporary_File := False;
1805 Standard_Err.Is_System_File := True;
1806 Standard_Err.Is_Text_File := True;
1807 Standard_Err.Access_Method := 'T';
1808 Standard_Err.Self := Standard_Err;
1810 Standard_In.Stream := stdin;
1811 Standard_In.Name := In_Name'Access;
1812 Standard_In.Form := Null_Str'Unrestricted_Access;
1813 Standard_In.Mode := FCB.In_File;
1814 Standard_In.Is_Regular_File := is_regular_file (fileno (stdin)) /= 0;
1815 Standard_In.Is_Temporary_File := False;
1816 Standard_In.Is_System_File := True;
1817 Standard_In.Is_Text_File := True;
1818 Standard_In.Access_Method := 'T';
1819 Standard_In.Self := Standard_In;
1821 Standard_Out.Stream := stdout;
1822 Standard_Out.Name := Out_Name'Access;
1823 Standard_Out.Form := Null_Str'Unrestricted_Access;
1824 Standard_Out.Mode := FCB.Out_File;
1825 Standard_Out.Is_Regular_File := is_regular_file (fileno (stdout)) /= 0;
1826 Standard_Out.Is_Temporary_File := False;
1827 Standard_Out.Is_System_File := True;
1828 Standard_Out.Is_Text_File := True;
1829 Standard_Out.Access_Method := 'T';
1830 Standard_Out.Self := Standard_Out;
1832 FIO.Chain_File (AP (Standard_In));
1833 FIO.Chain_File (AP (Standard_Out));
1834 FIO.Chain_File (AP (Standard_Err));
1836 FIO.Make_Unbuffered (AP (Standard_Out));
1837 FIO.Make_Unbuffered (AP (Standard_Err));