| ------------------------------------------------------------------------------ |
| -- -- |
| -- GNAT RUN-TIME COMPONENTS -- |
| -- -- |
| -- A D A . T E X T _ I O -- |
| -- -- |
| -- B o d y -- |
| -- -- |
| -- Copyright (C) 1992-2014, Free Software Foundation, Inc. -- |
| -- -- |
| -- GNAT is free software; you can redistribute it and/or modify it under -- |
| -- terms of the GNU General Public License as published by the Free Soft- -- |
| -- ware Foundation; either version 3, or (at your option) any later ver- -- |
| -- sion. GNAT is distributed in the hope that it will be useful, but WITH- -- |
| -- OUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY -- |
| -- or FITNESS FOR A PARTICULAR PURPOSE. -- |
| -- -- |
| -- As a special exception under Section 7 of GPL version 3, you are granted -- |
| -- additional permissions described in the GCC Runtime Library Exception, -- |
| -- version 3.1, as published by the Free Software Foundation. -- |
| -- -- |
| -- You should have received a copy of the GNU General Public License and -- |
| -- a copy of the GCC Runtime Library Exception along with this program; -- |
| -- see the files COPYING3 and COPYING.RUNTIME respectively. If not, see -- |
| -- <http://www.gnu.org/licenses/>. -- |
| -- -- |
| -- GNAT was originally developed by the GNAT team at New York University. -- |
| -- Extensive contributions were provided by Ada Core Technologies Inc. -- |
| -- -- |
| ------------------------------------------------------------------------------ |
| |
| with Ada.Streams; use Ada.Streams; |
| with Interfaces.C_Streams; use Interfaces.C_Streams; |
| |
| with System.File_IO; |
| with System.CRTL; |
| with System.WCh_Cnv; use System.WCh_Cnv; |
| with System.WCh_Con; use System.WCh_Con; |
| |
| with Ada.Unchecked_Conversion; |
| with Ada.Unchecked_Deallocation; |
| |
| pragma Elaborate_All (System.File_IO); |
| -- Needed because of calls to Chain_File in package body elaboration |
| |
| package body Ada.Text_IO is |
| |
| package FIO renames System.File_IO; |
| |
| subtype AP is FCB.AFCB_Ptr; |
| |
| function To_FCB is new Ada.Unchecked_Conversion (File_Mode, FCB.File_Mode); |
| function To_TIO is new Ada.Unchecked_Conversion (FCB.File_Mode, File_Mode); |
| use type FCB.File_Mode; |
| |
| use type System.CRTL.size_t; |
| |
| WC_Encoding : Character; |
| pragma Import (C, WC_Encoding, "__gl_wc_encoding"); |
| -- Default wide character encoding |
| |
| Err_Name : aliased String := "*stderr" & ASCII.NUL; |
| In_Name : aliased String := "*stdin" & ASCII.NUL; |
| Out_Name : aliased String := "*stdout" & ASCII.NUL; |
| -- Names of standard files |
| -- |
| -- Use "preallocated" strings to avoid calling "new" during the elaboration |
| -- of the run time. This is needed in the tasking case to avoid calling |
| -- Task_Lock too early. A filename is expected to end with a null character |
| -- in the runtime, here the null characters are added just to have a |
| -- correct filename length. |
| -- |
| -- Note: the names for these files are bogus, and probably it would be |
| -- better for these files to have no names, but the ACVC tests insist. |
| -- We use names that are bound to fail in open etc. |
| |
| Null_Str : aliased constant String := ""; |
| -- Used as form string for standard files |
| |
| ----------------------- |
| -- Local Subprograms -- |
| ----------------------- |
| |
| function Get_Upper_Half_Char |
| (C : Character; |
| File : File_Type) return Character; |
| -- This function is shared by Get and Get_Immediate to extract an encoded |
| -- upper half character value from the given File. The first byte has |
| -- already been read and is passed in C. The character value is returned as |
| -- the result, and the file pointer is bumped past the character. |
| -- Constraint_Error is raised if the encoded value is outside the bounds of |
| -- type Character. |
| |
| function Get_Upper_Half_Char_Immed |
| (C : Character; |
| File : File_Type) return Character; |
| -- This routine is identical to Get_Upper_Half_Char, except that the reads |
| -- are done in Get_Immediate mode (i.e. without waiting for a line return). |
| |
| function Getc (File : File_Type) return int; |
| -- Gets next character from file, which has already been checked for being |
| -- in read status, and returns the character read if no error occurs. The |
| -- result is EOF if the end of file was read. |
| |
| function Getc_Immed (File : File_Type) return int; |
| -- This routine is identical to Getc, except that the read is done in |
| -- Get_Immediate mode (i.e. without waiting for a line return). |
| |
| function Has_Upper_Half_Character (Item : String) return Boolean; |
| -- Returns True if any of the characters is in the range 16#80#-16#FF# |
| |
| function Nextc (File : File_Type) return int; |
| -- Returns next character from file without skipping past it (i.e. it is a |
| -- combination of Getc followed by an Ungetc). |
| |
| procedure Put_Encoded (File : File_Type; Char : Character); |
| -- Called to output a character Char to the given File, when the encoding |
| -- method for the file is other than brackets, and Char is upper half. |
| |
| procedure Putc (ch : int; File : File_Type); |
| -- Outputs the given character to the file, which has already been checked |
| -- for being in output status. Device_Error is raised if the character |
| -- cannot be written. |
| |
| procedure Set_WCEM (File : in out File_Type); |
| -- Called by Open and Create to set the wide character encoding method for |
| -- the file, processing a WCEM form parameter if one is present. File is |
| -- IN OUT because it may be closed in case of an error. |
| |
| procedure Terminate_Line (File : File_Type); |
| -- If the file is in Write_File or Append_File mode, and the current line |
| -- is not terminated, then a line terminator is written using New_Line. |
| -- Note that there is no Terminate_Page routine, because the page mark at |
| -- the end of the file is implied if necessary. |
| |
| procedure Ungetc (ch : int; File : File_Type); |
| -- Pushes back character into stream, using ungetc. The caller has checked |
| -- that the file is in read status. Device_Error is raised if the character |
| -- cannot be pushed back. An attempt to push back and end of file character |
| -- (EOF) is ignored. |
| |
| ------------------- |
| -- AFCB_Allocate -- |
| ------------------- |
| |
| function AFCB_Allocate (Control_Block : Text_AFCB) return FCB.AFCB_Ptr is |
| pragma Unreferenced (Control_Block); |
| begin |
| return new Text_AFCB; |
| end AFCB_Allocate; |
| |
| ---------------- |
| -- AFCB_Close -- |
| ---------------- |
| |
| procedure AFCB_Close (File : not null access Text_AFCB) is |
| begin |
| -- If the file being closed is one of the current files, then close |
| -- the corresponding current file. It is not clear that this action |
| -- is required (RM A.10.3(23)) but it seems reasonable, and besides |
| -- ACVC test CE3208A expects this behavior. |
| |
| if File_Type (File) = Current_In then |
| Current_In := null; |
| elsif File_Type (File) = Current_Out then |
| Current_Out := null; |
| elsif File_Type (File) = Current_Err then |
| Current_Err := null; |
| end if; |
| |
| Terminate_Line (File_Type (File)); |
| end AFCB_Close; |
| |
| --------------- |
| -- AFCB_Free -- |
| --------------- |
| |
| procedure AFCB_Free (File : not null access Text_AFCB) is |
| type FCB_Ptr is access all Text_AFCB; |
| FT : FCB_Ptr := FCB_Ptr (File); |
| |
| procedure Free is new Ada.Unchecked_Deallocation (Text_AFCB, FCB_Ptr); |
| |
| begin |
| Free (FT); |
| end AFCB_Free; |
| |
| ----------- |
| -- Close -- |
| ----------- |
| |
| procedure Close (File : in out File_Type) is |
| begin |
| FIO.Close (AP (File)'Unrestricted_Access); |
| end Close; |
| |
| --------- |
| -- Col -- |
| --------- |
| |
| -- Note: we assume that it is impossible in practice for the column |
| -- to exceed the value of Count'Last, i.e. no check is required for |
| -- overflow raising layout error. |
| |
| function Col (File : File_Type) return Positive_Count is |
| begin |
| FIO.Check_File_Open (AP (File)); |
| return File.Col; |
| end Col; |
| |
| function Col return Positive_Count is |
| begin |
| return Col (Current_Out); |
| end Col; |
| |
| ------------ |
| -- Create -- |
| ------------ |
| |
| procedure Create |
| (File : in out File_Type; |
| Mode : File_Mode := Out_File; |
| Name : String := ""; |
| Form : String := "") |
| is |
| Dummy_File_Control_Block : Text_AFCB; |
| pragma Warnings (Off, Dummy_File_Control_Block); |
| -- Yes, we know this is never assigned a value, only the tag |
| -- is used for dispatching purposes, so that's expected. |
| |
| begin |
| FIO.Open (File_Ptr => AP (File), |
| Dummy_FCB => Dummy_File_Control_Block, |
| Mode => To_FCB (Mode), |
| Name => Name, |
| Form => Form, |
| Amethod => 'T', |
| Creat => True, |
| Text => True); |
| |
| File.Self := File; |
| Set_WCEM (File); |
| end Create; |
| |
| ------------------- |
| -- Current_Error -- |
| ------------------- |
| |
| function Current_Error return File_Type is |
| begin |
| return Current_Err; |
| end Current_Error; |
| |
| function Current_Error return File_Access is |
| begin |
| return Current_Err.Self'Access; |
| end Current_Error; |
| |
| ------------------- |
| -- Current_Input -- |
| ------------------- |
| |
| function Current_Input return File_Type is |
| begin |
| return Current_In; |
| end Current_Input; |
| |
| function Current_Input return File_Access is |
| begin |
| return Current_In.Self'Access; |
| end Current_Input; |
| |
| -------------------- |
| -- Current_Output -- |
| -------------------- |
| |
| function Current_Output return File_Type is |
| begin |
| return Current_Out; |
| end Current_Output; |
| |
| function Current_Output return File_Access is |
| begin |
| return Current_Out.Self'Access; |
| end Current_Output; |
| |
| ------------ |
| -- Delete -- |
| ------------ |
| |
| procedure Delete (File : in out File_Type) is |
| begin |
| FIO.Delete (AP (File)'Unrestricted_Access); |
| end Delete; |
| |
| ----------------- |
| -- End_Of_File -- |
| ----------------- |
| |
| function End_Of_File (File : File_Type) return Boolean is |
| ch : int; |
| |
| begin |
| FIO.Check_Read_Status (AP (File)); |
| |
| if File.Before_Upper_Half_Character then |
| return False; |
| |
| elsif File.Before_LM then |
| if File.Before_LM_PM then |
| return Nextc (File) = EOF; |
| end if; |
| |
| else |
| ch := Getc (File); |
| |
| if ch = EOF then |
| return True; |
| |
| elsif ch /= LM then |
| Ungetc (ch, File); |
| return False; |
| |
| else -- ch = LM |
| File.Before_LM := True; |
| end if; |
| end if; |
| |
| -- Here we are just past the line mark with Before_LM set so that we |
| -- do not have to try to back up past the LM, thus avoiding the need |
| -- to back up more than one character. |
| |
| ch := Getc (File); |
| |
| if ch = EOF then |
| return True; |
| |
| elsif ch = PM and then File.Is_Regular_File then |
| File.Before_LM_PM := True; |
| return Nextc (File) = EOF; |
| |
| -- Here if neither EOF nor PM followed end of line |
| |
| else |
| Ungetc (ch, File); |
| return False; |
| end if; |
| |
| end End_Of_File; |
| |
| function End_Of_File return Boolean is |
| begin |
| return End_Of_File (Current_In); |
| end End_Of_File; |
| |
| ----------------- |
| -- End_Of_Line -- |
| ----------------- |
| |
| function End_Of_Line (File : File_Type) return Boolean is |
| ch : int; |
| |
| begin |
| FIO.Check_Read_Status (AP (File)); |
| |
| if File.Before_Upper_Half_Character then |
| return False; |
| |
| elsif File.Before_LM then |
| return True; |
| |
| else |
| ch := Getc (File); |
| |
| if ch = EOF then |
| return True; |
| |
| else |
| Ungetc (ch, File); |
| return (ch = LM); |
| end if; |
| end if; |
| end End_Of_Line; |
| |
| function End_Of_Line return Boolean is |
| begin |
| return End_Of_Line (Current_In); |
| end End_Of_Line; |
| |
| ----------------- |
| -- End_Of_Page -- |
| ----------------- |
| |
| function End_Of_Page (File : File_Type) return Boolean is |
| ch : int; |
| |
| begin |
| FIO.Check_Read_Status (AP (File)); |
| |
| if not File.Is_Regular_File then |
| return False; |
| |
| elsif File.Before_Upper_Half_Character then |
| return False; |
| |
| elsif File.Before_LM then |
| if File.Before_LM_PM then |
| return True; |
| end if; |
| |
| else |
| ch := Getc (File); |
| |
| if ch = EOF then |
| return True; |
| |
| elsif ch /= LM then |
| Ungetc (ch, File); |
| return False; |
| |
| else -- ch = LM |
| File.Before_LM := True; |
| end if; |
| end if; |
| |
| -- Here we are just past the line mark with Before_LM set so that we |
| -- do not have to try to back up past the LM, thus avoiding the need |
| -- to back up more than one character. |
| |
| ch := Nextc (File); |
| |
| return ch = PM or else ch = EOF; |
| end End_Of_Page; |
| |
| function End_Of_Page return Boolean is |
| begin |
| return End_Of_Page (Current_In); |
| end End_Of_Page; |
| |
| -------------- |
| -- EOF_Char -- |
| -------------- |
| |
| function EOF_Char return Integer is |
| begin |
| return EOF; |
| end EOF_Char; |
| |
| ----------- |
| -- Flush -- |
| ----------- |
| |
| procedure Flush (File : File_Type) is |
| begin |
| FIO.Flush (AP (File)); |
| end Flush; |
| |
| procedure Flush is |
| begin |
| Flush (Current_Out); |
| end Flush; |
| |
| ---------- |
| -- Form -- |
| ---------- |
| |
| function Form (File : File_Type) return String is |
| begin |
| return FIO.Form (AP (File)); |
| end Form; |
| |
| --------- |
| -- Get -- |
| --------- |
| |
| procedure Get |
| (File : File_Type; |
| Item : out Character) |
| is |
| ch : int; |
| |
| begin |
| FIO.Check_Read_Status (AP (File)); |
| |
| if File.Before_Upper_Half_Character then |
| File.Before_Upper_Half_Character := False; |
| Item := File.Saved_Upper_Half_Character; |
| |
| elsif File.Before_LM then |
| File.Before_LM := False; |
| File.Col := 1; |
| |
| if File.Before_LM_PM then |
| File.Line := 1; |
| File.Page := File.Page + 1; |
| File.Before_LM_PM := False; |
| else |
| File.Line := File.Line + 1; |
| end if; |
| end if; |
| |
| loop |
| ch := Getc (File); |
| |
| if ch = EOF then |
| raise End_Error; |
| |
| elsif ch = LM then |
| File.Line := File.Line + 1; |
| File.Col := 1; |
| |
| elsif ch = PM and then File.Is_Regular_File then |
| File.Page := File.Page + 1; |
| File.Line := 1; |
| |
| else |
| Item := Character'Val (ch); |
| File.Col := File.Col + 1; |
| return; |
| end if; |
| end loop; |
| end Get; |
| |
| procedure Get (Item : out Character) is |
| begin |
| Get (Current_In, Item); |
| end Get; |
| |
| procedure Get |
| (File : File_Type; |
| Item : out String) |
| is |
| ch : int; |
| J : Natural; |
| |
| begin |
| FIO.Check_Read_Status (AP (File)); |
| |
| if File.Before_LM then |
| File.Before_LM := False; |
| File.Before_LM_PM := False; |
| File.Col := 1; |
| |
| if File.Before_LM_PM then |
| File.Line := 1; |
| File.Page := File.Page + 1; |
| File.Before_LM_PM := False; |
| |
| else |
| File.Line := File.Line + 1; |
| end if; |
| end if; |
| |
| J := Item'First; |
| while J <= Item'Last loop |
| ch := Getc (File); |
| |
| if ch = EOF then |
| raise End_Error; |
| |
| elsif ch = LM then |
| File.Line := File.Line + 1; |
| File.Col := 1; |
| |
| elsif ch = PM and then File.Is_Regular_File then |
| File.Page := File.Page + 1; |
| File.Line := 1; |
| |
| else |
| Item (J) := Character'Val (ch); |
| J := J + 1; |
| File.Col := File.Col + 1; |
| end if; |
| end loop; |
| end Get; |
| |
| procedure Get (Item : out String) is |
| begin |
| Get (Current_In, Item); |
| end Get; |
| |
| ------------------- |
| -- Get_Immediate -- |
| ------------------- |
| |
| procedure Get_Immediate |
| (File : File_Type; |
| Item : out Character) |
| is |
| ch : int; |
| |
| begin |
| FIO.Check_Read_Status (AP (File)); |
| |
| if File.Before_Upper_Half_Character then |
| File.Before_Upper_Half_Character := False; |
| Item := File.Saved_Upper_Half_Character; |
| |
| elsif File.Before_LM then |
| File.Before_LM := False; |
| File.Before_LM_PM := False; |
| Item := Character'Val (LM); |
| |
| else |
| ch := Getc_Immed (File); |
| |
| if ch = EOF then |
| raise End_Error; |
| else |
| Item := |
| (if not Is_Start_Of_Encoding (Character'Val (ch), File.WC_Method) |
| then Character'Val (ch) |
| else Get_Upper_Half_Char_Immed (Character'Val (ch), File)); |
| end if; |
| end if; |
| end Get_Immediate; |
| |
| procedure Get_Immediate |
| (Item : out Character) |
| is |
| begin |
| Get_Immediate (Current_In, Item); |
| end Get_Immediate; |
| |
| procedure Get_Immediate |
| (File : File_Type; |
| Item : out Character; |
| Available : out Boolean) |
| is |
| ch : int; |
| end_of_file : int; |
| avail : int; |
| |
| procedure getc_immediate_nowait |
| (stream : FILEs; |
| ch : out int; |
| end_of_file : out int; |
| avail : out int); |
| pragma Import (C, getc_immediate_nowait, "getc_immediate_nowait"); |
| |
| begin |
| FIO.Check_Read_Status (AP (File)); |
| Available := True; |
| |
| if File.Before_Upper_Half_Character then |
| File.Before_Upper_Half_Character := False; |
| Item := File.Saved_Upper_Half_Character; |
| |
| elsif File.Before_LM then |
| File.Before_LM := False; |
| File.Before_LM_PM := False; |
| Item := Character'Val (LM); |
| |
| else |
| getc_immediate_nowait (File.Stream, ch, end_of_file, avail); |
| |
| if ferror (File.Stream) /= 0 then |
| raise Device_Error; |
| |
| elsif end_of_file /= 0 then |
| raise End_Error; |
| |
| elsif avail = 0 then |
| Available := False; |
| Item := ASCII.NUL; |
| |
| else |
| Available := True; |
| |
| Item := |
| (if not Is_Start_Of_Encoding (Character'Val (ch), File.WC_Method) |
| then Character'Val (ch) |
| else Get_Upper_Half_Char_Immed (Character'Val (ch), File)); |
| end if; |
| end if; |
| |
| end Get_Immediate; |
| |
| procedure Get_Immediate |
| (Item : out Character; |
| Available : out Boolean) |
| is |
| begin |
| Get_Immediate (Current_In, Item, Available); |
| end Get_Immediate; |
| |
| -------------- |
| -- Get_Line -- |
| -------------- |
| |
| procedure Get_Line |
| (File : File_Type; |
| Item : out String; |
| Last : out Natural) is separate; |
| -- The implementation of Ada.Text_IO.Get_Line is split into a subunit so |
| -- that different implementations can be used on different systems. In |
| -- particular the standard implementation uses low level stuff that is |
| -- not appropriate for the JVM and .NET implementations. |
| |
| procedure Get_Line |
| (Item : out String; |
| Last : out Natural) |
| is |
| begin |
| Get_Line (Current_In, Item, Last); |
| end Get_Line; |
| |
| function Get_Line (File : File_Type) return String is |
| Buffer : String (1 .. 500); |
| Last : Natural; |
| |
| function Get_Rest (S : String) return String; |
| -- This is a recursive function that reads the rest of the line and |
| -- returns it. S is the part read so far. |
| |
| -------------- |
| -- Get_Rest -- |
| -------------- |
| |
| function Get_Rest (S : String) return String is |
| |
| -- Each time we allocate a buffer the same size as what we have |
| -- read so far. This limits us to a logarithmic number of calls |
| -- to Get_Rest and also ensures only a linear use of stack space. |
| |
| Buffer : String (1 .. S'Length); |
| Last : Natural; |
| |
| begin |
| Get_Line (File, Buffer, Last); |
| |
| declare |
| R : constant String := S & Buffer (1 .. Last); |
| begin |
| if Last < Buffer'Last then |
| return R; |
| else |
| return Get_Rest (R); |
| end if; |
| end; |
| end Get_Rest; |
| |
| -- Start of processing for Get_Line |
| |
| begin |
| Get_Line (File, Buffer, Last); |
| |
| if Last < Buffer'Last then |
| return Buffer (1 .. Last); |
| else |
| return Get_Rest (Buffer (1 .. Last)); |
| end if; |
| end Get_Line; |
| |
| function Get_Line return String is |
| begin |
| return Get_Line (Current_In); |
| end Get_Line; |
| |
| ------------------------- |
| -- Get_Upper_Half_Char -- |
| ------------------------- |
| |
| function Get_Upper_Half_Char |
| (C : Character; |
| File : File_Type) return Character |
| is |
| Result : Wide_Character; |
| |
| function In_Char return Character; |
| -- Function used to obtain additional characters it the wide character |
| -- sequence is more than one character long. |
| |
| function WC_In is new Char_Sequence_To_Wide_Char (In_Char); |
| |
| ------------- |
| -- In_Char -- |
| ------------- |
| |
| function In_Char return Character is |
| ch : constant Integer := Getc (File); |
| begin |
| if ch = EOF then |
| raise End_Error; |
| else |
| return Character'Val (ch); |
| end if; |
| end In_Char; |
| |
| -- Start of processing for Get_Upper_Half_Char |
| |
| begin |
| Result := WC_In (C, File.WC_Method); |
| |
| if Wide_Character'Pos (Result) > 16#FF# then |
| raise Constraint_Error with |
| "invalid wide character in Text_'I'O input"; |
| else |
| return Character'Val (Wide_Character'Pos (Result)); |
| end if; |
| end Get_Upper_Half_Char; |
| |
| ------------------------------- |
| -- Get_Upper_Half_Char_Immed -- |
| ------------------------------- |
| |
| function Get_Upper_Half_Char_Immed |
| (C : Character; |
| File : File_Type) return Character |
| is |
| Result : Wide_Character; |
| |
| function In_Char return Character; |
| -- Function used to obtain additional characters it the wide character |
| -- sequence is more than one character long. |
| |
| function WC_In is new Char_Sequence_To_Wide_Char (In_Char); |
| |
| ------------- |
| -- In_Char -- |
| ------------- |
| |
| function In_Char return Character is |
| ch : constant Integer := Getc_Immed (File); |
| begin |
| if ch = EOF then |
| raise End_Error; |
| else |
| return Character'Val (ch); |
| end if; |
| end In_Char; |
| |
| -- Start of processing for Get_Upper_Half_Char_Immed |
| |
| begin |
| Result := WC_In (C, File.WC_Method); |
| |
| if Wide_Character'Pos (Result) > 16#FF# then |
| raise Constraint_Error with |
| "invalid wide character in Text_'I'O input"; |
| else |
| return Character'Val (Wide_Character'Pos (Result)); |
| end if; |
| end Get_Upper_Half_Char_Immed; |
| |
| ---------- |
| -- Getc -- |
| ---------- |
| |
| function Getc (File : File_Type) return int is |
| ch : int; |
| |
| begin |
| ch := fgetc (File.Stream); |
| |
| if ch = EOF and then ferror (File.Stream) /= 0 then |
| raise Device_Error; |
| else |
| return ch; |
| end if; |
| end Getc; |
| |
| ---------------- |
| -- Getc_Immed -- |
| ---------------- |
| |
| function Getc_Immed (File : File_Type) return int is |
| ch : int; |
| end_of_file : int; |
| |
| procedure getc_immediate |
| (stream : FILEs; ch : out int; end_of_file : out int); |
| pragma Import (C, getc_immediate, "getc_immediate"); |
| |
| begin |
| FIO.Check_Read_Status (AP (File)); |
| |
| if File.Before_LM then |
| File.Before_LM := False; |
| File.Before_LM_PM := False; |
| ch := LM; |
| |
| else |
| getc_immediate (File.Stream, ch, end_of_file); |
| |
| if ferror (File.Stream) /= 0 then |
| raise Device_Error; |
| elsif end_of_file /= 0 then |
| return EOF; |
| end if; |
| end if; |
| |
| return ch; |
| end Getc_Immed; |
| |
| ------------------------------ |
| -- Has_Upper_Half_Character -- |
| ------------------------------ |
| |
| function Has_Upper_Half_Character (Item : String) return Boolean is |
| begin |
| for J in Item'Range loop |
| if Character'Pos (Item (J)) >= 16#80# then |
| return True; |
| end if; |
| end loop; |
| |
| return False; |
| end Has_Upper_Half_Character; |
| |
| ------------------------------- |
| -- Initialize_Standard_Files -- |
| ------------------------------- |
| |
| procedure Initialize_Standard_Files is |
| begin |
| Standard_Err.Stream := stderr; |
| Standard_Err.Name := Err_Name'Access; |
| Standard_Err.Form := Null_Str'Unrestricted_Access; |
| Standard_Err.Mode := FCB.Out_File; |
| Standard_Err.Is_Regular_File := is_regular_file (fileno (stderr)) /= 0; |
| Standard_Err.Is_Temporary_File := False; |
| Standard_Err.Is_System_File := True; |
| Standard_Err.Text_Encoding := Default_Text; |
| Standard_Err.Access_Method := 'T'; |
| Standard_Err.Self := Standard_Err; |
| Standard_Err.WC_Method := Default_WCEM; |
| |
| Standard_In.Stream := stdin; |
| Standard_In.Name := In_Name'Access; |
| Standard_In.Form := Null_Str'Unrestricted_Access; |
| Standard_In.Mode := FCB.In_File; |
| Standard_In.Is_Regular_File := is_regular_file (fileno (stdin)) /= 0; |
| Standard_In.Is_Temporary_File := False; |
| Standard_In.Is_System_File := True; |
| Standard_In.Text_Encoding := Default_Text; |
| Standard_In.Access_Method := 'T'; |
| Standard_In.Self := Standard_In; |
| Standard_In.WC_Method := Default_WCEM; |
| |
| Standard_Out.Stream := stdout; |
| Standard_Out.Name := Out_Name'Access; |
| Standard_Out.Form := Null_Str'Unrestricted_Access; |
| Standard_Out.Mode := FCB.Out_File; |
| Standard_Out.Is_Regular_File := is_regular_file (fileno (stdout)) /= 0; |
| Standard_Out.Is_Temporary_File := False; |
| Standard_Out.Is_System_File := True; |
| Standard_Out.Text_Encoding := Default_Text; |
| Standard_Out.Access_Method := 'T'; |
| Standard_Out.Self := Standard_Out; |
| Standard_Out.WC_Method := Default_WCEM; |
| |
| FIO.Make_Unbuffered (AP (Standard_Out)); |
| FIO.Make_Unbuffered (AP (Standard_Err)); |
| end Initialize_Standard_Files; |
| |
| ------------- |
| -- Is_Open -- |
| ------------- |
| |
| function Is_Open (File : File_Type) return Boolean is |
| begin |
| return FIO.Is_Open (AP (File)); |
| end Is_Open; |
| |
| ---------- |
| -- Line -- |
| ---------- |
| |
| -- Note: we assume that it is impossible in practice for the line |
| -- to exceed the value of Count'Last, i.e. no check is required for |
| -- overflow raising layout error. |
| |
| function Line (File : File_Type) return Positive_Count is |
| begin |
| FIO.Check_File_Open (AP (File)); |
| return File.Line; |
| end Line; |
| |
| function Line return Positive_Count is |
| begin |
| return Line (Current_Out); |
| end Line; |
| |
| ----------------- |
| -- Line_Length -- |
| ----------------- |
| |
| function Line_Length (File : File_Type) return Count is |
| begin |
| FIO.Check_Write_Status (AP (File)); |
| return File.Line_Length; |
| end Line_Length; |
| |
| function Line_Length return Count is |
| begin |
| return Line_Length (Current_Out); |
| end Line_Length; |
| |
| ---------------- |
| -- Look_Ahead -- |
| ---------------- |
| |
| procedure Look_Ahead |
| (File : File_Type; |
| Item : out Character; |
| End_Of_Line : out Boolean) |
| is |
| ch : int; |
| |
| begin |
| FIO.Check_Read_Status (AP (File)); |
| |
| -- If we are logically before a line mark, we can return immediately |
| |
| if File.Before_LM then |
| End_Of_Line := True; |
| Item := ASCII.NUL; |
| |
| -- If we are before an upper half character just return it (this can |
| -- happen if there are two calls to Look_Ahead in a row). |
| |
| elsif File.Before_Upper_Half_Character then |
| End_Of_Line := False; |
| Item := File.Saved_Upper_Half_Character; |
| |
| -- Otherwise we must read a character from the input stream |
| |
| else |
| ch := Getc (File); |
| |
| if ch = LM |
| or else ch = EOF |
| or else (ch = PM and then File.Is_Regular_File) |
| then |
| End_Of_Line := True; |
| Ungetc (ch, File); |
| Item := ASCII.NUL; |
| |
| -- Case where character obtained does not represent the start of an |
| -- encoded sequence so it stands for itself and we can unget it with |
| -- no difficulty. |
| |
| elsif not Is_Start_Of_Encoding |
| (Character'Val (ch), File.WC_Method) |
| then |
| End_Of_Line := False; |
| Ungetc (ch, File); |
| Item := Character'Val (ch); |
| |
| -- For the start of an encoding, we read the character using the |
| -- Get_Upper_Half_Char routine. It will occupy more than one byte |
| -- so we can't put it back with ungetc. Instead we save it in the |
| -- control block, setting a flag that everyone interested in reading |
| -- characters must test before reading the stream. |
| |
| else |
| Item := Get_Upper_Half_Char (Character'Val (ch), File); |
| End_Of_Line := False; |
| File.Saved_Upper_Half_Character := Item; |
| File.Before_Upper_Half_Character := True; |
| end if; |
| end if; |
| end Look_Ahead; |
| |
| procedure Look_Ahead |
| (Item : out Character; |
| End_Of_Line : out Boolean) |
| is |
| begin |
| Look_Ahead (Current_In, Item, End_Of_Line); |
| end Look_Ahead; |
| |
| ---------- |
| -- Mode -- |
| ---------- |
| |
| function Mode (File : File_Type) return File_Mode is |
| begin |
| return To_TIO (FIO.Mode (AP (File))); |
| end Mode; |
| |
| ---------- |
| -- Name -- |
| ---------- |
| |
| function Name (File : File_Type) return String is |
| begin |
| return FIO.Name (AP (File)); |
| end Name; |
| |
| -------------- |
| -- New_Line -- |
| -------------- |
| |
| procedure New_Line |
| (File : File_Type; |
| Spacing : Positive_Count := 1) |
| is |
| begin |
| -- Raise Constraint_Error if out of range value. The reason for this |
| -- explicit test is that we don't want junk values around, even if |
| -- checks are off in the caller. |
| |
| if not Spacing'Valid then |
| raise Constraint_Error; |
| end if; |
| |
| FIO.Check_Write_Status (AP (File)); |
| |
| for K in 1 .. Spacing loop |
| Putc (LM, File); |
| File.Line := File.Line + 1; |
| |
| if File.Page_Length /= 0 |
| and then File.Line > File.Page_Length |
| then |
| Putc (PM, File); |
| File.Line := 1; |
| File.Page := File.Page + 1; |
| end if; |
| end loop; |
| |
| File.Col := 1; |
| end New_Line; |
| |
| procedure New_Line (Spacing : Positive_Count := 1) is |
| begin |
| New_Line (Current_Out, Spacing); |
| end New_Line; |
| |
| -------------- |
| -- New_Page -- |
| -------------- |
| |
| procedure New_Page (File : File_Type) is |
| begin |
| FIO.Check_Write_Status (AP (File)); |
| |
| if File.Col /= 1 or else File.Line = 1 then |
| Putc (LM, File); |
| end if; |
| |
| Putc (PM, File); |
| File.Page := File.Page + 1; |
| File.Line := 1; |
| File.Col := 1; |
| end New_Page; |
| |
| procedure New_Page is |
| begin |
| New_Page (Current_Out); |
| end New_Page; |
| |
| ----------- |
| -- Nextc -- |
| ----------- |
| |
| function Nextc (File : File_Type) return int is |
| ch : int; |
| |
| begin |
| ch := fgetc (File.Stream); |
| |
| if ch = EOF then |
| if ferror (File.Stream) /= 0 then |
| raise Device_Error; |
| end if; |
| |
| else |
| if ungetc (ch, File.Stream) = EOF then |
| raise Device_Error; |
| end if; |
| end if; |
| |
| return ch; |
| end Nextc; |
| |
| ---------- |
| -- Open -- |
| ---------- |
| |
| procedure Open |
| (File : in out File_Type; |
| Mode : File_Mode; |
| Name : String; |
| Form : String := "") |
| is |
| Dummy_File_Control_Block : Text_AFCB; |
| pragma Warnings (Off, Dummy_File_Control_Block); |
| -- Yes, we know this is never assigned a value, only the tag |
| -- is used for dispatching purposes, so that's expected. |
| |
| begin |
| FIO.Open (File_Ptr => AP (File), |
| Dummy_FCB => Dummy_File_Control_Block, |
| Mode => To_FCB (Mode), |
| Name => Name, |
| Form => Form, |
| Amethod => 'T', |
| Creat => False, |
| Text => True); |
| |
| File.Self := File; |
| Set_WCEM (File); |
| end Open; |
| |
| ---------- |
| -- Page -- |
| ---------- |
| |
| -- Note: we assume that it is impossible in practice for the page |
| -- to exceed the value of Count'Last, i.e. no check is required for |
| -- overflow raising layout error. |
| |
| function Page (File : File_Type) return Positive_Count is |
| begin |
| FIO.Check_File_Open (AP (File)); |
| return File.Page; |
| end Page; |
| |
| function Page return Positive_Count is |
| begin |
| return Page (Current_Out); |
| end Page; |
| |
| ----------------- |
| -- Page_Length -- |
| ----------------- |
| |
| function Page_Length (File : File_Type) return Count is |
| begin |
| FIO.Check_Write_Status (AP (File)); |
| return File.Page_Length; |
| end Page_Length; |
| |
| function Page_Length return Count is |
| begin |
| return Page_Length (Current_Out); |
| end Page_Length; |
| |
| --------- |
| -- Put -- |
| --------- |
| |
| procedure Put |
| (File : File_Type; |
| Item : Character) |
| is |
| begin |
| FIO.Check_Write_Status (AP (File)); |
| |
| if File.Line_Length /= 0 and then File.Col > File.Line_Length then |
| New_Line (File); |
| end if; |
| |
| -- If lower half character, or brackets encoding, output directly |
| |
| if Character'Pos (Item) < 16#80# |
| or else File.WC_Method = WCEM_Brackets |
| then |
| if fputc (Character'Pos (Item), File.Stream) = EOF then |
| raise Device_Error; |
| end if; |
| |
| -- Case of upper half character with non-brackets encoding |
| |
| else |
| Put_Encoded (File, Item); |
| end if; |
| |
| File.Col := File.Col + 1; |
| end Put; |
| |
| procedure Put (Item : Character) is |
| begin |
| Put (Current_Out, Item); |
| end Put; |
| |
| --------- |
| -- Put -- |
| --------- |
| |
| procedure Put |
| (File : File_Type; |
| Item : String) |
| is |
| begin |
| FIO.Check_Write_Status (AP (File)); |
| |
| -- Only have something to do if string is non-null |
| |
| if Item'Length > 0 then |
| |
| -- If we have bounded lines, or if the file encoding is other than |
| -- Brackets and the string has at least one upper half character, |
| -- then output the string character by character. |
| |
| if File.Line_Length /= 0 |
| or else (File.WC_Method /= WCEM_Brackets |
| and then Has_Upper_Half_Character (Item)) |
| then |
| for J in Item'Range loop |
| Put (File, Item (J)); |
| end loop; |
| |
| -- Otherwise we can output the entire string at once. Note that if |
| -- there are LF or FF characters in the string, we do not bother to |
| -- count them as line or page terminators. |
| |
| else |
| FIO.Write_Buf (AP (File), Item'Address, Item'Length); |
| File.Col := File.Col + Item'Length; |
| end if; |
| end if; |
| end Put; |
| |
| procedure Put (Item : String) is |
| begin |
| Put (Current_Out, Item); |
| end Put; |
| |
| ----------------- |
| -- Put_Encoded -- |
| ----------------- |
| |
| procedure Put_Encoded (File : File_Type; Char : Character) is |
| procedure Out_Char (C : Character); |
| -- Procedure to output one character of an upper half encoded sequence |
| |
| procedure WC_Out is new Wide_Char_To_Char_Sequence (Out_Char); |
| |
| -------------- |
| -- Out_Char -- |
| -------------- |
| |
| procedure Out_Char (C : Character) is |
| begin |
| Putc (Character'Pos (C), File); |
| end Out_Char; |
| |
| -- Start of processing for Put_Encoded |
| |
| begin |
| WC_Out (Wide_Character'Val (Character'Pos (Char)), File.WC_Method); |
| end Put_Encoded; |
| |
| -------------- |
| -- Put_Line -- |
| -------------- |
| |
| procedure Put_Line |
| (File : File_Type; |
| Item : String) |
| is |
| Ilen : Natural := Item'Length; |
| Istart : Natural := Item'First; |
| |
| begin |
| FIO.Check_Write_Status (AP (File)); |
| |
| -- If we have bounded lines, or if the file encoding is other than |
| -- Brackets and the string has at least one upper half character, then |
| -- output the string character by character. |
| |
| if File.Line_Length /= 0 |
| or else (File.WC_Method /= WCEM_Brackets |
| and then Has_Upper_Half_Character (Item)) |
| then |
| for J in Item'Range loop |
| Put (File, Item (J)); |
| end loop; |
| |
| New_Line (File); |
| return; |
| end if; |
| |
| -- Normal case where we do not need to output character by character |
| |
| -- We setup a single string that has the necessary terminators and |
| -- then write it with a single call. The reason for doing this is |
| -- that it gives better behavior for the use of Put_Line in multi- |
| -- tasking programs, since often the OS will treat the entire put |
| -- operation as an atomic operation. |
| |
| -- We only do this if the message is 512 characters or less in length, |
| -- since otherwise Put_Line would use an unbounded amount of stack |
| -- space and could cause undetected stack overflow. If we have a |
| -- longer string, then output the first part separately to avoid this. |
| |
| if Ilen > 512 then |
| FIO.Write_Buf (AP (File), Item'Address, size_t (Ilen - 512)); |
| Istart := Istart + Ilen - 512; |
| Ilen := 512; |
| end if; |
| |
| -- Now prepare the string with its terminator |
| |
| declare |
| Buffer : String (1 .. Ilen + 2); |
| Plen : size_t; |
| |
| begin |
| Buffer (1 .. Ilen) := Item (Istart .. Item'Last); |
| Buffer (Ilen + 1) := Character'Val (LM); |
| |
| if File.Page_Length /= 0 |
| and then File.Line > File.Page_Length |
| then |
| Buffer (Ilen + 2) := Character'Val (PM); |
| Plen := size_t (Ilen) + 2; |
| File.Line := 1; |
| File.Page := File.Page + 1; |
| |
| else |
| Plen := size_t (Ilen) + 1; |
| File.Line := File.Line + 1; |
| end if; |
| |
| FIO.Write_Buf (AP (File), Buffer'Address, Plen); |
| |
| File.Col := 1; |
| end; |
| end Put_Line; |
| |
| procedure Put_Line (Item : String) is |
| begin |
| Put_Line (Current_Out, Item); |
| end Put_Line; |
| |
| ---------- |
| -- Putc -- |
| ---------- |
| |
| procedure Putc (ch : int; File : File_Type) is |
| begin |
| if fputc (ch, File.Stream) = EOF then |
| raise Device_Error; |
| end if; |
| end Putc; |
| |
| ---------- |
| -- Read -- |
| ---------- |
| |
| -- This is the primitive Stream Read routine, used when a Text_IO file |
| -- is treated directly as a stream using Text_IO.Streams.Stream. |
| |
| procedure Read |
| (File : in out Text_AFCB; |
| Item : out Stream_Element_Array; |
| Last : out Stream_Element_Offset) |
| is |
| Discard_ch : int; |
| pragma Warnings (Off, Discard_ch); |
| |
| begin |
| -- Need to deal with Before_Upper_Half_Character ??? |
| |
| if File.Mode /= FCB.In_File then |
| raise Mode_Error; |
| end if; |
| |
| -- Deal with case where our logical and physical position do not match |
| -- because of being after an LM or LM-PM sequence when in fact we are |
| -- logically positioned before it. |
| |
| if File.Before_LM then |
| |
| -- If we are before a PM, then it is possible for a stream read |
| -- to leave us after the LM and before the PM, which is a bit |
| -- odd. The easiest way to deal with this is to unget the PM, |
| -- so we are indeed positioned between the characters. This way |
| -- further stream read operations will work correctly, and the |
| -- effect on text processing is a little weird, but what can |
| -- be expected if stream and text input are mixed this way? |
| |
| if File.Before_LM_PM then |
| Discard_ch := ungetc (PM, File.Stream); |
| File.Before_LM_PM := False; |
| end if; |
| |
| File.Before_LM := False; |
| |
| Item (Item'First) := Stream_Element (Character'Pos (ASCII.LF)); |
| |
| if Item'Length = 1 then |
| Last := Item'Last; |
| |
| else |
| Last := |
| Item'First + |
| Stream_Element_Offset |
| (fread (buffer => Item'Address, |
| index => size_t (Item'First + 1), |
| size => 1, |
| count => Item'Length - 1, |
| stream => File.Stream)); |
| end if; |
| |
| return; |
| end if; |
| |
| -- Now we do the read. Since this is a text file, it is normally in |
| -- text mode, but stream data must be read in binary mode, so we |
| -- temporarily set binary mode for the read, resetting it after. |
| -- These calls have no effect in a system (like Unix) where there is |
| -- no distinction between text and binary files. |
| |
| set_binary_mode (fileno (File.Stream)); |
| |
| Last := |
| Item'First + |
| Stream_Element_Offset |
| (fread (Item'Address, 1, Item'Length, File.Stream)) - 1; |
| |
| if Last < Item'Last then |
| if ferror (File.Stream) /= 0 then |
| raise Device_Error; |
| end if; |
| end if; |
| |
| set_text_mode (fileno (File.Stream)); |
| end Read; |
| |
| ----------- |
| -- Reset -- |
| ----------- |
| |
| procedure Reset |
| (File : in out File_Type; |
| Mode : File_Mode) |
| is |
| begin |
| -- Don't allow change of mode for current file (RM A.10.2(5)) |
| |
| if (File = Current_In or else |
| File = Current_Out or else |
| File = Current_Error) |
| and then To_FCB (Mode) /= File.Mode |
| then |
| raise Mode_Error; |
| end if; |
| |
| Terminate_Line (File); |
| FIO.Reset (AP (File)'Unrestricted_Access, To_FCB (Mode)); |
| File.Page := 1; |
| File.Line := 1; |
| File.Col := 1; |
| File.Line_Length := 0; |
| File.Page_Length := 0; |
| File.Before_LM := False; |
| File.Before_LM_PM := False; |
| end Reset; |
| |
| procedure Reset (File : in out File_Type) is |
| begin |
| Terminate_Line (File); |
| FIO.Reset (AP (File)'Unrestricted_Access); |
| File.Page := 1; |
| File.Line := 1; |
| File.Col := 1; |
| File.Line_Length := 0; |
| File.Page_Length := 0; |
| File.Before_LM := False; |
| File.Before_LM_PM := False; |
| end Reset; |
| |
| ------------- |
| -- Set_Col -- |
| ------------- |
| |
| procedure Set_Col |
| (File : File_Type; |
| To : Positive_Count) |
| is |
| ch : int; |
| |
| begin |
| -- Raise Constraint_Error if out of range value. The reason for this |
| -- explicit test is that we don't want junk values around, even if |
| -- checks are off in the caller. |
| |
| if not To'Valid then |
| raise Constraint_Error; |
| end if; |
| |
| FIO.Check_File_Open (AP (File)); |
| |
| -- Output case |
| |
| if Mode (File) >= Out_File then |
| |
| -- Error if we attempt to set Col to a value greater than the |
| -- maximum permissible line length. |
| |
| if File.Line_Length /= 0 and then To > File.Line_Length then |
| raise Layout_Error; |
| end if; |
| |
| -- If we are behind current position, then go to start of new line |
| |
| if To < File.Col then |
| New_Line (File); |
| end if; |
| |
| -- Loop to output blanks till we are at the required column |
| |
| while File.Col < To loop |
| Put (File, ' '); |
| end loop; |
| |
| -- Input case |
| |
| else |
| -- If we are logically before a LM, but physically after it, the |
| -- file position still reflects the position before the LM, so eat |
| -- it now and adjust the file position appropriately. |
| |
| if File.Before_LM then |
| File.Before_LM := False; |
| File.Before_LM_PM := False; |
| File.Line := File.Line + 1; |
| File.Col := 1; |
| end if; |
| |
| -- Loop reading characters till we get one at the required Col value |
| |
| loop |
| -- Read next character. The reason we have to read ahead is to |
| -- skip formatting characters, the effect of Set_Col is to set |
| -- us to a real character with the right Col value, and format |
| -- characters don't count. |
| |
| ch := Getc (File); |
| |
| -- Error if we hit an end of file |
| |
| if ch = EOF then |
| raise End_Error; |
| |
| -- If line mark, eat it and adjust file position |
| |
| elsif ch = LM then |
| File.Line := File.Line + 1; |
| File.Col := 1; |
| |
| -- If recognized page mark, eat it, and adjust file position |
| |
| elsif ch = PM and then File.Is_Regular_File then |
| File.Page := File.Page + 1; |
| File.Line := 1; |
| File.Col := 1; |
| |
| -- Otherwise this is the character we are looking for, so put it |
| -- back in the input stream (we have not adjusted the file |
| -- position yet, so everything is set right after this ungetc). |
| |
| elsif To = File.Col then |
| Ungetc (ch, File); |
| return; |
| |
| -- Keep skipping characters if we are not there yet, updating the |
| -- file position past the skipped character. |
| |
| else |
| File.Col := File.Col + 1; |
| end if; |
| end loop; |
| end if; |
| end Set_Col; |
| |
| procedure Set_Col (To : Positive_Count) is |
| begin |
| Set_Col (Current_Out, To); |
| end Set_Col; |
| |
| --------------- |
| -- Set_Error -- |
| --------------- |
| |
| procedure Set_Error (File : File_Type) is |
| begin |
| FIO.Check_Write_Status (AP (File)); |
| Current_Err := File; |
| end Set_Error; |
| |
| --------------- |
| -- Set_Input -- |
| --------------- |
| |
| procedure Set_Input (File : File_Type) is |
| begin |
| FIO.Check_Read_Status (AP (File)); |
| Current_In := File; |
| end Set_Input; |
| |
| -------------- |
| -- Set_Line -- |
| -------------- |
| |
| procedure Set_Line |
| (File : File_Type; |
| To : Positive_Count) |
| is |
| begin |
| -- Raise Constraint_Error if out of range value. The reason for this |
| -- explicit test is that we don't want junk values around, even if |
| -- checks are off in the caller. |
| |
| if not To'Valid then |
| raise Constraint_Error; |
| end if; |
| |
| FIO.Check_File_Open (AP (File)); |
| |
| if To = File.Line then |
| return; |
| end if; |
| |
| if Mode (File) >= Out_File then |
| if File.Page_Length /= 0 and then To > File.Page_Length then |
| raise Layout_Error; |
| end if; |
| |
| if To < File.Line then |
| New_Page (File); |
| end if; |
| |
| while File.Line < To loop |
| New_Line (File); |
| end loop; |
| |
| else |
| while To /= File.Line loop |
| Skip_Line (File); |
| end loop; |
| end if; |
| end Set_Line; |
| |
| procedure Set_Line (To : Positive_Count) is |
| begin |
| Set_Line (Current_Out, To); |
| end Set_Line; |
| |
| --------------------- |
| -- Set_Line_Length -- |
| --------------------- |
| |
| procedure Set_Line_Length (File : File_Type; To : Count) is |
| begin |
| -- Raise Constraint_Error if out of range value. The reason for this |
| -- explicit test is that we don't want junk values around, even if |
| -- checks are off in the caller. |
| |
| if not To'Valid then |
| raise Constraint_Error; |
| end if; |
| |
| FIO.Check_Write_Status (AP (File)); |
| File.Line_Length := To; |
| end Set_Line_Length; |
| |
| procedure Set_Line_Length (To : Count) is |
| begin |
| Set_Line_Length (Current_Out, To); |
| end Set_Line_Length; |
| |
| ---------------- |
| -- Set_Output -- |
| ---------------- |
| |
| procedure Set_Output (File : File_Type) is |
| begin |
| FIO.Check_Write_Status (AP (File)); |
| Current_Out := File; |
| end Set_Output; |
| |
| --------------------- |
| -- Set_Page_Length -- |
| --------------------- |
| |
| procedure Set_Page_Length (File : File_Type; To : Count) is |
| begin |
| -- Raise Constraint_Error if out of range value. The reason for this |
| -- explicit test is that we don't want junk values around, even if |
| -- checks are off in the caller. |
| |
| if not To'Valid then |
| raise Constraint_Error; |
| end if; |
| |
| FIO.Check_Write_Status (AP (File)); |
| File.Page_Length := To; |
| end Set_Page_Length; |
| |
| procedure Set_Page_Length (To : Count) is |
| begin |
| Set_Page_Length (Current_Out, To); |
| end Set_Page_Length; |
| |
| -------------- |
| -- Set_WCEM -- |
| -------------- |
| |
| procedure Set_WCEM (File : in out File_Type) is |
| Start : Natural; |
| Stop : Natural; |
| |
| begin |
| File.WC_Method := WCEM_Brackets; |
| FIO.Form_Parameter (File.Form.all, "wcem", Start, Stop); |
| |
| if Start = 0 then |
| File.WC_Method := WCEM_Brackets; |
| |
| else |
| if Stop = Start then |
| for J in WC_Encoding_Letters'Range loop |
| if File.Form (Start) = WC_Encoding_Letters (J) then |
| File.WC_Method := J; |
| return; |
| end if; |
| end loop; |
| end if; |
| |
| Close (File); |
| raise Use_Error with "invalid WCEM form parameter"; |
| end if; |
| end Set_WCEM; |
| |
| --------------- |
| -- Skip_Line -- |
| --------------- |
| |
| procedure Skip_Line |
| (File : File_Type; |
| Spacing : Positive_Count := 1) |
| is |
| ch : int; |
| |
| begin |
| -- Raise Constraint_Error if out of range value. The reason for this |
| -- explicit test is that we don't want junk values around, even if |
| -- checks are off in the caller. |
| |
| if not Spacing'Valid then |
| raise Constraint_Error; |
| end if; |
| |
| FIO.Check_Read_Status (AP (File)); |
| |
| for L in 1 .. Spacing loop |
| if File.Before_LM then |
| File.Before_LM := False; |
| |
| -- Note that if File.Before_LM_PM is currently set, we also have |
| -- to reset it (because it makes sense for Before_LM_PM to be set |
| -- only when Before_LM is also set). This is done later on in this |
| -- subprogram, as soon as Before_LM_PM has been taken into account |
| -- for the purpose of page and line counts. |
| |
| else |
| ch := Getc (File); |
| |
| -- If at end of file now, then immediately raise End_Error. Note |
| -- that we can never be positioned between a line mark and a page |
| -- mark, so if we are at the end of file, we cannot logically be |
| -- before the implicit page mark that is at the end of the file. |
| |
| -- For the same reason, we do not need an explicit check for a |
| -- page mark. If there is a FF in the middle of a line, the file |
| -- is not in canonical format and we do not care about the page |
| -- numbers for files other than ones in canonical format. |
| |
| if ch = EOF then |
| raise End_Error; |
| end if; |
| |
| -- If not at end of file, then loop till we get to an LM or EOF. |
| -- The latter case happens only in non-canonical files where the |
| -- last line is not terminated by LM, but we don't want to blow |
| -- up for such files, so we assume an implicit LM in this case. |
| |
| loop |
| exit when ch = LM or else ch = EOF; |
| ch := Getc (File); |
| end loop; |
| end if; |
| |
| -- We have got past a line mark, now, for a regular file only, |
| -- see if a page mark immediately follows this line mark and |
| -- if so, skip past the page mark as well. We do not do this |
| -- for non-regular files, since it would cause an undesirable |
| -- wait for an additional character. |
| |
| File.Col := 1; |
| File.Line := File.Line + 1; |
| |
| if File.Before_LM_PM then |
| File.Page := File.Page + 1; |
| File.Line := 1; |
| File.Before_LM_PM := False; |
| |
| elsif File.Is_Regular_File then |
| ch := Getc (File); |
| |
| -- Page mark can be explicit, or implied at the end of the file |
| |
| if (ch = PM or else ch = EOF) |
| and then File.Is_Regular_File |
| then |
| File.Page := File.Page + 1; |
| File.Line := 1; |
| else |
| Ungetc (ch, File); |
| end if; |
| end if; |
| end loop; |
| |
| File.Before_Upper_Half_Character := False; |
| end Skip_Line; |
| |
| procedure Skip_Line (Spacing : Positive_Count := 1) is |
| begin |
| Skip_Line (Current_In, Spacing); |
| end Skip_Line; |
| |
| --------------- |
| -- Skip_Page -- |
| --------------- |
| |
| procedure Skip_Page (File : File_Type) is |
| ch : int; |
| |
| begin |
| FIO.Check_Read_Status (AP (File)); |
| |
| -- If at page mark already, just skip it |
| |
| if File.Before_LM_PM then |
| File.Before_LM := False; |
| File.Before_LM_PM := False; |
| File.Page := File.Page + 1; |
| File.Line := 1; |
| File.Col := 1; |
| return; |
| end if; |
| |
| -- This is a bit tricky, if we are logically before an LM then |
| -- it is not an error if we are at an end of file now, since we |
| -- are not really at it. |
| |
| if File.Before_LM then |
| File.Before_LM := False; |
| File.Before_LM_PM := False; |
| ch := Getc (File); |
| |
| -- Otherwise we do raise End_Error if we are at the end of file now |
| |
| else |
| ch := Getc (File); |
| |
| if ch = EOF then |
| raise End_Error; |
| end if; |
| end if; |
| |
| -- Now we can just rumble along to the next page mark, or to the |
| -- end of file, if that comes first. The latter case happens when |
| -- the page mark is implied at the end of file. |
| |
| loop |
| exit when ch = EOF |
| or else (ch = PM and then File.Is_Regular_File); |
| ch := Getc (File); |
| end loop; |
| |
| File.Page := File.Page + 1; |
| File.Line := 1; |
| File.Col := 1; |
| File.Before_Upper_Half_Character := False; |
| end Skip_Page; |
| |
| procedure Skip_Page is |
| begin |
| Skip_Page (Current_In); |
| end Skip_Page; |
| |
| -------------------- |
| -- Standard_Error -- |
| -------------------- |
| |
| function Standard_Error return File_Type is |
| begin |
| return Standard_Err; |
| end Standard_Error; |
| |
| function Standard_Error return File_Access is |
| begin |
| return Standard_Err'Access; |
| end Standard_Error; |
| |
| -------------------- |
| -- Standard_Input -- |
| -------------------- |
| |
| function Standard_Input return File_Type is |
| begin |
| return Standard_In; |
| end Standard_Input; |
| |
| function Standard_Input return File_Access is |
| begin |
| return Standard_In'Access; |
| end Standard_Input; |
| |
| --------------------- |
| -- Standard_Output -- |
| --------------------- |
| |
| function Standard_Output return File_Type is |
| begin |
| return Standard_Out; |
| end Standard_Output; |
| |
| function Standard_Output return File_Access is |
| begin |
| return Standard_Out'Access; |
| end Standard_Output; |
| |
| -------------------- |
| -- Terminate_Line -- |
| -------------------- |
| |
| procedure Terminate_Line (File : File_Type) is |
| begin |
| FIO.Check_File_Open (AP (File)); |
| |
| -- For file other than In_File, test for needing to terminate last line |
| |
| if Mode (File) /= In_File then |
| |
| -- If not at start of line definition need new line |
| |
| if File.Col /= 1 then |
| New_Line (File); |
| |
| -- For files other than standard error and standard output, we |
| -- make sure that an empty file has a single line feed, so that |
| -- it is properly formatted. We avoid this for the standard files |
| -- because it is too much of a nuisance to have these odd line |
| -- feeds when nothing has been written to the file. |
| |
| -- We also avoid this for files opened in append mode, in |
| -- accordance with (RM A.8.2(10)) |
| |
| elsif (File /= Standard_Err and then File /= Standard_Out) |
| and then (File.Line = 1 and then File.Page = 1) |
| and then Mode (File) = Out_File |
| then |
| New_Line (File); |
| end if; |
| end if; |
| end Terminate_Line; |
| |
| ------------ |
| -- Ungetc -- |
| ------------ |
| |
| procedure Ungetc (ch : int; File : File_Type) is |
| begin |
| if ch /= EOF then |
| if ungetc (ch, File.Stream) = EOF then |
| raise Device_Error; |
| end if; |
| end if; |
| end Ungetc; |
| |
| ----------- |
| -- Write -- |
| ----------- |
| |
| -- This is the primitive Stream Write routine, used when a Text_IO file |
| -- is treated directly as a stream using Text_IO.Streams.Stream. |
| |
| procedure Write |
| (File : in out Text_AFCB; |
| Item : Stream_Element_Array) |
| is |
| pragma Warnings (Off, File); |
| -- Because in this implementation we don't need IN OUT, we only read |
| |
| function Has_Translated_Characters return Boolean; |
| -- return True if Item array contains a character which will be |
| -- translated under the text file mode. There is only one such |
| -- character under DOS based systems which is character 10. |
| |
| text_translation_required : Boolean; |
| for text_translation_required'Size use Character'Size; |
| pragma Import (C, text_translation_required, |
| "__gnat_text_translation_required"); |
| |
| Siz : constant size_t := Item'Length; |
| |
| ------------------------------- |
| -- Has_Translated_Characters -- |
| ------------------------------- |
| |
| function Has_Translated_Characters return Boolean is |
| begin |
| for K in Item'Range loop |
| if Item (K) = 10 then |
| return True; |
| end if; |
| end loop; |
| return False; |
| end Has_Translated_Characters; |
| |
| Needs_Binary_Write : constant Boolean := |
| text_translation_required and then Has_Translated_Characters; |
| |
| -- Start of processing for Write |
| |
| begin |
| if File.Mode = FCB.In_File then |
| raise Mode_Error; |
| end if; |
| |
| -- Now we do the write. Since this is a text file, it is normally in |
| -- text mode, but stream data must be written in binary mode, so we |
| -- temporarily set binary mode for the write, resetting it after. This |
| -- is done only if needed (i.e. there is some characters in Item which |
| -- needs to be written using the binary mode). |
| -- These calls have no effect in a system (like Unix) where there is |
| -- no distinction between text and binary files. |
| |
| -- Since the character translation is done at the time the buffer is |
| -- written (this is true under Windows) we first flush current buffer |
| -- with text mode if needed. |
| |
| if Needs_Binary_Write then |
| if fflush (File.Stream) = -1 then |
| raise Device_Error; |
| end if; |
| |
| set_binary_mode (fileno (File.Stream)); |
| end if; |
| |
| if fwrite (Item'Address, 1, Siz, File.Stream) /= Siz then |
| raise Device_Error; |
| end if; |
| |
| -- At this point we need to flush the buffer using the binary mode then |
| -- we reset to text mode. |
| |
| if Needs_Binary_Write then |
| if fflush (File.Stream) = -1 then |
| raise Device_Error; |
| end if; |
| |
| set_text_mode (fileno (File.Stream)); |
| end if; |
| end Write; |
| |
| begin |
| -- Initialize Standard Files |
| |
| for J in WC_Encoding_Method loop |
| if WC_Encoding = WC_Encoding_Letters (J) then |
| Default_WCEM := J; |
| end if; |
| end loop; |
| |
| Initialize_Standard_Files; |
| |
| FIO.Chain_File (AP (Standard_In)); |
| FIO.Chain_File (AP (Standard_Out)); |
| FIO.Chain_File (AP (Standard_Err)); |
| |
| end Ada.Text_IO; |
