From 554fd8c5195424bdbcabf5de30fdc183aba391bd Mon Sep 17 00:00:00 2001 From: upstream source tree Date: Sun, 15 Mar 2015 20:14:05 -0400 Subject: obtained gcc-4.6.4.tar.bz2 from upstream website; verified gcc-4.6.4.tar.bz2.sig; imported gcc-4.6.4 source tree from verified upstream tarball. downloading a git-generated archive based on the 'upstream' tag should provide you with a source tree that is binary identical to the one extracted from the above tarball. if you have obtained the source via the command 'git clone', however, do note that line-endings of files in your working directory might differ from line-endings of the respective files in the upstream repository. --- gcc/ada/a-textio.adb | 2205 ++++++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 2205 insertions(+) create mode 100644 gcc/ada/a-textio.adb (limited to 'gcc/ada/a-textio.adb') diff --git a/gcc/ada/a-textio.adb b/gcc/ada/a-textio.adb new file mode 100644 index 000000000..721deca03 --- /dev/null +++ b/gcc/ada/a-textio.adb @@ -0,0 +1,2205 @@ +------------------------------------------------------------------------------ +-- -- +-- GNAT RUN-TIME COMPONENTS -- +-- -- +-- A D A . T E X T _ I O -- +-- -- +-- B o d y -- +-- -- +-- Copyright (C) 1992-2010, 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 -- +-- . -- +-- -- +-- 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 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.Is_Text_File := True; + 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.Is_Text_File := True; + 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.Is_Text_File := True; + 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 + FIO.Check_Write_Status (AP (Current_Out)); + + if Current_Out.Line_Length /= 0 + and then Current_Out.Col > Current_Out.Line_Length + then + New_Line (Current_Out); + end if; + + -- If lower half character, or brackets encoding, output directly + + if Character'Pos (Item) < 16#80# + or else Default_WCEM = WCEM_Brackets + then + if fputc (Character'Pos (Item), Current_Out.Stream) = EOF then + raise Device_Error; + end if; + + -- Case of upper half character with non-brackets encoding + + else + Put_Encoded (Current_Out, Item); + end if; + + Current_Out.Col := Current_Out.Col + 1; + 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; -- cgit v1.2.3