| ------------------------------------------------------------------------------ |
| -- -- |
| -- GNAT COMPILER COMPONENTS -- |
| -- -- |
| -- I N T E R F A C E S . C _ S T R E A M S -- |
| -- -- |
| -- B o d y -- |
| -- -- |
| -- Copyright (C) 1996-2005, 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 2, 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. See the GNU General Public License -- |
| -- for more details. You should have received a copy of the GNU General -- |
| -- Public License distributed with GNAT; see file COPYING. If not, write -- |
| -- to the Free Software Foundation, 51 Franklin Street, Fifth Floor, -- |
| -- Boston, MA 02110-1301, USA. -- |
| -- -- |
| -- As a special exception, if other files instantiate generics from this -- |
| -- unit, or you link this unit with other files to produce an executable, -- |
| -- this unit does not by itself cause the resulting executable to be -- |
| -- covered by the GNU General Public License. This exception does not -- |
| -- however invalidate any other reasons why the executable file might be -- |
| -- covered by the GNU Public License. -- |
| -- -- |
| -- GNAT was originally developed by the GNAT team at New York University. -- |
| -- Extensive contributions were provided by Ada Core Technologies Inc. -- |
| -- -- |
| ------------------------------------------------------------------------------ |
| |
| -- This is the Alpha/VMS version |
| |
| with Unchecked_Conversion; |
| package body Interfaces.C_Streams is |
| |
| use type System.CRTL.size_t; |
| |
| -- As the functions fread, fwrite and setvbuf are too big to be inlined, |
| -- they are just wrappers to the following implementation functions. |
| |
| function fread_impl |
| (buffer : voids; |
| size : size_t; |
| count : size_t; |
| stream : FILEs) return size_t; |
| |
| function fread_impl |
| (buffer : voids; |
| index : size_t; |
| size : size_t; |
| count : size_t; |
| stream : FILEs) return size_t; |
| |
| function fwrite_impl |
| (buffer : voids; |
| size : size_t; |
| count : size_t; |
| stream : FILEs) return size_t; |
| |
| function setvbuf_impl |
| (stream : FILEs; |
| buffer : chars; |
| mode : int; |
| size : size_t) return int; |
| |
| ------------ |
| -- fread -- |
| ------------ |
| |
| function fread_impl |
| (buffer : voids; |
| size : size_t; |
| count : size_t; |
| stream : FILEs) return size_t |
| is |
| Get_Count : size_t := 0; |
| |
| type Buffer_Type is array (size_t range 1 .. count, |
| size_t range 1 .. size) of Character; |
| type Buffer_Access is access Buffer_Type; |
| function To_BA is new Unchecked_Conversion (voids, Buffer_Access); |
| |
| BA : constant Buffer_Access := To_BA (buffer); |
| Ch : int; |
| |
| begin |
| -- This Fread goes with the Fwrite below. The C library fread sometimes |
| -- can't read fputc generated files. |
| |
| for C in 1 .. count loop |
| for S in 1 .. size loop |
| Ch := fgetc (stream); |
| |
| if Ch = EOF then |
| return Get_Count; |
| end if; |
| |
| BA.all (C, S) := Character'Val (Ch); |
| end loop; |
| |
| Get_Count := Get_Count + 1; |
| end loop; |
| |
| return Get_Count; |
| end fread_impl; |
| |
| function fread_impl |
| (buffer : voids; |
| index : size_t; |
| size : size_t; |
| count : size_t; |
| stream : FILEs) return size_t |
| is |
| Get_Count : size_t := 0; |
| |
| type Buffer_Type is array (size_t range 1 .. count, |
| size_t range 1 .. size) of Character; |
| type Buffer_Access is access Buffer_Type; |
| function To_BA is new Unchecked_Conversion (voids, Buffer_Access); |
| |
| BA : constant Buffer_Access := To_BA (buffer); |
| Ch : int; |
| |
| begin |
| -- This Fread goes with the Fwrite below. The C library fread sometimes |
| -- can't read fputc generated files. |
| |
| for C in 1 + index .. count + index loop |
| for S in 1 .. size loop |
| Ch := fgetc (stream); |
| |
| if Ch = EOF then |
| return Get_Count; |
| end if; |
| |
| BA.all (C, S) := Character'Val (Ch); |
| end loop; |
| |
| Get_Count := Get_Count + 1; |
| end loop; |
| |
| return Get_Count; |
| end fread_impl; |
| |
| function fread |
| (buffer : voids; |
| size : size_t; |
| count : size_t; |
| stream : FILEs) return size_t |
| is |
| begin |
| return fread_impl (buffer, size, count, stream); |
| end fread; |
| |
| function fread |
| (buffer : voids; |
| index : size_t; |
| size : size_t; |
| count : size_t; |
| stream : FILEs) return size_t |
| is |
| begin |
| return fread_impl (buffer, index, size, count, stream); |
| end fread; |
| |
| ------------ |
| -- fwrite -- |
| ------------ |
| |
| function fwrite_impl |
| (buffer : voids; |
| size : size_t; |
| count : size_t; |
| stream : FILEs) return size_t |
| is |
| Put_Count : size_t := 0; |
| |
| type Buffer_Type is array (size_t range 1 .. count, |
| size_t range 1 .. size) of Character; |
| type Buffer_Access is access Buffer_Type; |
| function To_BA is new Unchecked_Conversion (voids, Buffer_Access); |
| |
| BA : constant Buffer_Access := To_BA (buffer); |
| |
| begin |
| -- Fwrite on VMS has the undesirable effect of always generating at |
| -- least one record of output per call, regardless of buffering. To |
| -- get around this, we do multiple fputc calls instead. |
| |
| for C in 1 .. count loop |
| for S in 1 .. size loop |
| if fputc (Character'Pos (BA.all (C, S)), stream) = EOF then |
| return Put_Count; |
| end if; |
| end loop; |
| |
| Put_Count := Put_Count + 1; |
| end loop; |
| |
| return Put_Count; |
| end fwrite_impl; |
| |
| function fwrite |
| (buffer : voids; |
| size : size_t; |
| count : size_t; |
| stream : FILEs) return size_t |
| is |
| begin |
| return fwrite_impl (buffer, size, count, stream); |
| end fwrite; |
| |
| ------------- |
| -- setvbuf -- |
| ------------- |
| |
| function setvbuf_impl |
| (stream : FILEs; |
| buffer : chars; |
| mode : int; |
| size : size_t) return int |
| is |
| use type System.Address; |
| |
| begin |
| -- In order for the above fwrite hack to work, we must always buffer |
| -- stdout and stderr. Is_regular_file on VMS cannot detect when |
| -- these are redirected to a file, so checking for that condition |
| -- doesnt help. |
| |
| if mode = IONBF |
| and then (stream = stdout or else stream = stderr) |
| then |
| return System.CRTL.setvbuf |
| (stream, buffer, IOLBF, System.CRTL.size_t (size)); |
| else |
| return System.CRTL.setvbuf |
| (stream, buffer, mode, System.CRTL.size_t (size)); |
| end if; |
| end setvbuf_impl; |
| |
| function setvbuf |
| (stream : FILEs; |
| buffer : chars; |
| mode : int; |
| size : size_t) return int |
| is |
| begin |
| return setvbuf_impl (stream, buffer, mode, size); |
| end setvbuf; |
| |
| end Interfaces.C_Streams; |
