1------------------------------------------------------------------------------ 2-- -- 3-- GNAT RUNTIME COMPONENTS -- 4-- -- 5-- S Y S T E M . S E Q U E N T I A L _ I O -- 6-- -- 7-- B o d y -- 8-- -- 9-- Copyright (C) 1992-2002 Free Software Foundation, Inc. -- 10-- -- 11-- GNAT is free software; you can redistribute it and/or modify it under -- 12-- terms of the GNU General Public License as published by the Free Soft- -- 13-- ware Foundation; either version 2, or (at your option) any later ver- -- 14-- sion. GNAT is distributed in the hope that it will be useful, but WITH- -- 15-- OUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY -- 16-- or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License -- 17-- for more details. You should have received a copy of the GNU General -- 18-- Public License distributed with GNAT; see file COPYING. If not, write -- 19-- to the Free Software Foundation, 59 Temple Place - Suite 330, Boston, -- 20-- MA 02111-1307, USA. -- 21-- -- 22-- As a special exception, if other files instantiate generics from this -- 23-- unit, or you link this unit with other files to produce an executable, -- 24-- this unit does not by itself cause the resulting executable to be -- 25-- covered by the GNU General Public License. This exception does not -- 26-- however invalidate any other reasons why the executable file might be -- 27-- covered by the GNU Public License. -- 28-- -- 29-- GNAT was originally developed by the GNAT team at New York University. -- 30-- Extensive contributions were provided by Ada Core Technologies Inc. -- 31-- -- 32------------------------------------------------------------------------------ 33 34with System.File_IO; 35with Unchecked_Deallocation; 36 37package body System.Sequential_IO is 38 39 subtype AP is FCB.AFCB_Ptr; 40 41 package FIO renames System.File_IO; 42 43 ------------------- 44 -- AFCB_Allocate -- 45 ------------------- 46 47 function AFCB_Allocate 48 (Control_Block : Sequential_AFCB) 49 return FCB.AFCB_Ptr 50 is 51 pragma Warnings (Off, Control_Block); 52 53 begin 54 return new Sequential_AFCB; 55 end AFCB_Allocate; 56 57 ---------------- 58 -- AFCB_Close -- 59 ---------------- 60 61 -- No special processing required for Sequential_IO close 62 63 procedure AFCB_Close (File : access Sequential_AFCB) is 64 pragma Warnings (Off, File); 65 66 begin 67 null; 68 end AFCB_Close; 69 70 --------------- 71 -- AFCB_Free -- 72 --------------- 73 74 procedure AFCB_Free (File : access Sequential_AFCB) is 75 76 type FCB_Ptr is access all Sequential_AFCB; 77 78 FT : FCB_Ptr := FCB_Ptr (File); 79 80 procedure Free is new 81 Unchecked_Deallocation (Sequential_AFCB, FCB_Ptr); 82 83 begin 84 Free (FT); 85 end AFCB_Free; 86 87 ------------ 88 -- Create -- 89 ------------ 90 91 procedure Create 92 (File : in out File_Type; 93 Mode : in FCB.File_Mode := FCB.Out_File; 94 Name : in String := ""; 95 Form : in String := "") 96 is 97 Dummy_File_Control_Block : Sequential_AFCB; 98 pragma Warnings (Off, Dummy_File_Control_Block); 99 -- Yes, we know this is never assigned a value, only the tag 100 -- is used for dispatching purposes, so that's expected. 101 102 begin 103 FIO.Open (File_Ptr => AP (File), 104 Dummy_FCB => Dummy_File_Control_Block, 105 Mode => Mode, 106 Name => Name, 107 Form => Form, 108 Amethod => 'Q', 109 Creat => True, 110 Text => False); 111 end Create; 112 113 ---------- 114 -- Open -- 115 ---------- 116 117 procedure Open 118 (File : in out File_Type; 119 Mode : in FCB.File_Mode; 120 Name : in String; 121 Form : in String := "") 122 is 123 Dummy_File_Control_Block : Sequential_AFCB; 124 pragma Warnings (Off, Dummy_File_Control_Block); 125 -- Yes, we know this is never assigned a value, only the tag 126 -- is used for dispatching purposes, so that's expected. 127 128 begin 129 FIO.Open (File_Ptr => AP (File), 130 Dummy_FCB => Dummy_File_Control_Block, 131 Mode => Mode, 132 Name => Name, 133 Form => Form, 134 Amethod => 'Q', 135 Creat => False, 136 Text => False); 137 end Open; 138 139 ---------- 140 -- Read -- 141 ---------- 142 143 -- Not used, since Sequential_IO files are not used as streams 144 145 procedure Read 146 (File : in out Sequential_AFCB; 147 Item : out Ada.Streams.Stream_Element_Array; 148 Last : out Ada.Streams.Stream_Element_Offset) 149 is 150 begin 151 raise Program_Error; 152 end Read; 153 154 ----------- 155 -- Write -- 156 ----------- 157 158 -- Not used, since Sequential_IO files are not used as streams 159 160 procedure Write 161 (File : in out Sequential_AFCB; 162 Item : in Ada.Streams.Stream_Element_Array) 163 is 164 begin 165 raise Program_Error; 166 end Write; 167 168end System.Sequential_IO; 169