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322 | -- SPDX-License-Identifier: Apache-2.0
--
-- Copyright (c) 2021 onox <denkpadje@gmail.com>
--
-- Licensed under the Apache License, Version 2.0 (the "License");
-- you may not use this file except in compliance with the License.
-- You may obtain a copy of the License at
--
-- http://www.apache.org/licenses/LICENSE-2.0
--
-- Unless required by applicable law or agreed to in writing, software
-- distributed under the License is distributed on an "AS IS" BASIS,
-- WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
-- See the License for the specific language governing permissions and
-- limitations under the License.
with Interfaces.C.Pointers;
with Ada.Characters.Latin_1;
with Ada.Unchecked_Conversion;
with Ada.Unchecked_Deallocation;
package body AWT.OS is
use all type AWT.Inputs.Pointer_Button;
use all type AWT.Inputs.Keyboard_Button;
package L1 renames Ada.Characters.Latin_1;
function Code_To_Button (Code : Unsigned_32) return AWT.Inputs.Pointer_Button is
(case Code is
when 272 => Left,
when 273 => Right,
when 274 => Middle,
when others => Unknown);
function Code_To_Button (Code : Unsigned_32) return AWT.Inputs.Keyboard_Button is
(case Code is
when 1 => Key_Escape,
when 2 => Key_1,
when 3 => Key_2,
when 4 => Key_3,
when 5 => Key_4,
when 6 => Key_5,
when 7 => Key_6,
when 8 => Key_7,
when 9 => Key_8,
when 10 => Key_9,
when 11 => Key_0,
when 12 => Key_Minus,
when 13 => Key_Equal,
when 14 => Key_Backspace,
when 15 => Key_Tab,
when 16 => Key_Q,
when 17 => Key_W,
when 18 => Key_E,
when 19 => Key_R,
when 20 => Key_T,
when 21 => Key_Y,
when 22 => Key_U,
when 23 => Key_I,
when 24 => Key_O,
when 25 => Key_P,
when 26 => Key_Left_Bracket,
when 27 => Key_Right_Bracket,
when 28 => Key_Enter,
when 29 => Key_Left_Ctrl,
when 30 => Key_A,
when 31 => Key_S,
when 32 => Key_D,
when 33 => Key_F,
when 34 => Key_G,
when 35 => Key_H,
when 36 => Key_J,
when 37 => Key_K,
when 38 => Key_L,
when 39 => Key_Semicolon,
when 40 => Key_Apostrophe,
when 41 => Key_Backtick,
when 42 => Key_Left_Shift,
when 43 => Key_Backslash,
when 44 => Key_Z,
when 45 => Key_X,
when 46 => Key_C,
when 47 => Key_V,
when 48 => Key_B,
when 49 => Key_N,
when 50 => Key_M,
when 51 => Key_Comma,
when 52 => Key_Period,
when 53 => Key_Slash,
when 54 => Key_Right_Shift,
when 55 => Key_Numpad_Asterisk,
when 56 => Key_Left_Alt,
when 57 => Key_Space,
when 58 => Key_Caps_Lock,
when 59 => Key_F1,
when 60 => Key_F2,
when 61 => Key_F3,
when 62 => Key_F4,
when 63 => Key_F5,
when 64 => Key_F6,
when 65 => Key_F7,
when 66 => Key_F8,
when 67 => Key_F9,
when 68 => Key_F10,
when 69 => Key_Num_Lock,
when 70 => Key_Scroll_Lock,
when 71 => Key_Numpad_7,
when 72 => Key_Numpad_8,
when 73 => Key_Numpad_9,
when 74 => Key_Numpad_Minus,
when 75 => Key_Numpad_4,
when 76 => Key_Numpad_5,
when 77 => Key_Numpad_6,
when 78 => Key_Numpad_Plus,
when 79 => Key_Numpad_1,
when 80 => Key_Numpad_2,
when 81 => Key_Numpad_3,
when 82 => Key_Numpad_0,
when 83 => Key_Numpad_Period,
-- 84 .. 86
when 87 => Key_F11,
when 88 => Key_F12,
-- 89 .. 95
when 96 => Key_Numpad_Enter,
when 97 => Key_Right_Ctrl,
when 98 => Key_Numpad_Slash,
when 99 => Key_Print_Screen,
when 100 => Key_Right_Alt,
-- 101
when 102 => Key_Home,
when 103 => Key_Arrow_Up,
when 104 => Key_Page_Up,
when 105 => Key_Arrow_Left,
when 106 => Key_Arrow_Right,
when 107 => Key_End,
when 108 => Key_Arrow_Down,
when 109 => Key_Page_Down,
when 110 => Key_Insert,
when 111 => Key_Delete,
-- 112 .. 118
when 119 => Key_Pause,
-- 120 .. 124
when 125 => Key_Left_Logo,
when 126 => Key_Right_Logo,
when others => Key_Unknown);
procedure Create_Pipe (Result : out Pipe) is
type File_Descriptor_Array is array (1 .. 2) of Standard.Wayland.File_Descriptor
with Convention => C;
function C_Pipe
(File_Descriptors : in out File_Descriptor_Array) return Integer
with Import, Convention => C, External_Name => "pipe";
File_Descriptors : File_Descriptor_Array;
begin
if C_Pipe (File_Descriptors) = 0 then
Result := (Read => File_Descriptors (1), Write => File_Descriptors (2));
else
raise Constraint_Error;
end if;
end Create_Pipe;
function Read (Object : File) return Ada.Streams.Stream_Element_Array is
Content : Ada.Streams.Stream_Element_Array (1 .. 1024);
Result : constant C_Binding.Result := C_Binding.Read (Object.Handle, Content);
use all type C_Binding.Result_Kind;
begin
case Result.Kind is
when Success =>
return Content (1 .. Result.Count);
when EOF =>
return Content (1 .. 0);
when Failure =>
raise Constraint_Error;
end case;
end Read;
procedure Write (Object : in out File; Value : String) is
subtype Byte_Array is Ada.Streams.Stream_Element_Array (1 .. Value'Length);
function Convert is new Ada.Unchecked_Conversion
(Source => String, Target => Byte_Array);
Result : constant C_Binding.Result := C_Binding.Write (Object.Handle, Convert (Value));
use all type C_Binding.Result_Kind;
use type Ada.Streams.Stream_Element_Offset;
begin
if Result.Kind /= Success or else Result.Count < Value'Length then
raise Constraint_Error;
end if;
end Write;
function Open (Path : String; Flags : Access_Flag := Read) return File is
Result : constant C_Binding.File := C_Binding.Open
(Path, (case Flags is
when Read => C_Binding.Read_Only,
when Write => C_Binding.Write_Only,
when Read_Write => C_Binding.Read_Write));
begin
return (File_Descriptor => Result.File_Descriptor, Handle => Result);
end Open;
procedure Close (Object : in out File) is
begin
C_Binding.Close (Object.Handle);
end Close;
function Is_Open (Object : File) return Boolean is (C_Binding.Is_Open (Object.Handle));
----------------------------------------------------------------------------
use Interfaces.C;
subtype Name_C_String is char_array (1 .. 256);
type Dir_Entry is record
Inode : unsigned_long;
Offset : long;
Length : unsigned_short;
Kind : C_Binding.Entry_Kind;
Name : Name_C_String;
end record
with Convention => C_Pass_By_Copy;
type Dir_Entry_Access is access Dir_Entry;
type Dir_Entry_Array is array (Natural range <>) of aliased Dir_Entry_Access
with Convention => C;
package Dir_Entry_Pointers is new Interfaces.C.Pointers
(Natural, Dir_Entry_Access, Dir_Entry_Array, null);
function C_Scandir
(Path : String;
Names : access Dir_Entry_Pointers.Pointer;
Filter : access function (Node : Dir_Entry_Access) return int;
Compare : access function (Left, Right : access Dir_Entry_Access) return int)
return int
with Import, Convention => C, External_Name => "scandir";
function Convert (Kind : C_Binding.Entry_Kind) return Entry_Kind is
(case Kind is
when C_Binding.Unknown => raise Program_Error,
when C_Binding.Directory => Directory,
when C_Binding.Regular_File => Regular_File,
when C_Binding.Character_Device => Device_File,
when C_Binding.Block_Device => Device_File,
when C_Binding.Link => Symbolic_Link,
when C_Binding.FIFO => Named_Pipe,
when C_Binding.Socket => Socket);
Directory_Filter : Filter_Type;
function Is_Match_Filter (Node : Dir_Entry_Access) return int
with Convention => C;
function Is_Match_Filter (Node : Dir_Entry_Access) return int is
begin
return (if Directory_Filter (Convert (Node.Kind)) then 1 else 0);
exception
when Program_Error =>
return 0;
end Is_Match_Filter;
function Scan_Directory
(Path : String;
Filter : Filter_Type := (others => True)) return Directory_Entry_Array
is
procedure Free is new Ada.Unchecked_Deallocation
(Dir_Entry, Dir_Entry_Access);
procedure Free is new Ada.Unchecked_Deallocation
(Dir_Entry_Access, Dir_Entry_Pointers.Pointer);
Names : aliased Dir_Entry_Pointers.Pointer;
Count : int;
use type Dir_Entry_Pointers.Pointer;
begin
-- This global is a bit unfortunate; an 'Access of a nested subprogram
-- with a foreign language convention requires a trampoline, which is
-- forbidden because of the No_Implicit_Dynamic_Code restriction.
Directory_Filter := Filter;
Count := C_Scandir (Path & L1.NUL, Names'Access, Is_Match_Filter'Access, null);
if Count = -1 then
raise Constraint_Error;
end if;
if Names = null then
return Result : Directory_Entry_Array (1 .. 0);
end if;
declare
Entries : constant Dir_Entry_Array :=
Dir_Entry_Pointers.Value (Names, ptrdiff_t (Count));
begin
return Result : Directory_Entry_Array (Entries'Range) do
for Index in Entries'Range loop
declare
Node : Dir_Entry_Access := Entries (Index);
begin
Result (Index).Kind := Convert (Node.all.Kind);
Result (Index).Name := +To_Ada (Node.all.Name);
Free (Node);
end;
end loop;
Free (Names);
end return;
end;
end Scan_Directory;
end AWT.OS;
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