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1322 | ------------------------------------------------------------------------------
-- Ada Web Server --
-- --
-- Copyright (C) 2000-2021, AdaCore --
-- --
-- This library is free software; you can redistribute it and/or modify --
-- it under terms of the GNU General Public License as published by the --
-- Free Software Foundation; either version 3, or (at your option) any --
-- later version. This library is distributed in the hope that it will be --
-- useful, but WITHOUT 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/>. --
-- --
-- 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. --
------------------------------------------------------------------------------
pragma Ada_2012;
with Ada.Calendar.Time_Zones;
with Ada.Integer_Text_IO;
with Ada.Numerics.Discrete_Random;
with Ada.Numerics.Long_Elementary_Functions;
with Ada.Streams.Stream_IO;
with Ada.Strings.Fixed;
with Ada.Strings.Maps.Constants;
with Ada.Text_IO;
pragma Warnings (Off);
with Ada.Strings.Unbounded.Aux;
pragma Warnings (On);
with System;
with AWS.OS_Lib;
package body AWS.Utils is
use type Ada.Directories.File_Kind;
package Integer_Random is new Numerics.Discrete_Random (Random_Integer);
function Local_To_GMT (DT : Calendar.Time) return Calendar.Time
with Inline;
procedure Compress_Decompress
(Filter : in out ZLib.Filter_Type;
Filename_In : String;
Filename_Out : String);
-- Compress or decompress (depending on the filter initialization)
-- from Filename_In to Filename_Out.
function Is_Valid_UTF8
(Str : Aux.Big_String_Access; Last : Natural) return Boolean;
-- Returns True if the string pointed to by Str and terminating to Last
-- is well-formed UTF-8.
protected Shared_Random is
function Generate return Random_Integer;
procedure Reset;
procedure Reset (Seed : Integer);
private
Random_Generator : Integer_Random.Generator;
end Shared_Random;
---------------------
-- Append_With_Sep --
---------------------
procedure Append_With_Sep
(Content : in out Unbounded_String;
Value : String;
Sep : String := ", ") is
begin
if Content /= Null_Unbounded_String then
Append (Content, Sep);
end if;
Append (Content, Value);
end Append_With_Sep;
-------------------
-- Buffered_Data --
-------------------
package body Buffered_Data is
Content : Stream_Element_Array_Access :=
new Stream_Element_Array (1 .. Max_Size);
Pos : Stream_Element_Offset := 0;
---------
-- Add --
---------
procedure Add (Data : Stream_Element_Array) is
First : Stream_Element_Offset := Data'First;
Free : Stream_Element_Count;
Chunk : Stream_Element_Count;
begin
while First <= Data'Last loop
-- Free room on the buffer
Free := Max_Size - Pos;
-- The max chunk size which can be added to content
Chunk := Stream_Element_Count'Min (Data'Length, Free);
Pos := Pos + 1;
Content (Pos .. Pos + Chunk - 1) :=
Data (First .. First + Chunk - 1);
First := First + Chunk;
Pos := Pos + Chunk - 1;
-- If the buffer is full, handle it
if Pos = Max_Size then
Action (Content);
Content := new Stream_Element_Array (1 .. Max_Size);
Pos := 0;
end if;
end loop;
end Add;
-----------
-- Flush --
-----------
procedure Flush is
begin
if Pos > 0 then
Action (new Stream_Element_Array'(Content (1 .. Pos)));
Pos := 0;
Unchecked_Free (Content);
end if;
end Flush;
------------
-- Length --
------------
function Length return Stream_Element_Count is
begin
return Pos;
end Length;
end Buffered_Data;
--------------
-- Compress --
--------------
procedure Compress
(Filename : String;
Level : ZLib.Compression_Level := ZLib.Default_Compression)
is
Filter : ZLib.Filter_Type;
begin
ZLib.Deflate_Init (Filter, Level => Level, Header => ZLib.GZip);
Compress_Decompress (Filter, Filename, Filename & ".gz");
ZLib.Close (Filter);
exception
when others =>
ZLib.Close (Filter, Ignore_Error => True);
raise;
end Compress;
-------------------------
-- Compress_Decompress --
-------------------------
procedure Compress_Decompress
(Filter : in out ZLib.Filter_Type;
Filename_In : String;
Filename_Out : String)
is
procedure Data_In
(Item : out Stream_Element_Array;
Last : out Stream_Element_Offset);
-- Retrieve a chunk of data from the file
procedure Data_Out
(Item : Stream_Element_Array);
-- Write a chunk of data into the compressed file
procedure Translate is new ZLib.Generic_Translate (Data_In, Data_Out);
File_In, File_Out : Stream_IO.File_Type;
-------------
-- Data_In --
-------------
procedure Data_In
(Item : out Stream_Element_Array;
Last : out Stream_Element_Offset) is
begin
Stream_IO.Read (File_In, Item, Last);
end Data_In;
--------------
-- Data_Out --
--------------
procedure Data_Out (Item : Stream_Element_Array) is
begin
Stream_IO.Write (File_Out, Item);
end Data_Out;
begin
Stream_IO.Open (File_In, Stream_IO.In_File, Filename_In);
Stream_IO.Create (File_Out, Stream_IO.Out_File, Filename_Out);
Translate (Filter);
Stream_IO.Close (File_Out);
-- Everything was ok, let's remove the original file now
Stream_IO.Delete (File_In);
exception
when others =>
if Stream_IO.Is_Open (File_In) then
Stream_IO.Close (File_In);
end if;
if Stream_IO.Is_Open (File_Out) then
Stream_IO.Close (File_Out);
end if;
raise;
end Compress_Decompress;
-------------
-- Counter --
-------------
protected body Counter is
---------------
-- Decrement --
---------------
procedure Decrement (Amount : Natural := 1) is
begin
C := C - Amount;
end Decrement;
procedure Decrement (Amount : Natural := 1; Value : out Natural) is
begin
C := C - Amount;
Value := C;
end Decrement;
---------------
-- Increment --
---------------
procedure Increment (Amount : Natural := 1) is
begin
C := C + Amount;
end Increment;
procedure Increment (Amount : Natural := 1; Value : out Natural) is
begin
C := C + Amount;
Value := C;
end Increment;
-----------
-- Value --
-----------
function Value return Natural is
begin
return C;
end Value;
----------
-- Zero --
----------
entry Zero when C = 0 is
begin
null;
end Zero;
end Counter;
-------------------
-- CRLF_2_Spaces --
-------------------
function CRLF_2_Spaces (Str : String) return String is
begin
return Strings.Fixed.Trim
(Strings.Fixed.Translate
(Str,
Strings.Maps.To_Mapping (From => ASCII.CR & ASCII.LF, To => " ")),
Strings.Right);
end CRLF_2_Spaces;
----------------
-- Decompress --
----------------
procedure Decompress (Filename : String) is
Filter : ZLib.Filter_Type;
begin
ZLib.Inflate_Init (Filter, Header => ZLib.GZip);
Compress_Decompress
(Filter, Filename, Directories.Base_Name (Filename));
ZLib.Close (Filter);
exception
when others =>
ZLib.Close (Filter, Ignore_Error => True);
raise;
end Decompress;
-------------
-- Dequote --
-------------
function Dequote (Str : String) return String is
begin
if Str'Length < 2
or else (Str (Str'First) /= '"' or else Str (Str'Last) /= '"')
then
return Str;
else
return Str (Str'First + 1 .. Str'Last - 1);
end if;
end Dequote;
-----------------
-- Dump_Binary --
-----------------
procedure Dump_Binary (Data : Stream_Element_Array) is
use Ada.Text_IO;
Printable : Boolean := True;
begin
for E of Data loop
Put (Hex (Natural (E), 2));
Put (" ");
if Character'Val (E) not in ASCII.CR | ASCII.LF | ' ' .. '~' then
Printable := False;
end if;
end loop;
New_Line;
if Printable then
Put ('"');
for E of Data loop
Put (Character'Val (E));
end loop;
Put ('"');
New_Line;
end if;
end Dump_Binary;
---------------
-- File_Size --
---------------
function File_Size (Filename : String) return File_Size_Type is
begin
if Is_Regular_File (Filename) then
return Directories.Size (Filename);
else
raise No_Such_File with "File " & Filename & " not found.";
end if;
end File_Size;
---------------------
-- File_Time_Stamp --
---------------------
function File_Time_Stamp (Filename : String) return Ada.Calendar.Time is
begin
if Is_Regular_File (Filename)
or else Is_Directory (Filename)
then
return Local_To_GMT (Directories.Modification_Time (Filename));
else
raise No_Such_File with "File " & Filename & " not found.";
end if;
end File_Time_Stamp;
--------------
-- Finalize --
--------------
overriding procedure Finalize (Object : in out Finalizer) is
begin
Object.Action.all;
end Finalize;
-------------------------------
-- For_Every_Directory_Entry --
-------------------------------
procedure For_Every_Directory_Entry (Directory_Name : String) is
Dir_Name : constant String := Normalized_Directory (Directory_Name);
Iter : Directories.Search_Type;
Item : Directories.Directory_Entry_Type;
Quit : Boolean := False;
begin
Directories.Start_Search (Iter, Directory_Name, "");
while Directories.More_Entries (Iter) loop
Directories.Get_Next_Entry (Iter, Item);
Action
(Directories.Simple_Name (Item),
Is_Directory (Dir_Name & Directories.Simple_Name (Item)),
Quit => Quit);
exit when Quit;
end loop;
Directories.End_Search (Iter);
exception
when Text_IO.Name_Error =>
raise No_Such_File;
end For_Every_Directory_Entry;
---------------
-- GMT_Clock --
---------------
function GMT_Clock return Calendar.Time is
begin
return Local_To_GMT (Calendar.Clock);
end GMT_Clock;
-----------------
-- Head_Before --
-----------------
function Head_Before (Source, Pattern : String) return String is
Index : constant Natural := Strings.Fixed.Index (Source, Pattern);
begin
if Index = 0 then
return Source;
else
return Source (Source'First .. Index - 1);
end if;
end Head_Before;
---------
-- Hex --
---------
function Hex (V : Natural; Width : Natural := 0) return Hex_String is
use Strings;
Hex_V : String (1 .. Integer'Size / 4 + 4);
begin
Integer_Text_IO.Put (Hex_V, V, 16);
declare
Result : constant String :=
Hex_V (Fixed.Index (Hex_V, "#") + 1
.. Fixed.Index (Hex_V, "#", Backward) - 1);
begin
if Width = 0 then
return Result;
elsif Result'Length < Width then
declare
use Ada.Strings.Fixed;
Zero : constant String := (Width - Result'Length) * '0';
begin
return Zero & Result;
end;
else
return Result (Result'Last - Width + 1 .. Result'Last);
end if;
end;
end Hex;
---------------
-- Hex_Value --
---------------
function Hex_Value (Hex : Hex_String) return Natural is
function Value (C : Character) return Natural with Inline;
-- Return value for single character C
-----------
-- Value --
-----------
function Value (C : Character) return Natural is
begin
case C is
when '0' => return 0;
when '1' => return 1;
when '2' => return 2;
when '3' => return 3;
when '4' => return 4;
when '5' => return 5;
when '6' => return 6;
when '7' => return 7;
when '8' => return 8;
when '9' => return 9;
when 'a' | 'A' => return 10;
when 'b' | 'B' => return 11;
when 'c' | 'C' => return 12;
when 'd' | 'D' => return 13;
when 'e' | 'E' => return 14;
when 'f' | 'F' => return 15;
when others => raise Constraint_Error;
end case;
end Value;
R : Natural := 0;
begin
for H of Hex loop
R := R * 16 + Value (H);
end loop;
return R;
end Hex_Value;
-----------
-- Image --
-----------
function Image (N : Natural) return String is
N_Img : constant String := Natural'Image (N);
begin
return N_Img (N_Img'First + 1 .. N_Img'Last);
end Image;
-----------
-- Image --
-----------
function Image (N : Stream_Element_Offset) return String is
N_Img : constant String := Stream_Element_Offset'Image (N);
begin
if N_Img (N_Img'First) = ' ' then
return N_Img (N_Img'First + 1 .. N_Img'Last);
else
return N_Img;
end if;
end Image;
-----------
-- Image --
-----------
function Image (D : Duration; Aft : Positive := 2) return String is
D_Img : constant String := Duration'Image (D);
K : constant Natural := Strings.Fixed.Index (D_Img, ".");
Last : constant Positive := Positive'Min (K + Aft, D_Img'Last);
begin
if K = 0 then
return D_Img (D_Img'First + 1 .. D_Img'Last);
else
return D_Img (D_Img'First + 1 .. Last);
end if;
end Image;
------------------
-- Is_Directory --
------------------
function Is_Directory (Filename : String) return Boolean is
begin
return Directories.Exists (Filename)
and then Directories.Kind (Filename) = Directories.Directory;
end Is_Directory;
---------------
-- Is_Number --
---------------
function Is_Number
(S : String;
Allow_Negative : Boolean := False) return Boolean
is
use Strings.Maps;
Start : Positive := S'First;
begin
if Allow_Negative and then S'Length > 1 and then S (Start) = '-' then
Start := S'First + 1;
end if;
return S'Length > 0
and then Is_Subset
(To_Set (S (Start .. S'Last)), Constants.Decimal_Digit_Set);
end Is_Number;
---------------------
-- Is_Regular_File --
---------------------
function Is_Regular_File (Filename : String) return Boolean is
begin
return Directories.Exists (Filename)
and then Directories.Kind (Filename) = Directories.Ordinary_File;
end Is_Regular_File;
------------------------
-- Is_Valid_HTTP_Date --
------------------------
function Is_Valid_HTTP_Date (HTTP_Date : String) return Boolean is
Mask : constant String := "Aaa, 99 Aaa 9999 99:99:99 GMT";
Offset : constant Integer := HTTP_Date'First - 1;
-- Make sure the function works for inputs with 'First <> 1
Result : Boolean := True;
begin
for I in Mask'Range loop
Result := I + Offset in HTTP_Date'Range;
exit when not Result;
case Mask (I) is
when 'A' =>
Result := HTTP_Date (I + Offset) in 'A' .. 'Z';
when 'a' =>
Result := HTTP_Date (I + Offset) in 'a' .. 'z';
when '9' =>
Result := HTTP_Date (I + Offset) in '0' .. '9';
when others =>
Result := Mask (I) = HTTP_Date (I + Offset);
end case;
end loop;
return Result;
end Is_Valid_HTTP_Date;
-------------------
-- Is_Valid_UTF8 --
-------------------
function Is_Valid_UTF8
(Str : Aux.Big_String_Access; Last : Natural) return Boolean
is
-- Code points
subtype CP1 is Character
range Character'Val (16#00#) .. Character'Val (16#7F#);
subtype CP2 is Character
range Character'Val (16#C2#) .. Character'Val (16#DF#);
subtype CP3 is Character
range Character'Val (16#E0#) .. Character'Val (16#EF#);
subtype CP4 is Character
range Character'Val (16#F0#) .. Character'Val (16#F4#);
C80 : constant Character := Character'Val (16#80#);
C8F : constant Character := Character'Val (16#8F#);
C90 : constant Character := Character'Val (16#90#);
C9F : constant Character := Character'Val (16#9F#);
CA0 : constant Character := Character'Val (16#A0#);
CBF : constant Character := Character'Val (16#BF#);
procedure Read_C
(C : in out Positive;
Res : in out Boolean;
R_From, R_Last : Character)
with Inline;
-- Read a single character, check that it is in the range
-- R_From .. R_Last and set Res accordingly. This routine moves C
-- to the next character then.
procedure Read_S2 (C : in out Positive; Res : in out Boolean)
with Inline;
-- Read an UTF-8 character with 2 bytes sequence
procedure Read_S3 (C : in out Positive; Res : in out Boolean)
with Inline;
-- Read an UTF-8 character with 3 bytes sequence
procedure Read_S4 (C : in out Positive; Res : in out Boolean)
with Inline;
-- Read an UTF-8 character with 4 bytes sequence
------------
-- Read_C --
------------
procedure Read_C
(C : in out Positive;
Res : in out Boolean;
R_From, R_Last : Character) is
begin
if Res
and then C < Last
and then Str (C + 1) in R_From .. R_Last
then
C := C + 1;
Res := True;
else
Res := False;
end if;
end Read_C;
-------------
-- Read_S2 --
-------------
procedure Read_S2 (C : in out Positive; Res : in out Boolean) is
begin
Read_C (C, Res, C80, CBF);
end Read_S2;
-------------
-- Read_S3 --
-------------
procedure Read_S3 (C : in out Positive; Res : in out Boolean) is
CE0 : constant Character := Character'Val (16#E0#);
CED : constant Character := Character'Val (16#ED#);
begin
case Str (C) is
when CE0 =>
Read_C (C, Res, CA0, CBF);
when CED =>
Read_C (C, Res, C80, C9F);
when others =>
Read_C (C, Res, C80, CBF);
end case;
Read_C (C, Res, C80, CBF);
end Read_S3;
-------------
-- Read_S4 --
-------------
procedure Read_S4 (C : in out Positive; Res : in out Boolean) is
CF0 : constant Character := Character'Val (16#F0#);
CF4 : constant Character := Character'Val (16#F4#);
begin
case Str (C) is
when CF0 =>
Read_C (C, Res, C90, CBF);
when CF4 =>
Read_C (C, Res, C80, C8F);
when others =>
Read_C (C, Res, C80, CBF);
end case;
Read_C (C, Res, C80, CBF);
Read_C (C, Res, C80, CBF);
end Read_S4;
C : Positive := 1;
R : Boolean := True;
begin
while R and then C <= Last loop
case Str (C) is
when CP1 => null;
when CP2 => Read_S2 (C, R);
when CP3 => Read_S3 (C, R);
when CP4 => Read_S4 (C, R);
when others => return False;
end case;
C := C + 1;
end loop;
return R;
end Is_Valid_UTF8;
function Is_Valid_UTF8 (Value : Unbounded_String) return Boolean is
Str : Aux.Big_String_Access;
Last : Natural;
begin
Aux.Get_String (Value, Str, Last);
return Is_Valid_UTF8 (Str, Last);
end Is_Valid_UTF8;
function Is_Valid_UTF8 (Value : String) return Boolean is
X : aliased Aux.Big_String;
for X'Address use Value'Address;
Str : constant Aux.Big_String_Access := X'Unchecked_Access;
begin
return Is_Valid_UTF8 (Str, Value'Last);
end Is_Valid_UTF8;
------------------
-- Local_To_GMT --
------------------
function Local_To_GMT (DT : Calendar.Time) return Calendar.Time is
use Ada.Calendar;
begin
return DT - Duration (Time_Zones.UTC_Time_Offset (DT)) * 60;
end Local_To_GMT;
-------------
-- Mailbox --
-------------
package body Mailbox_G is
protected body Mailbox is
---------
-- Add --
---------
entry Add (M : Message) when Current_Size < Max_Size is
begin
Current_Size := Current_Size + 1;
Current := Current + 1;
if Current > Max_Size then
Current := Buffer'First;
end if;
Buffer (Current) := M;
end Add;
---------
-- Get --
---------
entry Get (M : out Message) when Current_Size > 0 is
begin
Current_Size := Current_Size - 1;
Last := Last + 1;
if Last > Max_Size then
Last := Buffer'First;
end if;
M := Buffer (Last);
end Get;
procedure Get (M : out Message; Success : out Boolean) is
begin
Success := Current_Size > 0;
if not Success then
return;
end if;
Current_Size := Current_Size - 1;
Last := Last + 1;
if Last > Max_Size then
Last := Buffer'First;
end if;
M := Buffer (Last);
end Get;
----------
-- Size --
----------
function Size return Natural is
begin
return Current_Size;
end Size;
end Mailbox;
end Mailbox_G;
-----------
-- Match --
-----------
function Match (Str, Pattern : String) return Boolean is
use Ada.Characters;
U_Str : constant String := Handling.To_Upper (Str);
U_Pattern : constant String := Handling.To_Upper (Pattern);
begin
return Pattern'Length <= Str'Length
and then U_Str (1 .. Pattern'Length) = U_Pattern;
end Match;
---------------------
-- Normalize_Lower --
---------------------
function Normalize_Lower
(Name : String;
To_Lower : Boolean) return String is
begin
if To_Lower then
return Characters.Handling.To_Lower (Name);
else
return Name;
end if;
end Normalize_Lower;
--------------------------
-- Normalized_Directory --
--------------------------
function Normalized_Directory (Directory : String) return String is
begin
if Directory'Length = 0
or else Directory (Directory'Last) = '/'
or else Directory (Directory'Last) = '\'
then
return Directory;
else
return Directory & OS_Lib.Directory_Separator;
end if;
end Normalized_Directory;
-----------
-- Quote --
-----------
function Quote
(Str : String; Replace : String := """") return String
is
function Replace_Quote (Source : String) return String;
-------------------
-- Replace_Quote --
-------------------
function Replace_Quote (Source : String) return String is
use Ada.Strings.Fixed;
Idx : Natural;
begin
Idx := Index (Source, """");
if Idx = 0 then
return Source;
else
return Source (Source'First .. Idx - 1) & Replace
& Replace_Quote (Source (Idx + 1 .. Source'Last));
end if;
end Replace_Quote;
begin
if Replace'Length = 1 then
-- When length of replace string is 1, we could replace it faster
if Replace (Replace'First) = '"' then
-- Do not need to replace
return '"' & Str & '"';
else
declare
Result : String (Str'Range);
begin
for J in Str'Range loop
if Str (J) = '"' then
Result (J) := Replace (Replace'First);
else
Result (J) := Str (J);
end if;
end loop;
return '"' & Result & '"';
end;
end if;
else
return '"' & Replace_Quote (Str) & '"';
end if;
end Quote;
------------
-- Random --
------------
function Random return Random_Integer is
begin
return Shared_Random.Generate;
end Random;
------------------
-- Random_Reset --
------------------
procedure Random_Reset (Seed : Integer) is
begin
Shared_Random.Reset (Seed);
end Random_Reset;
-------------------
-- Random_String --
-------------------
procedure Random_String (Item : out String) is
Chars : constant String
:= "0123456789abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ";
Rand : Random_Integer := 0;
begin
for Elem of Item loop
if Rand = 0 then
Rand := Random;
end if;
Elem := Chars (Integer (Rand rem Chars'Length) + 1);
Rand := Rand / Chars'Length;
end loop;
end Random_String;
function Random_String (Length : Natural) return String is
Result : String (1 .. Length);
begin
Random_String (Result);
return Result;
end Random_String;
------------------
-- RW_Semaphore --
------------------
protected body RW_Semaphore is
----------
-- Read --
----------
entry Read when W = 0 and then RW_Semaphore.Write'Count = 0 is
begin
R := R + 1;
end Read;
------------------
-- Release_Read --
------------------
procedure Release_Read is
begin
R := R - 1;
end Release_Read;
-------------------
-- Release_Write --
-------------------
procedure Release_Write is
begin
W := W - 1;
end Release_Write;
-----------
-- Write --
-----------
entry Write when R = 0 and then W < Writers is
begin
W := W + 1;
end Write;
end RW_Semaphore;
---------------
-- Semaphore --
---------------
protected body Semaphore is
-------------
-- Release --
-------------
procedure Release is
begin
if TID = Current_Task then
Seized := Seized - 1;
else
raise Tasking_Error;
end if;
end Release;
-----------
-- Seize --
-----------
entry Seize when True is
begin
if Seized = 0 or else Seize'Caller = TID then
Seized := Seized + 1;
TID := Seize'Caller;
else
requeue Seize_Internal with abort;
end if;
end Seize;
--------------------
-- Seize_Internal --
--------------------
entry Seize_Internal when Seized = 0 is
begin
Seized := Seized + 1;
TID := Seize_Internal'Caller;
end Seize_Internal;
end Semaphore;
-------------------
-- Shared_Random --
-------------------
protected body Shared_Random is
--------------
-- Generate --
--------------
function Generate return Random_Integer is
begin
return Integer_Random.Random (Random_Generator);
end Generate;
-----------
-- Reset --
-----------
procedure Reset is
begin
Integer_Random.Reset (Random_Generator);
end Reset;
procedure Reset (Seed : Integer) is
begin
Integer_Random.Reset (Random_Generator, Seed);
end Reset;
end Shared_Random;
-----------------------
-- Significant_Image --
-----------------------
function Significant_Image
(Item : Duration; N : Positive) return String
is
type Largest_Integer is range System.Min_Int .. System.Max_Int;
package LIO is new Text_IO.Integer_IO (Largest_Integer);
package Duration_IO is new Text_IO.Fixed_IO (Duration);
function Log_10 return Long_Float;
AI : constant Long_Float := abs Long_Float (Item);
------------
-- Log_10 --
------------
function Log_10 return Long_Float is
begin
if Item = 0.0 then
return 0.0;
else
return Numerics.Long_Elementary_Functions.Log (AI, 10.0);
end if;
end Log_10;
L10 : constant Long_Float := Log_10;
L10T : constant Long_Float := Long_Float'Truncation (L10);
PP : constant Integer := Integer (L10T);
Aft : constant Natural :=
Integer'Max
(N - PP - Boolean'Pos (AI >= 1.0 or else L10 = L10T), 0);
Img : String (1 .. Integer'Max (PP, 1) + Aft + 1 + Boolean'Pos (Aft > 0)
+ Boolean'Pos (AI >= 10.0)
+ Boolean'Pos (Item < 0.0));
begin
if Aft = 0 then
LIO.Put (Img, Largest_Integer (Item));
else
Duration_IO.Put (Img, Item, Aft => Aft);
end if;
if Img (1) = ' ' then
return Img (2 .. Img'Last);
elsif Img (Img'Last) = '0'
and then (Img (1) = '1' or else Img (1 .. 2) = "-1")
then
declare
Last : Natural := Img'Last;
begin
if Aft > 0 then
Last := Last - 1;
if Img (Last) = '.' then
Last := Last - 1;
end if;
end if;
return Img (1 .. Last);
end;
else
raise Constraint_Error with
Duration'Image (Item) & Integer'Image (N);
end if;
end Significant_Image;
------------------
-- Test_And_Set --
------------------
protected body Test_And_Set is
------------
-- Locked --
------------
function Locked return Boolean is
begin
return Flag;
end Locked;
--------------
-- Try_Lock --
--------------
procedure Try_Lock (Succeeded : out Boolean) is
begin
Succeeded := not Flag;
if Succeeded then
Flag := True;
end if;
end Try_Lock;
------------
-- Unlock --
------------
procedure Unlock is
begin
Flag := False;
end Unlock;
end Test_And_Set;
---------------
-- Time_Zone --
---------------
function Time_Zone return Time_Zone_String is
subtype String2 is String (1 .. 2);
function Image2 (N : Natural) return String2;
-- Returns N's image padded with a leading 0 if needed
--
------------
-- Image2 --
------------
function Image2 (N : Natural) return String2 is
Ni : constant String := Image (N);
begin
if Ni'Length = 2 then
return Ni;
else
return '0' & Ni;
end if;
end Image2;
use type Calendar.Time_Zones.Time_Offset;
TZ : constant Calendar.Time_Zones.Time_Offset :=
Calendar.Time_Zones.UTC_Time_Offset;
ATZ : constant Calendar.Time_Zones.Time_Offset := abs TZ;
H, M : Natural;
begin
if TZ = 0 then
return "";
else
H := Natural (ATZ) / 60;
M := Natural (ATZ) rem 60;
if TZ >= 0 then
return "+" & Image2 (H) & Image2 (M);
else
return "-" & Image2 (H) & Image2 (M);
end if;
end if;
end Time_Zone;
begin
Shared_Random.Reset;
end AWS.Utils;
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