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1996-09-28
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------------------------------------------------------------------------------
-- --
-- GNAT COMPILER COMPONENTS --
-- --
-- G N A T . O S _ L I B --
-- --
-- B o d y --
-- --
-- $Revision: 1.27 $ --
-- --
-- Copyright (c) 1992,1993,1994,1995 NYU, All Rights Reserved --
-- --
-- The GNAT library is free software; you can redistribute it and/or modify --
-- it under terms of the GNU Library General Public License as published by --
-- the Free Software Foundation; either version 2, or (at your option) any --
-- later version. The GNAT 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. See the GNU --
-- Library General Public License for more details. You should have --
-- received a copy of the GNU Library General Public License along with --
-- the GNAT library; see the file COPYING.LIB. If not, write to the Free --
-- Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA. --
-- --
------------------------------------------------------------------------------
with Unchecked_Conversion;
with System; use System;
with System.Storage_Elements; use System.Storage_Elements;
package body GNAT.OS_Lib is
-----------------------
-- Local Subprograms --
-----------------------
function C_String_Length (S : Address) return Integer;
-- Returns the length of a C string. Does check for null address
-- (returns 0).
---------------------
-- C_String_Length --
---------------------
function C_String_Length (S : Address) return Integer is
function Strlen (S : Address) return Integer;
pragma Import (C, Strlen, "strlen");
begin
if S = Null_Address then
return 0;
else
return Strlen (S);
end if;
end C_String_Length;
----------------------
-- Create_Temp_File --
----------------------
procedure Create_Temp_File
(FD : out File_Descriptor;
Name : out Temp_File_Name)
is
function Get_Temp_Name (T : Address) return Address;
pragma Import (C, Get_Temp_Name, "mktemp");
Result : Address;
begin
Name := "GNAT-XXXXXX" & Ascii.NUL;
-- Check for NULL pointer returned by C
if Get_Temp_Name (Name'Address) = To_Address (0) then
FD := -1;
else
FD := Create_New_File (Name'Address, Binary);
end if;
end Create_Temp_File;
-----------------
-- Delete_File --
-----------------
procedure Delete_File (Name : Address; Success : out Boolean) is
R : Integer;
function unlink (A : Address) return Integer;
pragma Import (C, unlink, "unlink");
begin
R := unlink (Name);
Success := (R = 0);
end Delete_File;
----------------------
-- File_Time_Stamp --
----------------------
function File_Time_Stamp (FD : File_Descriptor) return OS_Time is
function File_Time (FD : File_Descriptor) return OS_Time;
pragma Import (C, File_Time, "file_time_fd");
begin
return File_Time (FD);
end File_Time_Stamp;
----------------------
-- File_Time_Stamp --
----------------------
function File_Time_Stamp (Name : String) return OS_Time is
function File_Time (Name : Address) return OS_Time;
pragma Import (C, File_Time, "file_time_name");
F_Name : String (1 .. Name'Last + 1);
begin
F_Name (Name'Range) := Name;
F_Name (F_Name'Last) := Ascii.NUL;
return File_Time (F_Name'Address);
end File_Time_Stamp;
------------
-- Getenv --
------------
function Getenv (Name : String) return String_Access is
procedure Get_Env_Value_Ptr (Name, Length, Ptr : Address);
pragma Import (C, Get_Env_Value_Ptr, "get_env_value_ptr");
procedure Strncpy (Astring_Addr, Cstring : Address; N : Integer);
pragma Import (C, Strncpy, "strncpy");
Env_Value_Ptr : Address;
Env_Value_Length : Integer;
F_Name : String (1 .. Name'Last + 1);
Result : String_Access;
begin
F_Name (Name'Range) := Name;
F_Name (F_Name'Last) := Ascii.NUL;
Get_Env_Value_Ptr
(F_Name'Address, Env_Value_Length'Address, Env_Value_Ptr'Address);
Result := new String (1 .. Env_Value_Length);
if Env_Value_Length > 0 then
Strncpy (Result.all'Address, Env_Value_Ptr, Env_Value_Length);
end if;
return Result;
end Getenv;
------------
-- GM_Day --
------------
function GM_Day (Date : OS_Time) return Day_Type is
Y : Year_Type;
Mo : Month_Type;
D : Day_Type;
H : Hour_Type;
Mn : Minute_Type;
S : Second_Type;
begin
GM_Split (Date, Y, Mo, D, H, Mn, S);
return D;
end GM_Day;
-------------
-- GM_Hour --
-------------
function GM_Hour (Date : OS_Time) return Hour_Type is
Y : Year_Type;
Mo : Month_Type;
D : Day_Type;
H : Hour_Type;
Mn : Minute_Type;
S : Second_Type;
begin
GM_Split (Date, Y, Mo, D, H, Mn, S);
return H;
end GM_Hour;
---------------
-- GM_Minute --
---------------
function GM_Minute (Date : OS_Time) return Minute_Type is
Y : Year_Type;
Mo : Month_Type;
D : Day_Type;
H : Hour_Type;
Mn : Minute_Type;
S : Second_Type;
begin
GM_Split (Date, Y, Mo, D, H, Mn, S);
return Mn;
end GM_Minute;
--------------
-- GM_Month --
--------------
function GM_Month (Date : OS_Time) return Month_Type is
Y : Year_Type;
Mo : Month_Type;
D : Day_Type;
H : Hour_Type;
Mn : Minute_Type;
S : Second_Type;
begin
GM_Split (Date, Y, Mo, D, H, Mn, S);
return Mo;
end GM_Month;
---------------
-- GM_Second --
---------------
function GM_Second (Date : OS_Time) return Second_Type is
Y : Year_Type;
Mo : Month_Type;
D : Day_Type;
H : Hour_Type;
Mn : Minute_Type;
S : Second_Type;
begin
GM_Split (Date, Y, Mo, D, H, Mn, S);
return S;
end GM_Second;
--------------
-- GM_Split --
--------------
procedure GM_Split
(Date : OS_Time;
Year : out Year_Type;
Month : out Month_Type;
Day : out Day_Type;
Hour : out Hour_Type;
Minute : out Minute_Type;
Second : out Second_Type)
is
procedure To_GM_Time
(P_Time_T, P_Year, P_Month, P_Day, P_Hours, P_Mins, P_Secs : Address);
pragma Import (C, To_GM_Time, "to_gm_time");
T : OS_Time := Date;
Y : Integer;
Mo : Integer;
D : Integer;
H : Integer;
Mn : Integer;
S : Integer;
begin
To_GM_Time (T'Address, Y'Address, Mo'Address, D'Address, H'Address,
Mn'Address, S'Address);
Year := Y + 1900;
Month := Mo + 1;
Day := D;
Hour := H;
Minute := Mn;
Second := S;
end GM_Split;
-------------
-- GM_Year --
-------------
function GM_Year (Date : OS_Time) return Year_Type is
Y : Year_Type;
Mo : Month_Type;
D : Day_Type;
H : Hour_Type;
Mn : Minute_Type;
S : Second_Type;
begin
GM_Split (Date, Y, Mo, D, H, Mn, S);
return Y;
end GM_Year;
------------------
-- Is_Directory --
------------------
function Is_Directory (Name : String) return Boolean is
function Is_Directory (Name : Address) return Integer;
pragma Import (C, Is_Directory, "is_directory");
F_Name : String (1 .. Name'Last + 1);
begin
F_Name (Name'Range) := Name;
F_Name (F_Name'Last) := Ascii.NUL;
return Is_Directory (F_Name'Address) /= 0;
end Is_Directory;
---------------------
-- Is_Regular_File --
---------------------
function Is_Regular_File (Name : String) return Boolean is
function Is_Regular_File (Name : Address) return Integer;
pragma Import (C, Is_Regular_File, "is_regular_file");
F_Name : String (1 .. Name'Last + 1);
begin
F_Name (Name'Range) := Name;
F_Name (F_Name'Last) := Ascii.NUL;
return Is_Regular_File (F_Name'Address) /= 0;
end Is_Regular_File;
-------------------------
-- Locate_Regular_File --
-------------------------
function Locate_Regular_File
(File_Name : String;
Path : String)
return String_Access
is
function Locate_Exec (Exec_Name, Path_Val : Address) return Address;
pragma Import (C, Locate_Exec, "locate_exec");
-- "historical reasons" for the name of the C function. ???
Exec_Name : String (1 .. File_Name'Length + 1);
Path_Val : String (1 .. Path'Length);
Path_Addr : Address;
Path_Len : Integer;
Return_Val : String_Access;
begin
Exec_Name (1 .. File_Name'Length) := File_Name;
Exec_Name (Exec_Name'Last) := Ascii.NUL;
Path_Val (1 .. Path'Length) := Path;
Path_Val (Path_Val'Last) := Ascii.NUL;
Path_Addr := Locate_Exec (Exec_Name'Address, Path_Val'Address);
Path_Len := C_String_Length (Path_Addr);
if Path_Len = 0 then
return null;
else
Return_Val := new String (1 .. Path_Len);
declare
subtype Path_String is String (1 .. Path_Len);
type Path_String_Access is access Path_String;
function Address_To_Access is new
Unchecked_Conversion (Source => Address,
Target => Path_String_Access);
Path_Access : Path_String_Access := Address_To_Access (Path_Addr);
begin
for J in 1 .. Path_Len loop
Return_Val (J) := Path_Access (J);
end loop;
return Return_Val;
end;
end if;
end Locate_Regular_File;
-----------
-- Spawn --
-----------
procedure Spawn
(Program_Name : String;
Args : Argument_List;
Success : out Boolean)
is
Arg_List : array (1 .. Args'Length + 2) of Address;
Arg : String_Access;
function Portable_Spawn (Args : Address) return Integer;
pragma Import (C, Portable_Spawn, "portable_spawn");
begin
Arg := new String (1 .. Program_Name'Length + 1);
Arg (1 .. Program_Name'Length) := Program_Name;
Arg (Arg'Last) := Ascii.NUL;
Arg_List (1) := Arg.all'Address;
for J in 1 .. Args'Length loop
Arg := new String (1 .. Args (J + Args'First - 1)'Length + 1);
Arg (1 .. Arg'Last - 1) := Args (J + Args'First - 1).all;
Arg (Arg'Last) := Ascii.NUL;
Arg_List (J + 1) := Arg.all'Address;
end loop;
Arg_List (Arg_List'Last) := Null_Address;
if Portable_Spawn (Arg_List'Address) = 0 then
Success := True;
else
Success := False;
end if;
end Spawn;
end GNAT.OS_Lib;