| ------------------------------------------------------------------------------ |
| -- -- |
| -- GNAT RUN-TIME COMPONENTS -- |
| -- -- |
| -- A D A . E N V I R O N M E N T _ V A R I A B L E S -- |
| -- -- |
| -- B o d y -- |
| -- -- |
| -- Copyright (C) 2009-2021, 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 3, 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. -- |
| -- -- |
| -- 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/>. -- |
| -- -- |
| -- GNAT was originally developed by the GNAT team at New York University. -- |
| -- Extensive contributions were provided by Ada Core Technologies Inc. -- |
| -- -- |
| ------------------------------------------------------------------------------ |
| |
| with System.CRTL; |
| with Interfaces.C.Strings; |
| with Ada.Unchecked_Deallocation; |
| |
| package body Ada.Environment_Variables is |
| |
| ----------- |
| -- Clear -- |
| ----------- |
| |
| procedure Clear (Name : String) is |
| procedure Clear_Env_Var (Name : System.Address); |
| pragma Import (C, Clear_Env_Var, "__gnat_unsetenv"); |
| |
| F_Name : String (1 .. Name'Length + 1); |
| |
| begin |
| F_Name (1 .. Name'Length) := Name; |
| F_Name (F_Name'Last) := ASCII.NUL; |
| |
| Clear_Env_Var (F_Name'Address); |
| end Clear; |
| |
| ----------- |
| -- Clear -- |
| ----------- |
| |
| procedure Clear is |
| procedure Clear_Env; |
| pragma Import (C, Clear_Env, "__gnat_clearenv"); |
| begin |
| Clear_Env; |
| end Clear; |
| |
| ------------ |
| -- Exists -- |
| ------------ |
| |
| function Exists (Name : String) return Boolean is |
| use System; |
| |
| procedure Get_Env_Value_Ptr (Name, Length, Ptr : Address); |
| pragma Import (C, Get_Env_Value_Ptr, "__gnat_getenv"); |
| |
| Env_Value_Ptr : aliased Address; |
| Env_Value_Length : aliased Integer; |
| F_Name : aliased String (1 .. Name'Length + 1); |
| |
| begin |
| F_Name (1 .. Name'Length) := Name; |
| F_Name (F_Name'Last) := ASCII.NUL; |
| |
| Get_Env_Value_Ptr |
| (F_Name'Address, Env_Value_Length'Address, Env_Value_Ptr'Address); |
| |
| if Env_Value_Ptr = System.Null_Address then |
| return False; |
| end if; |
| |
| return True; |
| end Exists; |
| |
| ------------- |
| -- Iterate -- |
| ------------- |
| |
| procedure Iterate |
| (Process : not null access procedure (Name, Value : String)) |
| is |
| use Interfaces.C.Strings; |
| type C_String_Array is array (Natural) of aliased chars_ptr; |
| type C_String_Array_Access is access C_String_Array; |
| |
| function Get_Env return C_String_Array_Access; |
| pragma Import (C, Get_Env, "__gnat_environ"); |
| |
| type String_Access is access all String; |
| procedure Free is new Ada.Unchecked_Deallocation (String, String_Access); |
| |
| Env_Length : Natural := 0; |
| Env : constant C_String_Array_Access := Get_Env; |
| |
| begin |
| -- If the environment is null return directly |
| |
| if Env = null then |
| return; |
| end if; |
| |
| -- First get the number of environment variables |
| |
| loop |
| exit when Env (Env_Length) = Null_Ptr; |
| Env_Length := Env_Length + 1; |
| end loop; |
| |
| declare |
| Env_Copy : array (1 .. Env_Length) of String_Access; |
| |
| begin |
| -- Copy the environment |
| |
| for Iterator in 1 .. Env_Length loop |
| Env_Copy (Iterator) := new String'(Value (Env (Iterator - 1))); |
| end loop; |
| |
| -- Iterate on the environment copy |
| |
| for Iterator in 1 .. Env_Length loop |
| declare |
| Current_Var : constant String := Env_Copy (Iterator).all; |
| Value_Index : Natural := Env_Copy (Iterator)'First; |
| |
| begin |
| loop |
| exit when Current_Var (Value_Index) = '='; |
| Value_Index := Value_Index + 1; |
| end loop; |
| |
| Process |
| (Current_Var (Current_Var'First .. Value_Index - 1), |
| Current_Var (Value_Index + 1 .. Current_Var'Last)); |
| end; |
| end loop; |
| |
| -- Free the copy of the environment |
| |
| for Iterator in 1 .. Env_Length loop |
| Free (Env_Copy (Iterator)); |
| end loop; |
| end; |
| end Iterate; |
| |
| --------- |
| -- Set -- |
| --------- |
| |
| procedure Set (Name : String; Value : String) is |
| F_Name : String (1 .. Name'Length + 1); |
| F_Value : String (1 .. Value'Length + 1); |
| |
| procedure Set_Env_Value (Name, Value : System.Address); |
| pragma Import (C, Set_Env_Value, "__gnat_setenv"); |
| |
| begin |
| F_Name (1 .. Name'Length) := Name; |
| F_Name (F_Name'Last) := ASCII.NUL; |
| |
| F_Value (1 .. Value'Length) := Value; |
| F_Value (F_Value'Last) := ASCII.NUL; |
| |
| Set_Env_Value (F_Name'Address, F_Value'Address); |
| end Set; |
| |
| ----------- |
| -- Value -- |
| ----------- |
| |
| function Value (Name : String) return String is |
| use System, System.CRTL; |
| |
| procedure Get_Env_Value_Ptr (Name, Length, Ptr : Address); |
| pragma Import (C, Get_Env_Value_Ptr, "__gnat_getenv"); |
| |
| Env_Value_Ptr : aliased Address; |
| Env_Value_Length : aliased Integer; |
| F_Name : aliased String (1 .. Name'Length + 1); |
| |
| begin |
| F_Name (1 .. Name'Length) := Name; |
| F_Name (F_Name'Last) := ASCII.NUL; |
| |
| Get_Env_Value_Ptr |
| (F_Name'Address, Env_Value_Length'Address, Env_Value_Ptr'Address); |
| |
| if Env_Value_Ptr = System.Null_Address then |
| raise Constraint_Error; |
| end if; |
| |
| if Env_Value_Length > 0 then |
| declare |
| Result : aliased String (1 .. Env_Value_Length); |
| begin |
| strncpy (Result'Address, Env_Value_Ptr, size_t (Env_Value_Length)); |
| return Result; |
| end; |
| else |
| return ""; |
| end if; |
| end Value; |
| |
| function Value (Name : String; Default : String) return String is |
| begin |
| return (if Exists (Name) then Value (Name) else Default); |
| end Value; |
| |
| end Ada.Environment_Variables; |
