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(* Environment.mod provides access to the environment settings of a process.
Copyright (C) 2001-2023 Free Software Foundation, Inc.
Contributed by Gaius Mulley <gaius.mulley@southwales.ac.uk>.
This file is part of GNU Modula-2.
GNU Modula-2 is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 3, or (at your option)
any later version.
GNU Modula-2 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
General Public License for more details.
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/>. *)
IMPLEMENTATION MODULE Environment ;
FROM SYSTEM IMPORT ADR ;
FROM libc IMPORT getenv, putenv ;
FROM ASCII IMPORT nul ;
FROM StrLib IMPORT StrCopy ;
(*
GetEnvironment - gets the environment variable Env and places
a copy of its value into string, dest.
It returns TRUE if the string Env was found in
the processes environment.
*)
PROCEDURE GetEnvironment (Env: ARRAY OF CHAR;
VAR dest: ARRAY OF CHAR) : BOOLEAN ;
VAR
High,
i : CARDINAL ;
Addr: POINTER TO CHAR ;
BEGIN
i := 0 ;
High := HIGH (dest) ;
Addr := getenv (ADR (Env)) ;
WHILE (i<High) AND (Addr#NIL) AND (Addr^#nul) DO
dest[i] := Addr^ ;
INC (Addr) ;
INC (i)
END ;
IF i<High
THEN
dest[i] := nul
END ;
RETURN Addr#NIL
END GetEnvironment ;
(*
PutEnvironment - change or add an environment variable definition EnvDef.
TRUE is returned if the environment variable was
set or changed successfully.
*)
PROCEDURE PutEnvironment (EnvDef: ARRAY OF CHAR) : BOOLEAN ;
BEGIN
RETURN putenv (ADR (EnvDef)) = 0
END PutEnvironment ;
END Environment.
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