84 lines
3.6 KiB
Ada
84 lines
3.6 KiB
Ada
------------------------------------------------------------------------------
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-- --
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-- GNAT RUN-TIME LIBRARY (GNARL) COMPONENTS --
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-- --
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-- G N A T . B I N D _ E N V I R O N M E N T --
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-- --
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-- B o d y --
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-- --
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-- Copyright (C) 2015, Free Software Foundation, Inc. --
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-- --
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-- GNAT is free software; you can redistribute it and/or modify it under --
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-- terms of the GNU General Public License as published by the Free Soft- --
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-- ware Foundation; either version 3, or (at your option) any later ver- --
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-- sion. GNAT is distributed in the hope that it will be useful, but WITH- --
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-- OUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY --
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-- or FITNESS FOR A PARTICULAR PURPOSE. --
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-- --
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-- As a special exception under Section 7 of GPL version 3, you are granted --
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-- additional permissions described in the GCC Runtime Library Exception, --
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-- version 3.1, as published by the Free Software Foundation. --
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-- --
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-- You should have received a copy of the GNU General Public License and --
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-- a copy of the GCC Runtime Library Exception along with this program; --
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-- see the files COPYING3 and COPYING.RUNTIME respectively. If not, see --
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-- <http://www.gnu.org/licenses/>. --
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-- --
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-- GNARL was developed by the GNARL team at Florida State University. --
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-- Extensive contributions were provided by AdaCore. --
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-- --
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------------------------------------------------------------------------------
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with System;
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package body GNAT.Bind_Environment is
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---------
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-- Get --
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---------
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function Get (Key : String) return String is
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use type System.Address;
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Bind_Env_Addr : System.Address;
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pragma Import (C, Bind_Env_Addr, "__gl_bind_env_addr");
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-- Variable provided by init.c/s-init.ads, and initialized by
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-- the binder generated file.
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Bind_Env : String (Positive);
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for Bind_Env'Address use Bind_Env_Addr;
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pragma Import (Ada, Bind_Env);
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-- Import Bind_Env string from binder file. Note that we import
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-- it here as a string with maximum boundaries. The "real" end
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-- of the string is indicated by a NUL byte.
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Index, KLen, VLen : Integer;
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begin
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if Bind_Env_Addr = System.Null_Address then
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return "";
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end if;
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Index := Bind_Env'First;
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loop
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-- Index points to key length
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VLen := 0;
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KLen := Character'Pos (Bind_Env (Index));
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exit when KLen = 0;
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Index := Index + KLen + 1;
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-- Index points to value length
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VLen := Character'Pos (Bind_Env (Index));
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exit when Bind_Env (Index - KLen .. Index - 1) = Key;
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Index := Index + VLen + 1;
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end loop;
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return Bind_Env (Index + 1 .. Index + VLen);
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end Get;
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end GNAT.Bind_Environment;
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