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1 ------------------------------------------------------------------------------
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2 -- --
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3 -- GNAT RUN-TIME COMPONENTS --
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4 -- --
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5 -- A D A . C O M M A N D _ L I N E . E N V I R O N M E N T --
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6 -- --
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7 -- B o d y --
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8 -- --
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131
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9 -- Copyright (C) 1996-2018, Free Software Foundation, Inc. --
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111
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10 -- --
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11 -- GNAT is free software; you can redistribute it and/or modify it under --
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12 -- terms of the GNU General Public License as published by the Free Soft- --
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13 -- ware Foundation; either version 3, or (at your option) any later ver- --
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14 -- sion. GNAT is distributed in the hope that it will be useful, but WITH- --
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15 -- OUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY --
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16 -- or FITNESS FOR A PARTICULAR PURPOSE. --
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17 -- --
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18 -- As a special exception under Section 7 of GPL version 3, you are granted --
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19 -- additional permissions described in the GCC Runtime Library Exception, --
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20 -- version 3.1, as published by the Free Software Foundation. --
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21 -- --
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22 -- You should have received a copy of the GNU General Public License and --
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23 -- a copy of the GCC Runtime Library Exception along with this program; --
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24 -- see the files COPYING3 and COPYING.RUNTIME respectively. If not, see --
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25 -- <http://www.gnu.org/licenses/>. --
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26 -- --
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27 -- GNAT was originally developed by the GNAT team at New York University. --
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28 -- Extensive contributions were provided by Ada Core Technologies Inc. --
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29 -- --
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30 ------------------------------------------------------------------------------
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31
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32 with System;
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33
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34 package body Ada.Command_Line.Environment is
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35
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36 -----------------------
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37 -- Environment_Count --
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38 -----------------------
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39
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40 function Environment_Count return Natural is
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41 function Env_Count return Natural;
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42 pragma Import (C, Env_Count, "__gnat_env_count");
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43
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44 begin
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45 return Env_Count;
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46 end Environment_Count;
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47
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48 -----------------------
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49 -- Environment_Value --
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50 -----------------------
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51
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52 function Environment_Value (Number : Positive) return String is
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53 procedure Fill_Env (E : System.Address; Env_Num : Integer);
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54 pragma Import (C, Fill_Env, "__gnat_fill_env");
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55
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56 function Len_Env (Env_Num : Integer) return Integer;
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57 pragma Import (C, Len_Env, "__gnat_len_env");
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58
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59 begin
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60 if Number > Environment_Count then
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61 raise Constraint_Error;
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62 end if;
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63
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64 declare
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65 Env : aliased String (1 .. Len_Env (Number - 1));
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66 begin
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67 Fill_Env (Env'Address, Number - 1);
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68 return Env;
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69 end;
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70 end Environment_Value;
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71
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72 end Ada.Command_Line.Environment;
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