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comparison gcc/ada/libgnat/a-comlin.adb @ 111:04ced10e8804

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gcc 7
author kono
date Fri, 27 Oct 2017 22:46:09 +0900
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children 84e7813d76e9
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68:561a7518be6b 111:04ced10e8804
1 ------------------------------------------------------------------------------
2 -- --
3 -- GNAT RUN-TIME COMPONENTS --
4 -- --
5 -- A D A . C O M M A N D _ L I N E --
6 -- --
7 -- B o d y --
8 -- --
9 -- Copyright (C) 1992-2017, Free Software Foundation, Inc. --
10 -- --
11 -- GNAT is free software; you can redistribute it and/or modify it under --
12 -- terms of the GNU General Public License as published by the Free Soft- --
13 -- ware Foundation; either version 3, or (at your option) any later ver- --
14 -- sion. GNAT is distributed in the hope that it will be useful, but WITH- --
15 -- OUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY --
16 -- or FITNESS FOR A PARTICULAR PURPOSE. --
17 -- --
18 -- As a special exception under Section 7 of GPL version 3, you are granted --
19 -- additional permissions described in the GCC Runtime Library Exception, --
20 -- version 3.1, as published by the Free Software Foundation. --
21 -- --
22 -- You should have received a copy of the GNU General Public License and --
23 -- a copy of the GCC Runtime Library Exception along with this program; --
24 -- see the files COPYING3 and COPYING.RUNTIME respectively. If not, see --
25 -- <http://www.gnu.org/licenses/>. --
26 -- --
27 -- GNAT was originally developed by the GNAT team at New York University. --
28 -- Extensive contributions were provided by Ada Core Technologies Inc. --
29 -- --
30 ------------------------------------------------------------------------------
31
32 with System; use System;
33
34 package body Ada.Command_Line is
35
36 function Arg_Count return Natural;
37 pragma Import (C, Arg_Count, "__gnat_arg_count");
38
39 procedure Fill_Arg (A : System.Address; Arg_Num : Integer);
40 pragma Import (C, Fill_Arg, "__gnat_fill_arg");
41
42 function Len_Arg (Arg_Num : Integer) return Integer;
43 pragma Import (C, Len_Arg, "__gnat_len_arg");
44
45 -----------------------
46 -- Local Subprograms --
47 -----------------------
48
49 function Initialized return Boolean;
50 -- Checks to ensure that gnat_argc and gnat_argv have been properly
51 -- initialized. Returns false if not, or if argv / argc are
52 -- unsupported on the target (e.g. VxWorks).
53
54 --------------
55 -- Argument --
56 --------------
57
58 function Argument (Number : Positive) return String is
59 begin
60 if Number > Argument_Count then
61 raise Constraint_Error;
62 end if;
63
64 declare
65 Num : constant Positive :=
66 (if Remove_Args = null then Number else Remove_Args (Number));
67 Arg : aliased String (1 .. Len_Arg (Num));
68 begin
69 Fill_Arg (Arg'Address, Num);
70 return Arg;
71 end;
72 end Argument;
73
74 --------------------
75 -- Argument_Count --
76 --------------------
77
78 function Argument_Count return Natural is
79 begin
80 if not Initialized then
81 -- RM A.15 (11)
82 return 0;
83 end if;
84
85 if Remove_Args = null then
86 return Arg_Count - 1;
87 else
88 return Remove_Count;
89 end if;
90 end Argument_Count;
91
92 -----------------
93 -- Initialized --
94 -----------------
95
96 function Initialized return Boolean is
97 gnat_argv : System.Address;
98 pragma Import (C, gnat_argv, "gnat_argv");
99
100 begin
101 return gnat_argv /= System.Null_Address;
102 end Initialized;
103
104 ------------------
105 -- Command_Name --
106 ------------------
107
108 function Command_Name return String is
109 begin
110 if not Initialized then
111 return "";
112 end if;
113
114 declare
115 Arg : aliased String (1 .. Len_Arg (0));
116
117 begin
118 Fill_Arg (Arg'Address, 0);
119 return Arg;
120 end;
121 end Command_Name;
122
123 end Ada.Command_Line;