1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
|
------------------------------------------------------------------------------
-- --
-- GNAT RUN-TIME COMPONENTS --
-- --
-- A D A . C O M M A N D _ L I N E --
-- --
-- S p e c --
-- --
-- $Revision$
-- --
-- Copyright (C) 1992-2002 Free Software Foundation, Inc. --
-- --
-- This specification is derived from the Ada Reference Manual for use with --
-- GNAT. The copyright notice above, and the license provisions that follow --
-- apply solely to the contents of the part following the private keyword. --
-- --
-- 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 2, 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. See the GNU General Public License --
-- for more details. You should have received a copy of the GNU General --
-- Public License distributed with GNAT; see file COPYING. If not, write --
-- to the Free Software Foundation, 59 Temple Place - Suite 330, Boston, --
-- MA 02111-1307, USA. --
-- --
-- As a special exception, if other files instantiate generics from this --
-- unit, or you link this unit with other files to produce an executable, --
-- this unit does not by itself cause the resulting executable to be --
-- covered by the GNU General Public License. This exception does not --
-- however invalidate any other reasons why the executable file might be --
-- covered by the GNU Public License. --
-- --
-- GNAT was originally developed by the GNAT team at New York University. --
-- It is now maintained by Ada Core Technologies Inc (http://www.gnat.com). --
-- --
------------------------------------------------------------------------------
package Ada.Command_Line is
pragma Preelaborate (Command_Line);
function Argument_Count return Natural;
-- If the external execution environment supports passing arguments to a
-- program, then Argument_Count returns the number of arguments passed to
-- the program invoking the function. Otherwise it return 0.
--
-- In GNAT: Corresponds to (argc - 1) in C.
function Argument (Number : Positive) return String;
-- If the external execution environment supports passing arguments to
-- a program, then Argument returns an implementation-defined value
-- corresponding to the argument at relative position Number. If Number
-- is outside the range 1 .. Argument_Count, then Constraint_Error is
-- propagated.
--
-- in GNAT: Corresponds to argv [n] (for n > 0) in C.
function Command_Name return String;
-- If the external execution environment supports passing arguments to
-- a program, then Command_Name returns an implementation-defined value
-- corresponding to the name of the command invoking the program.
-- Otherwise Command_Name returns the null string.
--
-- in GNAT: Corresponds to argv [0] in C.
type Exit_Status is new Integer;
Success : constant Exit_Status;
Failure : constant Exit_Status;
procedure Set_Exit_Status (Code : Exit_Status);
------------------------------------
-- Note on Interface Requirements --
------------------------------------
-- If the main program is in Ada, this package works as specified without
-- any other work than the normal steps of WITH'ing the package and then
-- calling the desired routines.
-- If the main program is not in Ada, then the information must be made
-- available for this package to work correctly. In particular, it is
-- required that the global variable "gnat_argc" contain the number of
-- arguments, and that the global variable "gnat_argv" points to an
-- array of null-terminated strings, the first entry being the command
-- name, and the remaining entries being the command arguments.
-- These correspond to the normal argc/argv variables passed to a C
-- main program, and the following is an example of a complete C main
-- program that stores the required information:
-- main(int argc, char **argv, char **envp)
-- {
-- extern int gnat_argc;
-- extern char **gnat_argv;
-- extern char **gnat_envp;
-- gnat_argc = argc;
-- gnat_argv = argv;
-- gnat_envp = envp;
-- adainit();
-- adamain();
-- adafinal();
-- }
-- The assignment statements ensure that the necessary information is
-- available for finding the command name and command line arguments.
private
Success : constant Exit_Status := 0;
Failure : constant Exit_Status := 1;
-- The following locations support the operation of the package
-- Ada.Command_Line.Remove, whih provides facilities for logically
-- removing arguments from the command line. If one of the remove
-- procedures is called in this unit, then Remove_Args/Remove_Count
-- are set to indicate which arguments are removed. If no such calls
-- have been made, then Remove_Args is null.
Remove_Count : Natural;
-- Number of arguments reflecting removals. Not defined unless
-- Remove_Args is non-null.
type Arg_Nums is array (Positive range <>) of Positive;
type Arg_Nums_Ptr is access Arg_Nums;
-- An array that maps logical argument numbers (reflecting removal)
-- to physical argument numbers (e.g. if the first argument has been
-- removed, but not the second, then Arg_Nums (1) will be set to 2.
Remove_Args : Arg_Nums_Ptr := null;
-- Left set to null if no remove calls have been made, otherwise set
-- to point to an appropriate mapping array. Only the first Remove_Count
-- elements are relevant.
pragma Import (C, Set_Exit_Status, "__gnat_set_exit_status");
end Ada.Command_Line;
|
