source: trunk/ncurses/Ada95/samples/ncurses2-getopt.adb@ 2705

Last change on this file since 2705 was 2621, checked in by bird, 20 years ago

GNU ncurses 5.5
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1------------------------------------------------------------------------------
2-- --
3-- GNAT ncurses Binding Samples --
4-- --
5-- ncurses --
6-- --
7-- B O D Y --
8-- --
9------------------------------------------------------------------------------
10-- Copyright (c) 2000,2004 Free Software Foundation, Inc. --
11-- --
12-- Permission is hereby granted, free of charge, to any person obtaining a --
13-- copy of this software and associated documentation files (the --
14-- "Software"), to deal in the Software without restriction, including --
15-- without limitation the rights to use, copy, modify, merge, publish, --
16-- distribute, distribute with modifications, sublicense, and/or sell --
17-- copies of the Software, and to permit persons to whom the Software is --
18-- furnished to do so, subject to the following conditions: --
19-- --
20-- The above copyright notice and this permission notice shall be included --
21-- in all copies or substantial portions of the Software. --
22-- --
23-- THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS --
24-- OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF --
25-- MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. --
26-- IN NO EVENT SHALL THE ABOVE COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, --
27-- DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR --
28-- OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR --
29-- THE USE OR OTHER DEALINGS IN THE SOFTWARE. --
30-- --
31-- Except as contained in this notice, the name(s) of the above copyright --
32-- holders shall not be used in advertising or otherwise to promote the --
33-- sale, use or other dealings in this Software without prior written --
34-- authorization. --
35------------------------------------------------------------------------------
36-- Author: Eugene V. Melaragno <aldomel@ix.netcom.com> 2000
37-- Version Control
38-- $Revision: 1.6 $
39-- $Date: 2004/08/21 21:37:00 $
40-- Binding Version 01.00
41------------------------------------------------------------------------------
42-- A simplified version of the GNU getopt function
43-- copyright Free Software Foundtion
44
45with Ada.Strings.Fixed;
46with Ada.Strings.Bounded;
47with Ada.Text_IO; use Ada.Text_IO;
48
49package body ncurses2.getopt is
50
51 nextchar : Natural := 0;
52
53 -- Ncurses doesn't use the non option elements so we are spared
54 -- the job of computing those.
55
56 -- also the user is not allowed to modify argv or argc
57 -- Doing so is Erroneous execution.
58
59 -- longoptions are not handled.
60
61 procedure Qgetopt (retval : out Integer;
62 argc : Integer;
63 argv : stringfunc;
64 -- argv will be the Argument function.
65 optstring : String;
66 optind : in out Integer;
67 -- ignored for ncurses, must be initialized to 1 by
68 -- the caller
69 Optarg : out stringa
70 -- a garbage colector would be useful here.
71 ) is
72
73 package BS is new Ada.Strings.Bounded.Generic_Bounded_Length (200);
74 use BS;
75 optargx : Bounded_String;
76 begin
77
78 if argc < optind then
79 retval := -1;
80 return;
81 end if;
82
83 optargx := To_Bounded_String ("");
84
85 if nextchar = 0 then
86
87 if argv (optind) = "--" then
88 -- the rest are non-options, we ignore them
89 retval := -1;
90 return;
91 end if;
92
93 if argv (optind)(1) /= '-' or argv (optind)'Length = 1 then
94 optind := optind + 1;
95 Optarg := new String'(argv (optind));
96 retval := 1;
97 return;
98 end if;
99
100 nextchar := 2; -- skip the one hyphen.
101 end if;
102
103 -- Look at and handle the next short option-character.
104 declare
105 c : Character := argv (optind) (nextchar);
106 temp : constant Natural :=
107 Ada.Strings.Fixed.Index (optstring, String'(1 => c));
108 begin
109 if temp = 0 or c = ':' then
110 Put_Line (Standard_Error,
111 argv (optind) & ": invalid option -- " & c);
112 c := '?';
113 return;
114 end if;
115
116 if optstring (temp + 1) = ':' then
117 if optstring (temp + 2) = ':' then
118 -- This is an option that accepts an argument optionally.
119 if nextchar /= argv (optind)'Length then
120 optargx := To_Bounded_String
121 (argv (optind) (nextchar .. argv (optind)'Length));
122 else
123 Optarg := null;
124 end if;
125 else
126 -- This is an option that requires an argument.
127 if nextchar /= argv (optind)'Length then
128 optargx := To_Bounded_String
129 (argv (optind) (nextchar .. argv (optind)'Length));
130 optind := optind + 1;
131 elsif optind = argc then
132 Put_Line (Standard_Error,
133 argv (optind) &
134 ": option requires an argument -- " & c);
135 if optstring (1) = ':' then
136 c := ':';
137 else
138 c := '?';
139 end if;
140 else
141 -- increment it again when taking next ARGV-elt as argument.
142 optind := optind + 1;
143 optargx := To_Bounded_String (argv (optind));
144 optind := optind + 1;
145 end if;
146 end if;
147 nextchar := 0;
148 else -- no argument for the option
149 if nextchar = argv (optind)'Length then
150 optind := optind + 1;
151 nextchar := 0;
152 else
153 nextchar := nextchar + 1;
154 end if;
155 end if;
156
157 retval := Character'Pos (c);
158 Optarg := new String'(To_String (optargx));
159 return;
160 end;
161 end Qgetopt;
162
163end ncurses2.getopt;
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