1 /**************************************************************************************************
2 $Id: getoptstr.c,v 1.11 2005/04/20 16:49:11 bboy Exp $
3
4 Copyright (C) 2002-2005 Don Moore <bboy@bboy.net>
5
6 This program is free software; you can redistribute it and/or modify
7 it under the terms of the GNU General Public License as published by
8 the Free Software Foundation; either version 2 of the License, or
9 (at Your option) any later version.
10
11 This program is distributed in the hope that it will be useful,
12 but WITHOUT ANY WARRANTY; without even the implied warranty of
13 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14 GNU General Public License for more details.
15
16 You should have received a copy of the GNU General Public License
17 along with this program; if not, write to the Free Software
18 Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
19 **************************************************************************************************/
20
21 #include "mydnsutil.h"
22
23
24 /**************************************************************************************************
25 GETOPTSTR
26 Given a list of long opts, constructs the opt string automatically, since I always forget to
27 update it.
28 **************************************************************************************************/
29 char *
getoptstr(struct option const longopts[])30 getoptstr(struct option const longopts[]) {
31 static char *optstr = NULL;
32 char *c;
33 register int n, opts;
34 int optsize = 0;
35
36 /* Count number of options */
37 for (opts = 0; longopts[opts].name; opts++) {
38 optsize += 1 + ((longopts[opts].has_arg == required_argument)
39 ?1
40 :(longopts[opts].has_arg == optional_argument)
41 ?2
42 :0);
43 }
44
45 #if DEBUG_ENABLED
46 Debug(_("Optstring is %d in size with %d elements"), optsize, opts);
47 #endif
48
49 /* Allocate optstr */
50 optstr = REALLOCATE(optstr, optsize + 1, char[]);
51 memset(optstr, 0, optsize + 1);
52
53 /* Build optstr */
54 for (c = optstr, n = 0; n < opts && c - optstr < optsize; n++) {
55 if (longopts[n].val) {
56 *c++ = longopts[n].val;
57 if (longopts[n].has_arg == required_argument)
58 *c++ = ':';
59 else if (longopts[n].has_arg == optional_argument) {
60 *c++ = ':';
61 *c++ = ':';
62 }
63 }
64 }
65 return (optstr);
66 }
67 /*--- getoptstr() -------------------------------------------------------------------------------*/
68
69 /* vi:set ts=3: */
70