1 /*
2 * Empire - A multi-player, client/server Internet based war game.
3 * Copyright (C) 1986-2021, Dave Pare, Jeff Bailey, Thomas Ruschak,
4 * Ken Stevens, Steve McClure, Markus Armbruster
5 *
6 * Empire 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 3 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, see <http://www.gnu.org/licenses/>.
18 *
19 * ---
20 *
21 * See files README, COPYING and CREDITS in the root of the source
22 * tree for related information and legal notices. It is expected
23 * that future projects/authors will amend these files as needed.
24 *
25 * ---
26 *
27 * onearg.c: Get one argument, or ask if not there
28 *
29 * Known contributors to this file:
30 *
31 */
32
33 #include <config.h>
34
35 #include "prototypes.h"
36
37 int
onearg(char * arg,char * prompt)38 onearg(char *arg, char *prompt)
39 {
40 int n;
41 char buf[1024];
42
43 if (!arg || !*arg) {
44 if (!(arg = getstring(prompt, buf)))
45 return -1;
46 } else
47 make_stale_if_command_arg(arg);
48 n = atoi(arg);
49 if (n < 0)
50 return -1;
51 return n;
52 }
53