lbbs/src/ip_mask.c

/***************************************************************************
                                                  ip_mask.c  -  description
                                                         -------------------
        Copyright            : (C) 2004-2025 by Leaflet
        Email                : leaflet@leafok.com
 ***************************************************************************/

/***************************************************************************
 *                                                                         *
 *   This program is free software; you can redistribute it and/or modify  *
 *   it under the terms of the GNU General Public License as published by  *
 *   the Free Software Foundation; either version 3 of the License, or     *
 *   (at your option) any later version.                                   *
 *                                                                         *
 ***************************************************************************/

#include "ip_mask.h"
#include <string.h>

const char *ip_mask(char *s, int level, char mask)
{
        char *p = s;

        if (level <= 0)
        {
                return s;
        }
        if (level > 4)
        {
                level = 4;
        }

        for (int i = 0; i < 4 - level; i++)
        {
                p = strchr(p, '.');
                if (p == NULL)
                {
                        return s;
                }
                p++;
        }

        for (int i = 0; i < level; i++)
        {
                *p = mask;
                p++;
                if (i < level - 1)
                {
                        *p = '.';
                        p++;
                }
        }
        *p = '\0';

        return s;
}
1	sysadm	1.1	/***************************************************************************
2			ip_mask.c - description
3			-------------------
4			Copyright : (C) 2004-2025 by Leaflet
5			Email : leaflet@leafok.com
6			***************************************************************************/
7
8			/***************************************************************************
9			* *
10			* This program is free software; you can redistribute it and/or modify *
11			* it under the terms of the GNU General Public License as published by *
12			* the Free Software Foundation; either version 3 of the License, or *
13			* (at your option) any later version. *
14			* *
15			***************************************************************************/
16
17			#include "ip_mask.h"
18			#include <string.h>
19
20			const char ip_mask(char s, int level, char mask)
21			{
22			char *p = s;
23
24			if (level <= 0)
25			{
26			return s;
27			}
28			if (level > 4)
29			{
30			level = 4;
31			}
32
33			for (int i = 0; i < 4 - level; i++)
34			{
35			p = strchr(p, '.');
36			if (p == NULL)
37			{
38			return s;
39			}
40			p++;
41			}
42
43			for (int i = 0; i < level; i++)
44			{
45			*p = mask;
46			p++;
47			if (i < level - 1)
48			{
49			*p = '.';
50			p++;
51			}
52			}
53			*p = '\0';
54
55			return s;
56			}
webmaster@leafok.com	ViewVC Help
Powered by ViewVC 1.3.0-beta1