lbbs/src/ip_mask.c

/* SPDX-License-Identifier: GPL-3.0-or-later */
/*
 * ip_mask
 *   - IP address mask
 *
 * Copyright (C) 2004-2025 by Leaflet <leaflet@leafok.com>
 */

#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	/* SPDX-License-Identifier: GPL-3.0-or-later */
2	/*
3	* ip_mask
4	* - IP address mask
5	*
6	* Copyright (C) 2004-2025 by Leaflet <leaflet@leafok.com>
7	*/
8
9	#include "ip_mask.h"
10	#include <string.h>
11
12	const char ip_mask(char s, int level, char mask)
13	{
14	char *p = s;
15
16	if (level <= 0)
17	{
18	return s;
19	}
20	if (level > 4)
21	{
22	level = 4;
23	}
24
25	for (int i = 0; i < 4 - level; i++)
26	{
27	p = strchr(p, '.');
28	if (p == NULL)
29	{
30	return s;
31	}
32	p++;
33	}
34
35	for (int i = 0; i < level; i++)
36	{
37	*p = mask;
38	p++;
39	if (i < level - 1)
40	{
41	*p = '.';
42	p++;
43	}
44	}
45	*p = '\0';
46
47	return s;
48	}
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