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| 1 | sysadm | 1.2 | /* SPDX-License-Identifier: GPL-3.0-or-later */ |
| 2 | /* | ||
| 3 | * ip_mask | ||
| 4 | * - IP address mask | ||
| 5 | * | ||
| 6 | sysadm | 1.3 | * Copyright (C) 2004-2025 Leaflet <leaflet@leafok.com> |
| 7 | sysadm | 1.2 | */ |
| 8 | sysadm | 1.1 | |
| 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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