| |
| /* |
| * Copyright (c) 2004 by Internet Systems Consortium, Inc. ("ISC") |
| * Copyright (c) 1996,1999 by Internet Software Consortium. |
| * |
| * Permission to use, copy, modify, and distribute this software for any |
| * purpose with or without fee is hereby granted, provided that the above |
| * copyright notice and this permission notice appear in all copies. |
| * |
| * THE SOFTWARE IS PROVIDED "AS IS" AND ISC DISCLAIMS ALL WARRANTIES |
| * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF |
| * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL ISC BE LIABLE FOR |
| * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES |
| * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN |
| * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT |
| * OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE. |
| */ |
| |
| #ifndef HAVE_BITNCMP |
| |
| #include "ares_setup.h" |
| #include "bitncmp.h" |
| |
| /* |
| * int |
| * bitncmp(l, r, n) |
| * compare bit masks l and r, for n bits. |
| * return: |
| * -1, 1, or 0 in the libc tradition. |
| * note: |
| * network byte order assumed. this means 192.5.5.240/28 has |
| * 0x11110000 in its fourth octet. |
| * author: |
| * Paul Vixie (ISC), June 1996 |
| */ |
| int |
| ares_bitncmp(const void *l, const void *r, int n) { |
| unsigned int lb, rb; |
| int x, b; |
| |
| b = n / 8; |
| x = memcmp(l, r, b); |
| if (x || (n % 8) == 0) |
| return (x); |
| |
| lb = ((const unsigned char *)l)[b]; |
| rb = ((const unsigned char *)r)[b]; |
| for (b = n % 8; b > 0; b--) { |
| if ((lb & 0x80) != (rb & 0x80)) { |
| if (lb & 0x80) |
| return (1); |
| return (-1); |
| } |
| lb <<= 1; |
| rb <<= 1; |
| } |
| return (0); |
| } |
| #endif |