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