mirror of
https://github.com/moparisthebest/curl
synced 2024-12-22 08:08:50 -05:00
61 lines
1.6 KiB
C
61 lines
1.6 KiB
C
/*
|
|
* 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 <sys/types.h>
|
|
#include <string.h>
|
|
#include <stdlib.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)
|
|
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
|