contrib/bind-9.5.2/lib/isc/region.c

   1 /*
   2  * Copyright (C) 2004, 2005, 2007  Internet Systems Consortium, Inc. ("ISC")
   3  * Copyright (C) 2002  Internet Software Consortium.
   4  *
   5  * Permission to use, copy, modify, and/or distribute this software for any
   6  * purpose with or without fee is hereby granted, provided that the above
   7  * copyright notice and this permission notice appear in all copies.
   8  *
   9  * THE SOFTWARE IS PROVIDED "AS IS" AND ISC DISCLAIMS ALL WARRANTIES WITH
  10  * REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY
  11  * AND FITNESS.  IN NO EVENT SHALL ISC BE LIABLE FOR ANY SPECIAL, DIRECT,
  12  * INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM
  13  * LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE
  14  * OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR
  15  * PERFORMANCE OF THIS SOFTWARE.
  16  */
  17
  18 /* $Id: region.c,v 1.7 2007/06/19 23:47:17 tbox Exp $ */
  19
  20 /*! \file */
  21
  22 #include <config.h>
  23
  24 #include <stdlib.h>
  25 #include <string.h>
  26
  27 #include <isc/region.h>
  28 #include <isc/util.h>
  29
  30 int
  31 isc_region_compare(isc_region_t *r1, isc_region_t *r2) {
  32         unsigned int l;
  33         int result;
  34
  35         REQUIRE(r1 != NULL);
  36         REQUIRE(r2 != NULL);
  37
  38         l = (r1->length < r2->length) ? r1->length : r2->length;
  39
  40         if ((result = memcmp(r1->base, r2->base, l)) != 0)
  41                 return ((result < 0) ? -1 : 1);
  42         else
  43                 return ((r1->length == r2->length) ? 0 :
  44                         (r1->length < r2->length) ? -1 : 1);
  45 }