external/bsd/bind/dist/lib/isc/region.c

   1 /*      $NetBSD: region.c,v 1.4 2014/12/10 04:37:59 christos Exp $      */
   2
   3 /*
   4  * Copyright (C) 2004, 2005, 2007  Internet Systems Consortium, Inc. ("ISC")
   5  * Copyright (C) 2002  Internet Software Consortium.
   6  *
   7  * Permission to use, copy, modify, and/or distribute this software for any
   8  * purpose with or without fee is hereby granted, provided that the above
   9  * copyright notice and this permission notice appear in all copies.
  10  *
  11  * THE SOFTWARE IS PROVIDED "AS IS" AND ISC DISCLAIMS ALL WARRANTIES WITH
  12  * REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY
  13  * AND FITNESS.  IN NO EVENT SHALL ISC BE LIABLE FOR ANY SPECIAL, DIRECT,
  14  * INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM
  15  * LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE
  16  * OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR
  17  * PERFORMANCE OF THIS SOFTWARE.
  18  */
  19
  20 /* Id: region.c,v 1.7 2007/06/19 23:47:17 tbox Exp  */
  21
  22 /*! \file */
  23
  24 #include <config.h>
  25
  26 #include <stdlib.h>
  27 #include <string.h>
  28
  29 #include <isc/region.h>
  30 #include <isc/util.h>
  31
  32 int
  33 isc_region_compare(isc_region_t *r1, isc_region_t *r2) {
  34         unsigned int l;
  35         int result;
  36
  37         REQUIRE(r1 != NULL);
  38         REQUIRE(r2 != NULL);
  39
  40         l = (r1->length < r2->length) ? r1->length : r2->length;
  41
  42         if ((result = memcmp(r1->base, r2->base, l)) != 0)
  43                 return ((result < 0) ? -1 : 1);
  44         else
  45                 return ((r1->length == r2->length) ? 0 :
  46                         (r1->length < r2->length) ? -1 : 1);
  47 }