usr.sbin/ppp/ua.h

   1 /*-
   2  * Copyright (c) 1998 Brian Somers <brian@Awfulhak.org>
   3  * All rights reserved.
   4  *
   5  * Redistribution and use in source and binary forms, with or without
   6  * modification, are permitted provided that the following conditions
   7  * are met:
   8  * 1. Redistributions of source code must retain the above copyright
   9  *    notice, this list of conditions and the following disclaimer.
  10  * 2. Redistributions in binary form must reproduce the above copyright
  11  *    notice, this list of conditions and the following disclaimer in the
  12  *    documentation and/or other materials provided with the distribution.
  13  *
  14  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
  15  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  16  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  17  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
  18  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  19  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  20  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  21  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  22  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  23  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  24  * SUCH DAMAGE.
  25  *
  26  * $FreeBSD$
  27  */
  28
  29 #ifdef __i386__         /* Do any other archs not care about alignment ? */
  30
  31 #  define ua_htonl(src, tgt) (*(u_int32_t *)(tgt) = htonl(*(u_int32_t *)(src)))
  32 #  define ua_ntohl(src, tgt) (*(u_int32_t *)(tgt) = ntohl(*(u_int32_t *)(src)))
  33 #  define ua_htons(src, tgt) (*(u_int16_t *)(tgt) = htons(*(u_int16_t *)(src)))
  34 #  define ua_ntohs(src, tgt) (*(u_int16_t *)(tgt) = ntohs(*(u_int16_t *)(src)))
  35
  36 #else   /* We care about alignment (or else drop a core !) */
  37
  38 #  define ua_htonl(src, tgt)                            \
  39     do {                                                \
  40       u_int32_t __oh;                                   \
  41       memcpy(&__oh, (src), sizeof __oh);                \
  42       *(u_char *)(tgt) = __oh >> 24;                    \
  43       *((u_char *)(tgt) + 1) = (__oh >> 16) & 0xff;     \
  44       *((u_char *)(tgt) + 2) = (__oh >> 8) & 0xff;      \
  45       *((u_char *)(tgt) + 3) = __oh & 0xff;             \
  46     } while (0)
  47
  48 #  define ua_ntohl(src, tgt)                            \
  49     do {                                                \
  50       u_int32_t __nh;                                   \
  51       __nh = ((u_int32_t)*(u_char *)(src) << 24) |      \
  52           ((u_int32_t)*((u_char *)(src) + 1) << 16) |   \
  53           ((u_int32_t)*((u_char *)(src) + 2) << 8) |    \
  54           (u_int32_t)*((u_char *)(src) + 3);            \
  55       memcpy((tgt), &__nh, sizeof __nh);                \
  56     } while (0)
  57
  58 #  define ua_htons(src, tgt)                            \
  59     do {                                                \
  60       u_int16_t __oh;                                   \
  61       memcpy(&__oh, (src), sizeof __oh);                \
  62       *(u_char *)(tgt) = __oh >> 8;                     \
  63       *((u_char *)(tgt) + 1) = __oh & 0xff;             \
  64     } while (0)
  65
  66 #  define ua_ntohs(src, tgt)                            \
  67     do {                                                \
  68       u_int16_t __nh;                                   \
  69       __nh = ((u_int16_t)*(u_char *)(src) << 8) |       \
  70           (u_int16_t)*((u_char *)(src) + 1);            \
  71       memcpy((tgt), &__nh, sizeof __nh);                \
  72     } while (0)
  73
  74 #endif