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      1 /*
      2  * CDDL HEADER START
      3  *
      4  * The contents of this file are subject to the terms of the
      5  * Common Development and Distribution License (the "License").
      6  * You may not use this file except in compliance with the License.
      7  *
      8  * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
      9  * or http://www.opensolaris.org/os/licensing.
     10  * See the License for the specific language governing permissions
     11  * and limitations under the License.
     12  *
     13  * When distributing Covered Code, include this CDDL HEADER in each
     14  * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
     15  * If applicable, add the following below this CDDL HEADER, with the
     16  * fields enclosed by brackets "[]" replaced with your own identifying
     17  * information: Portions Copyright [yyyy] [name of copyright owner]
     18  *
     19  * CDDL HEADER END
     20  */
     21 /*
     22  * Copyright 2008 Sun Microsystems, Inc.  All rights reserved.
     23  * Use is subject to license terms.
     24  */
     25 
     26 #include <sys/types.h>
     27 #include <netinet/in.h>
     28 
     29 /*
     30  * htonll(), ntohll(), htonl(), ntohl(), htons(), ntohs()
     31  *
     32  * On little endian machines these functions reverse the byte order of the
     33  * input parameter and returns the result.  This is to convert the byte order
     34  * from host byte order (little endian) to network byte order (big endian),
     35  * or vice versa.
     36  *
     37  * On big endian machines these functions just return the input parameter,
     38  * as the host byte order is the same as the network byte order (big endian).
     39  */
     40 
     41 
     42 #ifdef	_LITTLE_ENDIAN
     43 uint64_t
     44 htonll(uint64_t in)
     45 {
     46 	return ((uint64_t)htonl((in >> 32) & 0xffffffff) |
     47 	    ((uint64_t)htonl(in & 0xffffffff) << 32));
     48 }
     49 
     50 uint64_t
     51 ntohll(uint64_t in)
     52 {
     53 	return ((uint64_t)ntohl((in >> 32) & 0xffffffff) |
     54 	    ((uint64_t)ntohl(in & 0xffffffff) << 32));
     55 }
     56 
     57 uint32_t
     58 htonl(uint32_t in)
     59 {
     60 	uint32_t	i;
     61 
     62 	i = (uint32_t)((in & (uint32_t)0xff000000) >> 24) +
     63 	    (uint32_t)((in & (uint32_t)0x00ff0000) >> 8) +
     64 	    (uint32_t)((in & (uint32_t)0x0000ff00) << 8) +
     65 	    (uint32_t)((in & (uint32_t)0x000000ff) << 24);
     66 	return (i);
     67 }
     68 
     69 uint32_t
     70 ntohl(uint32_t in)
     71 {
     72 	return (htonl(in));
     73 }
     74 
     75 uint16_t
     76 htons(uint16_t in)
     77 {
     78 	register int arg = (int)in;
     79 	uint16_t i;
     80 
     81 	i = (uint16_t)(((arg & 0xff00) >> 8) & 0xff);
     82 	i |= (uint16_t)((arg & 0xff) << 8);
     83 	return ((uint16_t)i);
     84 }
     85 
     86 uint16_t
     87 ntohs(uint16_t in)
     88 {
     89 	return (htons(in));
     90 }
     91 
     92 #else	/* _LITTLE_ENDIAN */
     93 
     94 #if defined(lint)
     95 uint64_t
     96 htonll(uint64_t in)
     97 {
     98 	return (in);
     99 }
    100 
    101 uint64_t
    102 ntohll(uint64_t in)
    103 {
    104 	return (in);
    105 }
    106 
    107 uint32_t
    108 htonl(uint32_t in)
    109 {
    110 	return (in);
    111 }
    112 
    113 uint32_t
    114 ntohl(uint32_t in)
    115 {
    116 	return (in);
    117 }
    118 
    119 uint16_t
    120 htons(uint16_t in)
    121 {
    122 	return (in);
    123 }
    124 
    125 uint16_t
    126 ntohs(uint16_t in)
    127 {
    128 	return (in);
    129 }
    130 
    131 #endif	/* lint */
    132 #endif	/* _LITTLE_ENDIAN */
    133