michael@0: #if defined(__sun) && !defined(__SVR4)
michael@0: /*-
michael@0:  * Copyright (c) 1990, 1993
michael@0:  *	The Regents of the University of California.  All rights reserved.
michael@0:  *
michael@0:  * This code is derived from software contributed to Berkeley by
michael@0:  * Chris Torek.
michael@0:  *
michael@0:  * Redistribution and use in source and binary forms, with or without
michael@0:  * modification, are permitted provided that the following conditions
michael@0:  * are met:
michael@0:  * 1. Redistributions of source code must retain the above copyright
michael@0:  *    notice, this list of conditions and the following disclaimer.
michael@0:  * 2. Redistributions in binary form must reproduce the above copyright
michael@0:  *    notice, this list of conditions and the following disclaimer in the
michael@0:  *    documentation and/or other materials provided with the distribution.
michael@0:  * 3. ***REMOVED*** - see 
michael@0:  *    ftp://ftp.cs.berkeley.edu/pub/4bsd/README.Impt.License.Change
michael@0:  * 4. Neither the name of the University nor the names of its contributors
michael@0:  *    may be used to endorse or promote products derived from this software
michael@0:  *    without specific prior written permission.
michael@0:  *
michael@0:  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
michael@0:  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
michael@0:  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
michael@0:  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
michael@0:  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
michael@0:  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
michael@0:  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
michael@0:  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
michael@0:  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
michael@0:  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
michael@0:  * SUCH DAMAGE.
michael@0:  */
michael@0: 
michael@0: #if defined(LIBC_SCCS) && !defined(lint)
michael@0: static char sccsid[] = "@(#)bcopy.c	8.1 (Berkeley) 6/4/93";
michael@0: #endif /* LIBC_SCCS and not lint */
michael@0: 
michael@0: #ifdef HAVE_SYS_CDEFS_H
michael@0: #include <sys/cdefs.h>
michael@0: #else
michael@0: #include "cdefs.h"
michael@0: #endif
michael@0: #include <string.h>
michael@0: 
michael@0: /*
michael@0:  * sizeof(word) MUST BE A POWER OF TWO
michael@0:  * SO THAT wmask BELOW IS ALL ONES
michael@0:  */
michael@0: typedef	int word;		/* "word" used for optimal copy speed */
michael@0: 
michael@0: #define	wsize	sizeof(word)
michael@0: #define	wmask	(wsize - 1)
michael@0: 
michael@0: /*
michael@0:  * Copy a block of memory, handling overlap.
michael@0:  * This is the routine that actually implements
michael@0:  * (the portable versions of) bcopy, memcpy, and memmove.
michael@0:  */
michael@0: #ifdef MEMCOPY
michael@0: void *
michael@0: memcpy(dst0, src0, length)
michael@0: #else
michael@0: #ifdef MEMMOVE
michael@0: void *
michael@0: memmove(dst0, src0, length)
michael@0: #else
michael@0: void
michael@0: bcopy(src0, dst0, length)
michael@0: #endif
michael@0: #endif
michael@0: 	void *dst0;
michael@0: 	const void *src0;
michael@0: 	register size_t length;
michael@0: {
michael@0: 	register char *dst = dst0;
michael@0: 	register const char *src = src0;
michael@0: 	register size_t t;
michael@0: 
michael@0: 	if (length == 0 || dst == src)		/* nothing to do */
michael@0: 		goto done;
michael@0: 
michael@0: 	/*
michael@0: 	 * Macros: loop-t-times; and loop-t-times, t>0
michael@0: 	 */
michael@0: #define	TLOOP(s) if (t) TLOOP1(s)
michael@0: #define	TLOOP1(s) do { s; } while (--t)
michael@0: 
michael@0: 	if ((unsigned long)dst < (unsigned long)src) {
michael@0: 		/*
michael@0: 		 * Copy forward.
michael@0: 		 */
michael@0: 		t = (int)src;	/* only need low bits */
michael@0: 		if ((t | (int)dst) & wmask) {
michael@0: 			/*
michael@0: 			 * Try to align operands.  This cannot be done
michael@0: 			 * unless the low bits match.
michael@0: 			 */
michael@0: 			if ((t ^ (int)dst) & wmask || length < wsize)
michael@0: 				t = length;
michael@0: 			else
michael@0: 				t = wsize - (t & wmask);
michael@0: 			length -= t;
michael@0: 			TLOOP1(*dst++ = *src++);
michael@0: 		}
michael@0: 		/*
michael@0: 		 * Copy whole words, then mop up any trailing bytes.
michael@0: 		 */
michael@0: 		t = length / wsize;
michael@0: 		TLOOP(*(word *)dst = *(word *)src; src += wsize; dst += wsize);
michael@0: 		t = length & wmask;
michael@0: 		TLOOP(*dst++ = *src++);
michael@0: 	} else {
michael@0: 		/*
michael@0: 		 * Copy backwards.  Otherwise essentially the same.
michael@0: 		 * Alignment works as before, except that it takes
michael@0: 		 * (t&wmask) bytes to align, not wsize-(t&wmask).
michael@0: 		 */
michael@0: 		src += length;
michael@0: 		dst += length;
michael@0: 		t = (int)src;
michael@0: 		if ((t | (int)dst) & wmask) {
michael@0: 			if ((t ^ (int)dst) & wmask || length <= wsize)
michael@0: 				t = length;
michael@0: 			else
michael@0: 				t &= wmask;
michael@0: 			length -= t;
michael@0: 			TLOOP1(*--dst = *--src);
michael@0: 		}
michael@0: 		t = length / wsize;
michael@0: 		TLOOP(src -= wsize; dst -= wsize; *(word *)dst = *(word *)src);
michael@0: 		t = length & wmask;
michael@0: 		TLOOP(*--dst = *--src);
michael@0: 	}
michael@0: done:
michael@0: #if defined(MEMCOPY) || defined(MEMMOVE)
michael@0: 	return (dst0);
michael@0: #else
michael@0: 	return;
michael@0: #endif
michael@0: }
michael@0: #endif /* no __sgi */
michael@0: 
michael@0: /* Some compilers don't like an empty source file. */
michael@0: static int dummy = 0;