diff options
Diffstat (limited to 'bdb/clib/memmove.c')
| -rw-r--r-- | bdb/clib/memmove.c | 155 |
1 files changed, 0 insertions, 155 deletions
diff --git a/bdb/clib/memmove.c b/bdb/clib/memmove.c deleted file mode 100644 index 632d50788da..00000000000 --- a/bdb/clib/memmove.c +++ /dev/null @@ -1,155 +0,0 @@ -/*- - * See the file LICENSE for redistribution information. - * - * Copyright (c) 1996-2002 - * Sleepycat Software. All rights reserved. - */ -/* - * Copyright (c) 1990, 1993 - * The Regents of the University of California. All rights reserved. - * - * Redistribution and use in source and binary forms, with or without - * modification, are permitted provided that the following conditions - * are met: - * 1. Redistributions of source code must retain the above copyright - * notice, this list of conditions and the following disclaimer. - * 2. Redistributions in binary form must reproduce the above copyright - * notice, this list of conditions and the following disclaimer in the - * documentation and/or other materials provided with the distribution. - * 3. Neither the name of the University nor the names of its contributors - * may be used to endorse or promote products derived from this software - * without specific prior written permission. - * - * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND - * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE - * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE - * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE - * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL - * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS - * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) - * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT - * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY - * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF - * SUCH DAMAGE. - */ - -#include "db_config.h" - -#ifndef lint -static const char revid[] = "$Id: memmove.c,v 11.6 2002/01/11 15:51:28 bostic Exp $"; -#endif /* not lint */ - -#ifndef NO_SYSTEM_INCLUDES -#include <sys/types.h> -#endif - -/* - * sizeof(word) MUST BE A POWER OF TWO - * SO THAT wmask BELOW IS ALL ONES - */ -typedef int word; /* "word" used for optimal copy speed */ - -#undef wsize -#define wsize sizeof(word) -#undef wmask -#define wmask (wsize - 1) - -/* - * Copy a block of memory, handling overlap. - * This is the routine that actually implements - * (the portable versions of) bcopy, memcpy, and memmove. - */ -#ifdef MEMCOPY -/* - * PUBLIC: #ifndef HAVE_MEMCPY - * PUBLIC: void *memcpy __P((void *, const void *, size_t)); - * PUBLIC: #endif - */ -void * -memcpy(dst0, src0, length) -#else -#ifdef MEMMOVE -/* - * PUBLIC: #ifndef HAVE_MEMMOVE - * PUBLIC: void *memmove __P((void *, const void *, size_t)); - * PUBLIC: #endif - */ -void * -memmove(dst0, src0, length) -#else -void -bcopy(src0, dst0, length) -#endif -#endif - void *dst0; - const void *src0; - register size_t length; -{ - register char *dst = dst0; - register const char *src = src0; - register size_t t; - - if (length == 0 || dst == src) /* nothing to do */ - goto done; - - /* - * Macros: loop-t-times; and loop-t-times, t>0 - */ -#undef TLOOP -#define TLOOP(s) if (t) TLOOP1(s) -#undef TLOOP1 -#define TLOOP1(s) do { s; } while (--t) - - if ((unsigned long)dst < (unsigned long)src) { - /* - * Copy forward. - */ - t = (int)src; /* only need low bits */ - if ((t | (int)dst) & wmask) { - /* - * Try to align operands. This cannot be done - * unless the low bits match. - */ - if ((t ^ (int)dst) & wmask || length < wsize) - t = length; - else - t = wsize - (t & wmask); - length -= t; - TLOOP1(*dst++ = *src++); - } - /* - * Copy whole words, then mop up any trailing bytes. - */ - t = length / wsize; - TLOOP(*(word *)dst = *(word *)src; src += wsize; dst += wsize); - t = length & wmask; - TLOOP(*dst++ = *src++); - } else { - /* - * Copy backwards. Otherwise essentially the same. - * Alignment works as before, except that it takes - * (t&wmask) bytes to align, not wsize-(t&wmask). - */ - src += length; - dst += length; - t = (int)src; - if ((t | (int)dst) & wmask) { - if ((t ^ (int)dst) & wmask || length <= wsize) - t = length; - else - t &= wmask; - length -= t; - TLOOP1(*--dst = *--src); - } - t = length / wsize; - TLOOP(src -= wsize; dst -= wsize; *(word *)dst = *(word *)src); - t = length & wmask; - TLOOP(*--dst = *--src); - } -done: -#if defined(MEMCOPY) || defined(MEMMOVE) - return (dst0); -#else - return; -#endif -} |