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1550c6fef3
parameters (which is by default linked in with libunix.a),
regular expressions can no longer prompt dos.library requesters
to appear. However, to be on the safe side, if you are expecting
to pass regular expressions on the command line, do not use
the wildcard expansion code such as by overriding the library
symbols with dummy functions such as are used in the file
"stdlib_wildcard_expand.c".
- Added a new variable '__open_locale' which can be used to
restrict all library functions to use the "C" language locale
rather than the current system locale settings. In addition
to that, two new functions __locale_exit() and __locale_init()
can be used to close and (re-)open the system locale at a
later time.
- Local ("static") functions are now identified by the STATIC
qualifier. This was done in preparation for changes that will
deal with global and local data and the issue of thread safety.
git-svn-id: file:///Users/olsen/Code/migration-svn-zu-git/logical-line-staging/clib2/trunk@14839 87f5fb63-7c3d-0410-a384-fd976d0f7a62
381 lines
8.6 KiB
C
381 lines
8.6 KiB
C
/*
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* $Id: string_memcpy.c,v 1.6 2005-02-25 10:14:21 obarthel Exp $
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*
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* :ts=4
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*
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* Portable ISO 'C' (1994) runtime library for the Amiga computer
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* Copyright (c) 2002-2005 by Olaf Barthel <olsen@sourcery.han.de>
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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*
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* - Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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*
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* - Neither the name of Olaf Barthel nor the names of contributors
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* may be used to endorse or promote products derived from this
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* software without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
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* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
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* LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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* POSSIBILITY OF SUCH DAMAGE.
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*/
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#ifndef _STDLIB_NULL_POINTER_CHECK_H
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#include "stdlib_null_pointer_check.h"
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#endif /* _STDLIB_NULL_POINTER_CHECK_H */
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/****************************************************************************/
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#ifndef _STRING_HEADERS_H
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#include "string_headers.h"
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#endif /* _STRING_HEADERS_H */
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/****************************************************************************/
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#if (defined(__GNUC__) && defined(__mc68020__) && defined(NDEBUG) && defined(undefined))
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/****************************************************************************/
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asm("
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.text
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.even
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.globl ___bcopy
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___bcopy:
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moveml sp@(4),a0-a1
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movel sp@(12),d0
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movew a0,d1 | Make sure that A0 is long word aligned.
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andiw #3,d1
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beq already_aligned
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notw d1 | This may de-align A1, but that's life.
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andiw #3,d1
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align_loop:
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moveb a0@+,a1@+ | Move from one to four bytes to long
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subql #1,d0 | word align A0.
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dbeq d1,align_loop
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beq done
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already_aligned:
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movew d0,d1
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andiw #511,d1
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movew d1,sp@-
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moveq #9,d1
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lsrl d1,d0
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beq no_big_chunks_to_move
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moveml d2-d7/a2-a6,sp@-
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swap d0
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movew d0,sp@-
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swap d0
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bra move_big_chunk_end
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move_big_chunk:
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moveml a0@+,d1-d7/a2-a6
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moveml d1-d7/a2-a6,a1@
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moveml a0@+,d1-d7/a2-a6
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moveml d1-d7/a2-a6,a1@(48)
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moveml a0@+,d1-d7/a2-a6
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moveml d1-d7/a2-a6,a1@(96)
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moveml a0@+,d1-d7/a2-a6
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moveml d1-d7/a2-a6,a1@(144)
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moveml a0@+,d1-d7/a2-a6
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moveml d1-d7/a2-a6,a1@(192)
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moveml a0@+,d1-d7/a2-a6
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moveml d1-d7/a2-a6,a1@(240)
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moveml a0@+,d1-d7/a2-a6
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moveml d1-d7/a2-a6,a1@(288)
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moveml a0@+,d1-d7/a2-a6
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moveml d1-d7/a2-a6,a1@(336)
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moveml a0@+,d1-d7/a2-a6
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moveml d1-d7/a2-a6,a1@(384)
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moveml a0@+,d1-d7/a2-a6
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moveml d1-d7/a2-a6,a1@(432)
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moveml a0@+,d1-d7/a2
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moveml d1-d7/a2,a1@(480)
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addaw #512,a1
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move_big_chunk_end:
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dbf d0,move_big_chunk
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subqw #1,sp@
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bge move_big_chunk
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addqw #2,sp
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moveml sp@+,d2-d7/a2-a6
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no_big_chunks_to_move:
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movew sp@+,d0
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movew d0,d1
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lsrw #5,d1 | D1 now holds numbytes / 32 and
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andiw #31,d0 | D0 holds numbytes % 32.
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bra move_eight_longs_end
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move_eight_longs:
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movel a0@+,a1@+
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movel a0@+,a1@+
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movel a0@+,a1@+
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movel a0@+,a1@+
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movel a0@+,a1@+
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movel a0@+,a1@+
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movel a0@+,a1@+
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movel a0@+,a1@+
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move_eight_longs_end:
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dbf d1,move_eight_longs
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movew d0,d1
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lsrw #2,d1 | D1 now holds numbytes / 4 and
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bra move_long_end
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move_long:
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movel a0@+,a1@+
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move_long_end:
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dbf d1,move_long
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andiw #3,d0 | D0 holds numbytes % 4.
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bra move_byte_end
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move_byte:
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moveb a0@+,a1@+
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move_byte_end:
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dbf d0,move_byte
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done:
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rts
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");
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/****************************************************************************/
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extern void __bcopy(const void *src,void *dst,size_t len);
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/****************************************************************************/
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/* This is ugly: GCC 2.95.x assumes that 'unsigned long'<27>is used in the built-in
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memcmp/memcpy/memset functions instead of 'size_t'. This can produce warnings
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where none are necessary. */
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#if defined(__GNUC__) && (__GNUC__ < 3)
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void *
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memcpy(void *dst, const void *src, unsigned long len)
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#else
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void *
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memcpy(void *dst, const void *src, size_t len)
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#endif /* __GNUC__ && __GNUC__ < 3 */
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{
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void * result = dst;
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assert( (len == 0) || (dst != NULL && src != NULL && (int)len > 0) );
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#if defined(CHECK_FOR_NULL_POINTERS)
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{
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if(dst == NULL || src == NULL)
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{
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__set_errno(EFAULT);
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goto out;
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}
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}
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#endif /* CHECK_FOR_NULL_POINTERS */
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if(len > 0 && dst != src)
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{
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/* The two memory regions may not overlap. */
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assert((dst) >= (src)+len ||
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(src) >= (dst)+len);
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__bcopy(src,dst,len);
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}
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out:
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return(result);
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}
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/****************************************************************************/
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#else
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/****************************************************************************/
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INLINE STATIC VOID
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__memcpy(unsigned char * to,unsigned char * from,size_t len)
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{
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/* The setup below is intended to speed up copying larger
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* memory blocks. This can be very elaborate and should not be
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* done unless a payoff can be expected.
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*/
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if(len > 4 * sizeof(long))
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{
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/* Try to align both source and destination to an even address. */
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if(IS_UNALIGNED(to) && IS_UNALIGNED(from))
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{
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(*to++) = (*from++);
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len--;
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}
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/* Try to align both source and destination to addresses which are
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* multiples of four.
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*/
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if(len >= sizeof(short) && IS_SHORT_ALIGNED(to) && IS_SHORT_ALIGNED(from))
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{
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(*to++) = (*from++);
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(*to++) = (*from++);
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len -= sizeof(short);
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}
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/* If both source and destination are aligned to addresses which are
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* multiples of four and there is still enough data left to be copied,
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* try to move it in larger chunks.
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*/
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if(len >= sizeof(long) && IS_LONG_ALIGNED(to) && IS_LONG_ALIGNED(from))
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{
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unsigned long * _to = (unsigned long *)to;
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unsigned long * _from = (unsigned long *)from;
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/* An unrolled transfer loop, which shifts 32 bytes per iteration. */
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while(len >= 8 * sizeof(long))
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{
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/* The following should translate into load/store
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opcodes which encode the access offsets (0..7)
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into the respective displacement values. This
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should help the PowerPC by avoiding pipeline
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stalls (removing the postincrement on the address
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will do that) but has no noticeable impact on the
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68k platform (I checked). */
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_to[0] = _from[0];
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_to[1] = _from[1];
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_to[2] = _from[2];
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_to[3] = _from[3];
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_to[4] = _from[4];
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_to[5] = _from[5];
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_to[6] = _from[6];
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_to[7] = _from[7];
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_to += 8;
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_from += 8;
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/*
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(*_to++) = (*_from++);
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(*_to++) = (*_from++);
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(*_to++) = (*_from++);
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(*_to++) = (*_from++);
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(*_to++) = (*_from++);
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(*_to++) = (*_from++);
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(*_to++) = (*_from++);
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(*_to++) = (*_from++);
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*/
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len -= 8 * sizeof(long);
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}
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/* Try to mop up any small amounts of data still in need of
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* copying...
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*/
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while(len >= sizeof(long))
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{
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(*_to++) = (*_from++);
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len -= sizeof(long);
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}
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to = (char *)_to;
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from = (char *)_from;
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}
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}
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/* If there's anything left, copy the rest. */
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while(len-- > 0)
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(*to++) = (*from++);
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}
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/****************************************************************************/
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/* This is ugly: GCC 2.95.x assumes that 'unsigned long'<27>is used in the built-in
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memcmp/memcpy/memset functions instead of 'size_t'. This can produce warnings
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where none are necessary. */
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#if defined(__GNUC__) && (__GNUC__ < 3)
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void *
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memcpy(void *dst, const void *src, unsigned long len)
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#else
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void *
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memcpy(void *dst, const void *src, size_t len)
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#endif /* __GNUC__ && __GNUC__ < 3 */
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{
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void * result = dst;
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assert( (len == 0) || (dst != NULL && src != NULL && (int)len > 0) );
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#if defined(CHECK_FOR_NULL_POINTERS)
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{
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if(dst == NULL || src == NULL)
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{
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__set_errno(EFAULT);
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goto out;
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}
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}
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#endif /* CHECK_FOR_NULL_POINTERS */
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if(len > 0 && dst != src)
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{
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char * to = dst;
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const char * from = src;
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/* The two memory regions may not overlap. */
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assert((to) >= (from)+len ||
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(from) >= (to )+len);
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#if 0
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{
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while(len-- > 0)
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(*to++) = (*from++);
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}
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#else
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{
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__memcpy((unsigned char *)to,(unsigned char *)from,len);
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}
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#endif
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}
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out:
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return(result);
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}
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/****************************************************************************/
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#endif /* __GNUC__ && __mc68020__ */
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