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81 lines
2.3 KiB
C
81 lines
2.3 KiB
C
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/* Copyright (C) 2002 MySQL AB
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This library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Library General Public
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License as published by the Free Software Foundation; either
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version 2 of the License, or (at your option) any later version.
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This library is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Library General Public License for more details.
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You should have received a copy of the GNU Library General Public
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License along with this library; if not, write to the Free
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Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston,
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MA 02111-1301, USA */
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/* File : bmove.c
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Author : Richard A. O'Keefe.
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Michael Widenius; ifdef MC68000
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Updated: 23 April 1984
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Defines: bmove()
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bmove(dst, src, len) moves exactly "len" bytes from the source "src"
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to the destination "dst". It does not check for NUL characters as
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strncpy() and strnmov() do. Thus if your C compiler doesn't support
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structure assignment, you can simulate it with
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bmove(&to, &from, sizeof from);
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The standard 4.2bsd routine for this purpose is bcopy. But as bcopy
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has its first two arguments the other way around you may find this a
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bit easier to get right.
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No value is returned.
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Note: the "b" routines are there to exploit certain VAX order codes,
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but the MOVC3 instruction will only move 65535 characters. The asm
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code is presented for your interest and amusement.
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*/
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#include <my_global.h>
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#include "m_string.h"
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#if !defined(HAVE_BMOVE) && !defined(bmove)
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#if VaxAsm
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void bmove(dst, src, len)
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char *dst, *src;
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uint len;
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{
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asm("movc3 12(ap),*8(ap),*4(ap)");
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}
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#else
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#if defined(MC68000) && defined(DS90)
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void bmove(dst, src, len)
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char *dst,*src;
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uint len; /* 0 <= len <= 65535 */
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{
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asm(" movl 12(a7),d0 ");
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asm(" subql #1,d0 ");
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asm(" blt .L5 ");
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asm(" movl 4(a7),a1 ");
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asm(" movl 8(a7),a0 ");
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asm(".L4: movb (a0)+,(a1)+ ");
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asm(" dbf d0,.L4 ");
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asm(".L5: ");
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}
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#else
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void bmove(dst, src, len)
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register char *dst;
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register const char *src;
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register uint len;
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{
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while (len-- != 0) *dst++ = *src++;
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}
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#endif
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#endif
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#endif
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