bmove.c
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上传日期:2022-05-23
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- /* Copyright (C) 2002 MySQL AB
-
- This library is free software; you can redistribute it and/or
- modify it under the terms of the GNU Library General Public
- License as published by the Free Software Foundation; either
- version 2 of the License, or (at your option) any later version.
-
- This library is distributed in the hope that it will be useful,
- but WITHOUT ANY WARRANTY; without even the implied warranty of
- MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
- Library General Public License for more details.
-
- You should have received a copy of the GNU Library General Public
- License along with this library; if not, write to the Free
- Software Foundation, Inc., 59 Temple Place - Suite 330, Boston,
- MA 02111-1307, USA */
- /* File : bmove.c
- Author : Richard A. O'Keefe.
- Michael Widenius; ifdef MC68000
- Updated: 23 April 1984
- Defines: bmove()
- bmove(dst, src, len) moves exactly "len" bytes from the source "src"
- to the destination "dst". It does not check for NUL characters as
- strncpy() and strnmov() do. Thus if your C compiler doesn't support
- structure assignment, you can simulate it with
- bmove(&to, &from, sizeof from);
- The standard 4.2bsd routine for this purpose is bcopy. But as bcopy
- has its first two arguments the other way around you may find this a
- bit easier to get right.
- No value is returned.
- Note: the "b" routines are there to exploit certain VAX order codes,
- but the MOVC3 instruction will only move 65535 characters. The asm
- code is presented for your interest and amusement.
- */
- #include <my_global.h>
- #include "m_string.h"
- #if !defined(HAVE_BMOVE) && !defined(bmove)
- #if VaxAsm
- void bmove(dst, src, len)
- char *dst, *src;
- uint len;
- {
- asm("movc3 12(ap),*8(ap),*4(ap)");
- }
- #else
- #if defined(MC68000) && defined(DS90)
- void bmove(dst, src, len)
- char *dst,*src;
- uint len; /* 0 <= len <= 65535 */
- {
- asm(" movl 12(a7),d0 ");
- asm(" subql #1,d0 ");
- asm(" blt .L5 ");
- asm(" movl 4(a7),a1 ");
- asm(" movl 8(a7),a0 ");
- asm(".L4: movb (a0)+,(a1)+ ");
- asm(" dbf d0,.L4 ");
- asm(".L5: ");
- }
- #else
- void bmove(dst, src, len)
- register char *dst;
- register const char *src;
- register uint len;
- {
- while (len-- != 0) *dst++ = *src++;
- }
- #endif
- #endif
- #endif