bcmp.c
上传用户:romrleung
上传日期:2022-05-23
资源大小:18897k
文件大小:2k
- /* Copyright (C) 2000 MySQL AB
- This program is free software; you can redistribute it and/or modify
- it under the terms of the GNU General Public License as published by
- the Free Software Foundation; either version 2 of the License, or
- (at your option) any later version.
- This program 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 General Public License for more details.
- You should have received a copy of the GNU General Public License
- along with this program; if not, write to the Free Software
- Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA */
- /*
- bcmp(s1, s2, len) returns 0 if the "len" bytes starting at "s1" are
- identical to the "len" bytes starting at "s2", non-zero if they are
- different.
- Now only used with purify because purify gives wrong warnings when
- comparing a shorter string with bcmp.
- */
- #include <my_global.h>
- #include "m_string.h"
- #ifdef HAVE_purify
- #undef bcmp
- #undef HAVE_BCMP
- #endif
- #if !defined(bcmp) && !defined(HAVE_BCMP)
- #if defined(MC68000) && defined(DS90)
- int bcmp(s1,s2, len)
- const char *s1;
- const char *s2;
- uint len; /* 0 <= len <= 65535 */
- {
- asm(" movl 12(a7),d0 ");
- asm(" subqw #1,d0 ");
- asm(" blt .L5 ");
- asm(" movl 4(a7),a1 ");
- asm(" movl 8(a7),a0 ");
- asm(".L4: cmpmb (a0)+,(a1)+ ");
- asm(" dbne d0,.L4 ");
- asm(".L5: addqw #1,d0 ");
- }
- #else
- #ifndef HAVE_purify
- int bcmp(register const char *s1,register const char *s2, register uint len)
- #else
- int my_bcmp(register const char *s1,register const char *s2, register uint len)
- #endif
- {
- while (len-- != 0 && *s1++ == *s2++) ;
- return len+1;
- }
- #endif
- #endif /* BSD_FUNCS */