strxmov.asm
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 & MySQL Finland AB & TCX DataKonsult 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
- TITLE Optimized strxmov for MSDOS / Intel 8086
- ifndef M_I386
- .8087
- DOSSEG
- .MODEL LARGE
- .CODE
- PUBLIC _strxmov
- _strxmov PROC
- mov bx,sp
- add bx,4
- push si
- push di
- mov cx,ds ; Save ds
- ASSUME DS: NOTHING
- ASSUME ES: NOTHING
- les di,DWORD PTR ss:[bx] ; dst
- jmp next_str
- start_str:
- mov al,ds:[si]
- movsb ; move arg
- and al,al
- jnz start_str ; Not last
- dec di
- next_str:
- add bx,4
- lds si,DWORD PTR ss:[bx]
- mov ax,ds
- or ax,si
- jnz start_str
- mov byte ptr es:[di],0 ; Force end null (if no source)
- mov ds,cx
- mov ax,di ; Return ptr to last 0
- mov dx,es
- pop di
- pop si
- ret
- _strxmov ENDP
- else
- include macros.asm
- begcode strxmov
- public _strxmov
- _strxmov PROC near
- ASSUME DS: NOTHING
- ASSUME ES: NOTHING
- push EBP
- mov EBP,ESP
- mov EDX,EBX ; Save EBX
- mov ECX,ESI ; Save ESI
- push EDI
- mov EDI,8[EBP] ; Get destination
- lea EBX,8[EBP] ; Get adress to first source - 4
- xor al,al
- jmp next_str
- start_str: movsb
- cmp AL,[EDI-1]
- jne start_str
- dec EDI ; Don't copy last null
- next_str: add EBX,4
- mov ESI,[EBX]
- or ESI,ESI
- jne start_str
- mov byte ptr [EDI],0 ; Force last null
- mov EAX,EDI ; Return ptr to null
- pop EDI
- mov ESI,ECX
- mov EBX,EDX
- pop EBP
- ret
- _strxmov endp
- endcode strxmov
- endif
- END