删除文件中的半个汉字作业.txt

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; 删掉文件中的半个汉字---30060505钱学海

stack     segment para stack
          dw  100h dup(?)
stack     ends

data      segment para
filename1 db 'test.dat',0
handle1   dw  ?
filename2 db 'test1.dat',0 
handle2   dw ?
buff      db 1024*10 dup(?)
len       dw ?
data      ends

code      segment
          assume cs:code,ds:data,ss:stack
  start:  mov  ax,data
          mov  ds,ax
          lea  dx,filename1
          mov  cx,0
          mov  ah,3dh
          mov  al,0
          int  21h
          jnc  l1
          jmp  return
     l1:  mov  handle1,ax		;打开第一个文件

          mov  bx,ax
          mov  ah,3fh
          mov  cx,1025*10
          lea  dx,buff
          int  21h
          mov  len,ax			;读取数据至缓冲区

          lea  si,buff			;查到半个汉字后，删除，并前移
          mov  di,si
          push ds
          pop  es
          cld
          mov  cx,len
    lp1:  test byte ptr[si],80h
          jz   con2
          test byte ptr[si+1],80h
          jnz  con1
          push si
          push di
          push cx
          dec  cx
          inc  si
          cld
          rep  movsb
          dec  len
          pop  cx
          dec  cx
          pop  si
          pop  di
          jmp  lp1

   con1:  movsb
          dec  cx
   con2:  movsb
          loop lp1

          lea  dx,filename2		;创建第2个文件
          mov  cx,0
          mov  ah,3ch
          int  21h
          jc   return
          mov handle2,ax

          mov bx,ax
          mov ah,40h
          mov cx,len
          lea dx,buff
          int 21h			;写入

          mov bx,handle1
          mov ah,3eh
          int 21h

          mov bx,handle2
          mov ah,3eh
          int 21h

 return:  mov ah,4ch
          int 21h
     code ends
          end start