字符串比较的问题，大家帮帮忙？

[jianjun081]

比较2个字符串，将2个串中小的拿出组成新串？用CMPSB以后影响好几个标志，我不知道该怎样跳转,源码如下：
data segment
src db '1b3d5f7'
dst db 'a2c4e6g'
res db 'result=', 7 dup(?),'$'
data ends

code segment
assume cs:code,ds:data
start:
mov ax,data
mov ds,ax

lea si,src
lea di,dst
lea dx,res

mov cx,7d
mov bx,7h
lop:
cmpsb

jb ble
mov dl,[di-1]
jmp next
ble:
mov dl,[si-1]

next:
mov [bx+res],dl
inc bx
loop lop

xor dx,dx
mov dl,offset res
mov ah,09h
int 21h

mov ax, 4c00h
int 21h
code ends
end start

[csdsjkk]

data segment
src db '1b3d5f7'
dst db 'a2c4e6g'
res db 'result=', 7 dup(?),'$'
data ends

code segment
assume cs:code,ds:data
start:
mov ax,data
mov ds,ax
mov es,ax

lea si,src
lea di,dst
lea dx,res

mov cx,7d
mov bx,7h
lop:
cmpsb

jb ble
mov dl,[di-1]
jmp next
ble:
mov dl,[si-1]

next:
mov [bx+res],dl
inc bx
loop lop

mov dx,offset res
mov ah,09h
int 21h

mov ax, 4c00h
int 21h
code ends
end start

[ahjoe]

JB

[ahjoe]

data segment
src db '1b3d5f7'
dst db 'a2c4e6g'
res db 'result=', 7 dup(?),'$'
data ends

code segment
assume cs:code,ds:data
start:
mov ax,data
mov ds,ax
mov es,ax ;增加该条，串操作指令要用到ES

lea si,src
lea di,dst
lea dx,res

mov cx,7d
mov bx,7h
cld ; 清DF, 该标志控制串操作的方向
lop:
rep cmpsb

jb ble
mov si,offset dst ;改
jmp next
ble:
mov si,offset src ;改

next:
mov di, offset res + 7
mov cx, 7
rep movsb

xor dx,dx
mov dl,offset res
mov ah,09h
int 21h

mov ax, 4c00h
int 21h
code ends
end start

[ahjoe]

lea di,dst
lea dx,res ;多余

mov cx,7d
mov bx,7h ;多余

[紫郢剑侠]

组成新串？

怎么组成?

[jianjun081]

比如上面的例子，比较后的串为"1234567"或'abcdefg'啊

[jianjun081]

问题的关键在于CMPSB 语句执行后，改用那个跳转语句。

[csdsjkk]

to ahjoe(强哥):
你没看懂楼主的要求

[jianjun081]

to csdsjkk():
谢谢你，你只加了一句话 mov es,ax 就可以。不愧是高手。