我想获得一个源字符串，在其中找到键并用替换字符串替换该键，以便我复制 源代码和结果中的替换字符串。
当源字符串中的密钥不存在时，它会输出正确的提示：＆＃34;密钥不会出现在字符串中。＆＃34;
但是当来源包含键时，它会停滞不前并且不会继续运行
（它看起来在找到的标签部分已被遗漏并且有溢出）
任何人都可以帮助纠正找到部分？
任何帮助将不胜感激：）
; program to search for one string embedded in another
; author: R. Detmer revised: 10/97
.386
.MODEL FLAT
ExitProcess PROTO NEAR32 stdcall, dwExitCode:DWORD
INCLUDE io.h
cr EQU 0dh ; carriage return character
Lf EQU 0ah ; linefeed character
.STACK 4096 ; reserve 4096-byte stack
.DATA
prompt1 BYTE "String to search? ", 0
prompt2 BYTE cr, Lf, "Key to search for? ", 0
prompt3 BYTE cr, Lf, "Word to replace? ", 0
source BYTE 100 DUP (?)
key BYTE 20 DUP (?)
replace BYTE 20 DUP (?)
srcLength DWORD ?
keyLength DWORD ?
repLength DWORD ?
BeginLength DWORD ?
restLength DWORD ?
cpyLength DWORD ?
lastPosn DWORD ?
restPosition DWORD ?
firstParam DWORD ?
secondParam DWORD ?
keyPosition DWORD ?
failure BYTE cr,Lf,Lf,"The key does not appear in the string.",cr,Lf,0
success BYTE cr,Lf,Lf, " The result string is : " ,cr,Lf,Lf
result BYTE 200 DUP (?)
PUBLIC _start ; make entry point public
.CODE
_start: output prompt1 ; ask for
input source,100 ; and input source string
lea eax, source ; find length of string
push eax ; length parameter
call strlen
mov srcLength,eax ; save length of source
output prompt2 ; ask for
input key,20 ; and input key string
lea eax, key ; find length of string
push eax ; length parameter
call strlen
mov keyLength,eax ; save length of key
output prompt3 ; ask for
input replace,20 ; and input replace string
lea eax, replace ; find length of string
push eax ; length parameter
call strlen
dec eax
mov repLength,eax ; save length of replace
; calculate last position of source to check
mov eax,srcLength
sub eax,keyLength
inc eax ; srcLength − keyLength + 1
mov lastPosn, eax
cld ; left to right comparison
mov eax,1 ; starting position
whilePosn: cmp eax,lastPosn ; position <= last_posn?
jnle endWhilePosn ; exit if past last position
lea esi,source ; address of source string
add esi,eax ; add position
dec esi ; address of position to check is incremented automatically
lea edi,key ; address of key
mov ecx,keyLength ; number of positions to check
repe cmpsb ; check
jz found ; exit on success
inc eax ; increment position
jmp whilePosn ; repeat
endWhilePosn:
output failure ; the search failed
jmp quit ; exit
;-------------------------------------------------------------
found:
mov keyPosition, eax ; position of key
mov ebx, eax ;copy start position of key
lea eax, source
sub ebx, eax ;position - source address
mov BeginLength, ebx ;begin Source length (before key)
add ebx, keyLength
mov eax, srcLength
sub eax, ebx
mov restLength, eax ;rest of Source length (after key)
mov eax, keyPosition
add eax, keyLength ; position + key
mov restPosition, eax
;source begin to result
lea eax, result
mov firstParam, eax ; destination address
lea eax, source
mov secondParam, eax
mov eax, BeginLength ; copy length
mov cpyLength, eax
mov esi,firstParam ;initial source address
mov edi,secondParam ;destination
mov ecx ,cpyLength
rep movsb ;copy bytes
;replace to result
mov eax, firstParam
add eax , BeginLength
mov firstParam, eax ; address of rest of result
lea eax, replace
mov secondParam, eax ; string to replace
mov eax, repLength ; copy length
mov cpyLength, eax
mov esi,firstParam ;initial source address
mov edi,secondParam ;destination
mov ecx ,cpyLength
rep movsb ;copy bytes
;Rest to result
mov eax, firstParam
add eax , repLength
mov firstParam, eax ; address of rest of result
mov eax, restPosition
mov secondParam, eax
mov eax, restLength
mov cpyLength, eax
mov esi,firstParam ;initial source address
mov edi,secondParam ;destination
mov ecx ,cpyLength
rep movsb ;copy bytes
mov BYTE PTR [edi],0 ;terminate destination string
output success
quit:
INVOKE ExitProcess, 0 ; exit with return code 0
;----------------------------------------------------------
strlen PROC NEAR32
; find length of string whose address is passed on stack
; length returned in EAX
push ebp ; establish stack frame
mov ebp, esp
pushf ; save flags
push ebx ; and EBX
sub eax, eax ; length := 0
mov ebx, [ebp+8] ; address of string
whileChar: cmp BYTE PTR [ebx], 0 ; null byte?
je endWhileChar ; exit if so
inc eax ; increment length
inc ebx ; point at next character
jmp whileChar ; repeat
endWhileChar:
pop ebx ; restore registers and flags
popf
pop ebp
ret 4 ; return, discarding parameter
strlen ENDP
END
答案 0 :(得分：1)
success BYTE cr,Lf,Lf, " The result string is : " ,cr,Lf,Lf
您忘记了终止成功消息
它会破坏你的最终宏调用output success，因此似乎程序没有正确替换字符串。