fuz
2020-04-14 01:09
要比较两个字符串，请将一个字符串的每个字符与另一个字符串的相应字符进行比较。如果两个字符串的长度相同且所有字符都匹配，则它们相等。我假设您检查了两者的长度是否相同。
您可以使用显式循环来执行此操作：
mov ecx, 0 ; index and loop counter
.loop: mov al, [passwd+rcx] ; load a character from passwd
cmp al, [input+rcx] ; is it equal to the same character in the input?
jne .incorrect ; if not, the password is incorrect
inc ecx ; advance index
cmp ecx, 6 ; reached the end of the string?
jle .loop ; loop until we do
; if this line is reached, the password was correct
或者，您可以使用以下cmpsb说明：
mov rsi, passwd ; load the address of passwd
mov rdi, input ; load the address of input
mov ecx, 6 ; load the string length
repe cmpsb ; compare the strings
je correct_func ; jump to correct_func if they are equal
; if this line is reached, the password was wrong
有关详细信息，请参见指令集参考。
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