assembly - 如何在汇编中将空格字符添加到字符串中？

Question

所以，我必须执行文本更正。如果我在文本/字符串中遇到逗号，我需要验证它之前是否有空格以消除它以及逗号之后是否有空格。如果没有，我需要在逗号后面加一个。我试图这样做，但只有在逗号之前消除空格的部分起作用。当我尝试添加时，我覆盖了一些东西（我在 TD 中看到了），我不知道是什么。

     COMMA:
    CMP BUFFER[SI],00 ; end of text
    JE EXIT
    CMP BUFFER[SI],44 ; 44 is the ascii code for comma
    JNE NEXTC
    CMP BUFFER[SI],44
    JE VERIFY
NEXTC:
    INC SI
    JMP COMMA 
VERIFY:
    CMP BUFFER[SI-1],20H ; 20 ascii code for space 
    JNE VERIFY2         ; if it isn't space, I search if the next element after comma is space
    CMP BUFFER[SI-1],20H
    JE CONDITION
CONDITION:
    MOV CL,L
    SUB CX,SI
    SHR CL,1;   
    XOR CH,CH;
    MOV DI,SI
    JMP REMOVESPACE ; I have space before the comma and I eliminate it
REMOVESPACE:
    MOV DL, BUFFER[DI]
    MOV BUFFER[DI-1],DL ; overwrite the useless space 
    INC DI
    LOOP REMOVESPACE
VERIFY2:
    INC SI
    CMP BUFFER[SI],20H ; if there is space, I jump to the initial stuff, searching for another comma
    JE COMMA
    CMP BUFFER[SI],20H
    JNE CONDITION2 ; if there isn't, I try to add 
CONDITION2:
    MOV CL,L ; L is the no of chars in the buffer
    SUB CX,SI
    SHR CL,1;   
    XOR CH,CH;
    MOV DI,LEN ; LEN also as L but DW
    SHR DI,1
    JMP ADDSPACE
ADDSPACE:
    MOV DL,BUFFER[DI]
    MOV BUFFER[DI+1],DL ; here I try to move the elements, obtaining buffer[si+1] free and then move a space to it
    DEC DI
    LOOP ADDSPACE
    MOV BUFFER[SI+1],20H 
    JMP COMMA

我不知道该怎么办，我认为我无法将所有元素向右移动这一事实存在问题，因为没有缓冲区[L+1] 或其他东西。

标签： assemblyx86-16