mips读取多行的字符串

Question

我正在尝试从用户读取最多100个字符的输入，然后反转输入。当检测到Z并且应该能够读取多行时，我的程序应该停止读取。现在我可以通过一行读取输入并且它可以工作，我只是在与多线部分挣扎。以下是我到目前为止的情况：

    .data
    buffer: .space 100
    str2:  .asciiz "\nYou wrote:\n"
    str1:  .ascii "Enter string (max 100 chars): "

    .text

    main:
    la $a0,str1 #Load and print string asking for string
    li $v0,4
    syscall

    li $v0, 8 #take in input
    la $a0, buffer #load byte space into address
    li $a1, 100 # allot the byte space for string
    move $t1, $a0 #save string to t1
    syscall

    la $a0, str2 #load and print “You wrote" string
    li $v0,4
    syscall


    la $a0, buffer #reload byte space to primary address
    li      $t2, 0  

    strLen:                     #getting length of string
    lb      $t0, buffer($t2)    #loading value
    add     $t2, $t2, 1
    bne     $t0, $zero, strLen
    sub     $t2, $t2, 1
    li      $v0, 11             #load immedialtey - print low-level byte

   Loop:
   la      $t0, buffer($t2)     #loading value
   lb      $a0, ($t0)
   syscall

   sub     $t2, $t2, 1
   bnez    $t2, Loop

   li $v0,10 #end program
   syscall