MIPS中的Strncpy行为异常 [英] Strncpy in MIPS has a weird behavior

问题描述

这是我的strncpy代码.从理论上讲，它应该可以工作，但是当我对其进行测试时，它就会产生垃圾.

Here's my code for strncpy. In theory it should work, but when I run tests on it it gives out garbage.

Arguments:
  $a0 = pointer to destination array
  $a1 = source string
  $a2 = number of characters to copy

返回:目标数组

 strncpy:   
        beqz $a2, out
        lb $t0, 0($a1)      #load byte
        beqz $t0 out 
        subiu $a2, $a2, 1
        sb $t0, 0($a0)
        addiu $a0, $a0, 1
        addiu $a1, $a1, 1
        j strncpy
out:
    lb $0 0($a0)
        move $v0 $a0
        jr $ra

推荐答案

复制目标数组的原始地址($ a0)并将其加载到$ a0-> $ v0的"out:"中. (在您的版本中，除了上面提到的问题之外，您总是会在最后一个插入符后面找到字符:)

coppy original address of destination array ($a0) and load it in "out:" in $a0->$v0. (in your version you would always get the char behind the last insert... in addition to the above mentioned problem in out:)

addi $a3 $a0 0

strncpy:
(...)

out:
move $a0 $a3
move $v0 $a0

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