How would I translate this from C++ to mips?

int isSubstring(string s1, string s2)

{

int M = s1.length();

int N = s2.length();

/* A loop to slide pat[] one by one */

for (int i = 0; i <= N - M; i++) {

int j;

/* For current index i, check for pattern match */

for (j = 0; j < M; j++)

if (s2[i + j] != s1[j])

break;

if (j == M)

return i;

}

return -1;

}

My attempt:

li $t2, 0 sub $s3, $s2, $s1 outer_loop: li $t3, 0 inner_loop: add $s2, $t2, $t3 bne $s2, $s1, exit # end of inner loop beq $t3, $s1, exit2 addi $t2, $t2, 1 ble $t2, $s3, outer_loop exit: mfc0 $a0, $14 # lw $a0, ($a0) # srl $a0, $a0, 6 # li $v0, 1 # code for break syscall

exit2: move $s4, $t2