macOS Help with mips program that reverses each word.?

[mikebrown]

Hello, I have a problem that has been driving me crazy. I have a program that reads a string and then reverses the string but what I need is the program to reverse each word like: ("10 is ten" becomes "01 si net"). Can anyone help? Here is what I have:
# PROGRAM:

.data # Data declaration section
a_string: .asciiz "desrever eb ot gnirts a si sihT\n"

.text # Assembly language instructions
main: la $a0,a_string #base address of string
li $v0,4 #read string
syscall

addi $a1,$zero,32 #pass lenght of string
jal stringreverse #reverse the string

stringreverse:
add $t0,$a0,$zero #starting address
add $t1,$zero,$zero #i = 0
addi $t2,$a1,-1 #j = length-1

loop:
add $t3,$t0,$t1
lb $t4,0($t3) #the lb string
add $t5,$t0,$t2
lb $t6,0($t5) #the lb string[j]
sb $t4,0($t5) #string[j] = string
sb $t6,0($t3) #string = string[j]
addi $t1,$t1,1 #i++
addi $t2,$t2,-1 #j--
#if i>=j then break - $t1 < $t2
slt $t6,$t2,$t1
beqz $t6,loop

exit:
li$v1, 4 #system call to print reversed string
la$a2, 0($a1)
syscall

li $v0, 10
syscall # Exit program

Thanks in advance for any help

 

[lee1210]

Is this homework?

What environment (spim?) are you using on your Mac if someone wanted to try running this themselves?

Have you devised an algorithm/methodology for doing this, but don't know how to code it? If you had an algorithm, could you code it yourself?

-Lee

 

[lee1210]

The OP has not returned since the original post, so I'll try to give general advice without giving this away, as it is likely homework.

You already have a way to reverse a string given a base address and a length. It should be pretty easy to write something that gets word length (bound by the end of the total string, of course). It should then be trivial to pass the base of the word and the word length to the current reverse routine. Since this routine does the swap "in place" once you've done all the words one at a time, you're done.

-Lee