CODEWITHSUNDEEP
assemblymips
Sobiaholic
Sobiaholic

Reputation: 2957

Assembly: How to store string inside .asciiz?

In assembly, is there a way to store an input from the user as string into a .asciiz instead of .word?

I know sw and lw but how to do it with .asciiz?

Thanks

UPDATE:

I had to remove my code snippet, because it's a full program for an Assignment.

As you see, this is the application I'm trying to make, when the program read the filename from the user which is stored in userInput I cannot execute option processImage, but I use myInput2 which already has the name of my image file I want to read, processImage will work just fine.

Upvotes: 1

Views: 8731

Answers (1)

Jester
Jester

Reputation: 58762

sw and lw are runtime instructions while .asciiz is a compile time assembler directive. You can use .asciiz to allocate space for the user input if you want, but you still need to fill it at runtime, for example by reading characters in a loop and storing them using sb or using read string or similar system call if you have one.

The .asciiz is just syntactical sugar to make it easier to store strings, it's equivalent to specifying a bunch of bytes, just that you don't have to manually figure out the values. .asciiz "a" is the same as .byte 97, 0.

Update

    li $a1, 6     # length
    la $a0, str1  # buffer
    li $v0, 8     # read string call number
    syscall 

.data
str1: .byte 0, 0, 0, 0, 0, 0
str2: .word 0, 0, 0
str3: .space 6
.comm str4, 6
str5: .asciiz "12345"

The above str1 through str5 are all equivalent except that str5 isn't initialized to all zeroes. You can use any of those on the la $a0 line.

Upvotes: 1

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