Open, read, print, close file in MIPS

This is Open, read, print, close file example v2. Launch EzMIPS, copy the following MIPS code and paste it into EzMIPS. Assemble, Run.

# ----------------------------------------------------------- #

.data

filename:       .asciiz "test.txt"  #file name
szfilenotfound: .asciiz "'Error. File not found'"
textSpace:      .space 1050         #space to store string

.text

main:

# ----------------------- open the file --------------------- #

    li $v0, 13                # open a file
    li $a1, 0                 # file flag (read)
    la $a0, filename          # load file name
    add $a2, $zero, $zero     # file mode (unused)
    syscall
    
    bne $v0, $zero, readfile
    
    la $a0, szfilenotfound    # address of error message
    li $v0, 4                 # print string
    syscall  
    j end

# ---------------- read file text and put it in buffer ------ #

readfile:

    move $a0, $v0             # load file descriptor
    move $a3, $v0             # file descriptor for later use!
    li $v0, 14                # read from file
    la $a1, textSpace         # adrress of buffer
    li $a2, 1050              # number of bytes to be read
    syscall

# ------------- print file text already in buffer ----------- #

    la $a0, textSpace         # address of string to be printed
    li $v0, 4                 # print string
    syscall

# --------------------- close the file ---------------------- #

    move $a0, $a3             # $a3 kept the file descriptor
    li $v0, 16
    syscall

# ---------------------- exit program ------------------------ #
end:

    li $v0, 10
    syscall

Please let me know of any suggestions or bugs regarding the code above.

Regards,

Antonis