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Question: MIPS: reading and writing to file
Time: Updated 10 minute ago
Modified: Asked 29 minute ago
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MIPS: reading and writing to file

In MIPS, reading and writing to a file involves using system calls. The system call numbers for reading and writing to a file are 14 and 15, respectively.

Here’s an example of how to read a file in MIPS:

perl
    .data
filename: .asciiz "example.txt"
buffer:   .space  256

    .text
    .globl main

main:
    # Open the file for reading
    li      $v0, 13         # system call for open file
    la      $a0, filename   # filename pointer
    li      $a1, 0          # flags for reading
    li      $a2, 0          # mode is ignored
    syscall                 # open file

    move    $s0, $v0        # save file descriptor

    # Read from the file
    li      $v0, 14         # system call for reading from file
    move    $a0, $s0        # file descriptor
    la      $a1, buffer     # buffer pointer
    li      $a2, 256        # number of bytes to read
    syscall                 # read from file

    # Close the file
    li      $v0, 16         # system call for close file
    move    $a0, $s0        # file descriptor
    syscall                 # close file

    # Print the contents of the buffer
    li      $v0, 4          # system call for printing string
    la      $a0, buffer     # buffer pointer
    syscall                 # print buffer

    li      $v0, 10         # exit program
    syscall

This code opens a file called “example.txt” for reading, reads up to 256 bytes from the file into a buffer, closes the file, and then prints the contents of the buffer to the console.

Here’s an example of how to write to a file in MIPS:

perl
    .data
filename: .asciiz "output.txt"
message:  .asciiz "Hello, world!\n"

    .text
    .globl main

main:
    # Open the file for writing
    li      $v0, 15         # system call for open file
    la      $a0, filename   # filename pointer
    li      $a1, 1          # flags for writing
    li      $a2, 0          # mode is ignored
    syscall                 # open file

    move    $s0, $v0        # save file descriptor

    # Write to the file
    li      $v0, 15         # system call for writing to file
    move    $a0, $s0        # file descriptor
    la      $a1, message    # message pointer
    li      $a2, 14         # number of bytes to write (excluding null terminator)
    syscall                 # write to file

    # Close the file
    li      $v0, 16         # system call for close file
    move    $a0, $s0        # file descriptor
    syscall                 # close file

    li      $v0, 10         # exit program
    syscall

This code opens a file called “output.txt” for writing, writes the string “Hello, world!\n” to the file, closes the file, and then exits the program.

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