Read after delete DOS test

open-delete.asm

org 100h

section .text

; open file
mov ah, 3dh
mov al, 0h
lea dx, [file_name]
int 21h
jc open_error_fn
mov [handle], ax

; delete file
mov ah, 41h
lea dx, [file_name]
int 21h
jc delete_error_fn

; read file
mov ah, 3fh
mov bx, [handle]
mov cx, 32
lea dx, [str]
int 21h
jc read_error_fn

; append newline and M$ termination to file contents
lea dx, [str]
mov bx, dx
add bx, ax
mov word [bx], 13
inc bx
mov word [bx], 10
inc bx
mov word [bx], '$'

; print the string we read from the file
mov ah, 09h
int 21h

end:
mov ah, 0h
int 21h

open_error_fn:
lea dx, [open_error]
jmp print_error

delete_error_fn:
lea dx, [delete_error]
jmp print_error

read_error_fn:
lea dx, [read_error]

print_error:
mov ah, 09h
int 21h
jmp end

section .data

file_name: db 'test.txt', 0
open_error: db 'Failed to open file', 13, 10, '$'
delete_error: db 'Failed to delete file', 13, 10, '$'
read_error: db 'Failed to read file', 13, 10, '$'

section .bss
handle: resb 2
str: resb 64