如何实施新生产线

Question

i'm working in text mode 80x25 and am expecting some string of characters terminated by 0 to print (no CRLF before). how can I then jump to the next line? what i actualy need is aligning the es:edi (0:b8000) offset to next multiplier of 160, but i have no idea how to do it somehow smart. if you have already done this or have any idea please share it with me or give me a hint. i don't want any interrupts and solutions without division are prefered. thx stu

Answer 1

As Anders said, I'd do something like:

nextlineoffset = offset + (160 - ((offset + 160) mod 160))

That is,

1. Add a line to offset
2. Subtract away the extra offset

It uses one division, but does away the need of a multiplication.

Answer 2

How about a switch -like construction? If you'r only interested in 160 character chunks on an 80x25 screen there are only thirteen cases to account for, and that should be a manageable (and renderable) sequence of CMP and conditional jumps.