Terminal Guide

Move the cursor to the left amount cells.

If amount is 0, adjust it to 1.

This unsets the pending wrap state without wrapping.

If not both of reverse wrap mode and wraparound mode are set:

• Move the cursor amount cells left. If it would cross the left-most column of the scrolling region, stop at the left-most column of the scrolling region. If the cursor would move left of the left-most column of the screen, move to the left most column of the screen.

Else:

• If the pending wrap state is set, reduce amount by one.
• If the cursor is left of the left-most column of the scrolling region:
  • Move the cursor left amount of cells with the following rules:
  • Each time the cursor is advanced past the left screen edge, continue on the right-most column of the scrolling region on the line above. If that would be before the top-most line of the screen resume on the bottom most line of the screen (ignoring the top and bottom margins of the scrolling region).
• If the cursor is on or right of the left-most column of the scrolling region:
  • Move the cursor left amount of cells with the following rules:
  • Each time the cursor is advanced past the left-most column of the scrolling region, continue on the right-most column of the scrolling region on the line above. If that would be before the top-most line of the screen resume on the bottom most line of the screen (ignoring the top and bottom margins of the scrolling region).