A function similar to list-length.
lispworks
dotted-list-length list => result
| list⇩ | 
A list. | 
| result | 
An integer. | 
The function dotted-list-length performs the same action as list-length, except that if the last cdr of list is not nil then instead of signaling an error, it returns the number of conses plus 1.
LispWorks® User Guide and Reference Manual - 01 Dec 2021 19:30:41