Where is the next uid from adduser pulled from?

[n j]

> Tried looking for the adduser program, but could not find adduser.c

Just to point out that adduser is a shell script, as witnessed by:

# file /usr/sbin/adduser
/usr/sbin/adduser: Bourne shell script text executable

and the response to the original question - how does the system
generate new UIDs - is best answered by examining the get_nextuid ()
function inside adduser script.

Regards,
-- 
Nino