CALLS program sought

[MS W422]

A couple of years ago someone posted a C program called "calls"
that would troll through a C program and output a kind of diagram
of the subroutine calls the program made.  Each level of nested
calls was indented further than the previous calls.

Unfortunately, I have misplaced my source to "calls" and, even
more unfortunately, I have a need for its services now.  DOes
anyone have the source to this or a similar program.  Please
send me mail and I will select one person to get the program
from (to avoid dozens of copies heaped on our poor disk).

	Walt (Lazear at MITRE.ARPA)