A tiny vi like screen editor
Original sources were published in this book:
Author: Webb Miller
Title: A software tools sampler
Publisher: Prentice-Hall, Inc. Upper Saddle River, NJ, USA ©1987
ISBN: 0-13-822305-X
Martin, a guy from one of my hangouts named <c.o.cpm>, located the sources from this book. The repository starts from these original sources. Martin also provided the initial CP/M patches for compiling with HI-TECH C. Then the sources were overworked, to get it compiled without warnings on old systems with K&R C compiler, as well as modern systems with ANSI C compiler.
This version of s is known to compile on:
HI-TECH C for the Z80 under CP/M
clang under OSX
clang and gcc under Linux
Mark Williams K&R C compiler under COHERENT