preventing sign extension

[Doug Gwyn]

In article <905 at thor.stolaf.edu> edf at rocky2.rockefeller.edu writes:
>#define INTMASK	(long) ((unsigned) (0))

Almost certainly this was supposed to be
 #define INTMASK	((long)(unsigned)~0)

The form you gave should not have worked on ANY C compiler.
Are you reading that from a magazine listing?  They're
notorious for goofing up "funny" symbols like ~, `, and \.