IsUnsigned() function?

[carroll at m.cs.uiuc.edu]

/* Written 12:07 pm  Aug  2, 1990 by henry at zoo.toronto.edu in m.cs.uiuc.edu:comp.lang.c */
In article <4700058 at m.cs.uiuc.edu> carroll at m.cs.uiuc.edu writes:
>The problem was that "signed" was a valid type modifier, but "unsigned" wasn't.
>If chars were (by default) unsigned, they could be made signed...

Um, excuse me?
/* End of text from m.cs.uiuc.edu:comp.lang.c */
Woops. Change "signed" <-> "unsigned". Got to get some more sleep.