ctype (was: VI bug)

[Amos Shapir NSTA]

The is...() macros are only valid to test the type of ASCII values;
that's what the isascii() macro is for.

The correct usage is:
	if(isascii(c) && isdigit(c)) ...

and that's how it should be fixed in vi.
(See K&R p.127 or H&S p. 291).

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	Amos Shapir				My other CPU is a NS32532
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