>	this is my proposed fix.  unfortunately, since ctype.h defines
>	macros for is*, binaries need to be recompiled to use the new isprint()
>	declaration.  isprint() hardcodes space (' ') so that we do not
>	change (old) ctype file format.

	the patch has bad sideeffect: isprint('\t') result will go strange
	unless you recompile your binary.

			isprint('\t')		isblank('\t')

	used to be:	false			false (incorrect)
	libc change only (no binary recompilation)
			true (incorrect)	true
	correct one (if you recompile binaries and libc, it will be achieved):
			false			true

itojun