cvs commit: src/include ctype.h src/lib/libc/gen isctype.c tolower.c toupper.c

[Simon 'corecode' Schubert]

Lately Matthew Dillon <dillon at xxxxxxxxxxxxxxxxxxxxxxx> said:
>   Log:
>   It is not acceptable to index the array out of bounds if an illegal index
>   is passed to a ctype function or macro.  Undo the last commit.  Emplace an
>   explicit range check for the integer passed to the ctype macros and
>   functions rather then underflowing or overflowing the array.  Currently
>   return 0 if the integer is out of range (it might be more appropriate to
>   assert).

hm. this doesn't really add value to your testing case for passing signed
chars. now they all appear non-printable - and not like the integer
equivalent, as the naive programmer would expect. I would prefer the
openbsd way:
	if (c == EOF)
		return 0;
	else
		return ((table+1)[(unsigned char)c)]);

this gives expected results for (common?) misuse and even saves us one
conditional.

cheers
  simon

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