Subject: Re: bin/21645: Localized comments and indent(1)
To: None <firstname.lastname@example.org>
From: Mishka <email@example.com>
Date: 06/18/2003 17:52:52
David Laight <firstname.lastname@example.org> wrote:
> The (int) cast only gets rid of a warning genberated by some compilers.
> The problem is that if 'c' is a signed char, then it is promoted to
> a signed integer using by preserving the sign. This does not DTRT
> for any of the isXXX() functions.
I'll see now. IYSS, how about (int)((unsigned char)c)?
So, the ctype convertion inside isXXXX() functions will looks like:
#define isXXXX(c) ((int)((_ctype_ + 1)[(int)((unsigned char)(c))] & (CTYPE_FLAGS)))
This causes the index [(int)((unsigned char)(c))] will always return
a positive value, even in signed int.