> > > Option #1 would be like this:
> > > In ftpio.c file,
> > > -                               if (ftprc && isdigit(buf[match.rm_so+1]))
> > > +                               if (ftprc && isdigit((int)buf[match.rm_so+1]))
> > > 
> > > And here is option #2:
> > > In /usr/src/include/ctype.h file,
> > > -#define isdigit(c)      ((int)((_ctype_ + 1)[(c)] & _N))
> > > +#define isdigit(c)      ((int)((_ctype_ + 1)[(int)(c)] & _N))
> > 
> > isdigit(3) says the prototype is "int isdigit(int c);", so #1 would seem
> > correct.
> > 
> 
> True, and thus, was it a function, C would do the cast (int promotion 
> as in #2) for us.  That's something I wanted to ask about on userlevel 
> for quite some time already... Same applies to the to* functions 
> of ctype, too.
> 
> Is relying on C to make
> 
> char c = <whatever>, tolower(c) 
> 
> work w/o complaint a user error ?

This has been brought up in the past, see:

http://mail-index.netbsd.org/tech-userlevel/2004/10/28/0010.html
http://mail-index.netbsd.org/tech-userlevel/2004/10/28/0008.html

	Regards,
		-- Jachym Holecek