... > And often that char isn't actually a 'char', it is actually an 'int', > either because you have situations like 'getch()', or you have simply > just the usual C expression rules, ie you have something like > > isprint(c) ? c : '.' > > where even if 'c' is of type 'char', the end result is 'int'. Which is, of course, invalid C :-) The domain of the isxxxx() functions is 'the values of char cast to unsigned int' and EOF. So typically [-1 .. 255]. Passing a signed char variable to isprint() is likely to generate undesired behaviour (like a code dump). It has to be said that I did a full trawl through the NetBSD userspace code base to fix all the isxxx() calls and failed to find a single one that could actually pass EOF. David - Registered Address Lakeside, Bramley Road, Mount Farm, Milton Keynes, MK1 1PT, UK Registration No: 1397386 (Wales)
