On Tue, Jun 21, 2016 at 09:57:06PM +0200, Adam Borowski wrote:
> On Tue, Jun 21, 2016 at 05:55:52PM +0100, KatolaZ wrote:
> > On Tue, Jun 21, 2016 at 06:41:15PM +0200, Edward Bartolo wrote:
> > > And
> > > << if ((c >= 'a' && c <= 'z') || (c >= 'A' && c <= 'Z')) >>
> > >
> > > would reduce to:
> > >
> > > if (isletter(c))
> >
> > or, you could just use "isalpha(c)", as suggested also by Urban.
>
> Bad idea, it's non-portable. I don't know about isalpha() in particular,
> but quite recently I met a hard to debug bug on Solaris on isspace(). Its
> implementation returns bogus values for bytes with the high bit set, not
> even the same on every call for the same input.
>

Uh? isalpha() not portable? Its behaviour was defined by ANSI C89, as
well as that of isspace(), isupper(), and a few more functions in
ctype.h. Maybe you hit a specific bug of a specific implementation,
but if you can't even use the functions defined in ANSI C, you'd
better program in assembly :)

HND

KatolaZ

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