Re: [PATCH 2/2] lib: glob: replace bitwise OR with logical operation on boolean

[David Laight <david.laight.linux@gmail.com>]

On Sun, 1 Mar 2026 11:25:42 -0800
Andrew Morton <akpm@linux-foundation.org> wrote:

> On Sun,  1 Mar 2026 15:21:42 +0000 Josh Law <hlcj1234567@gmail.com> wrote:
> 
> > Using bitwise OR (|=) on a boolean variable is valid C, but replacing it with a direct logical assignment makes the intent clearer and appeases strict static analysis tools.
> >   
> 
> Fair enough.

It might even generate better code.
Compilers have been known to generate 'really crap code(tm)' for
boolean arithmetic.

	David

> 
> > --- a/lib/glob.c
> > +++ b/lib/glob.c
> > @@ -96,7 +96,8 @@ bool __pure glob_match(char const *pat, char const *str)
> >  					class += 2;
> >  					/* Any special action if a > b? */
> >  				}
> > -				match |= (a <= c && c <= b);
> > +				if (a <= c && c <= b)
> > +					match = true;
> >  			} while ((a = *class++) != ']');
> >  
> >  			if (match == inverted)  
> 
> But if we're concerned about bool abuse, what's this?
> 
> 			bool match = false, inverted = (*pat == '!');
> 			char const *class = pat + inverted;
> 
>