Re: [PATCH v3] sscanf: implement basic character sets

[Rasmus Villemoes]

On Tue, Feb 23 2016, Rasmus Villemoes <linux@xxxxxxxxxxxxxxxxxx> wrote:

> On that note, it seems that your field width handling is off-by-one.

Sorry about that, it's me who's off-by-one.

Rasmus


> To get rid of the allocation, why not use a small bitmap? Something like
>
> {
>   char *s = (char *)va_arg(args, char *);
>   DECLARE_BITMAP(map, 256) = {0};
>   bool negate = false;
>
>   /* a field width is required, and must provide room for at least a '\0' */
>   if (field_width <= 0)
>     return num;
>

should be

/* a field width is required */
if (field_width < 0)

and

>   while (test_bit((u8)*str, map) && --field_width) {

should be field_width--, exactly as in your code.