Re: [PATCH v8 02/10] lib: kstrtox: add kstrntoull() helper

[Rodrigo Alencar]

On 26/03/04 10:16AM, David Laight wrote:
> On Tue, 03 Mar 2026 13:27:07 +0000
> Rodrigo Alencar via B4 Relay <devnull+rodrigo.alencar.analog.com@xxxxxxxxxx> wrote:
> 
> > From: Rodrigo Alencar <rodrigo.alencar@xxxxxxxxxx>
> > 
> > Add kstrntoull() function, which converts a string to an ULL with a max
> > character limit. The function is an alternative integer parsing function
> > that does not require a null-terminated string. It becomes a better option
> > over simple_strtoull() or kstrtoull() when parsing integers from a buffer
> > with custom delimiters without having to create temporary copies.
> > The function is consumed inside the implementation _kstrtoull(),
> > promoting reuse.
> 
> If you've got custom delimiters use a function that returns a pointer
> to the character that terminated the conversion.
> They save you having to find the delimiter as well as taking a copy.

understood, how about this prototype then:

const char __must_check *kstrntoull(const char *s, unsigned int base,
				    unsigned long long *res, size_t max_chars); 

to be used like:

	end = kstrntoull(s, base, &res, INT_MAX);
	if (IS_ERR(end)) {
		/* return or handle error */
		return PTR_ERR(end);
	}

the name itself is still under discussion.

-- 
Kind regards,

Rodrigo Alencar