From: David Laight <david.laight.linux@gmail.com>
To: Rodrigo Alencar <455.rodrigo.alencar@gmail.com>
Cc: Andy Shevchenko <andriy.shevchenko@intel.com>,
rodrigo.alencar@analog.com, linux-kernel@vger.kernel.org,
linux-iio@vger.kernel.org, devicetree@vger.kernel.org,
linux-doc@vger.kernel.org, Jonathan Cameron <jic23@kernel.org>,
David Lechner <dlechner@baylibre.com>,
Andy Shevchenko <andy@kernel.org>,
Lars-Peter Clausen <lars@metafoo.de>,
Michael Hennerich <Michael.Hennerich@analog.com>,
Rob Herring <robh@kernel.org>,
Krzysztof Kozlowski <krzk+dt@kernel.org>,
Conor Dooley <conor+dt@kernel.org>,
Jonathan Corbet <corbet@lwn.net>,
Andrew Morton <akpm@linux-foundation.org>
Subject: Re: [PATCH v8 02/10] lib: kstrtox: add kstrntoull() helper
Date: Fri, 20 Mar 2026 14:44:59 +0000 [thread overview]
Message-ID: <20260320144459.705c8e60@pumpkin> (raw)
In-Reply-To: <qsquhriyrepndxwexox35oi5i7v4klb64lajuk3j3pfozkjiew@fp55l4znck4o>
On Fri, 20 Mar 2026 12:41:57 +0000
Rodrigo Alencar <455.rodrigo.alencar@gmail.com> wrote:
...
> > Some (stupid) thoughts loudly. IIUC even if we implement '%g' in scanf(), it
> > wont help you as you want to have more precise values. Do I get it correct?
>
> If I am parsing 3.14159265359 with 6 decimal precision I want to stop at:
>
> frac = 141592
> int = 3
>
> and ignore the rest.
>
If you add an 'upper limit' parameter and return a pointer to the digit
that exceeds the limit (which would normally get processed as a syntax error)
then you could have:
int_part = strtoull(pi, &end, ~0ull, 10);
if (end[0] == '.' && isdigit(end[1])) {
frac = strtoull(end + 2, &end, 999999, 10);
while (isdigit(*end))
end++;
}
Passing in the limit should help strtol() are strtoi() as well.
David
next prev parent reply other threads:[~2026-03-20 14:45 UTC|newest]
Thread overview: 26+ messages / expand[flat|nested] mbox.gz Atom feed top
2026-03-03 13:27 [PATCH v8 00/10] ADF41513/ADF41510 PLL frequency synthesizers Rodrigo Alencar via B4 Relay
2026-03-03 13:27 ` [PATCH v8 01/10] dt-bindings: iio: frequency: add adf41513 Rodrigo Alencar via B4 Relay
2026-03-03 13:27 ` [PATCH v8 02/10] lib: kstrtox: add kstrntoull() helper Rodrigo Alencar via B4 Relay
2026-03-03 13:49 ` Andy Shevchenko
2026-03-03 14:16 ` Rodrigo Alencar
2026-03-04 10:02 ` Rodrigo Alencar
2026-03-20 11:16 ` Rodrigo Alencar
2026-03-20 11:50 ` Andy Shevchenko
2026-03-20 12:08 ` Rodrigo Alencar
2026-03-20 12:24 ` Andy Shevchenko
2026-03-20 12:41 ` Rodrigo Alencar
2026-03-20 14:17 ` Andy Shevchenko
2026-03-20 14:44 ` David Laight [this message]
2026-03-04 10:16 ` David Laight
2026-03-04 11:41 ` Rodrigo Alencar
2026-03-10 9:26 ` Rodrigo Alencar
2026-03-10 10:50 ` David Laight
2026-03-10 11:30 ` Rodrigo Alencar
2026-03-03 13:27 ` [PATCH v8 03/10] lib: test-kstrtox: add tests for kstrntoull() Rodrigo Alencar via B4 Relay
2026-03-03 13:27 ` [PATCH v8 04/10] iio: core: add fixed point parsing with 64-bit parts Rodrigo Alencar via B4 Relay
2026-03-03 13:27 ` [PATCH v8 05/10] iio: test: add kunit test for fixed-point parsing Rodrigo Alencar via B4 Relay
2026-03-03 13:27 ` [PATCH v8 06/10] iio: frequency: adf41513: driver implementation Rodrigo Alencar via B4 Relay
2026-03-03 13:27 ` [PATCH v8 07/10] iio: frequency: adf41513: handle LE synchronization feature Rodrigo Alencar via B4 Relay
2026-03-03 13:27 ` [PATCH v8 08/10] iio: frequency: adf41513: features on frequency change Rodrigo Alencar via B4 Relay
2026-03-03 13:27 ` [PATCH v8 09/10] docs: iio: add documentation for adf41513 driver Rodrigo Alencar via B4 Relay
2026-03-03 13:27 ` [PATCH v8 10/10] Documentation: ABI: testing: add common ABI file for iio/frequency Rodrigo Alencar via B4 Relay
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