lkml.org 
[lkml]   [2019]   [Jul]   [24]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
/
SubjectRe: [PATCH 1/2] string: Add stracpy and stracpy_pad mechanisms
From
Date
On 24/07/2019 14.05, Yann Droneaud wrote:
> Hi,
>

> Beware that snprintf(), per C standard, is supposed to return the
> length of the formatted string, regarless of the size of the
> destination buffer.
>
> So encouraging developper to write something like code below because
> snprintf() in kernel behave in a non-standard way,

The kernel's snprintf() does not behave in a non-standard way, at least
not with respect to its return value. It doesn't support %n or floating
point, of course, and there are some quirks regarding precision (see
lib/test_printf.c for details).

There's the non-standard scnprintf() for getting the length of the
formatted string, which can safely be used in an append loop. Or one can
use the seq_buf API.

Rasmus

\
 
 \ /
  Last update: 2019-07-24 15:09    [W:0.084 / U:21.612 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site