Re: Avoid overhead with fprintf related functions

Em sex., 9 de set. de 2022 às 10:45, Ranier Vilela <ranier(dot)vf(at)gmail(dot)com>
escreveu:

> Based on work in [1].
> According to https://cplusplus.com/reference/cstdio/fprintf/
> The use of fprintf is related to the need to generate a string based on a
> format, which should be different from "%s".
> Since fprintf has overhead when parsing the "format" parameter, plus all
> the trouble of checking the va_arg parameters.
> I think this is one of the low fruits available and easy to reap.
> By replacing fprintf with its equivalents, fputs and fputc,
> we avoid overhead and increase security [2] and [3].
>
> The downside is a huge big churm, which unfortunately will occur.
> But, IHMO, I think the advantages are worth it.
> Note that behavior remains the same, since fputs and fputc do not change
> the expected behavior of fprintf.
>
> A small performance gain is expected, mainly for the client, since there
> are several occurrences in some critical places, such as
> (usr/src/fe_utils/print.c).
>
> Patch attached.
> This pass check-world.
>
Rechecked for the hundredth time.
One typo.

regards,
Ranier Vilela