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Discourage the use of LIBC_PRINT_EXTENSION #14378

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Merged
xiaoxiang781216 merged 1 commit into from
Oct 17, 2024
Merged

Discourage the use of LIBC_PRINT_EXTENSION #14378

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13 changes: 12 additions & 1 deletion libs/libc/stdio/Kconfig
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Original file line number Diff line number Diff line change
Expand Up @@ -110,6 +110,17 @@ config LIBC_PRINT_EXTENSION
bool
default n
---help---
Enables vsprintf supports using "%p*" to print.
Enables non-standard "%p*" extensions for the printf family.

CAVEAT: If your system is using any of the printf C family
functions, it's probably unsafe to enable this option because
the extension is not compatible with the C standard. Namely,
an ordinary character following a "%p" conversion is interpreted
in a non-standard way, which might crash the code which expects
the standard semantics. For that reason, in the future versions
of NuttX, this extension might be removed, or changed in an
API-incompatible way to avoid conflicts with the standards.
(Eg. use different characters for converions specifiers,
or switch to a completely separate API, say "nuttx_printf".)

endmenu #Standard C I/O