snprintf circular call issue

[Spargue]

When using lvgl, lv_snprintf, and snprintf become circuler calls.
lv_conf.h

#define lv_snprintf               snprintf
#define lv_vsnprintf              vsnprintf

This causes a stack overflow and can be triggered by a Log overflow and dropping messages.

[Spargue]

Just to add some more context, this occurs when lv_printf is set to use CLIB and runs OK when set to use internal.
lv_vsnprintf is replaced with vsnprintf in the preprocessor and creates a loop when using Log functions. Specifically, when a message is dropped. log backend calls snprintf which is linked to lv_snprintf via #define and calls a circular call.

[JarmouniA]

Cc @faxe1008

[faxe1008]

@Spargue can you give short example how its reproducible?

[Spargue]

enable lvgl, and set printf to clib.
use snprintf or cause a log overflow where packets are dropped.
the file in lvgl (lvgl/src/stdlib/clib/lv_sprintf_clib.c) also includes lv_config.h which has #defines
int lv_vsnprintf(char * buffer, size_t count, const char * format, va_list va)
becomes int vsnprintf(char * buffer, size_t count, const char * format, va_list va)