rtapi_snprintf(3)

As for snprintf(3) or vsnprintf(3).

These functions work like the standard C printf functions, except that a reduced set of formatting operations are supported.

In particular: formatting of long long values is not supported. Formatting of floating-point values is done as though with %A even when other formats like %f are specified.

May be called from non-realtime, init/cleanup, and realtime code.

The number of characters written to buf.

printf(3)