| rtapi_snprintf, rtapi_vsnprintf − Perform snprintf-like string formatting | 
| int rtapi_snprintf(char *buf, unsigned long int size, const char *fmt, ...) | 
| int rtapi_vsnprintf(char *buf, unsigned long int size, const char *fmt, va_list apfB) | 
| 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. | 
| May be called from user, init/cleanup, and realtime code. | 
| The number of characters written to buf. | 
| printf(3) |