/* Function prototype. */
static int sr_logv(void *cb_data, int loglevel, const char *format,
va_list args);
/* Pointer to the currently selected log callback. Default: sr_logv(). */
/* Function prototype. */
static int sr_logv(void *cb_data, int loglevel, const char *format,
va_list args);
/* Pointer to the currently selected log callback. Default: sr_logv(). */