#include <sp/sphere.h>int sp_tell(SP_FILE *sp){    char *proc="sp_tell " SPHERE_VERSION_STR;    if (sp == SPNULL)	return_err(proc,101,-1,"Null SPFILE structure");    if (sp->open_mode == SP_mode_read){ 	return_success(proc,0,sp->read_spifr->waveform->samples_read,"ok");    } else if (sp->open_mode == SP_mode_write) {	return_success(proc,0,sp->write_spifr->waveform->samples_written,"ok");    } else	return_err(proc,101,-1,"file not opened for read or write");}