#if HAVE_MBTOWC && HAVE_MBLEN
#define reset_mbytes(state) mblen(NULL, 0), mbtowc(NULL, NULL, 0)
#define count_mbytes(buffer,length,state) mblen(buffer,length)
#define check_mbytes(wch,buffer,length,state) \
#if HAVE_MBTOWC && HAVE_MBLEN
#define reset_mbytes(state) mblen(NULL, 0), mbtowc(NULL, NULL, 0)
#define count_mbytes(buffer,length,state) mblen(buffer,length)
#define check_mbytes(wch,buffer,length,state) \