RkCvtRoma - convert an entire character string from Romaji to kana
by iteratively using RkMapRoma
#include <canna/RK.h>
int RkCvtRoma(romaji, dst, maxdst, src, srclen, flags)
struct RkRxDic *romaji;
unsigned char *dst;
int maxdst;
unsigned char *src;
int srclen;
int flags;
RkCvtRoma converts an entire src character string from Romaji to
kana by iteratively using RkMapRoma. The parameters are similar to
RkMapRoma(3), except that status is wanting.
This function returns the byte length of the conversion result.