RkMapPhonogram - perform Romaji-kana conversion by using a specified Romaji-kana conversion table

#include <canna/RK.h>
int RkMapPhonogram(romaji, dst, maxdst, src, srclen, flags, ulen, 
                  dlen, tlen, rule)
struct RkRxDic *romaji;
unsigned char *dst;
int maxdst;
unsigned char *src;
int srclen;
int flags;
int *ulen;
int *dlen;
int *tlen;
int *rule;

RkMapPhonogram performs Romaji-kana conversion by using a specified Romaji-kana conversion table. romaji specifies a pointer to the Romaji-kana conversion table that has been returned by RkOpenRoma(3). RkMapPhonogram interprets the srclen bytes of contiguous data starting at the area src as a Romaji character string and searches through the Romaji-kana conversion table for the rule of Romaji-kana conversion that matches the beginning of the Romaji character string. If the corresponding conversion rule is found, the area dst is loaded with the corresponding kana character string, with dlen being set to its byte length. The resulting character string is truncated when its byte length exceeds maxdst -1.

flags is a combination of the following Romaji-kana conversion flags connected by or:

RK_SOKUON

Enables gemination, in which a sequence of two occurrences of the same character, xx, is converted to small kana character "tsu" only if it is not defined in the Romaji-kana conversion table file. This process provides for situations in which an obsolete Romaji-kana conversion table is used.

RK_FLUSH

Converts all Romaji characters compulsorily. Useful for handling n appearing at the end of a character string.

ulen, dlen, and tlen are used to manage the progress of Romaji-kana conversion.

For example, if the character string "tt" is given to RkMapPhonogram, the first "t" is submitted to Romaji-kana conversion, with dst being set to small kana character "tsu". The remaining "t" is put to reuse for Romaji-kana conversion. When "a" is entered subsequently, it is combined with the "t" left from the previous run of RkMapPhonogram to generate kana character "ta".

ulen is set to the byte length of the characters from src used for Romaji-kana conversion.

dlen is set to the byte length of the kana characters derived from Romaji-kana conversion.

tlen is set to the byte length of the character string to be used in the next run of Romaji-kana conversion. The character string led by tlen is placed after the character string resulting from Romaji-kana conversion in the dst buffers.

If null pointers are specified in ulen, dlen, and tlen, these parameters do not return any values and are simply ignored.

rule is used to exchange information about the rule of Romaji-kana conversion. When calling RkMapPhonogram for the first time, specify a pointer to a variable loaded with 0. Upon return from the first call to RkMapPhonogram, that variable is loaded with internal information about the rule of Romaji-kana conversion, in place of 0. To continue Romaji-kana conversion, specify the same pointer to the variable to RkMapPhonogram.

This function returns information about whether the character string set in dst has been converted by using a rule existing in the Romaji-kana conversion table or not. The function returns 1 if a rule existing in the Romaji-kana conversion table has been used; otherwise, it returns 0.