int ThaiIsMiddleLineCh __PROTO((char ch));
int ThaiPixel2Col __PROTO((int x, int y));
int ThaiCol2Pixel __PROTO((int col, char *start));
int ThaiUpdateMap2 __PROTO((text_t *stp, text_t *dtp, rend_t *srp, rend_t *drp, char *map, int len));
int ThaiUpdateMap __PROTO((text_t *stp, text_t *dtp, rend_t *srp, rend_t *drp, char *map, int len));
int Thai_CursorArea __PROTO((char *stp, char *map, int len, int col));
int Thai_ColMaxPaint __PROTO((text_t *str, int len));