chfont
e_code = chfont(&bodyf, &keywordf, e_code);
e_code = chfont(&keywordf, &bodyf, e_code);
char *chfont(struct fstate *, struct fstate *, char *);
e_token = chfont(&bodyf, &stringf, e_token);
e_token = chfont(&stringf, &bodyf, e_token - 1);