void xfunlock(int lockid);
void xfclose(XFILE *xfp);
int xgettok(XFILE *xfp, char sepa, char *tok, int len);
-char xgetc(XFILE *xfp);
-void xungetc(char c, XFILE *xfp);
+int xgetc(XFILE *xfp);
+void xungetc(int c, XFILE *xfp);
void xskip(XFILE *xfp, char *str);
char xskipcomment(XFILE *xfp);