size_t xread(int fd, void *data, size_t szdata);
size_t xwrite(int fd, const void *data, size_t szdata);
+extern tfc_yesno xexit_no_nl;
+
void xerror(tfc_yesno noexit, tfc_yesno noerrno, tfc_yesno nostats, const char *fmt, ...);
void xexit(int status);
void usage(void);