diffline
STAILQ_ENTRY(diffline) diffentries;
static void freediff(struct diffline *);
static STAILQ_HEAD(, diffline) diffhead = STAILQ_HEAD_INITIALIZER(diffhead);
struct diffline *diffp;
if (!(diffp = malloc(sizeof(struct diffline))))
freediff(struct diffline *diffp)
struct diffline *diffp;