fts_alloc
if ((parent = fts_alloc(sp, "", 0)) == NULL)
p = fts_alloc(sp, *argv, len);
if ((sp->fts_cur = fts_alloc(sp, "", 0)) == NULL)
static FTSENT *fts_alloc(FTS *, char *, size_t);
if ((p = fts_alloc(sp, dp->d_name, dnamlen)) == NULL)