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