strspct
availblks == 0 ? full : strspct(pb, sizeof(pb), used,
strspct(pb, sizeof(pb), used, availblks, 0));
strspct(pb, sizeof(pb), used, inodes, 0));
char *strspct(char *, size_t, intmax_t, intmax_t, size_t);
ATF_TC(strspct);
ATF_TC_HEAD(strspct, tc)
ATF_TC_BODY(strspct, tc)
ATF_TP_ADD_TC(tp, strspct);
const char *have = strspct(buf + 1, bufsiz, num, den, digits);