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vere: fix u3v_lily bounds checking

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Before this, u3v_lily would erroneously accept atoms bigger than 64 bits
that, when truncated to 64 bits, were 31-bit numbers.

Decided to drop _cv_mole altogether. Another option would be to write a
u3r_chub_fit, write _cv_mole in terms of that, and check width in
u3v_lily as it currently does.

I tried to add a test case, but it seems that tests don't have access to
an ivory pill for +scot / +slaw. This would be the test case, more or
less:

    {
      c3_l lit_l;
      c3_w big_w[] = {0, 0, 1};
      u3_atom big = u3i_words(3, big_w);
      u3_noun cod = u3dc("scot", c3__ux, big);

      if ( c3y == u3v_lily(c3__ux, cod, &lit_l) ) {
        printf("fail\n");
      }
    }

(The refcounting was also messed up, possibly from my refactor to use
+slaw instead of +slay, but this seems to have been unrelated.)
This commit is contained in:
Jōshin 2021-12-26 06:44:54 +00:00
parent d64674c0e8
commit 2526c4b59d
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GPG Key ID: A8BE5A9A521639D0
1 changed files with 14 additions and 35 deletions
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49
pkg/urbit/noun/vortex.c
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@ -193,47 +193,26 @@ u3v_peek(u3_noun sam)
return u3n_slam_on(fun, sam);
}
/* _cv_mole(): parse simple atomic mole.
*/
static c3_o
_cv_mole(u3_noun fot,
u3_noun san,
c3_d* ato_d)
{
u3_noun uco = u3dc("slaw", fot, san);
u3_noun p_uco, q_uco;
if ( (c3n == u3r_cell(uco, &p_uco, &q_uco)) ||
(u3_nul != p_uco) )
{
u3l_log("strange mole %s\n", u3r_string(san));
u3z(fot); u3z(uco); return c3n;
}
else {
*ato_d = u3r_chub(0, q_uco);
u3z(fot); u3z(uco); return c3y;
}
}
/* u3v_lily(): parse little atom.
*/
c3_o
u3v_lily(u3_noun fot, u3_noun txt, c3_l* tid_l)
{
c3_d ato_d;
c3_w wad_w;
u3_noun uco = u3dc("slaw", fot, u3k(txt));
u3_noun p_uco, q_uco;
if ( c3n == _cv_mole(fot, txt, &ato_d) ) {
return c3n;
} else {
if ( ato_d >= 0x80000000ULL ) {
return c3n;
} else {
*tid_l = (c3_l) ato_d;
return c3y;
}
if ( (c3n == u3r_cell(uco, &p_uco, &q_uco)) ||
(u3_nul != p_uco) ||
!u3r_word_fit(&wad_w, q_uco) ||
(wad_w & 0x80000000) )
{
u3l_log("strange lily %s\n", u3r_string(txt));
u3z(txt); u3z(uco); return c3n;
}
else {
*tid_l = (c3_l)wad_w;
u3z(txt); u3z(uco); return c3y;
}
}