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edit: Report unit key 'U' failure more nicely, and avoid oops

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Two failure modes:

* When the argument is negative, edit() attempts an invalid write,
  triggering an oops.  edit() detects the write failure, and returns
  RET_FAIL.

  Detect the negative argument instead, and return RET_SYN, like we do
  for other invalid edit arguments.

* When the argument requires the table to be extended, but the
  extension fails, edit() returns RET_FAIL.

  Additionally report the failure to the player.

Signed-off-by: Markus Armbruster <armbru@pond.sub.org>
This commit is contained in:
Markus Armbruster 2013-01-27 15:43:39 +01:00
parent ccd4368679
commit 1f950f6a70
3 changed files with 9 additions and 12 deletions
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12
src/lib/commands/edit.c
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@ -193,8 +193,6 @@ edit(void)
return RET_FAIL;
if ((err = edit_ship(&ship, key, ptr)) != RET_OK)
return err;
if (!ef_ensure_space(EF_SHIP, ship.shp_uid, 50))
return RET_FAIL;
if (!putship(ship.shp_uid, &ship))
return RET_FAIL;
break;
@ -203,8 +201,6 @@ edit(void)
return RET_FAIL;
if ((err = edit_land(&land, key, ptr)) != RET_OK)
return err;
if (!ef_ensure_space(EF_LAND, land.lnd_uid, 50))
return RET_FAIL;
if (!putland(land.lnd_uid, &land))
return RET_FAIL;
break;
@ -213,8 +209,6 @@ edit(void)
return RET_FAIL;
if ((err = edit_plane(&plane, key, ptr)) != RET_OK)
return err;
if (!ef_ensure_space(EF_PLANE, plane.pln_uid, 50))
return RET_FAIL;
if (!putplane(plane.pln_uid, &plane))
return RET_FAIL;
break;
@ -749,6 +743,12 @@ edit_unit(struct empobj *unit, char *key, char *p,
switch (toupper(*key)) {
case 'U':
if (arg < 0)
return RET_SYN;
if (!ef_ensure_space(unit->ef_type, arg, 50)) {
pr("Can't copy to %s #%d\n", ef_nameof(unit->ef_type), arg);
return RET_FAIL;
}
ef_set_uid(unit->ef_type, unit, arg);
break;
case 'O':