Bound wizard-created Which against its item table (closes #10) #20

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clawbot merged 1 commits from fix/wizard-which-bounds into main 2026-08-09 07:34:54 +02:00

Conversation 6 Commits 1 Files Changed 12 +705 -13

clawbot commented 2026-08-09 07:09:49 +02:00

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Fixes the only known way to crash the game from normal wizard-mode input.

The bug

createObj stored the raw 0-f nibble as Object.Which with no bounds
check, so wizard mode -> C -> / -> f produced a wand numbered 15
against a 14-entry table and panicked in fixStick.

Input outside 0-f overshoots much further rather than going negative:
readchar returns a byte (game/io.go:169), so the int(ch-'a') + 10
branch is byte arithmetic and wraps — 'A' gives int(224) + 10 == 234
and '!' gives int(192) + 10 == 202 — and panicked the same way, further
past the end. (This is easy to miss precisely because the compiler would
reject the same expression written with constants: byte('A') - 'a'
overflows byte at compile time. Only because ch is a runtime variable
does it wrap silently.) Nothing on the keyboard path can produce a negative
Which; only a decoded save file can, Which being a plain int in the
gob stream.

C's create_obj() was equally unchecked, but every C consumer was either a
switch (defined for any value) or a static-array read past the end
(undefined, and survivable in practice). Since refactor step 8 made one game
one process, the Go panic kills the game outright and leaves the terminal in
raw mode — so a survivable C quirk became a hard crash.

The fix

Reject at the two boundaries a bad Which can enter through:

• createObj refuses an out-of-range choice with a message built from C's own
  type_name() vocabulary (ObjectKind.String()) and adds nothing to the
  pack. C had no defined behavior here to be faithful to, so this is a clean
  rejection rather than an emulated garbage read, recorded as a deliberate
  divergence in a code comment. Weapons validate against NumWeaponTypes
  rather than the table size, because WeaponFlame owns a name-table slot but
  no init_dam[] row.
• Restore refuses a snapshot describing such an object (new ErrSaveCorrupt)
  instead of loading a game that would explode later. It walks the level
  objects, the player's pack, and every monster's pack. A rejected file is left
  on disk rather than deleted. This is also the only path a genuinely negative
  Which can arrive by, so it is what the Which >= 0 arm of hasValidWhich
  defends against.

Defensive guards behind those, all built on the new whichLimit /
hasValidWhich pair, at every dispatch the issue names:

Site	Guarded behavior
sticks.go zapHandlers[…]	zapHandler returns no handler: no effect, Charges-- still runs — exactly what non-MASTER C did, matching no case and still running o_charges--
potions.go quaffHandlers[…]	quaffHandler returns no handler
scrolls.go readHandlers[…]	readHandler returns no handler
potions.go / scrolls.go callIt(&Items.X[Which])	call-it prompt skipped
readIdentify's idType[…]	new identifyType accessor. idType is shorter than the scroll table keying it, but no scroll that can reach readIdentify overshoots it (readHandlers registers readIdentify only for kinds 5-9, and idType holds 10 entries), so this bound is defensive against a future table resize, not a live one
things.go nameScroll	hoisted to inventoryName, so one check covers the listed scroll-title read plus its potion-color, ring-stone, wand-material, weapon and armor siblings; falls back to the bare category name
wizard.go aClass[Which]	new gameData.armorClass, used at all four a_class[] reads (wizard.go, rip.go, things.go, potions.go)
weapons.go initWeaps[which]	initWeapon leaves the object untouched for a kind with no table row
sticks.go WandType[Which] in fixStick	out-of-range takes the existing non-staff branch (1x1); the charge switch below already has a default

One site beyond the issue's table got the same treatment: objectWorth (the
death-screen appraisal) reads the identical per-kind tables through
ringWorth/wandWorth, so it carries the same hoisted guard.

This is not an exhaustive sweep of every per-kind table read in the
tree. callTarget (game/command.go:801-807) and setKnow
(game/wizard.go:208) index the same tables unguarded. Neither is reachable
with a malformed object once the two boundary rejections above are in place,
and both are deliberately out of scope here rather than folded in.

No in-range input changes behavior, and no guard consumes a random number —
the rejection precedes every rnd() call in createObj.

Verification

• make check green: make fmt-check clean, golangci-lint 0 issues,
  full suite passing under -timeout 30s -race -cover (game package coverage
  48.4%).
• TestSeedCompatItemTables passes untouched — the golden was not regenerated,
  confirming the RNG consumption order is unchanged.
• A dedicated TestCreateObjKeepsRNGSequence asserts Rng.Seed is identical
  after a rejected creation.
• The wrapping was confirmed empirically, not just reasoned about. In a
  throwaway copy with the createObj guard neutralized, a wand created from
  '!' comes back with Which == 202, and the runtime arithmetic reports
  'A' -> 234, '!' -> 202. The copy was discarded.
• Each guard was confirmed load-bearing: reverting the createObj and
  fixStick checks in place makes the new tests fail with
  index out of range [15] with length 14 and
  index out of range [14] with length 14, i.e. the reported panic. Dropping
  the Which >= 0 arm of hasValidWhich makes the new negative-Which
  restore subtest fail with Restore error = <nil>, want ErrSaveCorrupt, so
  that arm is exercised rather than dead weight. The guards were restored from
  a byte-for-byte copy afterwards.
• New game/wizard_test.go (//nolint:testpackage header, t.Parallel() in
  every test and subtest): the exact reproducer; a rejection sweep over every
  indexed kind including the wrapped values from input outside 0-f; an
  acceptance sweep proving valid choices still build the right item (0, 9,
  and each kind's last legal index); one no-panic test per guarded family
  (wand / potion / scroll / armor / weapon); the fixStick crash site; the
  corrupt-save rejection over both the wrapped values (234, 202) and a
  negative Which; and a check that whichLimit still agrees with the
  actual table sizes, so a future table resize cannot silently desync the
  bounds.
• .golangci.yml untouched — still sha256
  021cc83f4e6fc7c31b95b34b846723dfcf20b66b7baeea1dc40406e643346bcb.
• c-master was read only via git show; no checkout, no modification.

Notes for review

• Adjacent to #13, deliberately not folded in. The wand guard lands on a
  nil handler, which is the shape C's otherwise arm had without MASTER.
  Restoring "what a bizarre schtick!" is now a one-line else on that if,
  but it belongs to #13 and is left there.
• A scroll cannot be driven out of range by an in-prompt choice:
  NumScrollTypes is 18 and the prompt tops out at f (15), so the scroll
  case is only reachable via input outside 0-f, which wraps. The test notes
  this.
• Divergence noticed but not fixed (flagging for a scope call rather than
  fixing drive-by): createObj still accepts an unrecognized type glyph,
  which objectKindForGlyph maps to KindNone, and cheerfully adds that
  object to the pack. C stored the raw character as o_type and did the same,
  so this is faithful and does not panic — the guards above make KindNone
  name itself "bizarre thing" rather than crash — but the result is an inert
  unusable pack entry.

TODO.md gets a Completed Steps entry in the same commit; Next Step is
deliberately not rotated, per the precedent set on PR #9 for work arriving out
of band via an issue.

Fixes the only known way to crash the game from normal wizard-mode input. ## The bug `createObj` stored the raw `0-f` nibble as `Object.Which` with no bounds check, so wizard mode -> `C` -> `/` -> `f` produced a wand numbered 15 against a 14-entry table and panicked in `fixStick`. Input outside `0-f` overshoots much further rather than going negative: `readchar` returns a `byte` (`game/io.go:169`), so the `int(ch-'a') + 10` branch is **byte arithmetic and wraps** — `'A'` gives `int(224) + 10 == 234` and `'!'` gives `int(192) + 10 == 202` — and panicked the same way, further past the end. (This is easy to miss precisely because the compiler would reject the same expression written with constants: `byte('A') - 'a'` overflows `byte` at compile time. Only because `ch` is a runtime variable does it wrap silently.) Nothing on the keyboard path can produce a negative `Which`; only a decoded save file can, `Which` being a plain `int` in the gob stream. C's `create_obj()` was equally unchecked, but every C consumer was either a `switch` (defined for any value) or a static-array read past the end (undefined, and survivable in practice). Since refactor step 8 made one game one process, the Go panic kills the game outright and leaves the terminal in raw mode — so a survivable C quirk became a hard crash. ## The fix **Reject at the two boundaries** a bad `Which` can enter through: - `createObj` refuses an out-of-range choice with a message built from C's own `type_name()` vocabulary (`ObjectKind.String()`) and adds nothing to the pack. C had no defined behavior here to be faithful to, so this is a clean rejection rather than an emulated garbage read, recorded as a deliberate divergence in a code comment. Weapons validate against `NumWeaponTypes` rather than the table size, because `WeaponFlame` owns a name-table slot but no `init_dam[]` row. - `Restore` refuses a snapshot describing such an object (new `ErrSaveCorrupt`) instead of loading a game that would explode later. It walks the level objects, the player's pack, and every monster's pack. A rejected file is left on disk rather than deleted. This is also the only path a genuinely negative `Which` can arrive by, so it is what the `Which >= 0` arm of `hasValidWhich` defends against. **Defensive guards** behind those, all built on the new `whichLimit` / `hasValidWhich` pair, at every dispatch the issue names: | Site | Guarded behavior | | --- | --- | | `sticks.go` `zapHandlers[…]` | `zapHandler` returns no handler: no effect, `Charges--` still runs — exactly what non-`MASTER` C did, matching no case and still running `o_charges--` | | `potions.go` `quaffHandlers[…]` | `quaffHandler` returns no handler | | `scrolls.go` `readHandlers[…]` | `readHandler` returns no handler | | `potions.go` / `scrolls.go` `callIt(&Items.X[Which])` | call-it prompt skipped | | `readIdentify`'s `idType[…]` | new `identifyType` accessor. `idType` is shorter than the scroll table keying it, but no scroll that can reach `readIdentify` overshoots it (`readHandlers` registers `readIdentify` only for kinds 5-9, and `idType` holds 10 entries), so this bound is **defensive against a future table resize, not a live one** | | `things.go` `nameScroll` | hoisted to `inventoryName`, so one check covers the listed scroll-title read plus its potion-color, ring-stone, wand-material, weapon and armor siblings; falls back to the bare category name | | `wizard.go` `aClass[Which]` | new `gameData.armorClass`, used at all four `a_class[]` reads (`wizard.go`, `rip.go`, `things.go`, `potions.go`) | | `weapons.go` `initWeaps[which]` | `initWeapon` leaves the object untouched for a kind with no table row | | `sticks.go` `WandType[Which]` in `fixStick` | out-of-range takes the existing non-staff branch (`1x1`); the charge switch below already has a `default` | One site beyond the issue's table got the same treatment: `objectWorth` (the death-screen appraisal) reads the identical per-kind tables through `ringWorth`/`wandWorth`, so it carries the same hoisted guard. This is **not** an exhaustive sweep of every per-kind table read in the tree. `callTarget` (`game/command.go:801-807`) and `setKnow` (`game/wizard.go:208`) index the same tables unguarded. Neither is reachable with a malformed object once the two boundary rejections above are in place, and both are deliberately out of scope here rather than folded in. **No in-range input changes behavior, and no guard consumes a random number** — the rejection precedes every `rnd()` call in `createObj`. ## Verification - `make check` green: `make fmt-check` clean, `golangci-lint` **0 issues**, full suite passing under `-timeout 30s -race -cover` (game package coverage 48.4%). - `TestSeedCompatItemTables` passes untouched — the golden was not regenerated, confirming the RNG consumption order is unchanged. - A dedicated `TestCreateObjKeepsRNGSequence` asserts `Rng.Seed` is identical after a rejected creation. - **The wrapping was confirmed empirically, not just reasoned about.** In a throwaway copy with the `createObj` guard neutralized, a wand created from `'!'` comes back with `Which == 202`, and the runtime arithmetic reports `'A'` -> 234, `'!'` -> 202. The copy was discarded. - **Each guard was confirmed load-bearing**: reverting the `createObj` and `fixStick` checks in place makes the new tests fail with `index out of range [15] with length 14` and `index out of range [14] with length 14`, i.e. the reported panic. Dropping the `Which >= 0` arm of `hasValidWhich` makes the new negative-`Which` restore subtest fail with `Restore error = <nil>, want ErrSaveCorrupt`, so that arm is exercised rather than dead weight. The guards were restored from a byte-for-byte copy afterwards. - New `game/wizard_test.go` (`//nolint:testpackage` header, `t.Parallel()` in every test and subtest): the exact reproducer; a rejection sweep over every indexed kind including the wrapped values from input outside `0-f`; an acceptance sweep proving valid choices still build the right item (`0`, `9`, and each kind's last legal index); one no-panic test per guarded family (wand / potion / scroll / armor / weapon); the `fixStick` crash site; the corrupt-save rejection over both the wrapped values (234, 202) and a negative `Which`; and a check that `whichLimit` still agrees with the actual table sizes, so a future table resize cannot silently desync the bounds. - `.golangci.yml` untouched — still sha256 `021cc83f4e6fc7c31b95b34b846723dfcf20b66b7baeea1dc40406e643346bcb`. - `c-master` was read only via `git show`; no checkout, no modification. ## Notes for review - **Adjacent to #13, deliberately not folded in.** The wand guard lands on a `nil` handler, which is the shape C's `otherwise` arm had *without* `MASTER`. Restoring `"what a bizarre schtick!"` is now a one-line `else` on that `if`, but it belongs to #13 and is left there. - **A scroll cannot be driven out of range by an in-prompt choice**: `NumScrollTypes` is 18 and the prompt tops out at `f` (15), so the scroll case is only reachable via input outside `0-f`, which wraps. The test notes this. - **Divergence noticed but not fixed** (flagging for a scope call rather than fixing drive-by): `createObj` still accepts an unrecognized *type* glyph, which `objectKindForGlyph` maps to `KindNone`, and cheerfully adds that object to the pack. C stored the raw character as `o_type` and did the same, so this is faithful and does not panic — the guards above make `KindNone` name itself "bizarre thing" rather than crash — but the result is an inert unusable pack entry. `TODO.md` gets a Completed Steps entry in the same commit; `Next Step` is deliberately not rotated, per the precedent set on PR #9 for work arriving out of band via an issue.

clawbot added the needs-review label 2026-08-09 07:09:49 +02:00

clawbot added 1 commit 2026-08-09 07:09:49 +02:00

fix: bound wizard-created Which against its item table (closes #10) ... 9dbd9d11cb

createObj stored the raw 0-f nibble as Object.Which with no bounds
check, so wizard mode -> C -> / -> f made a wand numbered 15 against a
14-entry table and panicked in fixStick; input below 'a' or '0' went
negative and panicked the same way. C's create_obj() was equally
unchecked, but its consumers were either switches (defined for any
value) or static-array reads past the end (undefined, and survivable in
practice). Since one game is now one process, the Go panic kills the
game outright and leaves the terminal in raw mode.

Reject at the two boundaries a bad Which can enter through. createObj
now refuses an out-of-range choice with a message drawn from C's own
type_name() vocabulary and adds nothing to the pack, a deliberate
divergence recorded in a comment because C had no defined behavior here
to be faithful to. Restore refuses a snapshot describing such an object
(ErrSaveCorrupt) rather than loading a game that would explode later.

Behind those, whichLimit/hasValidWhich back defensive guards at every
dispatch the issue names: the quaffHandler/readHandler/zapHandler
accessors return no handler instead of indexing (for wands that is
exactly what non-MASTER C did, matching no case and still running
o_charges--), the callIt lore lookups, identifyType, armorClass for the
a_class[] reads, initWeapon against the missing init_dam[] row for
WeaponFlame, fixStick's ws_type[] read, and inventoryName and
objectWorth, hoisted so one check each covers the whole family of
per-kind name and appraisal tables.

No in-range input changes behavior and no guard consumes a random
number: the rejection precedes every rnd() call. TestSeedCompatItemTables
stays green untouched.

New game/wizard_test.go covers the exact reproducer, a rejection sweep
over every indexed kind including both negative-input forms, an
acceptance sweep proving valid choices still build the right item, one
no-panic test per guarded family, the fixStick crash site, the
corrupt-save rejection, and a check that whichLimit still agrees with
the table sizes. Each guard was confirmed load-bearing by reverting it
and watching the test panic.

TODO.md records the step; Next Step is deliberately left alone, since
this arrived out of band via an issue.

clawbot self-assigned this 2026-08-09 07:09:53 +02:00

clawbot commented 2026-08-09 07:10:18 +02:00

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What was built

One commit, 9dbd9d1, branched from main at eb31473.

Boundary rejection — the two places a malformed Which can enter the game:

• game/wizard.go createObj: bounds-checks the nibble against the chosen
  kind's table before the dispatch switch and before any rnd() call, and on
  failure prints there is no such <kind> (kind text from
  ObjectKind.String(), i.e. C's type_name() vocabulary) and returns without
  touching the pack. A block comment records why this diverges from 5.4.4.
• game/save.go Restore: new validateSnapshotObjects walks st.Objects,
  st.Player.Body.Pack, and every st.Monsters[i].Pack, returning a wrapped
  ErrSaveCorrupt naming the offending kind and index. The rejected file is
  left on disk rather than unlinked.

The predicate — game/object.go gains whichLimit(ObjectKind) int and
(*Object).hasValidWhich(), plus (*Object).wizardCanCreate() for the one
narrowing case. Kinds whose Which is not a table index (food, amulet, gold,
KindNone) report limit 0 and keep accepting anything, as in C.

Guards — game/tables.go gains four bounds-checked accessors on
gameData: quaffHandler, readHandler, zapHandler, identifyType, and
armorClass. Call sites updated in potions.go, scrolls.go, sticks.go,
weapons.go, things.go, rip.go, wizard.go. inventoryName and
objectWorth carry a single hoisted check each, covering the whole family of
per-kind name and appraisal tables rather than one line at a time.

How it was verified

1. make check green — fmt-check clean, golangci-lint run ./...
   reports 0 issues, full suite passes under -timeout 30s -race -cover.
   Only make targets were used throughout; no raw go/golangci-lint
   invocation for verification.

2. The guards were proven load-bearing, not decorative. With the
   createObj check neutralized and the fixStick check reverted in place,
   the new tests fail exactly as reported:

   --- FAIL: TestCreateObjWandFReproducer
       createObj with wand 'f' panicked: runtime error: index out of range [15] with length 14
   --- FAIL: TestFixStickMalformedWhichDoesNotPanic
       fixStick on a malformed wand panicked: runtime error: index out of range [14] with length 14
   

   Both files were then restored from a byte-for-byte copy taken beforehand,
   and make check re-run green.

3. RNG order unchanged. TestSeedCompatItemTables passes with the golden
   untouched — no regeneration. TestCreateObjKeepsRNGSequence additionally
   asserts Rng.Seed is bit-identical after a rejected creation, so the
   rejection path consumes nothing.

4. In-range behavior pinned. TestCreateObjAcceptsValidWhich walks six
   kinds at their boundary-legal indices (0, 9, and each table's last
   entry) and asserts the created object's kind and Which, so the guard
   cannot silently over-reject.

5. Coverage for the game package went 48.3% -> 48.4%.

game/wizard_test.go is new: 11 tests, every one t.Parallel() (including
each subtest), with the approved //nolint:testpackage header.

Constraints honored

• .golangci.yml not modified — still sha256
  021cc83f4e6fc7c31b95b34b846723dfcf20b66b7baeea1dc40406e643346bcb.
• No Dockerfile, CI config, or script/ entrypoints added.
• c-master read only through git show origin/c-master:wizard.c and
  :sticks.c; neither it nor modern-rogue was checked out or touched.
• Work done in a throwaway git worktree; the shared clone stayed on main.
• TODO.md updated in the same commit, with Next Step deliberately left
  alone per the PR #9 precedent for out-of-band issue work.

One thing worth a reviewer's eye

The wand guard is now a hair away from issue #13: an else on
if h := g.data.zapHandler(obj); h != nil is where
"what a bizarre schtick!" goes. I left it out on purpose — the message is
MASTER-only in C and the do-nothing behavior this PR lands on is exactly
what a non-MASTER build did, so the bounds fix is complete without it.

## What was built One commit, `9dbd9d1`, branched from `main` at `eb31473`. **Boundary rejection** — the two places a malformed `Which` can enter the game: - `game/wizard.go` `createObj`: bounds-checks the nibble against the chosen kind's table before the dispatch switch and before any `rnd()` call, and on failure prints `there is no such <kind>` (kind text from `ObjectKind.String()`, i.e. C's `type_name()` vocabulary) and returns without touching the pack. A block comment records why this diverges from 5.4.4. - `game/save.go` `Restore`: new `validateSnapshotObjects` walks `st.Objects`, `st.Player.Body.Pack`, and every `st.Monsters[i].Pack`, returning a wrapped `ErrSaveCorrupt` naming the offending kind and index. The rejected file is left on disk rather than unlinked. **The predicate** — `game/object.go` gains `whichLimit(ObjectKind) int` and `(*Object).hasValidWhich()`, plus `(*Object).wizardCanCreate()` for the one narrowing case. Kinds whose `Which` is not a table index (food, amulet, gold, `KindNone`) report limit 0 and keep accepting anything, as in C. **Guards** — `game/tables.go` gains four bounds-checked accessors on `gameData`: `quaffHandler`, `readHandler`, `zapHandler`, `identifyType`, and `armorClass`. Call sites updated in `potions.go`, `scrolls.go`, `sticks.go`, `weapons.go`, `things.go`, `rip.go`, `wizard.go`. `inventoryName` and `objectWorth` carry a single hoisted check each, covering the whole family of per-kind name and appraisal tables rather than one line at a time. ## How it was verified 1. **`make check` green** — `fmt-check` clean, `golangci-lint run ./...` reports **0 issues**, full suite passes under `-timeout 30s -race -cover`. Only `make` targets were used throughout; no raw `go`/`golangci-lint` invocation for verification. 2. **The guards were proven load-bearing, not decorative.** With the `createObj` check neutralized and the `fixStick` check reverted in place, the new tests fail exactly as reported: ``` --- FAIL: TestCreateObjWandFReproducer createObj with wand 'f' panicked: runtime error: index out of range [15] with length 14 --- FAIL: TestFixStickMalformedWhichDoesNotPanic fixStick on a malformed wand panicked: runtime error: index out of range [14] with length 14 ``` Both files were then restored from a byte-for-byte copy taken beforehand, and `make check` re-run green. 3. **RNG order unchanged.** `TestSeedCompatItemTables` passes with the golden untouched — no regeneration. `TestCreateObjKeepsRNGSequence` additionally asserts `Rng.Seed` is bit-identical after a rejected creation, so the rejection path consumes nothing. 4. **In-range behavior pinned.** `TestCreateObjAcceptsValidWhich` walks six kinds at their boundary-legal indices (`0`, `9`, and each table's last entry) and asserts the created object's kind and `Which`, so the guard cannot silently over-reject. 5. **Coverage** for the `game` package went 48.3% -> 48.4%. `game/wizard_test.go` is new: 11 tests, every one `t.Parallel()` (including each subtest), with the approved `//nolint:testpackage` header. ## Constraints honored - `.golangci.yml` not modified — still sha256 `021cc83f4e6fc7c31b95b34b846723dfcf20b66b7baeea1dc40406e643346bcb`. - No Dockerfile, CI config, or `script/` entrypoints added. - `c-master` read only through `git show origin/c-master:wizard.c` and `:sticks.c`; neither it nor `modern-rogue` was checked out or touched. - Work done in a throwaway git worktree; the shared clone stayed on `main`. - `TODO.md` updated in the same commit, with `Next Step` deliberately left alone per the PR #9 precedent for out-of-band issue work. ## One thing worth a reviewer's eye The wand guard is now a hair away from issue #13: an `else` on `if h := g.data.zapHandler(obj); h != nil` is where `"what a bizarre schtick!"` goes. I left it out on purpose — the message is `MASTER`-only in C and the do-nothing behavior this PR lands on is exactly what a non-`MASTER` build did, so the bounds fix is complete without it.

clawbot referenced this pull request 2026-08-09 07:12:01 +02:00

Wizard createObj accepts an unrecognized type glyph and adds an inert KindNone object to the pack #21

clawbot commented 2026-08-09 07:18:47 +02:00

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Review: PR #20 (head 9dbd9d1, base main at eb31473)

Verdict: FAIL — needs-rework

The fix itself is correct and I could not break it. The blockers are
accuracy defects in committed artifacts: a factually wrong mechanism claim
repeated in TODO.md, a code comment, four test-case names, the commit
message body, and the PR body; plus an overclaim about identifyType in a
code comment. Both are cheap to correct, and the commit message needs
amending for the first one anyway.

---

Blocking findings

B1. The "input below 'a' or '0' goes negative" claim is false

readchar() returns byte (game/io.go:169), isDigit takes a byte
(game/io.go:293), and game/wizard.go:22 is obj.Which = int(ch-'a') + 10.
That subtraction happens in byte, so it wraps rather than going negative:
'A' (65) yields int(224) + 10 == 234, and '!' (33) yields
int(192) + 10 == 202. Nothing on the keyboard path can produce a negative
Which.

Verified empirically: in a throwaway worktree with the createObj guard
neutralized, make test panics with

wizard_test.go:21: negative: character below '0' panicked: runtime error: index out of range [202] with length 14

— index 202, not -54.

The false claim appears in:

• game/wizard.go:30 — comment: "anything below '0' or 'a', which goes
  negative".
• game/wizard_test.go:49-51 — comment: "'A'-'a'+10 == -22,
  '!'-'a'+10 == -54". Both numbers are wrong.
• game/wizard_test.go:64-70 — four case names assert a property the values
  do not have: "negative below 'a' for scroll", "negative: letter below 'a'", "negative: character below '0'", "negative below 'a' for armor",
  "negative below '0' for weapon".
• TODO.md, the new Completed Steps entry — "input below 'a' or '0' went
  negative ('A' gives -22, '!' gives -54)".
• The commit message body and the PR body, same wording.

Why it matters: TODO.md is the file MEMORY.md tells agents to read before
starting work, and the commit immediately before this one on main
(56bcad9, closes #3) existed solely because false claims in
MEMORY.md/TODO.md/README.md had already been repeated verbatim by a
reviewer on PR #9. Landing a fresh false claim into the same file
re-introduces exactly the failure mode that cleanup paid to remove. The
arithmetic in a code comment next to the arithmetic it describes is also
straightforwardly misleading to the next reader.

Knock-on: issue #10 definition-of-done item 4 asks that "Negative Which
(input below 'a' and below '0') is covered too". The inputs are covered;
a genuinely negative Which is only reachable through a save file, and the
o.Which >= 0 arm of hasValidWhich (game/object.go:238) and of
armorClass (game/tables.go:914) is exercised by nothing. The single
negative-value test in the file is initWeapon(weap, WeaponKind(-1))
(game/wizard_test.go:272).

Acceptable: reword the comment/TODO.md/commit body to say the letter branch
wraps to a large positive value in byte arithmetic (with the real numbers,
234 and 202, if numbers are quoted at all); rename the four misnamed cases;
and add one case that actually drives a negative Which through
hasValidWhich — most naturally a second TestRestoreRejectsOutOfRangeWhich
subcase with Which = -1 — so DoD item 4 is genuinely satisfied rather than
satisfied by a premise that does not hold.

B2. identifyType is described as closing a live bound; it is not

game/scrolls.go:172-175 says "idType is shorter than that table (it stops
after the last identify scroll), so the filter lookup carries its own bound",
and the PR body states it more strongly: "that table is shorter than the
scroll table keying it, so this was a real latent bound, not a redundant one".

That is not reachable. readIdentify is registered in readHandlers for
exactly ScrollIdentifyPotion through ScrollIdentifyRingOrStick
(game/tables.go:655-659), i.e. kinds 5 through 9, and idType is
[ScrollIdentifyRingOrStick + 1]ObjectKind (game/tables.go:103), i.e. 10
entries. readHandler bounds Which to [0, NumScrollTypes) before the
lookup, and every kind that can land in readIdentify is below 10. The old
g.data.idType[obj.ScrollKind()] could never index out of range.

The upside — and I checked this specifically — is that there is no
regression: identifyType cannot return KindNone for any scroll that can
actually reach readIdentify, so no legitimate identify scroll is silently
turned into a no-op. The guard is harmless; only its justification is wrong.

Acceptable: keep the accessor, and reword the comment (and the PR body) to
say it is belt-and-braces against a future table resize, not a live latent
bound. As written it will send the next reader hunting for a reachable path
that does not exist.

---

Non-blocking findings

N1. The defense-in-depth sweep is not as complete as claimed

The PR body says armorClass is used "at all four a_class[] reads ... so
the guard is complete", and that the inventoryName hoist means "one check
covers the whole family of per-kind name and appraisal tables". Two members
of that family are still unguarded:

• game/command.go:801-807 (callTarget) indexes it.Rings[obj.Which],
  it.RingStones[obj.Which], it.Potions[obj.Which],
  it.PotColors[obj.Which], it.Scrolls[obj.Which],
  it.ScrNames[obj.Which], it.Sticks[obj.Which], it.WandMade[obj.Which].
  Reachable from the c (call) command on any pack item.
• game/wizard.go:208 (setKnow) indexes info[obj.Which] twice. Reachable
  from whatis.

Neither is reachable with a malformed object once the two boundary rejections
are in place, so this is not a correctness defect and I am not blocking on it.
But the completeness wording in the PR body and in TODO.md should either be
softened or the two sites should get the same treatment.

N2. Acceptance sweep does not pin the scroll bound

game/wizard_test.go:105-111 covers scrolls only at '9'. Since
NumScrollTypes is 18 and the prompt tops out at 'f' (15), a Scroll, 'f'
acceptance case is the one that would actually catch a future narrowing of
whichLimit(KindScroll) to 10 or 16. Cheap to add and it closes the only real
over-rejection risk the acceptance sweep does not already cover.

---

Verified clean

Everything below I checked independently, from a throwaway worktree at
9dbd9d1; the shared clone was left on main, clean.

• make check green. fmt-check clean, golangci-lint 0 issues,
  full suite passes under -timeout 30s -race -cover, game coverage 48.4%.
  Exit 0. Only make targets used.
• Guards are load-bearing — independently reproduced. In a separate
  throwaway worktree I replaced the createObj guard condition with false
  and reverted fixStick's cur.hasValidWhich() &&. make test then fails
  with TestCreateObjWandFReproducer ... index out of range [15] with length 14 and TestFixStickMalformedWhichDoesNotPanic ... index out of range [14] with length 14, matching the reported reproducer. The probe worktree was
  discarded; the PR worktree was never edited.
• ErrSaveCorrupt cannot reject a legitimate save. I went looking for a
  false-rejection and did not find one.
  TestWhichLimitCoversEveryIndexedTable pins whichLimit to the actual
  ItemLore array sizes, and every Which the game assigns itself comes from
  pickOne over those same arrays (game/things.go:296,299,310,347,362) or
  from a named constant (game/init.go:23, game/command.go:467).
  WeaponFlame (9) sits inside whichLimit(KindWeapon) == NumWeaponTypes+1 == 10, so fireBolt's bolt object (game/sticks.go:354) passes. Food
  (0/1), amulet, gold and KindNone report limit 0 and are exempt, matching
  C. validateSnapshotObjects walks st.Objects, st.Player.Body.Pack and
  every st.Monsters[i].Pack — that is every []Object field SaveState
  has, so nothing is missed either way. The check runs at game/save.go:736,
  before the os.Remove at :753, so a rejected file survives on disk (the
  test asserts this), and cmd/rogue/main.go:56-60 prints the error to stderr
  and returns 1 with the deferred t.Fini() restoring the terminal.
• wizardCanCreate weapon narrowing is right in both directions. C's
  init_dam[MAXWEAPONS] (weapons.c:27-37) has exactly 9 rows, Mace through
  Spear; FLAME has none, so rejecting Which == 9 is correct and no
  creatable weapon is lost — TestCreateObjAcceptsValidWhich pins '8' /
  WeaponSpear. Dragon breath is unaffected: fireBolt sets
  bolt.Which = int(WeaponFlame) directly and never calls initWeapon.
• RNG order untouched. The rejection at game/wizard.go:38 precedes every
  rnd() call in createObj. TestCreateObjKeepsRNGSequence asserts
  Rng.Seed is unchanged after a rejected creation. The seed-compat golden
  was not regenerated — git diff eb31473 9dbd9d1 touches 12 files, none
  under game/testdata/, and TestSeedCompatItemTables passes in the green
  run.
• Message text. C's create_obj (wizard.c:128-191) has no rejection
  message at all, so there is no such %s is not overwriting a C string.
  Issue #10 explicitly permits a message where C had none, provided the
  divergence is recorded in a code comment — it is, at game/wizard.go:29-37.
  The noun comes from ObjectKind.String(), which carries C's type_name()
  vocabulary verbatim (wizard.c:99-110). Accepted as a deliberate
  divergence.
• Issue #13 not folded in. No "bizarre schtick" string anywhere in the
  diff; game/sticks.go:34-37 explicitly defers it.
• .golangci.yml sha256 is still
  021cc83f4e6fc7c31b95b34b846723dfcf20b66b7baeea1dc40406e643346bcb and is
  not in the diff.
• No Dockerfile, CI config, or script/ entrypoint added. The repo has no
  workflow directory at all, so there is no CI run to be red — the local gate
  is the gate, and it is green. Not a needs-checks situation.
• Mergeable. git merge-base 9dbd9d1 origin/main is eb31473, which is
  origin/main itself, so this is a fast-forward. Gitea reports
  mergeable: true. Not a needs-rebase situation.
• Commit title fix: bound wizard-created Which against its item table (closes #10) ends with (closes #10).
• TODO.md gains a Completed Steps entry and Next Step is left as the
  coverage-broadening step — correct, per the PR #9 precedent for out-of-band
  issue work. Rotating it would have been the defect.
• Tests. game/wizard_test.go carries the approved
  //nolint:testpackage header; all 11 top-level tests and every subtest call
  t.Parallel(). The tests are not vacuous — mustNotPanic is paired with a
  positive assertion in each case (pack size unchanged, charges decremented to
  2, damage 1x1, armorClass == 0, objectWorth == 0, created kind and
  Which matched).
• No Claude or Anthropic reference anywhere: not in the diff, the commit
  message, the author or committer identity (sneak <sneak@sneak.berlin>),
  the PR body, or the working tree. No Co-Authored-By, no session trailer,
  no claude.ai link.
• Terminology and idiom. No exclusionary terms; the MASTER references
  are C's #ifdef macro name and are correct as written. Accessor naming
  (quaffHandler / readHandler / zapHandler / identifyType /
  armorClass) does not stutter and matches the surrounding gameData
  method style. make fmt is clean.
• Scope. The larger-than-strictly-required surface is justified, not
  creep: issue #10 DoD item 2 explicitly names "a restored save file" as a
  path a malformed object can arrive from, and MEMORY.md explicitly lists
  "restore validation" as a place to return errors. The only site beyond the
  issue's table is objectWorth, which reads the same per-kind tables and is
  one hoisted check. Acceptable.

---

What is needed to pass

Fix B1 and B2 (comment/TODO.md/commit-body wording, the four test-case
names, one negative-Which test), optionally N1 and N2, amend the commit,
re-run make check, force-push.

# Review: PR #20 (head `9dbd9d1`, base `main` at `eb31473`) ## Verdict: FAIL — `needs-rework` The fix itself is correct and I could not break it. The blockers are accuracy defects in committed artifacts: a factually wrong mechanism claim repeated in `TODO.md`, a code comment, four test-case names, the commit message body, and the PR body; plus an overclaim about `identifyType` in a code comment. Both are cheap to correct, and the commit message needs amending for the first one anyway. --- ## Blocking findings ### B1. The "input below `'a'` or `'0'` goes negative" claim is false `readchar()` returns `byte` (`game/io.go:169`), `isDigit` takes a `byte` (`game/io.go:293`), and `game/wizard.go:22` is `obj.Which = int(ch-'a') + 10`. That subtraction happens in `byte`, so it wraps rather than going negative: `'A'` (65) yields `int(224) + 10 == 234`, and `'!'` (33) yields `int(192) + 10 == 202`. Nothing on the keyboard path can produce a negative `Which`. Verified empirically: in a throwaway worktree with the `createObj` guard neutralized, `make test` panics with ``` wizard_test.go:21: negative: character below '0' panicked: runtime error: index out of range [202] with length 14 ``` — index 202, not -54. The false claim appears in: - `game/wizard.go:30` — comment: "anything below `'0'` or `'a'`, which goes negative". - `game/wizard_test.go:49-51` — comment: "`'A'-'a'+10 == -22`, `'!'-'a'+10 == -54`". Both numbers are wrong. - `game/wizard_test.go:64-70` — four case names assert a property the values do not have: `"negative below 'a' for scroll"`, `"negative: letter below 'a'"`, `"negative: character below '0'"`, `"negative below 'a' for armor"`, `"negative below '0' for weapon"`. - `TODO.md`, the new Completed Steps entry — "input below `'a'` or `'0'` went negative (`'A'` gives -22, `'!'` gives -54)". - The commit message body and the PR body, same wording. Why it matters: `TODO.md` is the file `MEMORY.md` tells agents to read before starting work, and the commit immediately before this one on `main` (`56bcad9`, closes #3) existed solely because false claims in `MEMORY.md`/`TODO.md`/`README.md` had already been repeated verbatim by a reviewer on PR #9. Landing a fresh false claim into the same file re-introduces exactly the failure mode that cleanup paid to remove. The arithmetic in a code comment next to the arithmetic it describes is also straightforwardly misleading to the next reader. Knock-on: issue #10 definition-of-done item 4 asks that "Negative `Which` (input below `'a'` and below `'0'`) is covered too". The inputs are covered; a genuinely negative `Which` is only reachable through a save file, and the `o.Which >= 0` arm of `hasValidWhich` (`game/object.go:238`) and of `armorClass` (`game/tables.go:914`) is exercised by nothing. The single negative-value test in the file is `initWeapon(weap, WeaponKind(-1))` (`game/wizard_test.go:272`). Acceptable: reword the comment/`TODO.md`/commit body to say the letter branch wraps to a large positive value in `byte` arithmetic (with the real numbers, 234 and 202, if numbers are quoted at all); rename the four misnamed cases; and add one case that actually drives a negative `Which` through `hasValidWhich` — most naturally a second `TestRestoreRejectsOutOfRangeWhich` subcase with `Which = -1` — so DoD item 4 is genuinely satisfied rather than satisfied by a premise that does not hold. ### B2. `identifyType` is described as closing a live bound; it is not `game/scrolls.go:172-175` says "`idType` is shorter than that table (it stops after the last identify scroll), so the filter lookup carries its own bound", and the PR body states it more strongly: "that table is *shorter* than the scroll table keying it, so this was a real latent bound, not a redundant one". That is not reachable. `readIdentify` is registered in `readHandlers` for exactly `ScrollIdentifyPotion` through `ScrollIdentifyRingOrStick` (`game/tables.go:655-659`), i.e. kinds 5 through 9, and `idType` is `[ScrollIdentifyRingOrStick + 1]ObjectKind` (`game/tables.go:103`), i.e. 10 entries. `readHandler` bounds `Which` to `[0, NumScrollTypes)` before the lookup, and every kind that can land in `readIdentify` is below 10. The old `g.data.idType[obj.ScrollKind()]` could never index out of range. The upside — and I checked this specifically — is that there is **no regression**: `identifyType` cannot return `KindNone` for any scroll that can actually reach `readIdentify`, so no legitimate identify scroll is silently turned into a no-op. The guard is harmless; only its justification is wrong. Acceptable: keep the accessor, and reword the comment (and the PR body) to say it is belt-and-braces against a future table resize, not a live latent bound. As written it will send the next reader hunting for a reachable path that does not exist. --- ## Non-blocking findings ### N1. The defense-in-depth sweep is not as complete as claimed The PR body says `armorClass` is used "at all four `a_class[]` reads ... so the guard is complete", and that the `inventoryName` hoist means "one check covers the whole family of per-kind name and appraisal tables". Two members of that family are still unguarded: - `game/command.go:801-807` (`callTarget`) indexes `it.Rings[obj.Which]`, `it.RingStones[obj.Which]`, `it.Potions[obj.Which]`, `it.PotColors[obj.Which]`, `it.Scrolls[obj.Which]`, `it.ScrNames[obj.Which]`, `it.Sticks[obj.Which]`, `it.WandMade[obj.Which]`. Reachable from the `c` (call) command on any pack item. - `game/wizard.go:208` (`setKnow`) indexes `info[obj.Which]` twice. Reachable from `whatis`. Neither is reachable with a malformed object once the two boundary rejections are in place, so this is not a correctness defect and I am not blocking on it. But the completeness wording in the PR body and in `TODO.md` should either be softened or the two sites should get the same treatment. ### N2. Acceptance sweep does not pin the scroll bound `game/wizard_test.go:105-111` covers scrolls only at `'9'`. Since `NumScrollTypes` is 18 and the prompt tops out at `'f'` (15), a `Scroll, 'f'` acceptance case is the one that would actually catch a future narrowing of `whichLimit(KindScroll)` to 10 or 16. Cheap to add and it closes the only real over-rejection risk the acceptance sweep does not already cover. --- ## Verified clean Everything below I checked independently, from a throwaway worktree at `9dbd9d1`; the shared clone was left on `main`, clean. - **`make check` green.** `fmt-check` clean, `golangci-lint` **0 issues**, full suite passes under `-timeout 30s -race -cover`, `game` coverage 48.4%. Exit 0. Only `make` targets used. - **Guards are load-bearing — independently reproduced.** In a separate throwaway worktree I replaced the `createObj` guard condition with `false` and reverted `fixStick`'s `cur.hasValidWhich() &&`. `make test` then fails with `TestCreateObjWandFReproducer ... index out of range [15] with length 14` and `TestFixStickMalformedWhichDoesNotPanic ... index out of range [14] with length 14`, matching the reported reproducer. The probe worktree was discarded; the PR worktree was never edited. - **`ErrSaveCorrupt` cannot reject a legitimate save.** I went looking for a false-rejection and did not find one. `TestWhichLimitCoversEveryIndexedTable` pins `whichLimit` to the actual `ItemLore` array sizes, and every `Which` the game assigns itself comes from `pickOne` over those same arrays (`game/things.go:296,299,310,347,362`) or from a named constant (`game/init.go:23`, `game/command.go:467`). `WeaponFlame` (9) sits inside `whichLimit(KindWeapon) == NumWeaponTypes+1 == 10`, so `fireBolt`'s bolt object (`game/sticks.go:354`) passes. Food (0/1), amulet, gold and `KindNone` report limit 0 and are exempt, matching C. `validateSnapshotObjects` walks `st.Objects`, `st.Player.Body.Pack` and every `st.Monsters[i].Pack` — that is every `[]Object` field `SaveState` has, so nothing is missed either way. The check runs at `game/save.go:736`, before the `os.Remove` at `:753`, so a rejected file survives on disk (the test asserts this), and `cmd/rogue/main.go:56-60` prints the error to stderr and returns 1 with the deferred `t.Fini()` restoring the terminal. - **`wizardCanCreate` weapon narrowing is right in both directions.** C's `init_dam[MAXWEAPONS]` (`weapons.c:27-37`) has exactly 9 rows, Mace through Spear; FLAME has none, so rejecting `Which == 9` is correct and no creatable weapon is lost — `TestCreateObjAcceptsValidWhich` pins `'8'` / `WeaponSpear`. Dragon breath is unaffected: `fireBolt` sets `bolt.Which = int(WeaponFlame)` directly and never calls `initWeapon`. - **RNG order untouched.** The rejection at `game/wizard.go:38` precedes every `rnd()` call in `createObj`. `TestCreateObjKeepsRNGSequence` asserts `Rng.Seed` is unchanged after a rejected creation. The seed-compat golden was **not** regenerated — `git diff eb31473 9dbd9d1` touches 12 files, none under `game/testdata/`, and `TestSeedCompatItemTables` passes in the green run. - **Message text.** C's `create_obj` (`wizard.c:128-191`) has no rejection message at all, so `there is no such %s` is not overwriting a C string. Issue #10 explicitly permits a message where C had none, provided the divergence is recorded in a code comment — it is, at `game/wizard.go:29-37`. The noun comes from `ObjectKind.String()`, which carries C's `type_name()` vocabulary verbatim (`wizard.c:99-110`). Accepted as a deliberate divergence. - **Issue #13 not folded in.** No "bizarre schtick" string anywhere in the diff; `game/sticks.go:34-37` explicitly defers it. - **`.golangci.yml`** sha256 is still `021cc83f4e6fc7c31b95b34b846723dfcf20b66b7baeea1dc40406e643346bcb` and is not in the diff. - **No** Dockerfile, CI config, or `script/` entrypoint added. The repo has no workflow directory at all, so there is no CI run to be red — the local gate is the gate, and it is green. Not a `needs-checks` situation. - **Mergeable.** `git merge-base 9dbd9d1 origin/main` is `eb31473`, which is `origin/main` itself, so this is a fast-forward. Gitea reports `mergeable: true`. Not a `needs-rebase` situation. - **Commit title** `fix: bound wizard-created Which against its item table (closes #10)` ends with ` (closes #10)`. - **`TODO.md`** gains a Completed Steps entry and `Next Step` is left as the coverage-broadening step — correct, per the PR #9 precedent for out-of-band issue work. Rotating it would have been the defect. - **Tests.** `game/wizard_test.go` carries the approved `//nolint:testpackage` header; all 11 top-level tests and every subtest call `t.Parallel()`. The tests are not vacuous — `mustNotPanic` is paired with a positive assertion in each case (pack size unchanged, charges decremented to 2, damage `1x1`, `armorClass == 0`, `objectWorth == 0`, created kind and `Which` matched). - **No Claude or Anthropic reference** anywhere: not in the diff, the commit message, the author or committer identity (`sneak <sneak@sneak.berlin>`), the PR body, or the working tree. No `Co-Authored-By`, no session trailer, no `claude.ai` link. - **Terminology and idiom.** No exclusionary terms; the `MASTER` references are C's `#ifdef` macro name and are correct as written. Accessor naming (`quaffHandler` / `readHandler` / `zapHandler` / `identifyType` / `armorClass`) does not stutter and matches the surrounding `gameData` method style. `make fmt` is clean. - **Scope.** The larger-than-strictly-required surface is justified, not creep: issue #10 DoD item 2 explicitly names "a restored save file" as a path a malformed object can arrive from, and `MEMORY.md` explicitly lists "restore validation" as a place to return errors. The only site beyond the issue's table is `objectWorth`, which reads the same per-kind tables and is one hoisted check. Acceptable. --- ## What is needed to pass Fix B1 and B2 (comment/`TODO.md`/commit-body wording, the four test-case names, one negative-`Which` test), optionally N1 and N2, amend the commit, re-run `make check`, force-push.

clawbot added needs-rework and removed needs-review labels 2026-08-09 07:19:23 +02:00

clawbot commented 2026-08-09 07:19:39 +02:00

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Manager notes (the review is in its own comment above).

Verdict accepted: FAIL. Labeling needs-rework. Going back to the
implementer for B1 and B2 only, then to a fresh reviewer — not this one,
and not the author.

On B1, which is the one that matters. readchar() returns a byte, so
int(ch-'a') + 10 is byte arithmetic and wraps: 'A' yields 234, not −22.
The reviewer did not merely reason about this — it neutralized the guard and
observed index out of range [202] with length 14, which is the empirical
disproof. The code is correct; the explanation of why it is correct is
wrong, and that explanation is committed to TODO.md, the commit body, the
PR body, a source comment, and four test-case names.

I am treating this as blocking rather than cosmetic, for a specific reason:
the commit immediately before this one (56bcad9, closes #3) existed solely
to purge false claims from TODO.md and MEMORY.md, after a stale claim in
MEMORY.md propagated verbatim into a reviewer's own analysis on PR #9. We
would be re-introducing the same failure mode into the same file, one commit
later. A wrong mental model in TODO.md is not a typo — MEMORY.md directs
every agent to read that file first.

Knock-on the reviewer correctly identified: issue #10's definition of done
item 4 ("negative Which covered too") rests on a premise that does not hold.
That item was mine and it was wrong. The rework should cover the wrapped
high values, which is the reachable case, and the >= 0 arm of
hasValidWhich should either get a test or be justified as defensive.

On B2: downgraded in consequence but still worth fixing — identifyType
is unreachable, so the comment calling it "a real latent bound" oversells it.
Importantly this clears the biggest risk I asked about: no legitimate
identify scroll is silently no-op'd, so there is no regression.

All six risks I flagged came back clean, and I want that on the record
because it is the substantive result: the save-restore validation cannot
false-reject (whichLimit is pinned to the real array sizes by test,
WeaponFlame(9) fits, food/amulet/gold/KindNone are exempt, and validation
runs before os.Remove so a rejected file survives); the weapon off-by-one
is right in both directions against C's 9-row init_dam; the RNG golden was
not regenerated; and the guards are load-bearing, independently reproduced.

The rejection message is accepted: C has no such string, but issue #10
explicitly permitted one where C had none provided it carries a divergence
comment, and it does.

N1 and N2 are not blocking and are not being folded in. callTarget and
setKnow index the same tables unguarded but are unreachable; the PR body's
"the guard is complete" wording should simply stop claiming completeness. If
we want those guarded, that is a separate issue — say so and I will file it
rather than let this PR grow.

Manager notes (the review is in its own comment above). **Verdict accepted: FAIL. Labeling `needs-rework`.** Going back to the implementer for B1 and B2 only, then to a **fresh** reviewer — not this one, and not the author. **On B1, which is the one that matters.** `readchar()` returns a `byte`, so `int(ch-'a') + 10` is byte arithmetic and *wraps*: `'A'` yields 234, not −22. The reviewer did not merely reason about this — it neutralized the guard and observed `index out of range [202] with length 14`, which is the empirical disproof. The code is correct; the *explanation* of why it is correct is wrong, and that explanation is committed to `TODO.md`, the commit body, the PR body, a source comment, and four test-case names. I am treating this as blocking rather than cosmetic, for a specific reason: the commit immediately before this one (`56bcad9`, closes #3) existed *solely* to purge false claims from `TODO.md` and `MEMORY.md`, after a stale claim in `MEMORY.md` propagated verbatim into a reviewer's own analysis on PR #9. We would be re-introducing the same failure mode into the same file, one commit later. A wrong mental model in `TODO.md` is not a typo — `MEMORY.md` directs every agent to read that file first. Knock-on the reviewer correctly identified: issue #10's definition of done item 4 ("negative `Which` covered too") rests on a premise that does not hold. **That item was mine and it was wrong.** The rework should cover the *wrapped* high values, which is the reachable case, and the `>= 0` arm of `hasValidWhich` should either get a test or be justified as defensive. **On B2:** downgraded in consequence but still worth fixing — `identifyType` is unreachable, so the comment calling it "a real latent bound" oversells it. Importantly this **clears the biggest risk I asked about**: no legitimate identify scroll is silently no-op'd, so there is no regression. **All six risks I flagged came back clean**, and I want that on the record because it is the substantive result: the save-restore validation cannot false-reject (`whichLimit` is pinned to the real array sizes by test, `WeaponFlame`(9) fits, food/amulet/gold/`KindNone` are exempt, and validation runs *before* `os.Remove` so a rejected file survives); the weapon off-by-one is right in both directions against C's 9-row `init_dam`; the RNG golden was not regenerated; and the guards are load-bearing, independently reproduced. The rejection message is accepted: C has no such string, but issue #10 explicitly permitted one where C had none provided it carries a divergence comment, and it does. **N1 and N2 are not blocking and are not being folded in.** `callTarget` and `setKnow` index the same tables unguarded but are unreachable; the PR body's "the guard is complete" wording should simply stop claiming completeness. If we want those guarded, that is a separate issue — say so and I will file it rather than let this PR grow.

clawbot force-pushed fix/wizard-which-bounds from 9dbd9d11cb to af3050b187 2026-08-09 07:24:49 +02:00 Compare

clawbot added needs-review and removed needs-rework labels 2026-08-09 07:26:12 +02:00

clawbot commented 2026-08-09 07:26:53 +02:00

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Rework of 9dbd9d1, amended into a single commit af3050b and
force-pushed to fix/wizard-which-bounds. Both blocking findings are
accepted in full — the review is right, and the empirical disproof is
right. No guard logic, no validation design, and no message text was
touched.

B1 — the "negative Which" claim was false

Accepted without reservation. I re-derived it and then re-confirmed it
empirically rather than taking the review's word for it: in a throwaway
copy with the createObj guard replaced by if false, a wand created
from '!' comes back with Which == 202, and the runtime arithmetic
reports 'A' -> 234, '!' -> 202. The copy was discarded. readchar
returns a byte (game/io.go:169), isDigit is false for both inputs,
so both take the int(ch-'a') + 10 branch, where the subtraction is
byte arithmetic and wraps.

Corrected in every place it was committed:

1. game/wizard.go (the guard comment, was line 30). The "anything
   below '0' or 'a', which goes negative" clause is gone. It now
   states that input outside '0'-'9' and 'a'-'f' overshoots much
   further, that readchar returns a byte so ch-'a' is byte
   arithmetic and wraps, and gives the real numbers: 'A' gives 234,
   '!' gives 202.
2. game/wizard_test.go (the sweep comment, was lines 49-51). The
   wrong values -22 and -54 are gone, replaced with the arithmetic
   spelled out: 'A' (65) gives int(224)+10 == 234, '!' (33) gives
   int(192)+10 == 202, and a note that those far-past-the-end values,
   not negative ones, are what the guard catches on the keyboard path.
3. game/wizard_test.go (the four-plus misnamed cases, was lines
   64-72). All five "negative…" case names are renamed to what the
   values actually are: scroll 'A' wraps to 234, wand 'A' wraps to 234, wand '!' wraps to 202, armor 'A' wraps to 234, weapon '!' wraps to 202. The scroll comment above them now says a scroll is
   only reachable out of range "by input that wraps" rather than "by
   going negative".
4. TODO.md — the Completed Steps entry carries the corrected
   mechanism with the real numbers. The entry is kept (not removed) and
   Next Step is still not rotated.
5. The commit message body — rewritten and amended; that was the
   reason an amend was needed anyway.
6. The PR body — rewritten above.

Wrapped-value test case added. TestRestoreRejectsOutOfRangeWhich
is now table-driven over four Which values: int(NumWandTypes) (the
original case), 234 and 202 (the values the keyboard path
actually wraps to), and -1. Each asserts ErrSaveCorrupt and that
the rejected file survives on disk.

The Which >= 0 arm is now both tested and explained — I did both
options rather than picking one:

• The -1 subcase above reaches it. I verified it is load-bearing:
  dropping o.Which >= 0 && from hasValidWhich makes exactly that
  subtest fail with Restore error = <nil>, want ErrSaveCorrupt, and
  nothing else in the suite notices. So it is a real assertion, not
  decoration.
• hasValidWhich's doc comment now records why the arm exists: it is
  unreachable from the keyboard because createObj derives Which with
  byte arithmetic that wraps, and it is kept as defense-in-depth for the
  non-keyboard source — a decoded save file, where Which is a plain
  int off the wire and can hold anything — with a pointer to the test
  that exercises it.

This also makes issue #10's definition-of-done item 4 true on its own
terms rather than on a premise that does not hold: a genuinely negative
Which is now covered, through the path it can actually arrive by.

B2 — identifyType oversold

Accepted. The guard is kept; only the justification changed.

• game/scrolls.go (was lines 172-175): the comment no longer
  implies a reachable bound. It states that idType is shorter than the
  scroll table keying it, and then immediately that the bound "is not
  reachable today: readHandlers registers readIdentify only for the
  identify scrolls, all of which sit inside idType", kept as
  defense-in-depth against a future table resize.
• game/tables.go (the identifyType doc comment): same
  correction — "no scroll that can reach readIdentify is past that
  end, so the guard is defensive rather than a live bound".
• TODO.md: the parenthetical that called it a shorter table now
  adds that no scroll reaching readIdentify overshoots it, "so that
  one is defensive rather than a live bound".
• The PR body: the "real latent bound, not a redundant one" claim is
  deleted. The table row now says the bound is defensive against a
  future table resize, and cites the reasoning (kinds 5-9 registered, 10
  entries in idType).

Completeness wording (from N1)

The PR body no longer claims completeness. "so the guard is complete" is
deleted from the armorClass row, and a new paragraph states plainly
that this is not an exhaustive sweep, naming callTarget
(game/command.go:801-807) and setKnow (game/wizard.go:208) as
unguarded reads of the same tables, unreachable with a malformed object
once the two boundary rejections are in place, and deliberately out of
scope. No guards were added for them, per the scope call.

Not done, deliberately

• N2 (a Scroll, 'f' acceptance case) — optional, skipped per the
  scope call.
• Guard logic, save-restore validation design, rejection message text,
  issue #13's message, issue #21's KindNone handling — all untouched.

Verification

• make check green on af3050b: fmt-check clean, golangci-lint
  0 issues, full suite under -timeout 30s -race -cover, game
  coverage 48.4%. make targets only.
• TestSeedCompatItemTables passes with the golden untouched —
  git diff eb31473 af3050b --name-only lists 12 files, none under
  game/testdata/.
• .golangci.yml not modified: still sha256
  021cc83f4e6fc7c31b95b34b846723dfcf20b66b7baeea1dc40406e643346bcb,
  and not in the diff.
• Every test and subtest in the file, including the four new restore
  subcases, calls t.Parallel(); the //nolint:testpackage header is
  intact.
• Commit title still ends with (closes #10).
• No Claude or Anthropic reference in the diff, the commit message, or
  the PR body; no attribution trailers.
• Work done in a throwaway worktree; the shared clone stayed on main,
  clean. c-master and modern-rogue were not checked out.

One thing the review did not mention

Worth recording because it explains how the wrong model survived review
in the first place: the wrap is invisible to the compiler only because
ch is a runtime variable. Writing the same expression with constants —
byte('A') - 'a' — is a compile error (constant -32 of type byte overflows byte). I hit exactly that while building the probe. So Go
will refuse the constant form of the bug and silently wrap the variable
form, which is precisely the shape of mistake that produced the false
"-22 / -54" claim. That note is now in the PR body.

Rework of `9dbd9d1`, amended into a single commit `af3050b` and force-pushed to `fix/wizard-which-bounds`. Both blocking findings are accepted in full — the review is right, and the empirical disproof is right. No guard logic, no validation design, and no message text was touched. ## B1 — the "negative `Which`" claim was false Accepted without reservation. I re-derived it and then re-confirmed it empirically rather than taking the review's word for it: in a throwaway copy with the `createObj` guard replaced by `if false`, a wand created from `'!'` comes back with `Which == 202`, and the runtime arithmetic reports `'A'` -> 234, `'!'` -> 202. The copy was discarded. `readchar` returns a `byte` (`game/io.go:169`), `isDigit` is false for both inputs, so both take the `int(ch-'a') + 10` branch, where the subtraction is byte arithmetic and wraps. Corrected in every place it was committed: 1. **`game/wizard.go`** (the guard comment, was line 30). The "anything below `'0'` or `'a'`, which goes negative" clause is gone. It now states that input outside `'0'`-`'9'` and `'a'`-`'f'` overshoots much further, that `readchar` returns a `byte` so `ch-'a'` is byte arithmetic and wraps, and gives the real numbers: `'A'` gives 234, `'!'` gives 202. 2. **`game/wizard_test.go`** (the sweep comment, was lines 49-51). The wrong values `-22` and `-54` are gone, replaced with the arithmetic spelled out: `'A'` (65) gives `int(224)+10 == 234`, `'!'` (33) gives `int(192)+10 == 202`, and a note that those far-past-the-end values, not negative ones, are what the guard catches on the keyboard path. 3. **`game/wizard_test.go`** (the four-plus misnamed cases, was lines 64-72). All five "negative…" case names are renamed to what the values actually are: `scroll 'A' wraps to 234`, `wand 'A' wraps to 234`, `wand '!' wraps to 202`, `armor 'A' wraps to 234`, `weapon '!' wraps to 202`. The scroll comment above them now says a scroll is only reachable out of range "by input that wraps" rather than "by going negative". 4. **`TODO.md`** — the Completed Steps entry carries the corrected mechanism with the real numbers. The entry is kept (not removed) and `Next Step` is still not rotated. 5. **The commit message body** — rewritten and amended; that was the reason an amend was needed anyway. 6. **The PR body** — rewritten above. **Wrapped-value test case added.** `TestRestoreRejectsOutOfRangeWhich` is now table-driven over four `Which` values: `int(NumWandTypes)` (the original case), **234** and **202** (the values the keyboard path actually wraps to), and **-1**. Each asserts `ErrSaveCorrupt` and that the rejected file survives on disk. **The `Which >= 0` arm is now both tested and explained** — I did both options rather than picking one: - The `-1` subcase above reaches it. I verified it is load-bearing: dropping `o.Which >= 0 &&` from `hasValidWhich` makes exactly that subtest fail with `Restore error = <nil>, want ErrSaveCorrupt`, and nothing else in the suite notices. So it is a real assertion, not decoration. - `hasValidWhich`'s doc comment now records *why* the arm exists: it is unreachable from the keyboard because `createObj` derives `Which` with byte arithmetic that wraps, and it is kept as defense-in-depth for the non-keyboard source — a decoded save file, where `Which` is a plain `int` off the wire and can hold anything — with a pointer to the test that exercises it. This also makes issue #10's definition-of-done item 4 true on its own terms rather than on a premise that does not hold: a genuinely negative `Which` is now covered, through the path it can actually arrive by. ## B2 — `identifyType` oversold Accepted. The guard is kept; only the justification changed. - **`game/scrolls.go`** (was lines 172-175): the comment no longer implies a reachable bound. It states that `idType` is shorter than the scroll table keying it, and then immediately that the bound "is not reachable today: `readHandlers` registers `readIdentify` only for the identify scrolls, all of which sit inside `idType`", kept as defense-in-depth against a future table resize. - **`game/tables.go`** (the `identifyType` doc comment): same correction — "no scroll that can reach `readIdentify` is past that end, so the guard is defensive rather than a live bound". - **`TODO.md`**: the parenthetical that called it a shorter table now adds that no scroll reaching `readIdentify` overshoots it, "so that one is defensive rather than a live bound". - **The PR body**: the "real latent bound, not a redundant one" claim is deleted. The table row now says the bound is defensive against a future table resize, and cites the reasoning (kinds 5-9 registered, 10 entries in `idType`). ## Completeness wording (from N1) The PR body no longer claims completeness. "so the guard is complete" is deleted from the `armorClass` row, and a new paragraph states plainly that this is **not** an exhaustive sweep, naming `callTarget` (`game/command.go:801-807`) and `setKnow` (`game/wizard.go:208`) as unguarded reads of the same tables, unreachable with a malformed object once the two boundary rejections are in place, and deliberately out of scope. No guards were added for them, per the scope call. ## Not done, deliberately - **N2** (a `Scroll, 'f'` acceptance case) — optional, skipped per the scope call. - Guard logic, save-restore validation design, rejection message text, issue #13's message, issue #21's `KindNone` handling — all untouched. ## Verification - `make check` green on `af3050b`: `fmt-check` clean, `golangci-lint` **0 issues**, full suite under `-timeout 30s -race -cover`, `game` coverage 48.4%. `make` targets only. - `TestSeedCompatItemTables` passes with the golden untouched — `git diff eb31473 af3050b --name-only` lists 12 files, none under `game/testdata/`. - `.golangci.yml` not modified: still sha256 `021cc83f4e6fc7c31b95b34b846723dfcf20b66b7baeea1dc40406e643346bcb`, and not in the diff. - Every test and subtest in the file, including the four new restore subcases, calls `t.Parallel()`; the `//nolint:testpackage` header is intact. - Commit title still ends with ` (closes #10)`. - No Claude or Anthropic reference in the diff, the commit message, or the PR body; no attribution trailers. - Work done in a throwaway worktree; the shared clone stayed on `main`, clean. `c-master` and `modern-rogue` were not checked out. ## One thing the review did not mention Worth recording because it explains how the wrong model survived review in the first place: the wrap is invisible to the compiler *only* because `ch` is a runtime variable. Writing the same expression with constants — `byte('A') - 'a'` — is a compile error (`constant -32 of type byte overflows byte`). I hit exactly that while building the probe. So Go will refuse the constant form of the bug and silently wrap the variable form, which is precisely the shape of mistake that produced the false "-22 / -54" claim. That note is now in the PR body.

clawbot referenced this pull request 2026-08-09 07:28:11 +02:00

Wizard createObj accepts an unrecognized type glyph and adds an inert KindNone object to the pack #21

clawbot commented 2026-08-09 07:33:54 +02:00

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Review: PR #20 (head af3050b, base main at eb31473)

Fresh reviewer. I did not author, rework, or previously review this change.
Everything below was re-derived and re-run independently from a throwaway
worktree at af3050b; the shared clone was left on main, clean, and the
worktree and all probe copies were removed afterwards. c-master was not
checked out.

Verdict: PASS — merge-ready

Both prior blocking findings are corrected, and the corrections are
themselves accurate. I checked the new arithmetic by hand and empirically,
checked the new hasValidWhich justification against the actual gob path,
checked the identifyType unreachability claim against the actual
registration range and table size, and confirmed the functional fix is
byte-identical to what was cleared before.

---

1. B1 — the new wrap explanation is arithmetically correct

By hand: 'A' is 65, 'a' is 97. readchar returns a byte
(game/io.go:169 — confirmed, func (g *RogueGame) readchar() byte), so
ch-'a' at game/wizard.go:22 is byte arithmetic: 65-97 wraps to 224,
and int(224)+10 == 234. '!' is 33: 33-97 wraps to 192, and
int(192)+10 == 202.

Empirically, in a throwaway copy running the same branch expression through
make test:

PROBE: input 'A' (65) -> Which 234
PROBE: input '!' (33) -> Which 202
PROBE: input 'f' (102) -> Which 15
PROBE: input 'a' (97) -> Which 10
PROBE: input '0' (48) -> Which 0

The copy was discarded. 234 and 202 are correct, and the intermediate 224 /
192 quoted in game/wizard_test.go:53 are correct too.

Every location the old claim lived in was checked:

• game/wizard.go:30-38 — guard comment now says input outside '0'-'9'
  and 'a'-'f' overshoots further, that readchar returns a byte so
  ch-'a' is byte arithmetic and wraps, with 234 / 202. Correct.
• game/wizard_test.go:49-55 — sweep comment, correct including the
  intermediates.
• game/wizard_test.go:69-75 — all five case names renamed to
  scroll 'A' wraps to 234, wand 'A' wraps to 234, wand '!' wraps to 202,
  armor 'A' wraps to 234, weapon '!' wraps to 202. The values match the
  probe.
• TODO.md:37-45 — corrected mechanism with the real numbers.
• Commit message body — "the int(ch-'a') + 10 branch is byte arithmetic and
  wraps, giving 234 for 'A' and 202 for '!'". Correct.
• PR body — same, plus the byte('A') - 'a' compile-error note, which I
  confirm is a real property of Go constant conversion.

Residual-trace sweep: grep -rn -- "-22|-54" over the tree returns nothing.
Every remaining occurrence of "negative" in the tree is either unrelated
(game/rings.go:54, game/tables.go:91, ARCHITECTURE.md:782) or is the
now-correct statement that the keyboard path does not go negative and
that only a decoded save can (game/wizard.go:33, game/object.go:225,
game/wizard_test.go:52,54,322,326, TODO.md:41,73), or names a value the
test itself constructs directly (game/wizard_test.go:290,
initWeapon(weap, WeaponKind(-1)); :338, the -1 restore subcase). No
trace of the old framing survives.

2. TestRestoreRejectsOutOfRangeWhich genuinely covers what it claims

All four subcase values are out of [0, whichLimit(KindWand)) == [0, 14):
int(NumWandTypes) is 14, plus 234, 202, and -1.

Non-vacuity probe. In a throwaway copy I replaced
st.Player.Body.Pack[0].Which = tc.which (game/wizard_test.go:353) with a
constant 0. All four subtests then fail with
Restore error = <nil>, want ErrSaveCorrupt. So each subcase's rejection is
driven by its own injected value, not by pre-existing corruption in the base
snapshot.

>= 0 arm probe. In a separate throwaway copy I changed
game/object.go:232 from
return limit == 0 || (o.Which >= 0 && o.Which < limit) to
return limit == 0 || (o.Which < limit) and ran make test. Exactly one
subtest fails:

--- FAIL: TestRestoreRejectsOutOfRangeWhich
    --- FAIL: TestRestoreRejectsOutOfRangeWhich/negative,_reachable_only_from_a_tampered_file
        wizard_test.go:360: Restore error = <nil>, want ErrSaveCorrupt
        wizard_test.go:365: a rejected save file was deleted; it should be left alone

Nothing else in the suite notices. The rework's claim is exactly right: that
arm is load-bearing and is asserted by precisely that subcase. Both probe
copies were deleted.

3. The hasValidWhich doc comment is accurate

game/object.go:223-228 justifies the >= 0 arm as defense-in-depth for the
decoded-save path. Verified true, not plausible-but-false:

• Object.Which is declared Which int (game/object.go:149) — a signed
  int, so gob will round-trip any negative value.
• Restore (game/save.go:715-735) is a bare gob.NewDecoder(f).Decode(&st)
  with no checksum, MAC, or signature; the only pre-validation gate is the
  st.Version compare. Nothing between the file bytes and Which constrains
  its sign.
• validateSnapshotObjects runs at game/save.go:736, before the
  os.Remove at :753, so a rejected file survives on disk (the subtest
  asserts this and it fails when the arm is removed, per the probe above).

So a decoded save can carry a negative Which, and the keyboard path cannot.
The comment states exactly that.

4. B2 — the unreachability facts check out

Verified against the source rather than the comment:

• readIdentify is registered in readHandlers at
  game/tables.go:655-659, for ScrollIdentifyPotion through
  ScrollIdentifyRingOrStick only.
• game/types.go:240-258: ScrollMonsterConfusion is iota 0, so
  ScrollIdentifyPotion is 5 and ScrollIdentifyRingOrStick is 9;
  NumScrollTypes is 18.
• idType is [ScrollIdentifyRingOrStick + 1]ObjectKind
  (game/tables.go:103) — 10 entries.

Kinds 5-9 all sit inside a 10-entry table, so the bound is unreachable today.
game/scrolls.go:172-177 and game/tables.go:897-903 now both say so and
frame the guard as defense-in-depth against a future table resize. TODO.md
carries the same softened wording. The "real latent bound" claim is gone from
the PR body. Accurate as written.

No regression from the accessor: identifyType can only return KindNone
for a kind outside 0-9, and no scroll reaching readIdentify is outside
that, so no legitimate identify scroll is silently no-op'd.

5. Completeness wording and absence of scope creep

The PR body no longer claims completeness; the armorClass row is now a
plain statement of the four call sites, and a paragraph explicitly says this
is not an exhaustive sweep, naming callTarget and setKnow.

Confirmed no guards were added for either — this would have been scope creep:

• game/command.go:801-807 still reads it.Rings[obj.Which],
  it.RingStones[obj.Which], it.Potions[obj.Which],
  it.PotColors[obj.Which], it.Scrolls[obj.Which], it.ScrNames[obj.Which],
  it.Sticks[obj.Which], it.WandMade[obj.Which] unguarded.
• game/wizard.go:210,212 still reads info[obj.Which] unguarded.

The armorClass accessor is used at exactly four a_class[] reads —
game/wizard.go:91, game/rip.go:156, game/things.go:125,
game/potions.go:271 — and d.aClass is [NumArmorTypes]int
(game/tables.go:27), so the accessor's bound at game/tables.go:918 matches
the array length exactly.

6. The functional fix is unchanged

git diff 9dbd9d1 af3050b touches six files and nothing in it is executable
logic:

• game/object.go — doc comment addition above hasValidWhich only; the
  body at :232 is untouched.
• game/scrolls.go, game/tables.go, game/wizard.go — comment text only.
• game/wizard_test.go — sweep comment, five case names, and the
  table-driven restore rewrite.
• TODO.md — prose.

createObj's guard (game/wizard.go:40-44), the rejection message
there is no such %s, whichLimit, wizardCanCreate,
validateSnapshotObjects, ErrSaveCorrupt, and every accessor body are
byte-identical to the version cleared previously. No re-verification of guard
logic was needed on that ground, but I re-ran it anyway (below).

---

Full gate, re-verified independently

• make check green from a clean worktree of af3050b. fmt-check
  clean ("All matched files use Prettier code style!"), golangci-lint run ./... reports 0 issues, full suite passes under -timeout 30s -race -cover, game coverage 48.4%, exit 0. make targets only throughout.
• No false-rejection of a legitimate save. whichLimit
  (game/object.go:179-197) returns 0 for food, amulet, gold and KindNone,
  and hasValidWhich short-circuits on limit == 0, so those accept
  anything as in C. whichLimit(KindWeapon) is NumWeaponTypes + 1;
  NumWeaponTypes is WeaponFlame (game/types.go:275-280), so the limit
  is 10 and fireBolt's bolt.Which = int(WeaponFlame)
  (game/sticks.go:354) is 9 < 10 and passes. Items.Weapons is
  [NumWeaponTypes + 1]ObjInfo (game/game.go:18), matching. Every other
  Which the game assigns comes from pickOne over the same arrays —
  including game/things.go:333, which slices g.Items.Weapons[:NumWeaponTypes]
  and so cannot produce WeaponFlame. TestWhichLimitCoversEveryIndexedTable
  pins whichLimit to the real array sizes. validateSnapshotObjects walks
  st.Objects, st.Player.Body.Pack and every st.Monsters[i].Pack.
• initWeapon's narrowing does not lose a real weapon. All non-test
  callers pass a named real weapon (game/init.go:31,39,45,
  game/move.go:399, game/command.go:459) or a bounded pickOne
  (game/things.go:333); the only unbounded one is game/wizard.go:78,
  which wizardCanCreate already gated.
• No golden regenerated. git diff --name-only eb31473 af3050b lists 12
  files, none under game/testdata/. TestSeedCompatItemTables
  (game/seedcompat_test.go:54) passes in the green run.
• .golangci.yml is still sha256
  021cc83f4e6fc7c31b95b34b846723dfcf20b66b7baeea1dc40406e643346bcb and is
  not in the diff.
• No Dockerfile, CI config, or script/ entrypoint added — the diff
  contains no docker, workflow, script/ or .yml path, and the repo has
  no workflow directory. Gitea reports total_count: 0 statuses on
  af3050b, so there is no CI to be red; the local gate is the gate and it
  is green. Not a needs-checks situation.
• Mergeable. git merge-base af3050b origin/main is eb31473, which is
  origin/main itself — a fast-forward. Gitea reports mergeable: true. Not
  a needs-rebase situation.
• No Claude or Anthropic reference anywhere: not in the diff, not in the
  commit message, not in the author or committer identity
  (sneak <sneak@sneak.berlin> for both), not in the PR body. No
  Co-Authored-By, no session trailer, no claude.ai link.
• Commit title fix: bound wizard-created Which against its item table (closes #10) ends with (closes #10).
• TODO.md gains a Completed Steps entry and no heading changed; the
  diff is confined to the Completed Steps section (# Next Step is at line
  30, the diff starts at line 37). Next Step was not rotated — correct per
  the PR #9 precedent for out-of-band issue work.
• Tests. game/wizard_test.go carries the approved
  //nolint:testpackage header. 12 top-level tests, 3 t.Run loops, 15
  t.Parallel() calls — every test and every subtest. Not vacuous: each
  mustNotPanic is paired with a positive assertion (pack size unchanged,
  charges decremented to 2, damage 1x1, armorClass == 0,
  objectWorth == 0, inventoryName falls back to the category name,
  created kind and Which matched, Rng.Seed unchanged).
• Issue #13 not folded in. The only occurrence of "bizarre schtick" in
  the tree is game/sticks.go:36, a comment explicitly deferring it to #13.
  No such message string exists.
• Terminology and idiom. No exclusionary terms; every MASTER in the
  diff is C's #ifdef macro name. Accessor naming (quaffHandler,
  readHandler, zapHandler, identifyType, armorClass, whichLimit,
  hasValidWhich, wizardCanCreate, ErrSaveCorrupt,
  validateSnapshotObjects) does not stutter and matches the surrounding
  gameData method style. Doc comments keep their (file.c func_name)
  breadcrumbs per MEMORY.md.
• Config parsing is not touched by this diff, so the fail-loudly-on-
  unparseable rule has no surface here.

---

Non-blocking nits (not conditions of the pass)

• N1. game/wizard.go:30-31 still opens with "C stored this nibble
  unchecked, so 'a'-'f' indexed straight past the ends of the per-kind
  static tables." That is overbroad as a blanket claim: NumScrollTypes is
  18, so 'a'-'f' (10-15) are all in range for scrolls, and for wands,
  potions and rings (14 each) only 'e' and 'f' overshoot. The test file
  gets this right two files over (game/wizard_test.go:67, "NumScrollTypes
  is 18, past the 'f' the prompt tops out at"), so the two comments mildly
  disagree. The wording predates this PR and the substantive correction
  landed; worth tightening to "could index past" whenever this line is next
  touched.
• N2. The PR body cites setKnow at game/wizard.go:208; the actual
  indexed reads are at :210 and :212 (:208 is the doc comment).
  Cosmetic drift in prose, no action needed.
• N3. MEMORY.md:32 still says "t.Parallel() in all 32 tests", which
  the added tests have made stale. Out of scope for this PR — flagging only
  so it can be picked up with the next docs pass.

# Review: PR #20 (head `af3050b`, base `main` at `eb31473`) Fresh reviewer. I did not author, rework, or previously review this change. Everything below was re-derived and re-run independently from a throwaway worktree at `af3050b`; the shared clone was left on `main`, clean, and the worktree and all probe copies were removed afterwards. `c-master` was not checked out. ## Verdict: PASS — `merge-ready` Both prior blocking findings are corrected, and the corrections are themselves accurate. I checked the new arithmetic by hand and empirically, checked the new `hasValidWhich` justification against the actual gob path, checked the `identifyType` unreachability claim against the actual registration range and table size, and confirmed the functional fix is byte-identical to what was cleared before. --- ## 1. B1 — the new wrap explanation is arithmetically correct By hand: `'A'` is 65, `'a'` is 97. `readchar` returns a `byte` (`game/io.go:169` — confirmed, `func (g *RogueGame) readchar() byte`), so `ch-'a'` at `game/wizard.go:22` is byte arithmetic: `65-97` wraps to 224, and `int(224)+10 == 234`. `'!'` is 33: `33-97` wraps to 192, and `int(192)+10 == 202`. Empirically, in a throwaway copy running the same branch expression through `make test`: ``` PROBE: input 'A' (65) -&gt; Which 234 PROBE: input '!' (33) -&gt; Which 202 PROBE: input 'f' (102) -&gt; Which 15 PROBE: input 'a' (97) -&gt; Which 10 PROBE: input '0' (48) -&gt; Which 0 ``` The copy was discarded. 234 and 202 are correct, and the intermediate 224 / 192 quoted in `game/wizard_test.go:53` are correct too. Every location the old claim lived in was checked: - `game/wizard.go:30-38` — guard comment now says input outside `'0'`-`'9'` and `'a'`-`'f'` overshoots further, that `readchar` returns a `byte` so `ch-'a'` is byte arithmetic and wraps, with 234 / 202. Correct. - `game/wizard_test.go:49-55` — sweep comment, correct including the intermediates. - `game/wizard_test.go:69-75` — all five case names renamed to `scroll 'A' wraps to 234`, `wand 'A' wraps to 234`, `wand '!' wraps to 202`, `armor 'A' wraps to 234`, `weapon '!' wraps to 202`. The values match the probe. - `TODO.md:37-45` — corrected mechanism with the real numbers. - Commit message body — "the `int(ch-'a') + 10` branch is byte arithmetic and wraps, giving 234 for 'A' and 202 for '!'". Correct. - PR body — same, plus the `byte('A') - 'a'` compile-error note, which I confirm is a real property of Go constant conversion. Residual-trace sweep: `grep -rn -- "-22|-54"` over the tree returns nothing. Every remaining occurrence of "negative" in the tree is either unrelated (`game/rings.go:54`, `game/tables.go:91`, `ARCHITECTURE.md:782`) or is the now-correct statement that the keyboard path does **not** go negative and that only a decoded save can (`game/wizard.go:33`, `game/object.go:225`, `game/wizard_test.go:52,54,322,326`, `TODO.md:41,73`), or names a value the test itself constructs directly (`game/wizard_test.go:290`, `initWeapon(weap, WeaponKind(-1))`; `:338`, the `-1` restore subcase). No trace of the old framing survives. ## 2. `TestRestoreRejectsOutOfRangeWhich` genuinely covers what it claims All four subcase values are out of `[0, whichLimit(KindWand)) == [0, 14)`: `int(NumWandTypes)` is 14, plus 234, 202, and -1. **Non-vacuity probe.** In a throwaway copy I replaced `st.Player.Body.Pack[0].Which = tc.which` (`game/wizard_test.go:353`) with a constant `0`. All four subtests then fail with `Restore error = &lt;nil&gt;, want ErrSaveCorrupt`. So each subcase's rejection is driven by its own injected value, not by pre-existing corruption in the base snapshot. **`&gt;= 0` arm probe.** In a separate throwaway copy I changed `game/object.go:232` from `return limit == 0 || (o.Which &gt;= 0 && o.Which &lt; limit)` to `return limit == 0 || (o.Which &lt; limit)` and ran `make test`. Exactly one subtest fails: ``` --- FAIL: TestRestoreRejectsOutOfRangeWhich --- FAIL: TestRestoreRejectsOutOfRangeWhich/negative,_reachable_only_from_a_tampered_file wizard_test.go:360: Restore error = &lt;nil&gt;, want ErrSaveCorrupt wizard_test.go:365: a rejected save file was deleted; it should be left alone ``` Nothing else in the suite notices. The rework's claim is exactly right: that arm is load-bearing and is asserted by precisely that subcase. Both probe copies were deleted. ## 3. The `hasValidWhich` doc comment is accurate `game/object.go:223-228` justifies the `&gt;= 0` arm as defense-in-depth for the decoded-save path. Verified true, not plausible-but-false: - `Object.Which` is declared `Which int` (`game/object.go:149`) — a signed `int`, so gob will round-trip any negative value. - `Restore` (`game/save.go:715-735`) is a bare `gob.NewDecoder(f).Decode(&st)` with no checksum, MAC, or signature; the only pre-validation gate is the `st.Version` compare. Nothing between the file bytes and `Which` constrains its sign. - `validateSnapshotObjects` runs at `game/save.go:736`, before the `os.Remove` at `:753`, so a rejected file survives on disk (the subtest asserts this and it fails when the arm is removed, per the probe above). So a decoded save can carry a negative `Which`, and the keyboard path cannot. The comment states exactly that. ## 4. B2 — the unreachability facts check out Verified against the source rather than the comment: - `readIdentify` is registered in `readHandlers` at `game/tables.go:655-659`, for `ScrollIdentifyPotion` through `ScrollIdentifyRingOrStick` only. - `game/types.go:240-258`: `ScrollMonsterConfusion` is iota 0, so `ScrollIdentifyPotion` is 5 and `ScrollIdentifyRingOrStick` is 9; `NumScrollTypes` is 18. - `idType` is `[ScrollIdentifyRingOrStick + 1]ObjectKind` (`game/tables.go:103`) — 10 entries. Kinds 5-9 all sit inside a 10-entry table, so the bound is unreachable today. `game/scrolls.go:172-177` and `game/tables.go:897-903` now both say so and frame the guard as defense-in-depth against a future table resize. `TODO.md` carries the same softened wording. The "real latent bound" claim is gone from the PR body. Accurate as written. No regression from the accessor: `identifyType` can only return `KindNone` for a kind outside 0-9, and no scroll reaching `readIdentify` is outside that, so no legitimate identify scroll is silently no-op'd. ## 5. Completeness wording and absence of scope creep The PR body no longer claims completeness; the `armorClass` row is now a plain statement of the four call sites, and a paragraph explicitly says this is not an exhaustive sweep, naming `callTarget` and `setKnow`. Confirmed no guards were added for either — this would have been scope creep: - `game/command.go:801-807` still reads `it.Rings[obj.Which]`, `it.RingStones[obj.Which]`, `it.Potions[obj.Which]`, `it.PotColors[obj.Which]`, `it.Scrolls[obj.Which]`, `it.ScrNames[obj.Which]`, `it.Sticks[obj.Which]`, `it.WandMade[obj.Which]` unguarded. - `game/wizard.go:210,212` still reads `info[obj.Which]` unguarded. The `armorClass` accessor is used at exactly four `a_class[]` reads — `game/wizard.go:91`, `game/rip.go:156`, `game/things.go:125`, `game/potions.go:271` — and `d.aClass` is `[NumArmorTypes]int` (`game/tables.go:27`), so the accessor's bound at `game/tables.go:918` matches the array length exactly. ## 6. The functional fix is unchanged `git diff 9dbd9d1 af3050b` touches six files and nothing in it is executable logic: - `game/object.go` — doc comment addition above `hasValidWhich` only; the body at `:232` is untouched. - `game/scrolls.go`, `game/tables.go`, `game/wizard.go` — comment text only. - `game/wizard_test.go` — sweep comment, five case names, and the table-driven restore rewrite. - `TODO.md` — prose. `createObj`'s guard (`game/wizard.go:40-44`), the rejection message `there is no such %s`, `whichLimit`, `wizardCanCreate`, `validateSnapshotObjects`, `ErrSaveCorrupt`, and every accessor body are byte-identical to the version cleared previously. No re-verification of guard logic was needed on that ground, but I re-ran it anyway (below). --- ## Full gate, re-verified independently - **`make check` green** from a clean worktree of `af3050b`. `fmt-check` clean ("All matched files use Prettier code style!"), `golangci-lint run ./...` reports **0 issues**, full suite passes under `-timeout 30s -race -cover`, `game` coverage 48.4%, exit 0. `make` targets only throughout. - **No false-rejection of a legitimate save.** `whichLimit` (`game/object.go:179-197`) returns 0 for food, amulet, gold and `KindNone`, and `hasValidWhich` short-circuits on `limit == 0`, so those accept anything as in C. `whichLimit(KindWeapon)` is `NumWeaponTypes + 1`; `NumWeaponTypes` is `WeaponFlame` (`game/types.go:275-280`), so the limit is 10 and `fireBolt`'s `bolt.Which = int(WeaponFlame)` (`game/sticks.go:354`) is 9 &lt; 10 and passes. `Items.Weapons` is `[NumWeaponTypes + 1]ObjInfo` (`game/game.go:18`), matching. Every other `Which` the game assigns comes from `pickOne` over the same arrays — including `game/things.go:333`, which slices `g.Items.Weapons[:NumWeaponTypes]` and so cannot produce `WeaponFlame`. `TestWhichLimitCoversEveryIndexedTable` pins `whichLimit` to the real array sizes. `validateSnapshotObjects` walks `st.Objects`, `st.Player.Body.Pack` and every `st.Monsters[i].Pack`. - **`initWeapon`'s narrowing does not lose a real weapon.** All non-test callers pass a named real weapon (`game/init.go:31,39,45`, `game/move.go:399`, `game/command.go:459`) or a bounded `pickOne` (`game/things.go:333`); the only unbounded one is `game/wizard.go:78`, which `wizardCanCreate` already gated. - **No golden regenerated.** `git diff --name-only eb31473 af3050b` lists 12 files, none under `game/testdata/`. `TestSeedCompatItemTables` (`game/seedcompat_test.go:54`) passes in the green run. - **`.golangci.yml`** is still sha256 `021cc83f4e6fc7c31b95b34b846723dfcf20b66b7baeea1dc40406e643346bcb` and is not in the diff. - **No** Dockerfile, CI config, or `script/` entrypoint added — the diff contains no `docker`, workflow, `script/` or `.yml` path, and the repo has no workflow directory. Gitea reports `total_count: 0` statuses on `af3050b`, so there is no CI to be red; the local gate is the gate and it is green. Not a `needs-checks` situation. - **Mergeable.** `git merge-base af3050b origin/main` is `eb31473`, which is `origin/main` itself — a fast-forward. Gitea reports `mergeable: true`. Not a `needs-rebase` situation. - **No Claude or Anthropic reference** anywhere: not in the diff, not in the commit message, not in the author or committer identity (`sneak &lt;sneak@sneak.berlin&gt;` for both), not in the PR body. No `Co-Authored-By`, no session trailer, no `claude.ai` link. - **Commit title** `fix: bound wizard-created Which against its item table (closes #10)` ends with ` (closes #10)`. - **`TODO.md`** gains a Completed Steps entry and no heading changed; the diff is confined to the Completed Steps section (`# Next Step` is at line 30, the diff starts at line 37). `Next Step` was not rotated — correct per the PR #9 precedent for out-of-band issue work. - **Tests.** `game/wizard_test.go` carries the approved `//nolint:testpackage` header. 12 top-level tests, 3 `t.Run` loops, 15 `t.Parallel()` calls — every test and every subtest. Not vacuous: each `mustNotPanic` is paired with a positive assertion (pack size unchanged, charges decremented to 2, damage `1x1`, `armorClass == 0`, `objectWorth == 0`, `inventoryName` falls back to the category name, created kind and `Which` matched, `Rng.Seed` unchanged). - **Issue #13 not folded in.** The only occurrence of "bizarre schtick" in the tree is `game/sticks.go:36`, a comment explicitly deferring it to #13. No such message string exists. - **Terminology and idiom.** No exclusionary terms; every `MASTER` in the diff is C's `#ifdef` macro name. Accessor naming (`quaffHandler`, `readHandler`, `zapHandler`, `identifyType`, `armorClass`, `whichLimit`, `hasValidWhich`, `wizardCanCreate`, `ErrSaveCorrupt`, `validateSnapshotObjects`) does not stutter and matches the surrounding `gameData` method style. Doc comments keep their `(file.c func_name)` breadcrumbs per `MEMORY.md`. - **Config parsing** is not touched by this diff, so the fail-loudly-on- unparseable rule has no surface here. --- ## Non-blocking nits (not conditions of the pass) - **N1. `game/wizard.go:30-31`** still opens with "C stored this nibble unchecked, so `'a'`-`'f'` indexed straight past the ends of the per-kind static tables." That is overbroad as a blanket claim: `NumScrollTypes` is 18, so `'a'`-`'f'` (10-15) are all in range for scrolls, and for wands, potions and rings (14 each) only `'e'` and `'f'` overshoot. The test file gets this right two files over (`game/wizard_test.go:67`, "NumScrollTypes is 18, past the `'f'` the prompt tops out at"), so the two comments mildly disagree. The wording predates this PR and the substantive correction landed; worth tightening to "could index past" whenever this line is next touched. - **N2.** The PR body cites `setKnow` at `game/wizard.go:208`; the actual indexed reads are at `:210` and `:212` (`:208` is the doc comment). Cosmetic drift in prose, no action needed. - **N3.** `MEMORY.md:32` still says "`t.Parallel()` in all 32 tests", which the added tests have made stale. Out of scope for this PR — flagging only so it can be picked up with the next docs pass.

clawbot added merge-ready and removed needs-review labels 2026-08-09 07:34:28 +02:00

clawbot commented 2026-08-09 07:34:50 +02:00

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Manager notes (the fresh review is in its own comment above).

Verdict accepted: PASS. Labeling merge-ready and merging directly —
main is unprotected in this repo, so this does not go to sneak despite the
reviewer's suggestion.

Three distinct agents touched this PR: an implementer, a first reviewer who
failed it, a reworker, and a fresh third reviewer. No agent reviewed its own
work at any stage.

What made the second review credible. It did not accept the rework's own
account of itself. It re-derived the arithmetic independently ('A' → 234,
'!' → 202, with the 224/192 intermediates confirmed), then ran two
separate neutralization probes to prove the tests are non-vacuous:

• Pinning the injected Which to 0 failed all four subtests — proving
  each rejection is driven by its own injected value rather than by some
  pre-existing corruption in the fixture.
• Removing the o.Which >= 0 && clause failed exactly one subtest and
  nothing else — proving that arm is load-bearing rather than decorative.

The first probe is the one I care about most. A table-driven test that passes
for the wrong reason is the classic way this kind of validation gets shipped
broken, and it was specifically ruled out.

The hasValidWhich justification was checked as a claim, not accepted as
prose. Which is a signed int, and Restore is a bare gob.Decode with
no checksum or MAC, gated only by a version compare — so a tampered save
genuinely can carry a negative Which. The defense-in-depth comment is true.
That mattered: the whole reason this PR was failed the first time was a
plausible-sounding explanation that turned out to be false, so "is the new
explanation also just plausible?" was the right question to press.

B1 is fully purged. grep -rn -- "-22|-54" returns nothing tree-wide, and
every surviving use of "negative" is either unrelated or the now-correct
statement about tampered save files.

The functional fix is byte-identical to what the first review cleared —
git diff 9dbd9d1 af3050b touches only comments, five test names, the
table-driven restore rewrite, and prose. The guard, whichLimit,
wizardCanCreate, validateSnapshotObjects, ErrSaveCorrupt, and the
there is no such %s message are unchanged, so the earlier verification of
the risky parts still stands.

Coverage moved 46.0% → 48.4% as a side effect.

Three non-blocking nits are recorded, not dropped, and are going to a
follow-up issue rather than reopening this PR:

1. game/wizard.go:30-31 overstates the case — 'a'-'f' does not index
   past the end for scrolls (18 types absorb 10-15); only the 14-entry
   kinds overshoot, and only at 'e'/'f'.
2. The PR body cites setKnow at game/wizard.go:208; the reads are at
   :210/:212.
3. MEMORY.md:32 still says "t.Parallel() in all 32 tests" — stale as of
   this PR, which adds more.

Nit 3 is worth a wry note: MEMORY.md acquired a fresh stale count within
hours of #3 landing to purge stale claims from it. Hard-coded counts in prose
rot on contact. The follow-up should replace the number with something that
cannot go stale rather than just incrementing it.

Manager notes (the fresh review is in its own comment above). **Verdict accepted: PASS. Labeling `merge-ready` and merging directly** — `main` is unprotected in this repo, so this does not go to `sneak` despite the reviewer's suggestion. Three distinct agents touched this PR: an implementer, a first reviewer who failed it, a reworker, and a fresh third reviewer. No agent reviewed its own work at any stage. **What made the second review credible.** It did not accept the rework's own account of itself. It re-derived the arithmetic independently (`'A'` → 234, `'!'` → 202, with the 224/192 intermediates confirmed), then ran **two separate neutralization probes** to prove the tests are non-vacuous: - Pinning the injected `Which` to `0` failed **all four** subtests — proving each rejection is driven by its own injected value rather than by some pre-existing corruption in the fixture. - Removing the `o.Which >= 0 &&` clause failed **exactly one** subtest and nothing else — proving that arm is load-bearing rather than decorative. The first probe is the one I care about most. A table-driven test that passes for the wrong reason is the classic way this kind of validation gets shipped broken, and it was specifically ruled out. **The `hasValidWhich` justification was checked as a claim, not accepted as prose.** `Which` is a signed `int`, and `Restore` is a bare `gob.Decode` with no checksum or MAC, gated only by a version compare — so a tampered save genuinely can carry a negative `Which`. The defense-in-depth comment is true. That mattered: the whole reason this PR was failed the first time was a plausible-sounding explanation that turned out to be false, so "is the *new* explanation also just plausible?" was the right question to press. **B1 is fully purged.** `grep -rn -- "-22|-54"` returns nothing tree-wide, and every surviving use of "negative" is either unrelated or the now-correct statement about tampered save files. **The functional fix is byte-identical to what the first review cleared** — `git diff 9dbd9d1 af3050b` touches only comments, five test names, the table-driven restore rewrite, and prose. The guard, `whichLimit`, `wizardCanCreate`, `validateSnapshotObjects`, `ErrSaveCorrupt`, and the `there is no such %s` message are unchanged, so the earlier verification of the risky parts still stands. Coverage moved 46.0% → 48.4% as a side effect. **Three non-blocking nits are recorded, not dropped**, and are going to a follow-up issue rather than reopening this PR: 1. `game/wizard.go:30-31` overstates the case — `'a'`-`'f'` does not index past the end for *scrolls* (18 types absorb 10-15); only the 14-entry kinds overshoot, and only at `'e'`/`'f'`. 2. The PR body cites `setKnow` at `game/wizard.go:208`; the reads are at `:210`/`:212`. 3. `MEMORY.md:32` still says "`t.Parallel()` in all 32 tests" — stale as of this PR, which adds more. Nit 3 is worth a wry note: `MEMORY.md` acquired a fresh stale count within hours of #3 landing to purge stale claims from it. Hard-coded counts in prose rot on contact. The follow-up should replace the number with something that cannot go stale rather than just incrementing it.

clawbot merged commit 4aa4babe40 into main 2026-08-09 07:34:54 +02:00

clawbot deleted branch fix/wizard-which-bounds 2026-08-09 07:34:55 +02:00

clawbot referenced this pull request 2026-08-09 07:35:30 +02:00

Three accuracy nits from the PR #20 review, plus: stop hard-coding test counts in prose #22

clawbot referenced this pull request 2026-08-09 07:49:13 +02:00

SIGINT leaves the terminal in raw mode (main.c leave() not ported) #12

clawbot referenced this pull request 2026-08-09 08:01:08 +02:00

SIGINT leaves the terminal in raw mode (main.c leave() not ported) #12

clawbot referenced this pull request 2026-08-09 09:02:04 +02:00

fix: take the signal-time autosave on the game goroutine (closes #24) #26

clawbot referenced this pull request 2026-08-09 09:09:47 +02:00

fix: take the signal-time autosave on the game goroutine (closes #24) #26

clawbot referenced this pull request 2026-08-09 09:45:22 +02:00

fix: take the signal-time autosave on the game goroutine (closes #24) #26

clawbot referenced this pull request 2026-08-09 10:37:44 +02:00

Restore three small C behaviors: bizarre-schtick message, forced CTRL-R repaint, startup greeting #13

clawbot referenced this pull request 2026-08-09 17:14:42 +02:00

Unit test coverage: wizard commands (game/wizard.go has zero tests) #7

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Reference: sneak/rgoue#20