Cesarus85--mjolnir-vr/docs/object_matching_logs/libcmt_wtox_obj.md

libs/libcmt/wtox.obj exact-match ledger

This isolated atomic lane starts from authoritative campaign commit 254e9ad6. Configuration index 814 was MISSING; the object was absent from config/parked.json, production history, prior matching logs, active worktrees, and the other agents' claims.

Plain-English behavior

The object provides Microsoft's wide-character decimal conversion family. _wtol skips Unicode whitespace, accepts one optional plus or minus sign, then accumulates every recognized Unicode decimal digit in a signed long. _wtoi is the corresponding int wrapper. _wtoi64 performs the same operation with a 64-bit accumulator. Like the original CRT routines, these functions do not diagnose overflow and stop at the first non-digit.

Primary provenance and January inventory

The exact obj\i386\wtox.obj member was extracted from the local XDK 3911 libcmt.lib before production source was written. It compares strict-equal to the January split object for every runtime section. CodeView names the build input ..\wtox.c, identifies Microsoft's template source as d:\xbox-finalfre\private\sdktools\crt\crtw32\convert\atox.c, and carries ordinary .bf, .lf, and .ef records for all three functions. This proves compiled C rather than assembly.

The corresponding Microsoft 1989-2001 atox.c was recovered from the pinned Easy-Build-2k NT source mirror at commit 36fce23389e43918faf4cd88688c64aa2668ff8f. Its _UNICODE template expands directly to _wtol, _wtoi, and _wtoi64; the reconstruction keeps that algorithm and uses the XDK's typed wide-character interfaces.

January symbol	Bytes	Relocations	Normalized SHA-256
__wtol	95	2	3b8afcdd1dc923a7fd2841367a545f4b3f86b1bc792b9e04d9ece91a1553d98a
__wtoi	5	1	e8ebd827d1f36d7cfa5e5220610aa6370284d1589989363f48ac40166362d449
__wtoi64	142	3	0901640fc1ac21fb453d482d1ba5c691cff1c6b9b15d634fc3a24d384eb2365a

January owns exactly those three .text COMDATs. It owns no .data, .bss, or .rdata in this object. The rebuilt object's other sections are compiler directive/debug metadata and are not linked runtime ownership.

Measured source-shape experiments

All production measurements used XDK 3911 CL 13.00.9254.1 under the inherited, unchanged /O1 /Gy command.

ID	Readable-C shape	Result
E01	Faithfully specialize Microsoft's authenticated atox.c template for wide characters: typed wchar_t input, iswspace, _wchartodigit, the original sign local, multiply-by-ten accumulator, and the original final sign branch	Accepted on the first compile. All three functions match size, normalized bytes, and every relocation identity exactly.

The six relocations match in address, type, destination, and addend: __wtol calls _iswctype at +0x15 and __wchartodigit at +0x47; __wtoi tail-jumps to __wtol at +0x1; and __wtoi64 calls _iswctype at +0x19, __allmul at +0x4A, and __wchartodigit at +0x6B.

Original-behavior and bug audit

No confirmed implementation bug was found. The absence of null-pointer and overflow checks is intentional historical CRT behavior, so the reconstruction does not add modern defensive branches that would change semantics. Unicode digit recognition remains delegated to _wchartodigit, including the non-ASCII digit ranges implemented by the neighboring admitted object.

House, Berth, and readability audit

The final source is ordinary typed C derived from authenticated Microsoft source. Parameters are vertically formatted, returns are explicit, constants are readable, and the helper prototype is typed. There are no opaque offsets, invented structures, or misleading pseudocode.

No assembly, volatile, forced inlining, undefined behavior, byte patch, codegen cast, alignment coercion, compiler-flag change, optimizer pragma, comparator exception, or prebuilt-object substitution is used. The source preserves the original behavior while remaining useful to future readers.

Final validation

• The object was deleted and force-rebuilt with XDK 3911 under unchanged /O1 /Gy; the post-rebuild hardened comparison kept all three functions strict exact.
• Whole-object runtime ownership is exact: three expected code COMDATs and no owned data, BSS, or read-only data.
• Full halobetacache_build and libcmt_build: successful.
• progress and semantic_progress: successful; the semantic audit reports zero unit errors and accepts all three functions by strict COFF evidence.
• Admission audit: no unmarked completion candidate. Its sole contradicted shell_xbox result is the pre-existing project-wide finding and is unrelated to this object.
• Tooling tests: 179/179 passed.
• git diff --check: clean.
• Clean committed per-unit regression snapshot/check: force-rebuilt the unit, retained __wtol, __wtoi, and __wtoi64 as still_exact, and reported no changed non-exact function, failure, or warning.