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

libs/libcmt/wcschr.obj exact-match ledger

This atomic lane independently revalidates an older completed result against the current January target and campaign gates. Historical commits were treated only as leads; their labels and old build products were not trusted.

Plain-English behavior

This CRT routine walks a UTF-16 string until it either finds the requested character or reaches the string terminator. Searching for zero therefore returns the terminator itself. Searching for an absent nonzero character returns a null pointer.

Provenance and inventory

• The January object contains one public cdecl function, _wcschr.
• _wcschr owns one 34-byte .text COMDAT and has zero relocations.
• The object owns no runtime .data, .bss, or .rdata section.
• _wcschr has external storage class in both target and candidate.
• The source is compiled by XDK 3911 CL.Exe 13.00.9254.1 with the libcmt project's unchanged /O1 /Gy /I"xbox/include" flags.

Two old local commits, ad1874d7 and 0708c799, contained the same proposed source. Both descended from the old f8e8e6b campaign state. This lane did not cherry-pick either commit. It copied only the proposed source and documentation into a fresh worktree, rebuilt both target split and candidate objects, and re-established every result below on the current campaign history.

Measured source shapes

Source family	Measured result	Disposition
One ternary result after the scan	41 target-meaningful bytes rather than 34	Rejected: changes January's exit CFG.
Short-circuit scan followed by explicit found/null returns	34/34 bytes, 0/0 relocations, identical normalized hash	Accepted.

The second source shape is the ordinary readable CRT algorithm. VC7 emits the same word loads, short-circuit branches, successful pointer return, and null failure return as January. The cast on the successful return only removes the input pointer's const qualification to implement the standard C library API; it is not an artificial code-generation lever.

Current-campaign strict evidence

The final candidate was transplanted onto campaign tip ce1993b7 and rebuilt from source. The hardened comparison result is:

symbol	target size	candidate size	relocations	normalized SHA-256	result
_wcschr	34 B	34 B	0 / 0	2cef2a46aed18bbe9b60645eeb805adc3609c594390b2be35c630df1de97ae10	exact

section_infos_equal returned true. Because this is the object's only runtime code section and it owns no runtime data section, the whole object is closed; there is no unexamined sibling, anonymous table, string, or BSS symbol hidden behind the function result. The candidate's additional compiler .drectve and debug metadata are ordinary non-runtime build artifacts.

House/Berth and readability audit

The parameter list is vertical, the implementation is readable C, and every path has an explicit return. The preferred single-return rule cannot be used here without changing the proven 34-byte January control flow, so the two returns are the documented permitted exception. (void) formatting is not applicable because the function has parameters. There are no tag or object accesses requiring typed macros.

No assembly, volatile, forced inlining, undefined behavior, byte patch, alignment directive, optimization pragma, raw structure offset, comparator exception, or lane-local flag change is used. No original January bug was identified, so no bug-preservation comment is needed.

Final admission gates

The final gate results are recorded here after the clean current-tip rebuild:

• Full configured Halo build: passed.
• Full configured libcmt build: passed.
• ninja semantic_progress: passed with 3,360 accepted exact functions and zero unit errors.
• ninja progress: passed and credited wcschr.obj as a complete libcmt object. At this campaign state libcmt reports 7/476 functions and 249/55,015 code bytes exact across 6/212 objects.
• Whole-unit regression snapshot/check: passed from clean commit 43c2f676; _wcschr is still_exact, with no failures, warnings, newly-exact siblings, changed nonexact code, or ownership change.
• python -m unittest discover -s tools -p 'test_*.py' -v: 177/177 passed.