`libcmt/filedel.obj` exact-match ledger

Plain-English behavior

This Xbox CRT compatibility wrapper converts a wide-character file name into a 260-byte narrow path buffer, forces the final byte to a terminator, and asks the narrow operating-system API to delete that path.

January and XDK provenance

January owns one 57-byte external function COMDAT and no runtime data. XDK 3911 libcmt.lib contains obj\\i386\\filedel.obj; its COFF records identify ..\\filedel.c, the original Microsoft source path, and VC7. The XDK member is strict-equal to January. Its CodeView names the wide input lpFileName, the local array szPathName, and wchar_t, while the exact 0x104-byte frame proves the 260-byte path capacity.

Strict target evidence

function: ___crtDeleteFileW
size: 57 bytes
relocations: +0x20 -> _wcstombs + 0; +0x33 -> _DeleteFileA@4 + 0
normalized SHA-256: 815148338ca4d151152660fe6262cd5d7c468a93c04d449741934770492a27db
target-owned .rdata, .data, and .bss: none

Experiment record

ID	Source shape	Result
F01	Named 260-byte path, conversion, explicit last-byte terminator, return `DeleteFileA`	50/57 bytes and 2/2 relocs; missing January's defensive first-byte clear; rejected
F02	Clear both buffer endpoints around the same conversion and delete call	STRICT EXACT: 57/57 bytes, 2/2 relocations, identical hash and destinations

House/Berth and bug audit

The path capacity is named and derived from the January frame/CodeView rather than appearing as unexplained stack arithmetic.
The source is readable C with a typed wide string and one final return.
No assembly, volatile, undefined behavior, forced inline, byte forcing, alignment directive, flag change, or comparator exception is used.
Original behavior ignores conversion failure/truncation and still calls DeleteFileA. That historical weakness is preserved for byte accuracy. A safer implementation would check whether wcstombs returned (size_t)-1 or filled the buffer before attempting deletion.

The rebuilt object owns exactly the target's one external function COMDAT and introduces no runtime .rdata, .data, or .bss. Admission requires strict whole-object equality, full Halo and CRT builds, zero semantic errors, a clean forced-rebuild regression check, all 179 tests, and a clean worktree.

2.3 KiB Raw Blame History

libcmt/filedel.obj exact-match ledger