3f7166eb8b
This fixes a regression caused by https://github.com/ziglang/zig/pull/13993 As an optimization, the first call to `NtQueryDirectoryFile` would only ask for a single result and assume that if the result returned did not match the app_name exactly, then the unappended app_name did not exist. However, this relied on the assumption that the unappended app_name would always be returned first, but that only seems to be the case on NTFS. On FAT filesystems, the order of returned files can be different, which meant that it could assume the unappended file doesn't exist when it actually does. This commit fixes that by fully iterating the wildcard matches via `NtQueryDirectoryFile` and taking note of any unappended/PATHEXT-appended filenames it finds. In practice, this strategy does not introduce a speed regression compared to the previous (buggy) implementation. Benchmark 1 (10 runs): winpathbench-master.exe measurement mean ± σ min … max outliers delta wall_time 508ms ± 4.08ms 502ms … 517ms 1 (10%) 0% peak_rss 3.62MB ± 2.76KB 3.62MB … 3.63MB 0 ( 0%) 0% Benchmark 2 (10 runs): winpathbench-fat32-fix.exe measurement mean ± σ min … max outliers delta wall_time 500ms ± 21.4ms 480ms … 535ms 0 ( 0%) - 1.5% ± 2.8% peak_rss 3.62MB ± 2.76KB 3.62MB … 3.63MB 0 ( 0%) - 0.0% ± 0.1% --- Partially addresses #16374 (it fixes `zig build` on FAT32 when no `zig-cache` is present)
A general-purpose programming language and toolchain for maintaining robust, optimal, and reusable software.
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One of the best ways you can contribute to Zig is to start using it for an open-source personal project.
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