Rollup merge of #137165 - thaliaarchi:file-tell, r=ChrisDenton

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Use `tell` for `<File as Seek>::stream_position`

Some platforms have a more efficient way to get the current offset of the file than by seeking. For example, Wasi has `fd_tell` and SOLID has `SOLID_FS_Ftell`. Implement `<File as Seek>::stream_position()` in terms of those.

I do not use any APIs that were not already used in `std`. Although, the `libc` crate has [`ftell`](https://docs.rs/libc/latest/libc/fn.ftell.html), [`ftello`](https://docs.rs/libc/latest/libc/fn.ftello.html), and [`ftello64`](https://docs.rs/libc/latest/libc/fn.ftello64.html), I do not know platform coverage. It appears that Windows has no `tell`-like API.

I have checked that it builds on each relevant platform.

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Matthias Krüger 2025-02-17 17:06:10 +01:00 • committed by GitHub

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