75 lines
2.4 KiB
Rust
75 lines
2.4 KiB
Rust
//! Platform-independent platform abstraction
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//!
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//! This is the platform-independent portion of the standard library's
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//! platform abstraction layer, whereas `std::sys` is the
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//! platform-specific portion.
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//!
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//! The relationship between `std::sys_common`, `std::sys` and the
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//! rest of `std` is complex, with dependencies going in all
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//! directions: `std` depending on `sys_common`, `sys_common`
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//! depending on `sys`, and `sys` depending on `sys_common` and `std`.
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//! This is because `sys_common` not only contains platform-independent code,
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//! but also code that is shared between the different platforms in `sys`.
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//! Ideally all that shared code should be moved to `sys::common`,
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//! and the dependencies between `std`, `sys_common` and `sys` all would form a dag.
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//! Progress on this is tracked in #84187.
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#![allow(missing_docs)]
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#![allow(missing_debug_implementations)]
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#[cfg(test)]
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mod tests;
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pub mod process;
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pub mod wstr;
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pub mod wtf8;
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// common error constructors
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/// A trait for viewing representations from std types
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#[doc(hidden)]
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#[allow(dead_code)] // not used on all platforms
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pub trait AsInner<Inner: ?Sized> {
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fn as_inner(&self) -> &Inner;
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}
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/// A trait for viewing representations from std types
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#[doc(hidden)]
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#[allow(dead_code)] // not used on all platforms
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pub trait AsInnerMut<Inner: ?Sized> {
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fn as_inner_mut(&mut self) -> &mut Inner;
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}
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/// A trait for extracting representations from std types
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#[doc(hidden)]
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pub trait IntoInner<Inner> {
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fn into_inner(self) -> Inner;
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}
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/// A trait for creating std types from internal representations
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#[doc(hidden)]
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pub trait FromInner<Inner> {
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fn from_inner(inner: Inner) -> Self;
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}
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// Computes (value*numer)/denom without overflow, as long as both
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// (numer*denom) and the overall result fit into i64 (which is the case
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// for our time conversions).
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#[allow(dead_code)] // not used on all platforms
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pub fn mul_div_u64(value: u64, numer: u64, denom: u64) -> u64 {
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let q = value / denom;
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let r = value % denom;
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// Decompose value as (value/denom*denom + value%denom),
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// substitute into (value*numer)/denom and simplify.
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// r < denom, so (denom*numer) is the upper bound of (r*numer)
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q * numer + r * numer / denom
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}
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pub fn ignore_notfound<T>(result: crate::io::Result<T>) -> crate::io::Result<()> {
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match result {
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Err(err) if err.kind() == crate::io::ErrorKind::NotFound => Ok(()),
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Ok(_) => Ok(()),
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Err(err) => Err(err),
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}
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}
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