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Align os.utime float-to-duration rounding with CPython semantics #6501

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Align os.utime float-to-duration rounding with CPython semantics #6501

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fd73a9c
Initial plan
Copilot Dec 25, 2025
da24a78
Fix duration conversion rounding for os.utime
Copilot Dec 25, 2025
b911e6f
Address review feedback for duration rounding
Copilot Dec 25, 2025
7578fd9
Refine duration conversion constants and checks
Copilot Dec 25, 2025
31765b7
Clarify float nanosecond conversion cast
Copilot Dec 25, 2025
56acf0a
Use checked conversion for float nanoseconds
Copilot Dec 25, 2025
514b716
Add explicit float bounds before nanosecond cast
Copilot Dec 25, 2025
4c3e73f
Streamline duration bounds validation
Copilot Dec 25, 2025
73aa693
Convert float nanoseconds with checked filtering
Copilot Dec 25, 2025
efea81d
Use explicit bounds check before casting nanoseconds
Copilot Dec 25, 2025
a781c0d
Check nanosecond sign before duration bounds
Copilot Dec 25, 2025
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Fix duration conversion rounding for os.utime 
Co-authored-by: youknowone <69878+youknowone@users.noreply.github.com>
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@youknowone
Copilot and youknowone committed Dec 25, 2025
commit da24a782e24c8b3b6bd3b5f2baa04a9922bb6a5c
33 changes: 29 additions & 4 deletions crates/vm/src/convert/try_from.rs
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Original file line number Diff line number Diff line change
Expand Up @@ -126,10 +126,7 @@ impl TryFromObject for std::time::Duration {
fn try_from_object(vm: &VirtualMachine, obj: PyObjectRef) -> PyResult<Self> {
if let Some(float) = obj.downcast_ref::<PyFloat>() {
let f = float.to_f64();
if f < 0.0 {
return Err(vm.new_value_error("negative duration"));
}
Ok(Self::from_secs_f64(f))
duration_from_f64_floor(f, vm)
} else if let Some(int) = obj.try_index_opt(vm) {
let int = int?;
let bigint = int.as_bigint();
Expand All @@ -149,3 +146,31 @@ impl TryFromObject for std::time::Duration {
}
}
}

fn duration_from_f64_floor(f: f64, vm: &VirtualMachine) -> PyResult<std::time::Duration> {
const NANOS_PER_SEC: f64 = 1_000_000_000.0;
const NANOS_PER_SEC_U128: u128 = 1_000_000_000;
const MAX_TOTAL_NANOS: u128 =
((u64::MAX as u128) * NANOS_PER_SEC_U128) + (NANOS_PER_SEC_U128 - 1);

if !f.is_finite() {
return Err(vm.new_value_error("value out of range"));
}
if f < 0.0 {
return Err(vm.new_value_error("negative duration"));
}

let total_nanos = (f * NANOS_PER_SEC).floor();
if total_nanos.is_sign_negative() {
return Err(vm.new_value_error("negative duration"));
}
if total_nanos > MAX_TOTAL_NANOS as f64 {
return Err(vm.new_value_error("value out of range"));
}

let total_nanos = total_nanos as u128;
let secs = (total_nanos / NANOS_PER_SEC_U128) as u64;
let nanos = (total_nanos % NANOS_PER_SEC_U128) as u32;

Ok(std::time::Duration::new(secs, nanos))
}