feat(capi): implement PyLong overflow, info, and strtol helpers by krosci · Pull Request #8935 · RustPython/RustPython

krosci · 2026-10-01T16:53:25Z

This change implements the remaining integer conversion and information APIs from longobject.h with overflow checking and standard string parsing functions, addressing part of #8156.

Summary by CodeRabbit

New Features
- Added integer conversion APIs that report whether values exceed the target range, including the direction of overflow.
- Added access to Python’s integer type information and C-style parsing for signed and unsigned integers.
- Integer conversion APIs support objects that provide integer index conversion.

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crates/capi/src/longobject.rs

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crates/capi/src/longobject.rs

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📝 Walkthrough

Walkthrough

This change adds C API functions for integer conversions with overflow reporting, access to sys.int_info, and string parsing with PyOS_strtoul and PyOS_strtol. Tests cover conversion results, overflow indicators, the info object, parsing behavior, and overflow.

Changes

Long integer C API

Layer / File(s)	Summary
Overflow-reporting conversions `crates/capi/src/longobject.rs`	Adds `PyLong_AsLongAndOverflow` and `PyLong_AsLongLongAndOverflow`. Both convert through the index protocol and report the sign of an overflow through a non-null pointer. Tests cover in-range values and positive and negative overflow.
Long info and string conversion APIs `crates/capi/src/longobject.rs`	Adds `PyLong_GetInfo` to return `sys.int_info`. Adds `PyOS_strtoul` and `PyOS_strtol` with whitespace, base and prefix handling, end-pointer updates, and overflow handling. Tests cover parsing and the returned info object.

Priority: ⬇️ Low

Estimated code review effort: 3 (Moderate) | ~20 minutes

Change: Feature

Suggested reviewers: bschoenmaeckers

Merge Risk: ⚪ Minimal · up to bbf96

The new integer APIs have no established merge-blocking issue. The unusual leading-zero parsing behavior matches CPython; merging is reasonable after normal checks.

Security Architecture Review

Security architecture risk: 🔵 Low · up to 6a134

The new string-conversion APIs delegate parsing to the platform C library, which can differ from Python-compatible parsing. This could change how native callers interpret inputs, but no security-sensitive downstream consumer or exploitable outcome has been established. The integer-conversion APIs retain the existing interpreter and ownership model.

Retained concerns

Low · security · inferred: New Python-compatible parsing exports inherit platform libc semantics without a compatibility layer. Earlier inspections record different acceptance and interpretation of unsigned signs, base-zero prefixes, and leading-zero strings. Native consumers relying on CPython parsing could therefore make different validation decisions. No downstream sensitive sink or security bypass has been demonstrated.

Security review details

Security Blast Radius

inferred — Demonstrated exposure is the native API of the embedding process. External extensions may pass untrusted strings through these exports, but their consumers, sensitive outcomes, and maximum deployment scope are not represented. The supplied name matches do not establish cross-package propagation.

Security Findings and Attack Paths

inferred — The plausible security-relevant path is an untrusted numeric string reaching a native consumer that assumes CPython parsing semantics. Different accepted syntax, values, or end positions could alter its validation decision. The parsing divergence has prior source-attributed support, but no such consumer or completed attack path is established here.

Trust Boundaries and Controls

observed — The unsafe string entrypoints trust native callers to supply valid pointers and delegate parsing to libc. They do not add an authentication or sandbox boundary. Integer conversion retains the existing owned-reference, index-result validation, and VM exception controls.

Resilience and Maintainability Implications

inferred — Owned references and centralized error translation support callback reentrancy and failure containment without a new persistent transition or recovery mechanism. Direct libc delegation, however, makes the compatibility boundary inherit platform parsing differences.

🚥 Pre-merge checks | ✅ 5

✅ Passed checks (5 passed)

Check name	Status	Explanation
Description Check	✅ Passed	Check skipped - CodeRabbit’s high-level summary is enabled.
Title check	✅ Passed	The title clearly and concisely summarizes the main changes: C API integer overflow handling, integer information, and string-conversion helpers.
Docstring Coverage	✅ Passed	Docstring coverage is 93.33% which is sufficient. The required threshold is 80.00%. Docstring coverage is scoped to functions touched by this diff. Analyzed 15 functions across 1 files.
Linked Issues check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Out of Scope Changes check	✅ Passed	Check skipped because no linked issues were found for this pull request.

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Actionable comments posted: 2

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Inline comments:
Review comments at @crates/capi/src/longobject.rs:
- Around line 278-279: In both long-conversion functions, initialize the
optional overflow output to zero before calling try_index, so a failed
conversion leaves it in the CPython-compatible state. Move the existing
success-path initialization earlier, guarding the write when overflow is null.
- Around line 386-402: Replace the direct libc calls in PyOS_strtol and
PyOS_strtoul with parsing that matches CPython’s prefix, leading-zero, sign, and
end-pointer behavior, including accepting 0o and 0b with base 0 and rejecting
signs for unsigned input. Add tests covering the specified input forms, end
pointers, and overflow.

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crates/capi/src/longobject.rs

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Assisted-by: Gemini:gemini-3.7-flash

codspeed · 2026-10-01T20:44:53Z

Merging this PR will not alter performance

✅ 62 untouched benchmarks
⏩ 4 skipped benchmarks¹

_{Comparing krosci:feat/capi-long-overflow-info (ea796f6) with main (112b7ef)}

4 benchmarks were skipped, so the baseline results were used instead. If they were deleted from the codebase, click here and archive them to remove them from the performance reports. ↩

coderabbitai Bot reviewed Oct 1, 2026

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Comment thread crates/capi/src/longobject.rs

Comment thread crates/capi/src/longobject.rs

bschoenmaeckers reviewed Oct 1, 2026

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Comment thread crates/capi/src/longobject.rs

feat(capi): implement PyLong overflow, info, and strtol helpers

ea796f6

Assisted-by: Gemini:gemini-3.7-flash

krosci force-pushed the feat/capi-long-overflow-info branch from bbf9642 to ea796f6 Compare October 1, 2026 18:25

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feat(capi): implement PyLong overflow, info, and strtol helpers - #8935

feat(capi): implement PyLong overflow, info, and strtol helpers#8935
krosci wants to merge 1 commit into
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krosci:feat/capi-long-overflow-info

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Merging this PR will not alter performance

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