Abusing c_variadic in Rust
The article discusses the use of the c_variadic feature in Rust for handling variadic functions through C/C++ FFI interop. It details the challenges faced while implementing function calling and hooking in a cheat framework for a video game. The author shares insights on how they overcame these challenges using c_variadic, despite its limitations.
- ▪c_variadic is a recently stabilized feature in Rust that allows sending variadics through C/C++ FFI interop.
- ▪The author faced challenges in implementing function calling and hooking in a cheat framework for a video game.
- ▪Using c_variadic, the author was able to call functions with varying numbers of parameters, although it comes with risks.
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| Original publisher | DEV.to (Top) |
| Canonical URL | https://dev.to/vars1ty/abusing-cvariadic-in-rust-4hjp |
| Publication time | Sat, 30 May 2026 03:47:47 +0000 |
| Retrieval time | 2026-05-30T04:11:57.314Z |
| Last seen | 2026-05-30T04:11:57.314Z |
| Headline source | Publisher (no WeSearch rewrite) |
| Excerpt source | publisher body |
| Excerpt method | First ~120 words (~800 chars) of extracted publisher body, fair-use limited. |
| Summary | WeSearch · cerebras-chat (WeSearch summarizer) |
| Summary source text | contentText |
| Citation coverage | Summary is a WeSearch-generated derivative; primary citation is the original publisher URL. |
| Cluster | Oxs_9nonoF14 |
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| Publisher visit | Yes — open original |
| Substitutes article? | No — link-out required for full text |
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| Snippet | May a short excerpt of the publisher's text be shown? | Allowed |
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| Retrieval / RAG | May the content be exposed for third-party retrieval-augmented generation? | Not asserted |
| Model training | May the content be used to train AI models? | Not asserted |
| Commercial reuse | May the content be reused commercially? | Not permitted |
Basis: Derived from the published RSS/Atom feed. Contact: [email protected]. Reviewed: 2026-07-24.
Opening excerpt (first ~120 words) tap to expand
try { if(localStorage) { let currentUser = localStorage.getItem('current_user'); if (currentUser) { currentUser = JSON.parse(currentUser); if (currentUser.id === 3959339) { document.getElementById('article-show-container').classList.add('current-user-is-article-author'); } } } } catch (e) { console.error(e); } Tim Posted on May 30 Abusing c_variadic in Rust #rust #ffi #systems #software What is c_variadic? c_variadic is a recently stabilized feature in Rust that lets you send variadics through C/C++ FFI interop. The best example is with int printf(const char* format, ...): The ... are your variadics and allows you to pass any number of parameters.
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