C Cpp Analyzer

C/C++ Analysis for Migration

Difficulty Classification

Uses tree-sitter AST analysis with regex fallback:

• Easy: Pure functions, simple arithmetic, no pointers, 30 lines → Medium):
• Pointer declarations
• Cast expressions
• malloc/calloc usage

Pattern Detection

| C Pattern | Rust Equivalent | Difficulty | |-----------|----------------|------------| | ptr + len pairs | &[T] slices | Medium | | Error code returns | Result | Easy | | NULL checks | Option | Easy | | malloc/free | Vec, Box | Medium | | char* strings | &str, String | Medium | | Manual iteration with pointers | .iter(), .enumerate() | Medium | | goto cleanup | Drop trait, ? operator | Hard | | Global mutable state | Function parameters, OnceLock | Hard | | Bit manipulation | Same ops with explicit types | Medium | | union | enum with variants | Hard | | Function pointers / callbacks | Enum dispatch (preferred) or Fn traits | Hard | | Linked lists (next/prev) | Vec (flatten) | Medium | | Type tag + union (tagged union) | enum with data variants | Medium-Hard | | Recursive data structures | enum + Box | Medium | | Coroutine via switch/case | Explicit state machine (match loop) | Hard | | Printf format strings | format!() / println!() macros | Easy-Medium | | strdup/strcpy | .to_string(), .clone() | Easy |

Size-Based Strategy

| LOC Range | Strategy | Chunking | Repair Iters | |-----------|----------|----------|--------------| | 4000 LOC — may exceed API token limits even with chunking

Migration Ceiling (learned from miniz)

Some patterns have NO safe Rust equivalent and require full algorithm redesign:

• Coroutine via switch/case (Duff's device) → explicit state machine
• Large structs with internal pointers (~300KB) → redesign needed
• Bit-level DEFLATE/INFLATE → requires exact semantic preservation
• These files need "best-effort" mode: output highest-quality version for developer to finish

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Powered by Noricum — autonomous C/C++ to Rust migration agent

Source & license

This open-source skill is cataloged on AgentStack and links to its original source — we do not rehost the code.

• Author: JuanMarchetto
• Source: JuanMarchetto/agent-skills
• License: MIT
• Homepage: https://github.com/JuanMarchetto/agent-skills

Install and usage instructions live in the source repository linked above.