Guides C code implementation, review, and C23 migration against the project's declared -std= baseline.
npx skills add https://github.com/kohdice/dotfiles --skill c-idioms-kohdice
Please help me install this Agent Skill. Skill: c-idioms Source: https://github.com/kohdice/dotfiles/tree/main/config/agents/skills/c-idioms Command: npx skills add https://github.com/kohdice/dotfiles --skill c-idioms-kohdice
-std= baseline first, then gates every recommendation, refactoring, and review finding against the correct ISO C version up to C23. ## Core Features & Use Cases - Baseline-aware code generation: Detects the target standard from Makefiles, CMakeLists.txt, meson.build, and other build files, then emits only conforming code with a mandatory baseline statement and self-check. - Version-tagged review reports: Produces structured findings tiered by severity (removed constructs, obsolescent constructs, modernization options) with file:line references, official WG14 citations, and ripple notes for non-drop-in replacements. - C23 migration guidance: Flags K&R definitions, trigraphs, ATOMIC_VAR_INIT, realloc(ptr, 0), and other removed constructs, while labeling gated replacements like nullptr, constexpr, <stdckdint.h>, and <stdbit.h> with their required C version. - Use Case: When reviewing a legacy C11 codebase, the Skill identifies _Noreturn and DECIMAL_DIG as obsolescent in C23, cites the adopting WG14 proposals, and suggests [[noreturn]] and FLT_DECIMAL_DIG as labeled migration options without breaking the current baseline. ## Quick Start Ask the AI to review or write C code in this project using the c-idioms skill so it resolves the -std= baseline and applies version-correct recommendations.High-intent search queries and answers about installing and using this skill.
First resolve the project's -std= baseline from build files, then replace removed constructs like K&R function definitions, trigraphs, and ATOMIC_VAR_INIT with their C23 equivalents. Verify compiler and library support using GCC and Clang official feature tables before adopting specific C23 features.
Determine the target standard from -std= flags in Makefile, CMakeLists.txt, or meson.build, then check code against version-tagged catalogs of removed and obsolescent constructs. Report findings with severity tiers, file:line references, and the standard version that changed each construct.
C23 removed K&R function definitions, trigraphs, and ATOMIC_VAR_INIT, changed empty parentheses to mean (void), and made realloc(ptr, 0) undefined behavior. Two's complement representation is now mandated, making sign-magnitude fallback code dead.
No. Accepting the -std=c23 flag does not guarantee support for every C23 language feature or library facility. Check the official GCC and Clang C status pages for the specific features you plan to use, and state implementation limits in your output.
nullptr (C23) matters most in sentinel and variadic contexts where type safety affects correctness; ordinary null checks do not require it. NULL remains valid and is not obsolescent, so treat the replacement as a labeled modernization option gated on a C23 baseline.
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