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libakstdlib/AGENTS.md
Andrew Kesterson 11c04923f8
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Repository Guidelines

Project Structure & Module Organization

libakstdlib is a C shared library that wraps libc calls and small data structures in libakerror error contexts. Public API declarations live in include/akstdlib.h; implementation lives in src/stdlib.c. Tests are one-file CTest executables under tests/test_<name>.c, with shared test helpers in tests/aksl_capture.h. CMake package templates are in cmake/ and akstdlib.pc.in. The vendored dependency is deps/libakerror; update it as a submodule rather than editing generated files under build/ or build-asan/.

Build, Test, and Development Commands

Initialize dependencies before a fresh build:

git submodule update --init --recursive
cmake -S . -B build
cmake --build build

Run the normal suite with ctest --test-dir build --output-on-failure. Use the instrumented build for memory and undefined-behavior checks:

cmake -S . -B build-asan -DAKSL_SANITIZE=ON
cmake --build build-asan
ctest --test-dir build-asan --output-on-failure

Run cmake --build build --target mutation only when you need the slower mutation harness. rebuild.sh installs to /home/andrew/local and removes the local build directory, so treat it as a local convenience script.

Coding Style & Naming Conventions

Use C with 4-space indentation; existing files sometimes use tabs for continued statements, so match the surrounding block. Public symbols use the aksl_ prefix, structs use aksl_<Name>, and tests use test_<feature>.c plus static test_<case> functions. Preserve the akerr_ErrorContext AKERR_NOIGNORE * return convention and the PREPARE_ERROR / FAIL_* / SUCCEED_RETURN pattern.

Testing Guidelines

Add a new test by creating tests/test_mything.c and adding mything to the right list in CMakeLists.txt. AKSL_TESTS must exit zero. AKSL_WILL_FAIL_TESTS are deliberate abort/contract tests. AKSL_KNOWN_FAILING_TESTS assert documented defects from TODO.md; when one starts unexpectedly passing, move it into AKSL_TESTS with the fix.

Commit & Pull Request Guidelines

Recent commits use short imperative summaries, for example Add memory wrapper tests and Make error-status assertions authoritative. Keep commits focused and include tests with behavior changes. Pull requests should describe the changed API or behavior, list the CTest/sanitizer/mutation commands run, and link the relevant TODO.md item or issue when fixing a known defect.

Agent-Specific Instructions

Do not modify generated build trees, profiling artifacts, or untracked scratch files unless explicitly asked. Prefer small, test-backed changes and update README.md or TODO.md when changing documented workflows or known failures.