libfyaml-0.9.4

[Bruce Dubbs]

New point version.

[Joe Locash]

## [0.9.4] - 2026-02-03

### Major: Full Windows Support

This release adds **full native Windows support**. libfyaml now builds and runs natively on Windows with MSVC, clang-cl, and Clang compilers.

**Native Windows builds:**
- Full support for building on Windows using MSVC, clang-cl, or GCC
- Works with Visual Studio, VSCode, and other Windows development tools
- All tests pass on Windows

**Cross-compilation from Linux:**
- Support for msvc-wine to install MSVC redistributables on Linux
- Compile using `cl.exe` via Wine
- Compile using `clang-cl` without Wine
- Compile using Clang cross-compilation triplet

### Major: Comment Support Now Stable

Comment parsing and emission has been moved out of experimental status. Comments can now be reliably preserved and manipulated through the API.

### Added

- `fy_node_set_style()`: Set the style of a node (block, flow, plain, etc.) - Fixes #78
- `fy_token_set_comment()`: Attach comments to tokens programmatically
- `fy_event_to_string()`: Convert events to string representation
- `fy_diag_get_collect_errors()`: Query if error collection is enabled
- `fy_atom_lines_containing()`: Get lines containing an atom (for diagnostics)
- `fy_memstream`: Portable `open_memstream` alternative for cross-platform support
- CMake-based CI workflow with improved matrix coverage
- Emscripten platform detection for `endian.h`

### Changed

- libclang now defaults to OFF (will be enabled when reflection features are ready)
- Document start token is now preserved (may contain comments)
- Walk methods now handle error paths more systematically
- Removed non-existent experimental function declarations from `libfyaml.h`

### Fixed

- **#193**: Token creation now properly clears memory to avoid undefined behavior on invalid input
- **#186**: Reference loop nesting now respected when checking link validity
- **#185**: Fixed crash when setting document root to NULL; also fixed input size clamping for corrupted input
- **#184**: Walk memory leak fix with improved debugging infrastructure
- **#183, #191**: Error out early on `FYECF_EXTENDED_CFG` with helper emit methods (prevents crash)
- **#182**: Walk expression unref bug fix with debug infrastructure
- **#181**: Walk double-free on node delete
- **#178, #177**: Walk methods now handle error paths systematically (recursive alias resolution)
- **#176**: Off-by-one error in `fy_accel_grow`
- **#175**: Parser crash on corrupted UTF-8 at end of file
- **#174**: Superfluous document end marker with explicit version/tag directives
- **#173, #172**: Depth limit for node copy (prevents stack overflow under fuzzing)
- **#143**: Document root now correctly marked as attached
- Emit state now properly reset at end of document (fixes multi-document stream markers)
- Flow quoting error on ANY style (test was backwards)
- Empty file `fdopen` issue on some platforms
- Empty stream `realloc(0)` undefined behavior
- Removed jarring notice when alias is declared multiple times (valid YAML)

### Platform Support

**Supported platforms**: Linux, macOS, FreeBSD, OpenBSD, NetBSD, and **Windows**.

**Windows-specific:**
- Full native MSVC support (32-bit and 64-bit)
- clang-cl and Clang cross-compilation support
- msvc-wine support for Linux-based Windows cross-compilation
- Proper CRLF (DOS line ending) handling
- Fixed 32-bit MSVC intrinsics (`_BitScanForward64`, `_BitScanReverse64`, `__popcnt64`)

**Portability fixes:**
- Fixed void pointer arithmetic (GCC extension) for strict C compliance
- Fixed GCC ternary operator extension (`x ? : y` -> `x ? x : y`)
- Fixed `\e` escape sequence (GCC/clang extension) -> `\x1b`
- Fixed enum comparison warnings across platforms
- Align mremap initial size to page boundary (fixes BSD crashes)

**macOS:**
- Fixed ASAN support (requires `-fsanitize=address` at link time)
- Added extra ASAN flags for Apple's clang (alloca poisoning disabled)

**CI/Build:**
- New CMake-based GitHub Actions workflow
- Improved build matrix coverage
- Fixed distcheck breakage

### Internal

- Walk expression debug infrastructure for easier debugging
- Portable `fy_memstream` wrapper for `open_memstream`
- Use `fy_align_alloc/free` wrappers in allocator
- Fixed allocator `get_caps` return type (enum, not int)
- Atomic counter function instead of macro
- General warning cleanup pass

### Statistics

- 58 commits since v0.9.3
- 18 bug fix issues closed
- Full Windows platform support added

Fixed at 8912ea41bc.