libext4

A minimal, libc-free, read-only EXT4 library.

No malloc, no FILE*, no standard headers. Designed for freestanding environments (kernels, bootloaders, embedded systems).

Build

make           # → build/libext4.a
make compdb    # → compile_commands.json (for clangd/LSP)
make clean     # remove build/ and compile_commands.json

Out-of-tree build: all artifacts go to build/.

Integration

#include "ext4/ext4.h"

// caller provides block read callback
int bread(uint32 dev, uint64 block, uint8 *buf, void *priv)
{
    // read block from disk ...
    return 0;
}

struct ext4_fs fs;
ext4_mount(&fs, bread, NULL, 0);

Layout

Directory/File	Purpose
include/ext4/	Public headers (on-disk layout offsets, API types)
src/	Library source (string functions, ext4 logic)
githooks/	Git hooks (pre-commit clang-format)
Makefile	Build system with compdb generation

License

MIT