libext2fs basic usage

main.c

#include <stdio.h>

#include <sys/types.h> /* required by ext2fs.h */
#include <ext2fs/ext2fs.h>

#define die(...) do {fprintf(stderr, __VA_ARGS__); exit(1);} while (0)

static int dir_iter(struct ext2_dir_entry *dirent, int offset, int blocksize, char *buf, void *userdata) {
        printf("dir_iter '%.*s', inode %u\n", dirent->name_len, dirent->name, dirent->inode);
        return 0; /* the iteration stops when the return is negative */
}

int main() {
        ext2_filsys fs;
        errcode_t err;

        /* io_manager - an abstraction for the storage device */
        err = ext2fs_open("img.e2", 0 /* EXT2_FLAG_RW */, 0, 0, unix_io_manager, &fs);
        if (err) die("ext2fs_open failed\n");

        /*
        ext2_ino_t inode;
        err = ext2fs_namei(fs, EXT2_ROOT_INO, EXT2_ROOT_INO, "/", &inode);
        if (err) die("ext2fs_namei failed\n");
        */

        err = ext2fs_dir_iterate(fs, EXT2_ROOT_INO, 0, NULL, dir_iter, NULL);
        if (err) die("ext2fs_dir_iterate failed\n");

        err = ext2fs_close(fs);
        if (err) die("ext2fs_close failed\n");
}