readdir.c

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#include <core/system.h>
#include <fs/vfs.h>

ssize_t vfs_readdir(struct vnode *dir, off_t off, struct dirent *dirent)
{
    vfs_log(LOG_DEBUG, "vfs_readdir(dir=%p, off=%d, dirent=%p)\n", dir, off, dirent);
 
    /* invalid request */
    if (!dir || !dir->fs)
        return -EINVAL;
 
    if (!S_ISDIR(dir->mode))
        return -ENOTDIR;
 
    /* the filesystem doesn't support it */
    if (!dir->fs->vops.readdir)
        return -ENOSYS;
 
    return dir->fs->vops.readdir(dir, off, dirent);
}

int vfs_finddir(struct vnode *dir, const char *name, struct dirent *dirent)
{
    vfs_log(LOG_DEBUG, "vfs_finddir(dir=%p, name=%s, dirent=%p)\n", dir, name, dirent);
 
    if (!dir || !dir->fs)
        return -EINVAL;
 
    if (!S_ISDIR(dir->mode))
        return -ENOTDIR;
 
    if (!dir->fs->vops.finddir)
        return -ENOSYS;
 
    return dir->fs->vops.finddir(dir, name, dirent);
}

int vfs_dir_empty(struct vnode *dir)
{
    struct dirent dirent;
    off_t off = 0;
    ssize_t ret;
 
    while ((ret = vfs_readdir(dir, off, &dirent)) > 0) {
        if (strcmp(dirent.d_name, ".") && strcmp(dirent.d_name, ".."))
            return 0;
 
        off += ret;
    }
 
    return ret == 0;
}