stat.c

/*
 * Copyright (c) 2019 Dave Vasilevsky <dave@vasilevsky.ca>
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 *
 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR(S) ``AS IS'' AND ANY EXPRESS OR
 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
 * IN NO EVENT SHALL THE AUTHOR(S) BE LIABLE FOR ANY DIRECT, INDIRECT,
 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 */
#include "stat.h"
#include "nonstd.h"

#include <string.h>

sqfs_err sqfs_stat(sqfs *fs, sqfs_inode *inode, struct stat *st) {
	sqfs_err err = SQFS_OK;
	uid_t id;
	
	memset(st, 0, sizeof(*st));
	st->st_mode = inode->base.mode;
	st->st_nlink = inode->nlink;
	st->st_mtime = st->st_ctime = st->st_atime = inode->base.mtime;
	
	if (S_ISREG(st->st_mode)) {
		/* FIXME: do symlinks, dirs, etc have a size? */
		st->st_size = inode->xtra.reg.file_size;
		st->st_blocks = st->st_size / 512;
	} else if (S_ISBLK(st->st_mode) || S_ISCHR(st->st_mode)) {
		st->st_rdev = sqfs_makedev(inode->xtra.dev.major,
			inode->xtra.dev.minor);
	} else if (S_ISLNK(st->st_mode)) {
		st->st_size = inode->xtra.symlink_size;
	}
	
	st->st_blksize = fs->sb.block_size; /* seriously? */
	
	if (fs->uid > 0) {
		st->st_uid = fs->uid;
	} else {
		err = sqfs_id_get(fs, inode->base.uid, &id);
		if (err)
			return err;
		st->st_uid = id;
	}
	if (fs->gid > 0) {
		st->st_gid = fs->gid;
	} else {
		err = sqfs_id_get(fs, inode->base.guid, &id);
		st->st_gid = id;
		if (err)
			return err;
	}
	
	return SQFS_OK;
}