/*	$NetBSD: check.c,v 1.1 1996/05/14 17:39:29 ws Exp $	*/

/*
 * Copyright (C) 1995, 1996 Wolfgang Solfrank
 * Copyright (c) 1995 Martin Husemann
 *
 * 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.
 * 3. All advertising materials mentioning features or use of this software
 *    must display the following acknowledgement:
 *	This product includes software developed by Martin Husemann
 *	and Wolfgang Solfrank.
 * 4. Neither the name of the University nor the names of its contributors
 *    may be used to endorse or promote products derived from this software
 *    without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE AUTHORS ``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 AUTHORS 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.
 */


#ifndef lint
static char rcsid[] = "$NetBSD: check.c,v 1.1 1996/05/14 17:39:29 ws Exp $";
#endif /* not lint */

#include <stdlib.h>
#include <string.h>
#include <ctype.h>
#include <stdio.h>
#include <unistd.h>
#include <fcntl.h>

#include "ext.h"

int
checkfilesys(fname)
	const char *fname;
{
	int dosfs;
	struct dosDirEntry *rootDir;
	struct bootblock boot;
	struct fatEntry * fat = NULL;
	int i;
	int mod = 0;

	rdonly = alwaysno;
	if (!preen)
		printf("** %s", fname);

	dosfs = open(fname, rdonly ? O_RDONLY : O_RDWR, 0);
	if (dosfs < 0 && !rdonly) {
		dosfs = open(fname, O_RDONLY, 0);
		if (dosfs >= 0)
			pwarn(" (NO WRITE)\n");
		else if (!preen)
			printf("\n");
		rdonly = 1;
	} else if (!preen)
		printf("\n");
	
	if (dosfs < 0) {
		perror("Can't open");
		return 8;
	}

	if (readboot(dosfs, &boot) != FSOK) {
		close(dosfs);
		return 8;
	}

	if (!preen)
		printf("** Phase 1 - Read and Compare FATs\n");
	
	for (i = 0; i < boot.FATs; i++) {
		struct fatEntry *currentFat;

		mod |= readfat(dosfs, &boot, i, &currentFat);

		if (mod&FSFATAL) {
			close(dosfs);
			return 8;
		}
			
		if (fat == NULL)
			fat  = currentFat;
		else {
			mod |= comparefat(&boot, fat, currentFat, i + 1);
			if (mod&FSFATAL) {
				close(dosfs);
				return 8;
			}
		}
	}

	if (!preen)
		printf("** Phase 2 - Check Cluster Chains\n");
	
	mod |= checkfat(&boot, fat);
	if (mod&FSFATAL) {
		close(dosfs);
		return 8;
	}
		
	if (mod&FSFATMOD)
		mod |= writefat(dosfs, &boot, fat); /* delay writing fats?	XXX */
	if (mod&FSFATAL) {
		close(dosfs);
		return 8;
	}

	if (!preen)
		printf("** Phase 3 - Checking Directories\n");
	
	rootDir = malloc(sizeof(struct dosDirEntry));
	memset(rootDir, 0, sizeof(struct dosDirEntry));
	rootDir->fullpath = strdup("/");
	if (resetDosDirSection(&boot)&FSFATAL) {
		close(dosfs);
		return 8;
	}
	
	mod = readDosDirSection(dosfs, &boot, fat, rootDir);
	if (mod&FSFATAL) {
		close(dosfs);
		return 8;
	}
	
	if (mod&FSFATMOD)
		mod |= writefat(dosfs, &boot, fat); /* delay writing fats?	XXX */
	if (mod&FSFATAL) {
		close(dosfs);
		return 8;
	}
	
	/*
	 * process the directory todo list
	 */
	while (pendingDirectories) {
		struct dosDirEntry *dir = pendingDirectories->dir;
		struct dirTodoNode *n = pendingDirectories->next;

		/*
		 * remove TODO entry now, the list might change during
		 * directory reads
		 */
		free(pendingDirectories);
		pendingDirectories = n;

		/*
		 * handle subdirectory
		 */
		mod |= readDosDirSection(dosfs, &boot, fat, dir);
		if (mod&FSFATAL) {
			close(dosfs);
			return 8;
		}
		if (mod&FSFATMOD)
			mod |= writefat(dosfs, &boot, fat); /* delay writing fats? XXX */
		if (mod&FSFATAL) {
			close(dosfs);
			return 8;
		}
	}
	finishDosDirSection();

	if (!preen)
		printf("** Phase 4 - Checking for Lost Files\n");

	mod |= checklost(dosfs, &boot, fat, rootDir);
	
	close(dosfs);
	pwarn("%d files, %d free (%d clusters)\n",
	      boot.NumFiles, boot.NumFree * boot.ClusterSize / 1024,
	      boot.NumFree);
	if (mod&(FSFATAL|FSERROR))
		return 8;
	if (mod) {
		pwarn("\n***** FILE SYSTEM WAS MODIFIED *****\n");
		return 4;
	}
	return 0;
}