/*-
 * SPDX-License-Identifier: BSD-2-Clause
 *
 * Copyright (C) 1995, 1996, 1997 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.
 *
 * 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.
 */


#include <sys/cdefs.h>
#ifndef lint
__RCSID("$NetBSD: check.c,v 1.14 2006/06/05 16:51:18 christos Exp $");
#endif /* not lint */

#ifdef HAVE_LIBUTIL_H
#include <libutil.h>
#endif
#include <stdlib.h>
#include <string.h>
#include <stdio.h>
#include <unistd.h>
#include <fcntl.h>

#include "ext.h"
#include "fsutil.h"

int
checkfilesys(const char *fname)
{
        int dosfs;
        struct bootblock boot;
        struct fat_descriptor *fat = NULL;
        int finish_dosdirsection=0;
        int mod = 0;
        int ret = 8;
        int64_t freebytes;
        int64_t badbytes;

        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) {
                perr("Can't open `%s'", fname);
                printf("\n");
                return 8;
        }

        if (readboot(dosfs, &boot) == FSFATAL) {
                close(dosfs);
                printf("\n");
                return 8;
        }

        if (skipclean && preen && checkdirty(dosfs, &boot)) {
                printf("%s: ", fname);
                printf("FILESYSTEM CLEAN; SKIPPING CHECKS\n");
                ret = 0;
                goto out;
        }

        if (!preen)  {
                printf("** Phase 1 - Read FAT and checking connectivity\n");
        }

        mod |= readfat(dosfs, &boot, &fat);
        if (mod & FSFATAL) {
                close(dosfs);
                return 8;
        }

        if (!preen)
                printf("** Phase 2 - Checking Directories\n");

        mod |= resetDosDirSection(fat);
        finish_dosdirsection = 1;
        if (mod & FSFATAL)
                goto out;
        /* delay writing FATs */

        mod |= handleDirTree(fat);
        if (mod & FSFATAL)
                goto out;

        if (!preen)
                printf("** Phase 3 - Checking for Lost Files\n");

        mod |= checklost(fat);
        if (mod & FSFATAL)
                goto out;

        /* now write the FATs */
        if (mod & FSFATMOD) {
                if (ask(1, "Update FATs")) {
                        mod |= writefat(fat);
                        if (mod & FSFATAL)
                                goto out;
                } else
                        mod |= FSERROR;
        }

        freebytes = (int64_t)boot.NumFree * boot.ClusterSize;
        badbytes = (int64_t)boot.NumBad * boot.ClusterSize;

#ifdef HAVE_LIBUTIL_H
        char freestr[7], badstr[7];

        humanize_number(freestr, sizeof(freestr), freebytes, "",
            HN_AUTOSCALE, HN_DECIMAL | HN_IEC_PREFIXES);
        if (boot.NumBad) {
                humanize_number(badstr, sizeof(badstr), badbytes, "",
                    HN_AUTOSCALE, HN_B | HN_DECIMAL | HN_IEC_PREFIXES);

                pwarn("%d files, %sB free (%d clusters), %sB bad (%d clusters)\n",
                      boot.NumFiles, freestr, boot.NumFree,
                      badstr, boot.NumBad);
        } else {
                pwarn("%d files, %sB free (%d clusters)\n",
                      boot.NumFiles, freestr, boot.NumFree);
        }
#else
        if (boot.NumBad)
                pwarn("%d files, %jd KiB free (%d clusters), %jd KiB bad (%d clusters)\n",
                      boot.NumFiles, (intmax_t)freebytes / 1024, boot.NumFree,
                      (intmax_t)badbytes / 1024, boot.NumBad);
        else
                pwarn("%d files, %jd KiB free (%d clusters)\n",
                      boot.NumFiles, (intmax_t)freebytes / 1024, boot.NumFree);
#endif

        if (mod && (mod & FSERROR) == 0) {
                if (mod & FSDIRTY) {
                        if (ask(1, "MARK FILE SYSTEM CLEAN") == 0)
                                mod &= ~FSDIRTY;

                        if (mod & FSDIRTY) {
                                pwarn("MARKING FILE SYSTEM CLEAN\n");
                                mod |= cleardirty(fat);
                        } else {
                                pwarn("\n***** FILE SYSTEM IS LEFT MARKED AS DIRTY *****\n");
                                mod |= FSERROR; /* file system not clean */
                        }
                }
        }

        if (mod & (FSFATAL | FSERROR))
                goto out;

        ret = 0;

    out:
        if (finish_dosdirsection)
                finishDosDirSection();
        free(fat);
        close(dosfs);

        if (mod & (FSFATMOD|FSDIRMOD))
                pwarn("\n***** FILE SYSTEM WAS MODIFIED *****\n");

        return ret;
}