310 lines
8.5 KiB
C
310 lines
8.5 KiB
C
/*
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* Copyright (c) 1995, 1996 Joerg Wunsch
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*
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* All rights reserved.
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*
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* This program is free software.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE DEVELOPERS ``AS IS'' AND ANY EXPRESS OR
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* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
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* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
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* IN NO EVENT SHALL THE DEVELOPERS BE LIABLE FOR ANY DIRECT, INDIRECT,
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* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
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* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
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* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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/*
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* Create an MS-DOS (FAT) file system.
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*
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* $Id$
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*/
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#include <sys/types.h>
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#include <sys/stat.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <time.h>
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#include <unistd.h>
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#include <memory.h>
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#include <err.h>
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#include <errno.h>
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#include <fcntl.h>
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#include "bootcode.h"
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#include "dosfs.h"
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struct descrip
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{
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/* our database key */
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unsigned kilobytes;
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/* MSDOS 3.3 BPB fields */
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u_short sectsiz;
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u_char clustsiz;
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u_short ressecs;
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u_char fatcnt;
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u_short rootsiz;
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u_short totsecs;
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u_char media;
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u_short fatsize;
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u_short trksecs;
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u_short headcnt;
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u_short hidnsec;
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/* MSDOS 4 BPB extensions */
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u_long ext_totsecs;
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u_short ext_physdrv;
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u_char ext_extboot;
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char ext_label[11];
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char ext_fsysid[8];
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};
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static struct descrip
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table[] =
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{
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/* NB: must be sorted, starting with the largest format! */
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/*
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* kilobytes
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* sec cls res fat rot tot med fsz spt hds hid
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* tot phs ebt label fsysid
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*/
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{1440,
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512, 1, 1, 2, 224, 2880, 0xf0, 9, 18, 2, 0,
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0, 0, 0, "4.4BSD ", "FAT12 "},
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{1200,
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512, 1, 1, 2, 224, 2400, 0xf9, 7, 15, 2, 0,
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0, 0, 0, "4.4BSD ", "FAT12 "},
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{ 720,
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512, 2, 1, 2, 112, 1440, 0xf9, 3, 9, 2, 0,
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0, 0, 0, "4.4BSD ", "FAT12 "},
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{ 360,
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512, 2, 1, 2, 112, 720, 0xfd, 2, 9, 2, 0,
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0, 0, 0, "4.4BSD ", "FAT12 "},
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};
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void
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usage(void)
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{
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fprintf(stderr, "usage: ");
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errx(2, "[-f kbytes] [-L label] device");
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}
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unsigned
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findformat(int fd)
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{
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struct stat sb;
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/*
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* This is a bit tricky. If the argument is a regular file, we can
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* lseek() to its end and get the size reported. If it's a device
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* however, lseeking doesn't report us any useful number. Instead,
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* we try to seek just to the end of the device and try reading a
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* block there. In the case where we've hit exactly the device
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* boundary, we get a zero read, and thus have found the size.
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* Since our knowledge of distinct formats is limited anyway, this
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* is not a big deal at all.
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*/
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if(fstat(fd, &sb) == -1)
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err(1, "Huh? Cannot fstat()"); /* Cannot happen */
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if(S_ISREG(sb.st_mode))
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{
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off_t o;
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if(lseek(fd, (off_t)0, SEEK_END) == -1 ||
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(o = lseek(fd, (off_t)0, SEEK_CUR)) == -1)
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/* Hmm, hmm. Hard luck. */
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return 0;
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return (int)(o / 1024);
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}
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else if(S_ISCHR(sb.st_mode) || S_ISBLK(sb.st_mode))
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{
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char b[512];
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int i, rv;
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struct descrip *dp;
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for(i = 0, dp = table;
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i < sizeof table / sizeof(struct descrip);
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i++, dp++)
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{
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if(lseek(fd, (off_t)(dp->kilobytes * 1024), SEEK_SET) == 1)
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/* Uh-oh, lseek() is not supposed to fail. */
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return 0;
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if((rv = read(fd, b, 512)) == 0)
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break;
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/* XXX The ENOSPC is for the bogus fd(4) driver return value. */
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if(rv == -1 && errno != EINVAL && errno != ENOSPC)
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return 0;
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/* else: continue */
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}
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if(i == sizeof table / sizeof(struct descrip))
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return 0;
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(void)lseek(fd, (off_t)0, SEEK_SET);
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return dp->kilobytes;
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}
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else
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/* Outta luck. */
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return 0;
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}
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void
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setup_boot_sector_from_template(union bootsector *bs, struct descrip *dp)
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{
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memcpy((void *)bs->raw, (void *)bootcode, 512);
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/* historical part of BPB */
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s_to_little_s(bs->bsec.sectsiz, dp->sectsiz);
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bs->bsec.clustsiz = dp->clustsiz;
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s_to_little_s(bs->bsec.ressecs, dp->ressecs);
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bs->bsec.fatcnt = dp->fatcnt;
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s_to_little_s(bs->bsec.rootsiz, dp->rootsiz);
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s_to_little_s(bs->bsec.totsecs, dp->totsecs);
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bs->bsec.media = dp->media;
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s_to_little_s(bs->bsec.fatsize, dp->fatsize);
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s_to_little_s(bs->bsec.trksecs, dp->trksecs);
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s_to_little_s(bs->bsec.headcnt, dp->headcnt);
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s_to_little_s(bs->bsec.hidnsec, dp->hidnsec);
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/* MSDOS 4 extensions */
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l_to_little_l(bs->bsec.variable_part.extended.totsecs, dp->ext_totsecs);
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s_to_little_s(bs->bsec.variable_part.extended.physdrv, dp->ext_physdrv);
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bs->bsec.variable_part.extended.extboot = dp->ext_extboot;
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/* assign a "serial number" :) */
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srandom((unsigned)time((time_t)0));
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l_to_little_l(bs->bsec.variable_part.extended.serial, random());
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memcpy((void *)bs->bsec.variable_part.extended.label,
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(void *)dp->ext_label, 11);
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memcpy((void *)bs->bsec.variable_part.extended.fsysid,
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(void *)dp->ext_fsysid, 8);
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}
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#define roundup(dst, limit) dst = (((dst) | ((limit) - 1)) & ~(limit)) + 1
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int
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main(int argc, char **argv)
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{
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union bootsector bs;
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struct descrip *dp;
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struct fat *fat;
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struct direntry *rootdir;
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struct tm *tp;
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time_t now;
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int c, i, fd, format = 0, rootdirsize;
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const char *label = 0;
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while((c = getopt(argc, argv, "f:L:")) != EOF)
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switch(c)
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{
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case 'f':
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format = atoi(optarg);
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break;
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case 'L':
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label = optarg;
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break;
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case '?':
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default:
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usage();
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}
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argc -= optind;
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argv += optind;
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if(argc != 1)
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usage();
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if((fd = open(argv[0], O_RDWR|O_EXCL, 0)) == -1)
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err(1, "open(%s)", argv[0]);
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if(format == 0)
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{
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/*
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* No format specified, try to figure it out.
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*/
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if((format = findformat(fd)) == 0)
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errx(1, "cannot determine size, must use -f format");
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}
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for(i = 0, dp = table; i < sizeof table / sizeof(struct descrip); i++, dp++)
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if(dp->kilobytes == format)
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break;
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if(i == sizeof table / sizeof(struct descrip))
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errx(1, "cannot find format description for %d KB", format);
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/* prepare and write the boot sector */
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setup_boot_sector_from_template(&bs, dp);
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/* if we've got an explicit label, use it */
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if(label)
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strncpy(bs.bsec.variable_part.extended.label, label, 11);
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if(write(fd, (char *)bs.raw, sizeof bs) != sizeof bs)
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err(1, "boot sector write()");
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/* now, go on with the FATs */
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if((fat = (struct fat *)malloc(dp->sectsiz * dp->fatsize)) == 0)
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abort();
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memset((void *)fat, 0, dp->sectsiz * dp->fatsize);
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fat->media = dp->media;
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fat->padded = 0xff;
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fat->contents[0] = 0xff;
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if(dp->totsecs > 20740 || (dp->totsecs == 0 && dp->ext_totsecs > 20740))
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/* 16-bit FAT */
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fat->contents[1] = 0xff;
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for(i = 0; i < dp->fatcnt; i++)
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if(write(fd, (char *)fat, dp->sectsiz * dp->fatsize)
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!= dp->sectsiz * dp->fatsize)
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err(1, "FAT write()");
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free((void *)fat);
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/* finally, build the root dir */
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rootdirsize = dp->rootsiz * sizeof(struct direntry);
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roundup(rootdirsize, dp->clustsiz * dp->sectsiz);
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if((rootdir = (struct direntry *)malloc(rootdirsize)) == 0)
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abort();
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memset((void *)fat, 0, rootdirsize);
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/* set up a volume label inside the root dir :) */
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if(label)
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strncpy(rootdir[0].name, label, 11);
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else
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memcpy(rootdir[0].name, dp->ext_label, 11);
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rootdir[0].attr = FA_VOLLABEL;
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now = time((time_t)0);
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tp = localtime(&now);
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rootdir[0].fdate.time[0] = tp->tm_sec / 2;
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rootdir[0].fdate.time[0] |= (tp->tm_min & 7) << 5;
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rootdir[0].fdate.time[1] = ((tp->tm_min >> 3) & 7);
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rootdir[0].fdate.time[1] |= tp->tm_hour << 3;
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rootdir[0].fdate.date[0] = tp->tm_mday;
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rootdir[0].fdate.date[0] |= ((tp->tm_mon + 1) & 7) << 5;
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rootdir[0].fdate.date[1] = ((tp->tm_mon + 1) >> 3) & 1;
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rootdir[0].fdate.date[1] |= (tp->tm_year - 80) << 1;
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if(write(fd, (char *)rootdir, rootdirsize) != rootdirsize)
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err(1, "root dir write()");
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(void)close(fd);
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return 0;
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}
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