2 * Copyright (c) 1998 Robert Nordier
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
8 * 1. Redistributions of source code must retain the above copyright
9 * notice, this list of conditions and the following disclaimer.
10 * 2. Redistributions in binary form must reproduce the above copyright
11 * notice, this list of conditions and the following disclaimer in
12 * the documentation and/or other materials provided with the
15 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR(S) ``AS IS'' AND ANY EXPRESS
16 * OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
17 * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
18 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR(S) BE LIABLE FOR ANY
19 * DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
20 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE
21 * GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
22 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER
23 * IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
24 * OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN
25 * IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
29 static const char rcsid[] =
33 #include <sys/param.h>
34 #include <sys/fdcio.h>
36 #include <sys/disklabel.h>
37 #include <sys/mount.h>
53 #define MAXU16 0xffff /* maximum unsigned 16-bit quantity */
54 #define BPN 4 /* bits per nibble */
55 #define NPB 2 /* nibbles per byte */
57 #define DOSMAGIC 0xaa55 /* DOS magic number */
58 #define MINBPS 512 /* minimum bytes per sector */
59 #define MAXSPC 128 /* maximum sectors per cluster */
60 #define MAXNFT 16 /* maximum number of FATs */
61 #define DEFBLK 4096 /* default block size */
62 #define DEFBLK16 2048 /* default block size FAT16 */
63 #define DEFRDE 512 /* default root directory entries */
64 #define RESFTE 2 /* reserved FAT entries */
65 #define MINCLS12 1 /* minimum FAT12 clusters */
66 #define MINCLS16 0x1000 /* minimum FAT16 clusters */
67 #define MINCLS32 2 /* minimum FAT32 clusters */
68 #define MAXCLS12 0xfed /* maximum FAT12 clusters */
69 #define MAXCLS16 0xfff5 /* maximum FAT16 clusters */
70 #define MAXCLS32 0xffffff5 /* maximum FAT32 clusters */
72 #define mincls(fat) ((fat) == 12 ? MINCLS12 : \
73 (fat) == 16 ? MINCLS16 : \
76 #define maxcls(fat) ((fat) == 12 ? MAXCLS12 : \
77 (fat) == 16 ? MAXCLS16 : \
84 (p)[0] = (u_int8_t)(x), \
85 (p)[1] = (u_int8_t)((x) >> 010)
88 (p)[0] = (u_int8_t)(x), \
89 (p)[1] = (u_int8_t)((x) >> 010), \
90 (p)[2] = (u_int8_t)((x) >> 020), \
91 (p)[3] = (u_int8_t)((x) >> 030)
93 #define argto1(arg, lo, msg) argtou(arg, lo, 0xff, msg)
94 #define argto2(arg, lo, msg) argtou(arg, lo, 0xffff, msg)
95 #define argto4(arg, lo, msg) argtou(arg, lo, 0xffffffff, msg)
96 #define argtox(arg, lo, msg) argtou(arg, lo, UINT_MAX, msg)
99 u_int8_t jmp[3]; /* bootstrap entry point */
100 u_int8_t oem[8]; /* OEM name and version */
104 u_int8_t bps[2]; /* bytes per sector */
105 u_int8_t spc; /* sectors per cluster */
106 u_int8_t res[2]; /* reserved sectors */
107 u_int8_t nft; /* number of FATs */
108 u_int8_t rde[2]; /* root directory entries */
109 u_int8_t sec[2]; /* total sectors */
110 u_int8_t mid; /* media descriptor */
111 u_int8_t spf[2]; /* sectors per FAT */
112 u_int8_t spt[2]; /* sectors per track */
113 u_int8_t hds[2]; /* drive heads */
114 u_int8_t hid[4]; /* hidden sectors */
115 u_int8_t bsec[4]; /* big total sectors */
119 u_int8_t bspf[4]; /* big sectors per FAT */
120 u_int8_t xflg[2]; /* FAT control flags */
121 u_int8_t vers[2]; /* file system version */
122 u_int8_t rdcl[4]; /* root directory start cluster */
123 u_int8_t infs[2]; /* file system info sector */
124 u_int8_t bkbs[2]; /* backup boot sector */
125 u_int8_t rsvd[12]; /* reserved */
129 u_int8_t drv; /* drive number */
130 u_int8_t rsvd; /* reserved */
131 u_int8_t sig; /* extended boot signature */
132 u_int8_t volid[4]; /* volume ID number */
133 u_int8_t label[11]; /* volume label */
134 u_int8_t type[8]; /* file system type */
138 u_int8_t namext[11]; /* name and extension */
139 u_int8_t attr; /* attributes */
140 u_int8_t rsvd[10]; /* reserved */
141 u_int8_t time[2]; /* creation time */
142 u_int8_t date[2]; /* creation date */
143 u_int8_t clus[2]; /* starting cluster */
144 u_int8_t size[4]; /* size */
148 u_int bps; /* bytes per sector */
149 u_int spc; /* sectors per cluster */
150 u_int res; /* reserved sectors */
151 u_int nft; /* number of FATs */
152 u_int rde; /* root directory entries */
153 u_int sec; /* total sectors */
154 u_int mid; /* media descriptor */
155 u_int spf; /* sectors per FAT */
156 u_int spt; /* sectors per track */
157 u_int hds; /* drive heads */
158 u_int hid; /* hidden sectors */
159 u_int bsec; /* big total sectors */
160 u_int bspf; /* big sectors per FAT */
161 u_int rdcl; /* root directory start cluster */
162 u_int infs; /* file system info sector */
163 u_int bkbs; /* backup boot sector */
166 #define BPBGAP 0, 0, 0, 0, 0, 0
172 {"160", {512, 1, 1, 2, 64, 320, 0xfe, 1, 8, 1, BPBGAP}},
173 {"180", {512, 1, 1, 2, 64, 360, 0xfc, 2, 9, 1, BPBGAP}},
174 {"320", {512, 2, 1, 2, 112, 640, 0xff, 1, 8, 2, BPBGAP}},
175 {"360", {512, 2, 1, 2, 112, 720, 0xfd, 2, 9, 2, BPBGAP}},
176 {"640", {512, 2, 1, 2, 112, 1280, 0xfb, 2, 8, 2, BPBGAP}},
177 {"720", {512, 2, 1, 2, 112, 1440, 0xf9, 3, 9, 2, BPBGAP}},
178 {"1200", {512, 1, 1, 2, 224, 2400, 0xf9, 7, 15, 2, BPBGAP}},
179 {"1232", {1024,1, 1, 2, 192, 1232, 0xfe, 2, 8, 2, BPBGAP}},
180 {"1440", {512, 1, 1, 2, 224, 2880, 0xf0, 9, 18, 2, BPBGAP}},
181 {"2880", {512, 2, 1, 2, 240, 5760, 0xf0, 9, 36, 2, BPBGAP}}
184 static const u_int8_t bootcode[] = {
186 0x31, 0xc0, /* xor ax,ax */
187 0x8e, 0xd0, /* mov ss,ax */
188 0xbc, 0x00, 0x7c, /* mov sp,7c00h */
190 0x8e, 0xd8, /* mov ds,ax */
191 0xe8, 0x00, 0x00, /* call $ + 3 */
193 0x83, 0xc6, 0x19, /* add si,+19h */
194 0xbb, 0x07, 0x00, /* mov bx,0007h */
197 0x84, 0xc0, /* test al,al */
198 0x74, 0x06, /* jz $ + 8 */
199 0xb4, 0x0e, /* mov ah,0eh */
200 0xcd, 0x10, /* int 10h */
201 0xeb, 0xf5, /* jmp $ - 9 */
202 0x30, 0xe4, /* xor ah,ah */
203 0xcd, 0x16, /* int 16h */
204 0xcd, 0x19, /* int 19h */
206 'N', 'o', 'n', '-', 's', 'y', 's', 't',
207 'e', 'm', ' ', 'd', 'i', 's', 'k',
209 'P', 'r', 'e', 's', 's', ' ', 'a', 'n',
210 'y', ' ', 'k', 'e', 'y', ' ', 't', 'o',
211 ' ', 'r', 'e', 'b', 'o', 'o', 't',
216 static void check_mounted(const char *, mode_t);
217 static void getstdfmt(const char *, struct bpb *);
218 static void getdiskinfo(int, const char *, const char *, int,
220 static void print_bpb(struct bpb *);
221 static u_int ckgeom(const char *, u_int, const char *);
222 static u_int argtou(const char *, u_int, u_int, const char *);
223 static off_t argtooff(const char *, const char *);
224 static int oklabel(const char *);
225 static void mklabel(u_int8_t *, const char *);
226 static void setstr(u_int8_t *, const char *, size_t);
227 static void usage(void);
230 * Construct a FAT12, FAT16, or FAT32 file system.
233 main(int argc, char *argv[])
235 static const char opts[] = "@:NB:C:F:I:L:O:S:a:b:c:e:f:h:i:k:m:n:o:r:s:u:";
236 const char *opt_B = NULL, *opt_L = NULL, *opt_O = NULL, *opt_f = NULL;
237 u_int opt_F = 0, opt_I = 0, opt_S = 0, opt_a = 0, opt_b = 0, opt_c = 0;
238 u_int opt_e = 0, opt_h = 0, opt_i = 0, opt_k = 0, opt_m = 0, opt_n = 0;
239 u_int opt_o = 0, opt_r = 0, opt_s = 0, opt_u = 0;
241 int Iflag = 0, mflag = 0, oflag = 0;
242 char buf[MAXPATHLEN];
249 struct bsxbpb *bsxbpb;
253 const char *fname, *dtype, *bname;
256 u_int fat, bss, rds, cls, dir, lsn, x, x1, x2;
258 off_t opt_create = 0, opt_ofs = 0;
260 while ((ch = getopt(argc, argv, opts)) != -1)
263 opt_ofs = argtooff(optarg, "offset");
272 opt_create = argtooff(optarg, "create size");
275 if (strcmp(optarg, "12") &&
276 strcmp(optarg, "16") &&
277 strcmp(optarg, "32"))
278 errx(1, "%s: bad FAT type", optarg);
279 opt_F = atoi(optarg);
282 opt_I = argto4(optarg, 0, "volume ID");
286 if (!oklabel(optarg))
287 errx(1, "%s: bad volume label", optarg);
291 if (strlen(optarg) > 8)
292 errx(1, "%s: bad OEM string", optarg);
296 opt_S = argto2(optarg, 1, "bytes/sector");
299 opt_a = argto4(optarg, 1, "sectors/FAT");
302 opt_b = argtox(optarg, 1, "block size");
306 opt_c = argto1(optarg, 1, "sectors/cluster");
310 opt_e = argto2(optarg, 1, "directory entries");
316 opt_h = argto2(optarg, 1, "drive heads");
319 opt_i = argto2(optarg, 1, "info sector");
322 opt_k = argto2(optarg, 1, "backup sector");
325 opt_m = argto1(optarg, 0, "media descriptor");
329 opt_n = argto1(optarg, 1, "number of FATs");
332 opt_o = argto4(optarg, 0, "hidden sectors");
336 opt_r = argto2(optarg, 1, "reserved sectors");
339 opt_s = argto4(optarg, 1, "file system size");
342 opt_u = argto2(optarg, 1, "sectors/track");
349 if (argc < 1 || argc > 2)
352 if (!opt_create && !strchr(fname, '/')) {
353 snprintf(buf, sizeof(buf), "%s%s", _PATH_DEV, fname);
354 if (!(fname = strdup(buf)))
360 errx(1, "create (-C) is incompatible with -N");
361 fd = open(fname, O_RDWR | O_CREAT | O_TRUNC, 0644);
363 errx(1, "failed to create %s", fname);
364 if (ftruncate(fd, opt_create))
365 errx(1, "failed to initialize %jd bytes", (intmax_t)opt_create);
366 } else if ((fd = open(fname, opt_N ? O_RDONLY : O_RDWR)) == -1)
371 if (!S_ISREG(sb.st_mode))
372 warnx("warning, %s is not a regular file", fname);
374 if (!S_ISCHR(sb.st_mode))
375 warnx("warning, %s is not a character device", fname);
378 check_mounted(fname, sb.st_mode);
379 if (opt_ofs && opt_ofs != lseek(fd, opt_ofs, SEEK_SET))
380 errx(1, "cannot seek to %jd", (intmax_t)opt_ofs);
381 memset(&bpb, 0, sizeof(bpb));
383 getstdfmt(opt_f, &bpb);
399 if (!(opt_f || (opt_h && opt_u && opt_S && opt_s && oflag))) {
401 getdiskinfo(fd, fname, dtype, oflag, &bpb);
402 bpb.bsec -= (opt_ofs / bpb.bps);
403 delta = bpb.bsec % bpb.spt;
405 warnx("trim %d sectors to adjust to a multiple of %d",
406 (int)delta, bpb.spt);
409 if (bpb.spc == 0) { /* set defaults */
410 if (bpb.bsec <= 6000) /* about 3MB -> 512 bytes */
412 else if (bpb.bsec <= (1<<17)) /* 64M -> 4k */
414 else if (bpb.bsec <= (1<<19)) /* 256M -> 8k */
416 else if (bpb.bsec <= (1<<21)) /* 1G -> 16k */
419 bpb.spc = 64; /* otherwise 32k */
422 if (!powerof2(bpb.bps))
423 errx(1, "bytes/sector (%u) is not a power of 2", bpb.bps);
424 if (bpb.bps < MINBPS)
425 errx(1, "bytes/sector (%u) is too small; minimum is %u",
427 if (!(fat = opt_F)) {
430 else if (!opt_e && (opt_i || opt_k))
433 if ((fat == 32 && opt_e) || (fat != 32 && (opt_i || opt_k)))
434 errx(1, "-%c is not a legal FAT%s option",
435 fat == 32 ? 'e' : opt_i ? 'i' : 'k',
436 fat == 32 ? "32" : "12/16");
437 if (opt_f && fat == 32)
440 if (!powerof2(opt_b))
441 errx(1, "block size (%u) is not a power of 2", opt_b);
443 errx(1, "block size (%u) is too small; minimum is %u",
445 if (opt_b > bpb.bps * MAXSPC)
446 errx(1, "block size (%u) is too large; maximum is %u",
447 opt_b, bpb.bps * MAXSPC);
448 bpb.spc = opt_b / bpb.bps;
451 if (!powerof2(opt_c))
452 errx(1, "sectors/cluster (%u) is not a power of 2", opt_c);
459 errx(1, "number of FATs (%u) is too large; maximum is %u",
467 errx(1, "illegal media descriptor (%#x)", opt_m);
481 if (!strchr(bname, '/')) {
482 snprintf(buf, sizeof(buf), "/boot/%s", bname);
483 if (!(bname = strdup(buf)))
486 if ((fd1 = open(bname, O_RDONLY)) == -1 || fstat(fd1, &sb))
488 if (!S_ISREG(sb.st_mode) || sb.st_size % bpb.bps ||
489 sb.st_size < bpb.bps || sb.st_size > bpb.bps * MAXU16)
490 errx(1, "%s: inappropriate file type or format", bname);
491 bss = sb.st_size / bpb.bps;
496 if (bpb.bsec < (bpb.res ? bpb.res : bss) +
497 howmany((RESFTE + (bpb.spc ? MINCLS16 : MAXCLS12 + 1)) *
498 ((bpb.spc ? 16 : 12) / BPN), bpb.bps * NPB) *
500 howmany(bpb.rde ? bpb.rde : DEFRDE,
501 bpb.bps / sizeof(struct de)) +
502 (bpb.spc ? MINCLS16 : MAXCLS12 + 1) *
503 (bpb.spc ? bpb.spc : howmany(DEFBLK, bpb.bps)))
505 else if (bpb.rde || bpb.bsec <
506 (bpb.res ? bpb.res : bss) +
507 howmany((RESFTE + MAXCLS16) * 2, bpb.bps) * bpb.nft +
508 howmany(DEFRDE, bpb.bps / sizeof(struct de)) +
510 (bpb.spc ? bpb.spc : howmany(8192, bpb.bps)))
518 if (x == MAXU16 || x == bpb.bkbs)
519 errx(1, "no room for info sector");
522 if (bpb.infs != MAXU16 && x <= bpb.infs)
526 errx(1, "no room for backup sector");
528 } else if (bpb.bkbs != MAXU16 && bpb.bkbs == bpb.infs)
529 errx(1, "backup sector would overwrite info sector");
530 if (bpb.bkbs != MAXU16 && x <= bpb.bkbs)
534 bpb.res = fat == 32 ? MAX(x, MAX(16384 / bpb.bps, 4)) : x;
535 else if (bpb.res < x)
536 errx(1, "too few reserved sectors");
537 if (fat != 32 && !bpb.rde)
539 rds = howmany(bpb.rde, bpb.bps / sizeof(struct de));
541 for (bpb.spc = howmany(fat == 16 ? DEFBLK16 : DEFBLK, bpb.bps);
544 howmany((RESFTE + maxcls(fat)) * (fat / BPN),
545 bpb.bps * NPB) * bpb.nft +
547 (u_int64_t)(maxcls(fat) + 1) * bpb.spc <= bpb.bsec;
549 if (fat != 32 && bpb.bspf > MAXU16)
550 errx(1, "too many sectors/FAT for FAT12/16");
552 x = bpb.bspf ? bpb.bspf : 1;
553 if (x1 + (u_int64_t)x * bpb.nft > bpb.bsec)
554 errx(1, "meta data exceeds file system size");
556 x = (u_int64_t)(bpb.bsec - x1) * bpb.bps * NPB /
557 (bpb.spc * bpb.bps * NPB + fat / BPN * bpb.nft);
558 x2 = howmany((RESFTE + MIN(x, maxcls(fat))) * (fat / BPN),
562 x1 += (bpb.bspf - 1) * bpb.nft;
564 cls = (bpb.bsec - x1) / bpb.spc;
565 x = (u_int64_t)bpb.bspf * bpb.bps * NPB / (fat / BPN) - RESFTE;
569 warnx("warning: sectors/FAT limits file system to %u clusters",
571 if (cls < mincls(fat))
572 errx(1, "%u clusters too few clusters for FAT%u, need %u", cls, fat,
574 if (cls > maxcls(fat)) {
576 bpb.bsec = x1 + (cls + 1) * bpb.spc - 1;
577 warnx("warning: FAT type limits file system to %u sectors",
580 printf("%s: %u sector%s in %u FAT%u cluster%s "
581 "(%u bytes/cluster)\n", fname, cls * bpb.spc,
582 cls * bpb.spc == 1 ? "" : "s", cls, fat,
583 cls == 1 ? "" : "s", bpb.bps * bpb.spc);
585 bpb.mid = !bpb.hid ? 0xf0 : 0xf8;
588 if (bpb.hid + bpb.bsec <= MAXU16) {
598 gettimeofday(&tv, NULL);
600 tm = localtime(&now);
601 if (!(img = malloc(bpb.bps)))
603 dir = bpb.res + (bpb.spf ? bpb.spf : bpb.bspf) * bpb.nft;
604 for (lsn = 0; lsn < dir + (fat == 32 ? bpb.spc : rds); lsn++) {
607 fat == 32 && bpb.bkbs != MAXU16 &&
608 bss <= bpb.bkbs && x >= bpb.bkbs) {
610 if (!x && lseek(fd1, opt_ofs, SEEK_SET))
613 if (opt_B && x < bss) {
614 if ((n = read(fd1, img, bpb.bps)) == -1)
616 if ((unsigned)n != bpb.bps)
617 errx(1, "%s: can't read sector %u", bname, x);
619 memset(img, 0, bpb.bps);
621 (fat == 32 && bpb.bkbs != MAXU16 && lsn == bpb.bkbs)) {
622 x1 = sizeof(struct bs);
623 bsbpb = (struct bsbpb *)(img + x1);
624 mk2(bsbpb->bps, bpb.bps);
625 mk1(bsbpb->spc, bpb.spc);
626 mk2(bsbpb->res, bpb.res);
627 mk1(bsbpb->nft, bpb.nft);
628 mk2(bsbpb->rde, bpb.rde);
629 mk2(bsbpb->sec, bpb.sec);
630 mk1(bsbpb->mid, bpb.mid);
631 mk2(bsbpb->spf, bpb.spf);
632 mk2(bsbpb->spt, bpb.spt);
633 mk2(bsbpb->hds, bpb.hds);
634 mk4(bsbpb->hid, bpb.hid);
635 mk4(bsbpb->bsec, bpb.bsec);
636 x1 += sizeof(struct bsbpb);
638 bsxbpb = (struct bsxbpb *)(img + x1);
639 mk4(bsxbpb->bspf, bpb.bspf);
640 mk2(bsxbpb->xflg, 0);
641 mk2(bsxbpb->vers, 0);
642 mk4(bsxbpb->rdcl, bpb.rdcl);
643 mk2(bsxbpb->infs, bpb.infs);
644 mk2(bsxbpb->bkbs, bpb.bkbs);
645 x1 += sizeof(struct bsxbpb);
647 bsx = (struct bsx *)(img + x1);
652 x = (((u_int)(1 + tm->tm_mon) << 8 |
653 (u_int)tm->tm_mday) +
654 ((u_int)tm->tm_sec << 8 |
655 (u_int)(tv.tv_usec / 10))) << 16 |
656 ((u_int)(1900 + tm->tm_year) +
657 ((u_int)tm->tm_hour << 8 |
660 mklabel(bsx->label, opt_L ? opt_L : "NO NAME");
661 sprintf(buf, "FAT%u", fat);
662 setstr(bsx->type, buf, sizeof(bsx->type));
664 x1 += sizeof(struct bsx);
665 bs = (struct bs *)img;
666 mk1(bs->jmp[0], 0xeb);
667 mk1(bs->jmp[1], x1 - 2);
668 mk1(bs->jmp[2], 0x90);
669 setstr(bs->oem, opt_O ? opt_O : "BSD 4.4",
671 memcpy(img + x1, bootcode, sizeof(bootcode));
672 mk2(img + MINBPS - 2, DOSMAGIC);
674 } else if (fat == 32 && bpb.infs != MAXU16 &&
676 (bpb.bkbs != MAXU16 &&
677 lsn == bpb.bkbs + bpb.infs))) {
678 mk4(img, 0x41615252);
679 mk4(img + MINBPS - 28, 0x61417272);
680 mk4(img + MINBPS - 24, 0xffffffff);
681 mk4(img + MINBPS - 20, bpb.rdcl);
682 mk2(img + MINBPS - 2, DOSMAGIC);
683 } else if (lsn >= bpb.res && lsn < dir &&
685 (bpb.spf ? bpb.spf : bpb.bspf))) {
686 mk1(img[0], bpb.mid);
687 for (x = 1; x < fat * (fat == 32 ? 3 : 2) / 8; x++)
688 mk1(img[x], fat == 32 && x % 4 == 3 ? 0x0f : 0xff);
689 } else if (lsn == dir && opt_L) {
690 de = (struct de *)img;
691 mklabel(de->namext, opt_L);
693 x = (u_int)tm->tm_hour << 11 |
694 (u_int)tm->tm_min << 5 |
695 (u_int)tm->tm_sec >> 1;
697 x = (u_int)(tm->tm_year - 80) << 9 |
698 (u_int)(tm->tm_mon + 1) << 5 |
702 if ((n = write(fd, img, bpb.bps)) == -1)
704 if ((unsigned)n != bpb.bps)
705 errx(1, "%s: can't write sector %u", fname, lsn);
712 * Exit with error if file system is mounted.
715 check_mounted(const char *fname, mode_t mode)
722 if (!(n = getmntinfo(&mp, MNT_NOWAIT)))
723 err(1, "getmntinfo");
724 len = strlen(_PATH_DEV);
726 if (!strncmp(s1, _PATH_DEV, len))
728 r = S_ISCHR(mode) && s1 != fname && *s1 == 'r';
730 s2 = mp->f_mntfromname;
731 if (!strncmp(s2, _PATH_DEV, len))
733 if ((r && s2 != mp->f_mntfromname && !strcmp(s1 + 1, s2)) ||
735 errx(1, "%s is mounted on %s", fname, mp->f_mntonname);
740 * Get a standard format.
743 getstdfmt(const char *fmt, struct bpb *bpb)
747 x = sizeof(stdfmt) / sizeof(stdfmt[0]);
748 for (i = 0; i < x && strcmp(fmt, stdfmt[i].name); i++);
750 errx(1, "%s: unknown standard format", fmt);
751 *bpb = stdfmt[i].bpb;
755 * Get disk slice, partition, and geometry information.
758 getdiskinfo(int fd, const char *fname, const char *dtype, __unused int oflag,
761 struct disklabel *lp, dlp;
767 /* If the user specified a disk type, try to use that */
769 lp = getdiskbyname(dtype);
772 /* Maybe it's a floppy drive */
774 if (ioctl(fd, DIOCGMEDIASIZE, &ms) == -1) {
778 err(1, "Cannot get disk size");
779 /* create a fake geometry for a file image */
784 dlp.d_secperunit = ms / dlp.d_secsize;
786 } else if (ioctl(fd, FD_GTYPE, &type) != -1) {
787 dlp.d_secsize = 128 << type.secsize;
788 dlp.d_nsectors = type.sectrac;
789 dlp.d_ntracks = type.heads;
790 dlp.d_secperunit = ms / dlp.d_secsize;
795 /* Maybe it's a fixed drive */
797 if (ioctl(fd, DIOCGDINFO, &dlp) == -1) {
798 if (bpb->bps == 0 && ioctl(fd, DIOCGSECTORSIZE, &dlp.d_secsize) == -1)
799 errx(1, "Cannot get sector size, %s", strerror(errno));
801 /* XXX Should we use bpb->bps if it's set? */
802 dlp.d_secperunit = ms / dlp.d_secsize;
804 if (bpb->spt == 0 && ioctl(fd, DIOCGFWSECTORS, &dlp.d_nsectors) == -1) {
805 warnx("Cannot get number of sectors per track, %s", strerror(errno));
808 if (bpb->hds == 0 && ioctl(fd, DIOCGFWHEADS, &dlp.d_ntracks) == -1) {
809 warnx("Cannot get number of heads, %s", strerror(errno));
810 if (dlp.d_secperunit <= 63*1*1024)
812 else if (dlp.d_secperunit <= 63*16*1024)
819 hs = (ms / dlp.d_secsize) - dlp.d_secperunit;
824 bpb->bps = ckgeom(fname, lp->d_secsize, "bytes/sector");
826 bpb->spt = ckgeom(fname, lp->d_nsectors, "sectors/track");
828 bpb->hds = ckgeom(fname, lp->d_ntracks, "drive heads");
830 bpb->bsec = lp->d_secperunit;
836 * Print out BPB values.
839 print_bpb(struct bpb *bpb)
841 printf("bps=%u spc=%u res=%u nft=%u", bpb->bps, bpb->spc, bpb->res,
844 printf(" rde=%u", bpb->rde);
846 printf(" sec=%u", bpb->sec);
847 printf(" mid=%#x", bpb->mid);
849 printf(" spf=%u", bpb->spf);
850 printf(" spt=%u hds=%u hid=%u", bpb->spt, bpb->hds, bpb->hid);
852 printf(" bsec=%u", bpb->bsec);
854 printf(" bspf=%u rdcl=%u", bpb->bspf, bpb->rdcl);
856 printf(bpb->infs == MAXU16 ? "%#x" : "%u", bpb->infs);
858 printf(bpb->bkbs == MAXU16 ? "%#x" : "%u", bpb->bkbs);
864 * Check a disk geometry value.
867 ckgeom(const char *fname, u_int val, const char *msg)
870 errx(1, "%s: no default %s", fname, msg);
872 errx(1, "%s: illegal %s %d", fname, msg, val);
877 * Convert and check a numeric option argument.
880 argtou(const char *arg, u_int lo, u_int hi, const char *msg)
886 x = strtoul(arg, &s, 0);
887 if (errno || !*arg || *s || x < lo || x > hi)
888 errx(1, "%s: bad %s", arg, msg);
893 * Same for off_t, with optional skmgpP suffix
896 argtooff(const char *arg, const char *msg)
901 x = strtoll(arg, &s, 0);
902 /* allow at most one extra char */
903 if (errno || x < 0 || (s[0] && s[1]) )
904 errx(1, "%s: bad %s", arg, msg);
905 if (*s) { /* the extra char is the multiplier */
908 errx(1, "%s: bad %s", arg, msg);
911 case 's': /* sector */
913 x <<= 9; /* times 512 */
916 case 'k': /* kilobyte */
918 x <<= 10; /* times 1024 */
921 case 'm': /* megabyte */
923 x <<= 20; /* times 1024*1024 */
926 case 'g': /* gigabyte */
928 x <<= 30; /* times 1024*1024*1024 */
931 case 'p': /* partition start */
932 case 'P': /* partition start */
933 case 'l': /* partition length */
934 case 'L': /* partition length */
935 errx(1, "%s: not supported yet %s", arg, msg);
943 * Check a volume label.
946 oklabel(const char *src)
950 for (i = 0; i <= 11; i++) {
952 if (c < ' ' + !i || strchr("\"*+,./:;<=>?[\\]|", c))
959 * Make a volume label.
962 mklabel(u_int8_t *dest, const char *src)
966 for (i = 0; i < 11; i++) {
967 c = *src ? toupper(*src++) : ' ';
968 *dest++ = !i && c == '\xe5' ? 5 : c;
973 * Copy string, padding with spaces.
976 setstr(u_int8_t *dest, const char *src, size_t len)
979 *dest++ = *src ? *src++ : ' ';
983 * Print usage message.
989 "usage: newfs_msdos [ -options ] special [disktype]\n"
990 "where the options are:\n"
991 "\t-@ create file system at specified offset\n"
992 "\t-B get bootstrap from file\n"
993 "\t-C create image file with specified size\n"
994 "\t-F FAT type (12, 16, or 32)\n"
996 "\t-L volume label\n"
997 "\t-N don't create file system: just print out parameters\n"
999 "\t-S bytes/sector\n"
1000 "\t-a sectors/FAT\n"
1002 "\t-c sectors/cluster\n"
1003 "\t-e root directory entries\n"
1004 "\t-f standard format\n"
1005 "\t-h drive heads\n"
1006 "\t-i file system info sector\n"
1007 "\t-k backup boot sector\n"
1008 "\t-m media descriptor\n"
1009 "\t-n number of FATs\n"
1010 "\t-o hidden sectors\n"
1011 "\t-r reserved sectors\n"
1012 "\t-s file system size (sectors)\n"
1013 "\t-u sectors/track\n");