Bug Summary

File:src/usr.sbin/makefs/msdos/mkfs_msdos.c
Warning:line 440, column 6
Potential leak of memory pointed to by 'bname'

Annotated Source Code

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clang -cc1 -cc1 -triple amd64-unknown-openbsd7.4 -analyze -disable-free -clear-ast-before-backend -disable-llvm-verifier -discard-value-names -main-file-name mkfs_msdos.c -analyzer-checker=core -analyzer-checker=apiModeling -analyzer-checker=unix -analyzer-checker=deadcode -analyzer-checker=security.insecureAPI.UncheckedReturn -analyzer-checker=security.insecureAPI.getpw -analyzer-checker=security.insecureAPI.gets -analyzer-checker=security.insecureAPI.mktemp -analyzer-checker=security.insecureAPI.mkstemp -analyzer-checker=security.insecureAPI.vfork -analyzer-checker=nullability.NullPassedToNonnull -analyzer-checker=nullability.NullReturnedFromNonnull -analyzer-output plist -w -setup-static-analyzer -mrelocation-model pic -pic-level 1 -pic-is-pie -mframe-pointer=all -relaxed-aliasing -ffp-contract=on -fno-rounding-math -mconstructor-aliases -funwind-tables=2 -target-cpu x86-64 -target-feature +retpoline-indirect-calls -target-feature +retpoline-indirect-branches -tune-cpu generic -debugger-tuning=gdb -fcoverage-compilation-dir=/usr/src/usr.sbin/makefs/obj -resource-dir /usr/local/llvm16/lib/clang/16 -I /usr/src/usr.sbin/makefs -internal-isystem /usr/local/llvm16/lib/clang/16/include -internal-externc-isystem /usr/include -O2 -fdebug-compilation-dir=/usr/src/usr.sbin/makefs/obj -ferror-limit 19 -fwrapv -D_RET_PROTECTOR -ret-protector -fcf-protection=branch -fno-jump-tables -fgnuc-version=4.2.1 -vectorize-loops -vectorize-slp -fno-builtin-malloc -fno-builtin-calloc -fno-builtin-realloc -fno-builtin-valloc -fno-builtin-free -fno-builtin-strdup -fno-builtin-strndup -analyzer-output=html -faddrsig -D__GCC_HAVE_DWARF2_CFI_ASM=1 -o /home/ben/Projects/scan/2024-01-11-140451-98009-1 -x c /usr/src/usr.sbin/makefs/msdos/mkfs_msdos.c
1/* $OpenBSD: mkfs_msdos.c,v 1.7 2022/02/28 16:17:37 krw Exp $ */
2/* $NetBSD: mkfs_msdos.c,v 1.10 2016/04/03 11:00:13 mlelstv Exp $ */
3
4/*
5 * Copyright (c) 1998 Robert Nordier
6 * All rights reserved.
7 *
8 * Redistribution and use in source and binary forms, with or without
9 * modification, are permitted provided that the following conditions
10 * are met:
11 * 1. Redistributions of source code must retain the above copyright
12 * notice, this list of conditions and the following disclaimer.
13 * 2. Redistributions in binary form must reproduce the above copyright
14 * notice, this list of conditions and the following disclaimer in
15 * the documentation and/or other materials provided with the
16 * distribution.
17 *
18 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR(S) ``AS IS'' AND ANY EXPRESS
19 * OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
20 * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
21 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR(S) BE LIABLE FOR ANY
22 * DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
23 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE
24 * GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
25 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER
26 * IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
27 * OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN
28 * IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
29 */
30
31#include <sys/param.h> /* powerof2 */
32#include <sys/types.h>
33#include <sys/stat.h>
34#include <sys/time.h>
35
36#include <ctype.h>
37#include <err.h>
38#include <errno(*__errno()).h>
39#include <fcntl.h>
40#include <paths.h>
41#include <stdio.h>
42#include <stdint.h>
43#include <stdlib.h>
44#include <limits.h>
45#include <string.h>
46#include <time.h>
47#include <unistd.h>
48#include <signal.h>
49
50#include <util.h>
51
52#include "makefs.h"
53#include "msdos/mkfs_msdos.h"
54
55#define MAXU160xffff 0xffff /* maximum unsigned 16-bit quantity */
56#define BPN4 4 /* bits per nibble */
57#define NPB2 2 /* nibbles per byte */
58
59#define DOSMAGIC0xaa55 0xaa55 /* DOS magic number */
60#define MINBPS512 512 /* minimum bytes per sector */
61#define MAXSPC128 128 /* maximum sectors per cluster */
62#define MAXNFT16 16 /* maximum number of FATs */
63#define DEFBLK4096 4096 /* default block size */
64#define DEFBLK162048 2048 /* default block size FAT16 */
65#define DEFRDE512 512 /* default root directory entries */
66#define RESFTE2 2 /* reserved FAT entries */
67#define MINCLS121 1 /* minimum FAT12 clusters */
68#define MINCLS160xff5 0xff5 /* minimum FAT16 clusters */
69#define MINCLS320xfff5 0xfff5 /* minimum FAT32 clusters */
70#define MAXCLS120xff4 0xff4 /* maximum FAT12 clusters */
71#define MAXCLS160xfff4 0xfff4 /* maximum FAT16 clusters */
72#define MAXCLS320xffffff4 0xffffff4 /* maximum FAT32 clusters */
73
74#define mincls(fat_type)((fat_type) == 12 ? 1 : (fat_type) == 16 ? 0xff5 : 0xfff5) ((fat_type) == 12 ? MINCLS121 : \
75 (fat_type) == 16 ? MINCLS160xff5 : \
76 MINCLS320xfff5)
77
78#define maxcls(fat_type)((fat_type) == 12 ? 0xff4 : (fat_type) == 16 ? 0xfff4 : 0xffffff4
) ((fat_type) == 12 ? MAXCLS120xff4 : \
79 (fat_type) == 16 ? MAXCLS160xfff4 : \
80 MAXCLS320xffffff4)
81
82#define mk1(p, x)(p) = (u_int8_t)(x) \
83 (p) = (u_int8_t)(x)
84
85#define mk2(p, x)(p)[0] = (u_int8_t)(x), (p)[1] = (u_int8_t)((x) >> 010) \
86 (p)[0] = (u_int8_t)(x), \
87 (p)[1] = (u_int8_t)((x) >> 010)
88
89#define mk4(p, x)(p)[0] = (u_int8_t)(x), (p)[1] = (u_int8_t)((x) >> 010)
, (p)[2] = (u_int8_t)((x) >> 020), (p)[3] = (u_int8_t)(
(x) >> 030) \
90 (p)[0] = (u_int8_t)(x), \
91 (p)[1] = (u_int8_t)((x) >> 010), \
92 (p)[2] = (u_int8_t)((x) >> 020), \
93 (p)[3] = (u_int8_t)((x) >> 030)
94
95struct bs {
96 u_int8_t jmp[3]; /* bootstrap entry point */
97 u_int8_t oem[8]; /* OEM name and version */
98};
99
100struct bsbpb {
101 u_int8_t bps[2]; /* bytes per sector */
102 u_int8_t spc; /* sectors per cluster */
103 u_int8_t res[2]; /* reserved sectors */
104 u_int8_t nft; /* number of FATs */
105 u_int8_t rde[2]; /* root directory entries */
106 u_int8_t sec[2]; /* total sectors */
107 u_int8_t mid; /* media descriptor */
108 u_int8_t spf[2]; /* sectors per FAT */
109 u_int8_t spt[2]; /* sectors per track */
110 u_int8_t hds[2]; /* drive heads */
111 u_int8_t hid[4]; /* hidden sectors */
112 u_int8_t bsec[4]; /* big total sectors */
113};
114
115struct bsxbpb {
116 u_int8_t bspf[4]; /* big sectors per FAT */
117 u_int8_t xflg[2]; /* FAT control flags */
118 u_int8_t vers[2]; /* file system version */
119 u_int8_t rdcl[4]; /* root directory start cluster */
120 u_int8_t infs[2]; /* file system info sector */
121 u_int8_t bkbs[2]; /* backup boot sector */
122 u_int8_t rsvd[12]; /* reserved */
123};
124
125struct bsx {
126 u_int8_t drv; /* drive number */
127 u_int8_t rsvd; /* reserved */
128 u_int8_t sig; /* extended boot signature */
129 u_int8_t volid[4]; /* volume ID number */
130 u_int8_t label[11]; /* volume label */
131 u_int8_t type[8]; /* file system type */
132};
133
134struct de {
135 u_int8_t namext[11]; /* name and extension */
136 u_int8_t attr; /* attributes */
137 u_int8_t rsvd[10]; /* reserved */
138 u_int8_t time[2]; /* creation time */
139 u_int8_t date[2]; /* creation date */
140 u_int8_t clus[2]; /* starting cluster */
141 u_int8_t size[4]; /* size */
142};
143
144struct bpb {
145 u_int bps; /* bytes per sector */
146 u_int spc; /* sectors per cluster */
147 u_int res; /* reserved sectors */
148 u_int nft; /* number of FATs */
149 u_int rde; /* root directory entries */
150 u_int sec; /* total sectors */
151 u_int mid; /* media descriptor */
152 u_int spf; /* sectors per FAT */
153 u_int spt; /* sectors per track */
154 u_int hds; /* drive heads */
155 u_int hid; /* hidden sectors */
156 u_int bsec; /* big total sectors */
157 u_int bspf; /* big sectors per FAT */
158 u_int rdcl; /* root directory start cluster */
159 u_int infs; /* file system info sector */
160 u_int bkbs; /* backup boot sector */
161};
162
163#define INIT(a, b, c, d, e, f, g, h, i, j){ .bps = a, .spc = b, .res = c, .nft = d, .rde = e, .sec = f,
.mid = g, .spf = h, .spt = i, .hds = j, } \
164 { .bps = a, .spc = b, .res = c, .nft = d, .rde = e, \
165 .sec = f, .mid = g, .spf = h, .spt = i, .hds = j, }
166static struct {
167 const char *name;
168 struct bpb bpb;
169} stdfmt[] = {
170 {"160", INIT(512, 1, 1, 2, 64, 320, 0xfe, 1, 8, 1){ .bps = 512, .spc = 1, .res = 1, .nft = 2, .rde = 64, .sec =
320, .mid = 0xfe, .spf = 1, .spt = 8, .hds = 1, }},
171 {"180", INIT(512, 1, 1, 2, 64, 360, 0xfc, 2, 9, 1){ .bps = 512, .spc = 1, .res = 1, .nft = 2, .rde = 64, .sec =
360, .mid = 0xfc, .spf = 2, .spt = 9, .hds = 1, }},
172 {"320", INIT(512, 2, 1, 2, 112, 640, 0xff, 1, 8, 2){ .bps = 512, .spc = 2, .res = 1, .nft = 2, .rde = 112, .sec =
640, .mid = 0xff, .spf = 1, .spt = 8, .hds = 2, }},
173 {"360", INIT(512, 2, 1, 2, 112, 720, 0xfd, 2, 9, 2){ .bps = 512, .spc = 2, .res = 1, .nft = 2, .rde = 112, .sec =
720, .mid = 0xfd, .spf = 2, .spt = 9, .hds = 2, }},
174 {"640", INIT(512, 2, 1, 2, 112, 1280, 0xfb, 2, 8, 2){ .bps = 512, .spc = 2, .res = 1, .nft = 2, .rde = 112, .sec =
1280, .mid = 0xfb, .spf = 2, .spt = 8, .hds = 2, }},
175 {"720", INIT(512, 2, 1, 2, 112, 1440, 0xf9, 3, 9, 2){ .bps = 512, .spc = 2, .res = 1, .nft = 2, .rde = 112, .sec =
1440, .mid = 0xf9, .spf = 3, .spt = 9, .hds = 2, }},
176 {"1200", INIT(512, 1, 1, 2, 224, 2400, 0xf9, 7, 15, 2){ .bps = 512, .spc = 1, .res = 1, .nft = 2, .rde = 224, .sec =
2400, .mid = 0xf9, .spf = 7, .spt = 15, .hds = 2, }},
177 {"1232", INIT(1024,1, 1, 2, 192, 1232, 0xfe, 2, 8, 2){ .bps = 1024, .spc = 1, .res = 1, .nft = 2, .rde = 192, .sec
= 1232, .mid = 0xfe, .spf = 2, .spt = 8, .hds = 2, }},
178 {"1440", INIT(512, 1, 1, 2, 224, 2880, 0xf0, 9, 18, 2){ .bps = 512, .spc = 1, .res = 1, .nft = 2, .rde = 224, .sec =
2880, .mid = 0xf0, .spf = 9, .spt = 18, .hds = 2, }},
179 {"2880", INIT(512, 2, 1, 2, 240, 5760, 0xf0, 9, 36, 2){ .bps = 512, .spc = 2, .res = 1, .nft = 2, .rde = 240, .sec =
5760, .mid = 0xf0, .spf = 9, .spt = 36, .hds = 2, }}
180};
181
182static u_int8_t bootcode[] = {
183 0xfa, /* cli */
184 0x31, 0xc0, /* xor ax,ax */
185 0x8e, 0xd0, /* mov ss,ax */
186 0xbc, 0x00, 0x7c, /* mov sp,7c00h */
187 0xfb, /* sti */
188 0x8e, 0xd8, /* mov ds,ax */
189 0xe8, 0x00, 0x00, /* call $ + 3 */
190 0x5e, /* pop si */
191 0x83, 0xc6, 0x19, /* add si,+19h */
192 0xbb, 0x07, 0x00, /* mov bx,0007h */
193 0xfc, /* cld */
194 0xac, /* lodsb */
195 0x84, 0xc0, /* test al,al */
196 0x74, 0x06, /* jz $ + 8 */
197 0xb4, 0x0e, /* mov ah,0eh */
198 0xcd, 0x10, /* int 10h */
199 0xeb, 0xf5, /* jmp $ - 9 */
200 0x30, 0xe4, /* xor ah,ah */
201 0xcd, 0x16, /* int 16h */
202 0xcd, 0x19, /* int 19h */
203 0x0d, 0x0a,
204 'N', 'o', 'n', '-', 's', 'y', 's', 't',
205 'e', 'm', ' ', 'd', 'i', 's', 'k',
206 0x0d, 0x0a,
207 'P', 'r', 'e', 's', 's', ' ', 'a', 'n',
208 'y', ' ', 'k', 'e', 'y', ' ', 't', 'o',
209 ' ', 'r', 'e', 'b', 'o', 'o', 't',
210 0x0d, 0x0a,
211 0
212};
213
214static int got_siginfo = 0; /* received a SIGINFO */
215
216static int getstdfmt(const char *, struct bpb *);
217static int getbpbinfo(int, const char *, const char *, int, struct bpb *, int);
218static void print_bpb(struct bpb *);
219static int ckgeom(const char *, u_int, const char *);
220static int oklabel(const char *);
221static void mklabel(u_int8_t *, const char *);
222static void setstr(u_int8_t *, const char *, size_t);
223static void infohandler(int sig);
224
225int
226mkfs_msdos(const char *fname, const char *dtype, const struct msdos_options *op)
227{
228 char buf[PATH_MAX1024];
229 struct stat sb;
230 struct timeval tv;
231 struct bpb bpb;
232 struct tm *tm;
233 struct bs *bs;
234 struct bsbpb *bsbpb;
235 struct bsxbpb *bsxbpb;
236 struct bsx *bsx;
237 struct de *de;
238 u_int8_t *img;
239 const char *bname;
240 ssize_t n;
241 time_t now;
242 u_int bss, rds, cls, dir, lsn, x, x1, x2;
243 int ch, fd, fd1;
244 struct msdos_options o = *op;
245 int oflags = O_RDWR0x0002 | O_CREAT0x0200;
246
247 if (o.block_size && o.sectors_per_cluster) {
1
Assuming field 'block_size' is 0
→
248 warnx("Cannot specify both block size and sectors per cluster");
249 return -1;
250 }
251 if (o.OEM_string && strlen(o.OEM_string) > 8) {
2
←
Assuming field 'OEM_string' is null
→
252 warnx("%s: bad OEM string", o.OEM_string);
253 return -1;
254 }
255 if (o.create_size) {
3
←
Assuming field 'create_size' is 0
→
256 if (o.offset == 0)
257 oflags |= O_TRUNC0x0400;
258 fd = open(fname, oflags, 0644);
259 if (fd == -1) {
260 warnx("failed to create %s", fname);
261 return -1;
262 }
263 (void)lseek(fd, o.create_size - 1, SEEK_SET0);
264 if (write(fd, "\0", 1) != 1) {
265 warn("failed to set file size");
266 return -1;
267 }
268 (void)lseek(fd, 0, SEEK_SET0);
269 } else if ((fd = open(fname, O_RDWR0x0002)) == -1 ||
4
←
Assuming the condition is false
→
270 fstat(fd, &sb)) {
5
←
Assuming the condition is false
→
271 warn("%s", fname);
272 return -1;
273 }
274 if (!S_ISCHR(sb.st_mode)((sb.st_mode & 0170000) == 0020000) && !o.create_size) {
6
←
Assuming the condition is true
→
275 warnx("warning, %s is not a character device", fname);
276 return -1;
277 }
278 if (o.offset && o.offset != lseek(fd, o.offset, SEEK_SET0)) {
7
←
Assuming field 'offset' is 0
→
279 warnx("cannot seek to %jd", (intmax_t)o.offset);
280 return -1;
281 }
282 memset(&bpb, 0, sizeof(bpb));
283 if (o.floppy) {
8
←
Assuming field 'floppy' is null
→
9
←
Taking false branch
→
284 if (getstdfmt(o.floppy, &bpb) == -1)
285 return -1;
286 bpb.bsec = bpb.sec;
287 bpb.sec = 0;
288 bpb.bspf = bpb.spf;
289 bpb.spf = 0;
290 }
291 if (o.drive_heads)
10
←
Assuming field 'drive_heads' is 0
→
11
←
Taking false branch
→
292 bpb.hds = o.drive_heads;
293 if (o.sectors_per_track)
12
←
Assuming field 'sectors_per_track' is 0
→
13
←
Taking false branch
→
294 bpb.spt = o.sectors_per_track;
295 if (o.bytes_per_sector)
14
←
Assuming field 'bytes_per_sector' is 0
→
15
←
Taking false branch
→
296 bpb.bps = o.bytes_per_sector;
297 if (o.size)
16
←
Assuming field 'size' is 0
→
17
←
Taking false branch
→
298 bpb.bsec = o.size;
299 if (o.hidden_sectors_set)
18
←
Assuming field 'hidden_sectors_set' is 0
→
300 bpb.hid = o.hidden_sectors;
301 if (!(o.floppy
18.1
Field 'floppy' is null
 || (o.drive_heads
18.2
Field 'drive_heads' is 0
 && o.sectors_per_track &&
19
←
Taking true branch
→
302 o.bytes_per_sector && o.size && o.hidden_sectors_set))) {
303 if (getbpbinfo(fd, fname, dtype, o.hidden_sectors_set, &bpb,
20
←
Taking false branch
→
304 o.create_size != 0) == -1)
305 return -1;
306 bpb.bsec -= (o.offset / bpb.bps);
307 if (bpb.spc
20.1
Field 'spc' is equal to 0
 == 0) { /* set defaults */
21
←
Taking true branch
→
308 /* minimum cluster size */
309 switch (o.fat_type) {
22
←
Control jumps to the 'default' case at line 318
→
310 case 12:
311 bpb.spc = 1; /* use 512 bytes */
312 x = 2; /* up to 2MB */
313 break;
314 case 16:
315 bpb.spc = 1; /* use 512 bytes */
316 x = 32; /* up to 32MB */
317 break;
318 default:
319 bpb.spc = 8; /* use 4k */
320 x = 8192; /* up to 8GB */
321 break;
23
←
 Execution continues on line 323
→
322 }
323 x1 = howmany(bpb.bsec, (1048576 / 512))(((bpb.bsec) + (((1048576 / 512)) - 1)) / ((1048576 / 512))); /* -> MB */
324 while (bpb.spc
23.1
Field 'spc' is < 128
 < 128 && x < x1) {
24
←
Assuming 'x' is >= 'x1'
→
325 x *= 2;
326 bpb.spc *= 2;
327 }
328 }
329 }
330
331 if (o.volume_label && !oklabel(o.volume_label)) {
25
←
Assuming field 'volume_label' is null
→
332 warnx("%s: bad volume label", o.volume_label);
333 return -1;
334 }
335
336 switch (o.fat_type) {
26
←
Control jumps to 'case 32:' at line 354
→
337 case 0:
338 if (o.floppy)
339 o.fat_type = 12;
340 else if (!o.directory_entries && (o.info_sector || o.backup_sector))
341 o.fat_type = 32;
342 break;
343 case 12:
344 case 16:
345 if (o.info_sector) {
346 warnx("Cannot specify info sector with FAT%u", o.fat_type);
347 return -1;
348 }
349 if (o.backup_sector) {
350 warnx("Cannot specify backup sector with FAT%u", o.fat_type);
351 return -1;
352 }
353 break;
354 case 32:
355 if (o.directory_entries) {
27
←
Assuming field 'directory_entries' is 0
→
28
←
Taking false branch
→
356 warnx("Cannot specify directory entries with FAT32");
357 return -1;
358 }
359 break;
360 default:
361 warnx("%d: bad FAT type", o.fat_type);
362 return -1;
363 }
364 if (!powerof2(bpb.bps)((((bpb.bps)-1)&(bpb.bps))==0)) {
30
←
Taking false branch
→
365 warnx("bytes/sector (%u) is not a power of 2", bpb.bps);
366 return -1;
367 }
368 if (bpb.bps
30.1
Field 'bps' is >= MINBPS
 < MINBPS512) {
29
←
 Execution continues on line 364
→
369 warnx("bytes/sector (%u) is too small; minimum is %u",
370 bpb.bps, MINBPS512);
371 return -1;
372 }
373
374 if (o.floppy
30.2
Field 'floppy' is null
 && o.fat_type == 32)
375 bpb.rde = 0;
376 if (o.block_size
30.3
Field 'block_size' is 0
) {
31
←
Taking false branch
→
377 if (!powerof2(o.block_size)((((o.block_size)-1)&(o.block_size))==0)) {
378 warnx("block size (%u) is not a power of 2", o.block_size);
379 return -1;
380 }
381 if (o.block_size < bpb.bps) {
382 warnx("block size (%u) is too small; minimum is %u",
383 o.block_size, bpb.bps);
384 return -1;
385 }
386 if (o.block_size > bpb.bps * MAXSPC128) {
387 warnx("block size (%u) is too large; maximum is %u",
388 o.block_size, bpb.bps * MAXSPC128);
389 return -1;
390 }
391 bpb.spc = o.block_size / bpb.bps;
392 }
393 if (o.sectors_per_cluster) {
32
←
Assuming field 'sectors_per_cluster' is 0
→
33
←
Taking false branch
→
394 if (!powerof2(o.sectors_per_cluster)((((o.sectors_per_cluster)-1)&(o.sectors_per_cluster))==0
)) {
395 warnx("sectors/cluster (%u) is not a power of 2",
396 o.sectors_per_cluster);
397 return -1;
398 }
399 bpb.spc = o.sectors_per_cluster;
400 }
401 if (o.reserved_sectors)
34
←
Assuming field 'reserved_sectors' is 0
→
35
←
Taking false branch
→
402 bpb.res = o.reserved_sectors;
403 if (o.num_FAT) {
36
←
Assuming field 'num_FAT' is 0
→
37
←
Taking false branch
→
404 if (o.num_FAT > MAXNFT16) {
405 warnx("number of FATs (%u) is too large; maximum is %u",
406 o.num_FAT, MAXNFT16);
407 return -1;
408 }
409 bpb.nft = o.num_FAT;
410 }
411 if (o.directory_entries
37.1
Field 'directory_entries' is 0
)
38
←
Taking false branch
→
412 bpb.rde = o.directory_entries;
413 if (o.media_descriptor_set) {
39
←
Assuming field 'media_descriptor_set' is 0
→
40
←
Taking false branch
→
414 if (o.media_descriptor < 0xf0) {
415 warnx("illegal media descriptor (%#x)", o.media_descriptor);
416 return -1;
417 }
418 bpb.mid = o.media_descriptor;
419 }
420 if (o.sectors_per_fat)
41
←
Assuming field 'sectors_per_fat' is 0
→
42
←
Taking false branch
→
421 bpb.bspf = o.sectors_per_fat;
422 if (o.info_sector)
43
←
Assuming field 'info_sector' is 0
→
44
←
Taking false branch
→
423 bpb.infs = o.info_sector;
424 if (o.backup_sector)
45
←
Assuming field 'backup_sector' is 0
→
46
←
Taking false branch
→
425 bpb.bkbs = o.backup_sector;
426 bss = 1;
427 bname = NULL((void *)0);
428 fd1 = -1;
429 if (o.bootstrap) {
47
←
Assuming field 'bootstrap' is non-null
→
48
←
Taking true branch
→
430 bname = o.bootstrap;
431 if (!strchr(bname, '/')) {
49
←
Assuming the condition is true
→
50
←
Taking true branch
→
432 snprintf(buf, sizeof(buf), "/boot/%s", bname);
433 if (!(bname = strdup(buf))) {
51
←
Memory is allocated
→
52
←
Assuming 'bname' is non-null
→
434 warn(NULL((void *)0));
435 return -1;
436 }
437 }
438 if ((fd1 = open(bname, O_RDONLY0x0000)) == -1 || fstat(fd1, &sb)) {
53
←
Assuming the condition is true
→
439 warn("%s", bname);
440 return -1;
54
←
Potential leak of memory pointed to by 'bname'
441 }
442 if (!S_ISREG(sb.st_mode)((sb.st_mode & 0170000) == 0100000) || sb.st_size % bpb.bps ||
443 sb.st_size < bpb.bps || sb.st_size > bpb.bps * MAXU160xffff) {
444 warnx("%s: inappropriate file type or format", bname);
445 return -1;
446 }
447 bss = sb.st_size / bpb.bps;
448 }
449 if (!bpb.nft)
450 bpb.nft = 2;
451 if (!o.fat_type) {
452 if (bpb.bsec < (bpb.res ? bpb.res : bss) +
453 howmany((RESFTE + (bpb.spc ? MINCLS16 : MAXCLS12 + 1)) *((((2 + (bpb.spc ? 0xff5 : 0xff4 + 1)) * ((bpb.spc ? 16 : 12)
/ 4)) + ((bpb.bps * 2) - 1)) / (bpb.bps * 2))
454 ((bpb.spc ? 16 : 12) / BPN), bpb.bps * NPB)((((2 + (bpb.spc ? 0xff5 : 0xff4 + 1)) * ((bpb.spc ? 16 : 12)
/ 4)) + ((bpb.bps * 2) - 1)) / (bpb.bps * 2)) *
455 bpb.nft +
456 howmany(bpb.rde ? bpb.rde : DEFRDE,(((bpb.rde ? bpb.rde : 512) + ((bpb.bps / sizeof(struct de)) -
1)) / (bpb.bps / sizeof(struct de)))
457 bpb.bps / sizeof(struct de))(((bpb.rde ? bpb.rde : 512) + ((bpb.bps / sizeof(struct de)) -
1)) / (bpb.bps / sizeof(struct de))) +
458 (bpb.spc ? MINCLS160xff5 : MAXCLS120xff4 + 1) *
459 (bpb.spc ? bpb.spc : howmany(DEFBLK, bpb.bps)(((4096) + ((bpb.bps) - 1)) / (bpb.bps))))
460 o.fat_type = 12;
461 else if (bpb.rde || bpb.bsec <
462 (bpb.res ? bpb.res : bss) +
463 howmany((RESFTE + MAXCLS16) * 2, bpb.bps)((((2 + 0xfff4) * 2) + ((bpb.bps) - 1)) / (bpb.bps)) * bpb.nft +
464 howmany(DEFRDE, bpb.bps / sizeof(struct de))(((512) + ((bpb.bps / sizeof(struct de)) - 1)) / (bpb.bps / sizeof
(struct de))) +
465 (MAXCLS160xfff4 + 1) *
466 (bpb.spc ? bpb.spc : howmany(8192, bpb.bps)(((8192) + ((bpb.bps) - 1)) / (bpb.bps))))
467 o.fat_type = 16;
468 else
469 o.fat_type = 32;
470 }
471 x = bss;
472 if (o.fat_type == 32) {
473 if (!bpb.infs) {
474 if (x == MAXU160xffff || x == bpb.bkbs) {
475 warnx("no room for info sector");
476 return -1;
477 }
478 bpb.infs = x;
479 }
480 if (bpb.infs != MAXU160xffff && x <= bpb.infs)
481 x = bpb.infs + 1;
482 if (!bpb.bkbs) {
483 if (x == MAXU160xffff) {
484 warnx("no room for backup sector");
485 return -1;
486 }
487 bpb.bkbs = x;
488 } else if (bpb.bkbs != MAXU160xffff && bpb.bkbs == bpb.infs) {
489 warnx("backup sector would overwrite info sector");
490 return -1;
491 }
492 if (bpb.bkbs != MAXU160xffff && x <= bpb.bkbs)
493 x = bpb.bkbs + 1;
494 }
495 if (!bpb.res)
496 bpb.res = o.fat_type == 32 ? MAXIMUM(x, MAXIMUM(16384 / bpb.bps, 4))(((x) > ((((16384 / bpb.bps) > (4)) ? (16384 / bpb.bps)
: (4)))) ? (x) : ((((16384 / bpb.bps) > (4)) ? (16384 / bpb
.bps) : (4)))) : x;
497 else if (bpb.res < x) {
498 warnx("too few reserved sectors (need %d have %d)", x, bpb.res);
499 return -1;
500 }
501 if (o.fat_type != 32 && !bpb.rde)
502 bpb.rde = DEFRDE512;
503 rds = howmany(bpb.rde, bpb.bps / sizeof(struct de))(((bpb.rde) + ((bpb.bps / sizeof(struct de)) - 1)) / (bpb.bps
/ sizeof(struct de)));
504 if (!bpb.spc)
505 for (bpb.spc = howmany(o.fat_type == 16 ? DEFBLK16 : DEFBLK, bpb.bps)(((o.fat_type == 16 ? 2048 : 4096) + ((bpb.bps) - 1)) / (bpb.
bps));
506 bpb.spc < MAXSPC128 &&
507 bpb.res +
508 howmany((RESFTE + maxcls(o.fat_type)) * (o.fat_type / BPN),((((2 + ((o.fat_type) == 12 ? 0xff4 : (o.fat_type) == 16 ? 0xfff4
: 0xffffff4)) * (o.fat_type / 4)) + ((bpb.bps * 2) - 1)) / (
bpb.bps * 2))
509 bpb.bps * NPB)((((2 + ((o.fat_type) == 12 ? 0xff4 : (o.fat_type) == 16 ? 0xfff4
: 0xffffff4)) * (o.fat_type / 4)) + ((bpb.bps * 2) - 1)) / (
bpb.bps * 2)) * bpb.nft +
510 rds +
511 (u_int64_t)(maxcls(o.fat_type)((o.fat_type) == 12 ? 0xff4 : (o.fat_type) == 16 ? 0xfff4 : 0xffffff4
) + 1) * bpb.spc <= bpb.bsec;
512 bpb.spc <<= 1);
513 if (o.fat_type != 32 && bpb.bspf > MAXU160xffff) {
514 warnx("too many sectors/FAT for FAT12/16");
515 return -1;
516 }
517 x1 = bpb.res + rds;
518 x = bpb.bspf ? bpb.bspf : 1;
519 if (x1 + (u_int64_t)x * bpb.nft > bpb.bsec) {
520 warnx("meta data exceeds file system size");
521 return -1;
522 }
523 x1 += x * bpb.nft;
524 x = (u_int64_t)(bpb.bsec - x1) * bpb.bps * NPB2 /
525 (bpb.spc * bpb.bps * NPB2 + o.fat_type / BPN4 * bpb.nft);
526 x2 = howmany((RESFTE + MINIMUM(x, maxcls(o.fat_type))) * (o.fat_type / BPN),((((2 + (((x) < (((o.fat_type) == 12 ? 0xff4 : (o.fat_type
) == 16 ? 0xfff4 : 0xffffff4))) ? (x) : (((o.fat_type) == 12 ?
0xff4 : (o.fat_type) == 16 ? 0xfff4 : 0xffffff4)))) * (o.fat_type
/ 4)) + ((bpb.bps * 2) - 1)) / (bpb.bps * 2))
527 bpb.bps * NPB)((((2 + (((x) < (((o.fat_type) == 12 ? 0xff4 : (o.fat_type
) == 16 ? 0xfff4 : 0xffffff4))) ? (x) : (((o.fat_type) == 12 ?
0xff4 : (o.fat_type) == 16 ? 0xfff4 : 0xffffff4)))) * (o.fat_type
/ 4)) + ((bpb.bps * 2) - 1)) / (bpb.bps * 2));
528 if (!bpb.bspf) {
529 bpb.bspf = x2;
530 x1 += (bpb.bspf - 1) * bpb.nft;
531 }
532 cls = (bpb.bsec - x1) / bpb.spc;
533 x = (u_int64_t)bpb.bspf * bpb.bps * NPB2 / (o.fat_type / BPN4) - RESFTE2;
534 if (cls > x)
535 cls = x;
536 if (bpb.bspf < x2) {
537 warnx("warning: sectors/FAT limits file system to %u clusters",
538 cls);
539 return -1;
540 }
541 if (cls < mincls(o.fat_type)((o.fat_type) == 12 ? 1 : (o.fat_type) == 16 ? 0xff5 : 0xfff5
)) {
542 warnx("%u clusters too few clusters for FAT%u, need %u", cls,
543 o.fat_type, mincls(o.fat_type)((o.fat_type) == 12 ? 1 : (o.fat_type) == 16 ? 0xff5 : 0xfff5
));
544 return -1;
545 }
546 if (cls > maxcls(o.fat_type)((o.fat_type) == 12 ? 0xff4 : (o.fat_type) == 16 ? 0xfff4 : 0xffffff4
)) {
547 cls = maxcls(o.fat_type)((o.fat_type) == 12 ? 0xff4 : (o.fat_type) == 16 ? 0xfff4 : 0xffffff4
);
548 bpb.bsec = x1 + (cls + 1) * bpb.spc - 1;
549 warnx("warning: FAT type limits file system to %u sectors",
550 bpb.bsec);
551 return -1;
552 }
553 printf("%s: %u sector%s in %u FAT%u cluster%s "
554 "(%u bytes/cluster)\n", fname, cls * bpb.spc,
555 cls * bpb.spc == 1 ? "" : "s", cls, o.fat_type,
556 cls == 1 ? "" : "s", bpb.bps * bpb.spc);
557 if (!bpb.mid)
558 bpb.mid = !bpb.hid ? 0xf0 : 0xf8;
559 if (o.fat_type == 32)
560 bpb.rdcl = RESFTE2;
561 if (bpb.hid + bpb.bsec <= MAXU160xffff) {
562 bpb.sec = bpb.bsec;
563 bpb.bsec = 0;
564 }
565 if (o.fat_type != 32) {
566 bpb.spf = bpb.bspf;
567 bpb.bspf = 0;
568 }
569 ch = 0;
570 if (o.fat_type == 12)
571 ch = 1; /* 001 Primary DOS with 12 bit FAT */
572 else if (o.fat_type == 16) {
573 if (bpb.bsec == 0)
574 ch = 4; /* 004 Primary DOS with 16 bit FAT <32M */
575 else
576 ch = 6; /* 006 Primary 'big' DOS, 16-bit FAT (> 32MB) */
577 /*
578 * XXX: what about:
579 * 014 DOS (16-bit FAT) - LBA
580 * ?
581 */
582 } else if (o.fat_type == 32) {
583 ch = 11; /* 011 Primary DOS with 32 bit FAT */
584 /*
585 * XXX: what about:
586 * 012 Primary DOS with 32 bit FAT - LBA
587 * ?
588 */
589 }
590 if (ch != 0)
591 printf("MBR type: %d\n", ch);
592 print_bpb(&bpb);
593
594 gettimeofday(&tv, NULL((void *)0));
595 now = tv.tv_sec;
596 tm = localtime(&now);
597 img = emalloc(bpb.bps);
598 dir = bpb.res + (bpb.spf ? bpb.spf : bpb.bspf) * bpb.nft;
599 signal(SIGINFO29, infohandler);
600 for (lsn = 0; lsn < dir + (o.fat_type == 32 ? bpb.spc : rds); lsn++) {
601 if (got_siginfo) {
602 fprintf(stderr(&__sF[2]),"%s: writing sector %u of %u (%u%%)\n",
603 fname,lsn,(dir + (o.fat_type == 32 ? bpb.spc : rds)),
604 (lsn*100)/(dir + (o.fat_type == 32 ? bpb.spc : rds)));
605 got_siginfo = 0;
606 }
607 x = lsn;
608 if (o.bootstrap &&
609 o.fat_type == 32 && bpb.bkbs != MAXU160xffff &&
610 bss <= bpb.bkbs && x >= bpb.bkbs) {
611 x -= bpb.bkbs;
612 if (!x && lseek(fd1, o.offset, SEEK_SET0)) {
613 warn("%s", bname);
614 return -1;
615 }
616 }
617 if (o.bootstrap && x < bss) {
618 if ((n = read(fd1, img, bpb.bps)) == -1) {
619 warn("%s", bname);
620 return -1;
621 }
622 if ((size_t)n != bpb.bps) {
623 warnx("%s: can't read sector %u", bname, x);
624 return -1;
625 }
626 } else
627 memset(img, 0, bpb.bps);
628 if (!lsn ||
629 (o.fat_type == 32 && bpb.bkbs != MAXU160xffff && lsn == bpb.bkbs)) {
630 x1 = sizeof(struct bs);
631 bsbpb = (struct bsbpb *)(img + x1);
632 mk2(bsbpb->bps, bpb.bps)(bsbpb->bps)[0] = (u_int8_t)(bpb.bps), (bsbpb->bps)[1] =
(u_int8_t)((bpb.bps) >> 010);
633 mk1(bsbpb->spc, bpb.spc)(bsbpb->spc) = (u_int8_t)(bpb.spc);
634 mk2(bsbpb->res, bpb.res)(bsbpb->res)[0] = (u_int8_t)(bpb.res), (bsbpb->res)[1] =
(u_int8_t)((bpb.res) >> 010);
635 mk1(bsbpb->nft, bpb.nft)(bsbpb->nft) = (u_int8_t)(bpb.nft);
636 mk2(bsbpb->rde, bpb.rde)(bsbpb->rde)[0] = (u_int8_t)(bpb.rde), (bsbpb->rde)[1] =
(u_int8_t)((bpb.rde) >> 010);
637 mk2(bsbpb->sec, bpb.sec)(bsbpb->sec)[0] = (u_int8_t)(bpb.sec), (bsbpb->sec)[1] =
(u_int8_t)((bpb.sec) >> 010);
638 mk1(bsbpb->mid, bpb.mid)(bsbpb->mid) = (u_int8_t)(bpb.mid);
639 mk2(bsbpb->spf, bpb.spf)(bsbpb->spf)[0] = (u_int8_t)(bpb.spf), (bsbpb->spf)[1] =
(u_int8_t)((bpb.spf) >> 010);
640 mk2(bsbpb->spt, bpb.spt)(bsbpb->spt)[0] = (u_int8_t)(bpb.spt), (bsbpb->spt)[1] =
(u_int8_t)((bpb.spt) >> 010);
641 mk2(bsbpb->hds, bpb.hds)(bsbpb->hds)[0] = (u_int8_t)(bpb.hds), (bsbpb->hds)[1] =
(u_int8_t)((bpb.hds) >> 010);
642 mk4(bsbpb->hid, bpb.hid)(bsbpb->hid)[0] = (u_int8_t)(bpb.hid), (bsbpb->hid)[1] =
(u_int8_t)((bpb.hid) >> 010), (bsbpb->hid)[2] = (u_int8_t
)((bpb.hid) >> 020), (bsbpb->hid)[3] = (u_int8_t)((bpb
.hid) >> 030);
643 mk4(bsbpb->bsec, bpb.bsec)(bsbpb->bsec)[0] = (u_int8_t)(bpb.bsec), (bsbpb->bsec)[
1] = (u_int8_t)((bpb.bsec) >> 010), (bsbpb->bsec)[2]
= (u_int8_t)((bpb.bsec) >> 020), (bsbpb->bsec)[3] =
(u_int8_t)((bpb.bsec) >> 030);
644 x1 += sizeof(struct bsbpb);
645 if (o.fat_type == 32) {
646 bsxbpb = (struct bsxbpb *)(img + x1);
647 mk4(bsxbpb->bspf, bpb.bspf)(bsxbpb->bspf)[0] = (u_int8_t)(bpb.bspf), (bsxbpb->bspf
)[1] = (u_int8_t)((bpb.bspf) >> 010), (bsxbpb->bspf)
[2] = (u_int8_t)((bpb.bspf) >> 020), (bsxbpb->bspf)[
3] = (u_int8_t)((bpb.bspf) >> 030);
648 mk2(bsxbpb->xflg, 0)(bsxbpb->xflg)[0] = (u_int8_t)(0), (bsxbpb->xflg)[1] = (
u_int8_t)((0) >> 010);
649 mk2(bsxbpb->vers, 0)(bsxbpb->vers)[0] = (u_int8_t)(0), (bsxbpb->vers)[1] = (
u_int8_t)((0) >> 010);
650 mk4(bsxbpb->rdcl, bpb.rdcl)(bsxbpb->rdcl)[0] = (u_int8_t)(bpb.rdcl), (bsxbpb->rdcl
)[1] = (u_int8_t)((bpb.rdcl) >> 010), (bsxbpb->rdcl)
[2] = (u_int8_t)((bpb.rdcl) >> 020), (bsxbpb->rdcl)[
3] = (u_int8_t)((bpb.rdcl) >> 030);
651 mk2(bsxbpb->infs, bpb.infs)(bsxbpb->infs)[0] = (u_int8_t)(bpb.infs), (bsxbpb->infs
)[1] = (u_int8_t)((bpb.infs) >> 010);
652 mk2(bsxbpb->bkbs, bpb.bkbs)(bsxbpb->bkbs)[0] = (u_int8_t)(bpb.bkbs), (bsxbpb->bkbs
)[1] = (u_int8_t)((bpb.bkbs) >> 010);
653 x1 += sizeof(struct bsxbpb);
654 }
655 bsx = (struct bsx *)(img + x1);
656 mk1(bsx->sig, 0x29)(bsx->sig) = (u_int8_t)(0x29);
657 if (o.volume_id_set)
658 x = o.volume_id;
659 else
660 x = (((u_int)(1 + tm->tm_mon) << 8 |
661 (u_int)tm->tm_mday) +
662 ((u_int)tm->tm_sec << 8 |
663 (u_int)(tv.tv_usec / 10))) << 16 |
664 ((u_int)(1900 + tm->tm_year) +
665 ((u_int)tm->tm_hour << 8 |
666 (u_int)tm->tm_min));
667 mk4(bsx->volid, x)(bsx->volid)[0] = (u_int8_t)(x), (bsx->volid)[1] = (u_int8_t
)((x) >> 010), (bsx->volid)[2] = (u_int8_t)((x) >>
020), (bsx->volid)[3] = (u_int8_t)((x) >> 030);
668 mklabel(bsx->label, o.volume_label ? o.volume_label : "NO NAME");
669 snprintf(buf, sizeof(buf), "FAT%u", o.fat_type);
670 setstr(bsx->type, buf, sizeof(bsx->type));
671 if (!o.bootstrap) {
672 x1 += sizeof(struct bsx);
673 bs = (struct bs *)img;
674 mk1(bs->jmp[0], 0xeb)(bs->jmp[0]) = (u_int8_t)(0xeb);
675 mk1(bs->jmp[1], x1 - 2)(bs->jmp[1]) = (u_int8_t)(x1 - 2);
676 mk1(bs->jmp[2], 0x90)(bs->jmp[2]) = (u_int8_t)(0x90);
677 setstr(bs->oem, o.OEM_string ? o.OEM_string : "NetBSD",
678 sizeof(bs->oem));
679 memcpy(img + x1, bootcode, sizeof(bootcode));
680 mk2(img + MINBPS - 2, DOSMAGIC)(img + 512 - 2)[0] = (u_int8_t)(0xaa55), (img + 512 - 2)[1] =
(u_int8_t)((0xaa55) >> 010);
681 }
682 } else if (o.fat_type == 32 && bpb.infs != MAXU160xffff &&
683 (lsn == bpb.infs ||
684 (bpb.bkbs != MAXU160xffff &&
685 lsn == bpb.bkbs + bpb.infs))) {
686 mk4(img, 0x41615252)(img)[0] = (u_int8_t)(0x41615252), (img)[1] = (u_int8_t)((0x41615252
) >> 010), (img)[2] = (u_int8_t)((0x41615252) >> 020
), (img)[3] = (u_int8_t)((0x41615252) >> 030);
687 mk4(img + MINBPS - 28, 0x61417272)(img + 512 - 28)[0] = (u_int8_t)(0x61417272), (img + 512 - 28
)[1] = (u_int8_t)((0x61417272) >> 010), (img + 512 - 28
)[2] = (u_int8_t)((0x61417272) >> 020), (img + 512 - 28
)[3] = (u_int8_t)((0x61417272) >> 030);
688 mk4(img + MINBPS - 24, 0xffffffff)(img + 512 - 24)[0] = (u_int8_t)(0xffffffff), (img + 512 - 24
)[1] = (u_int8_t)((0xffffffff) >> 010), (img + 512 - 24
)[2] = (u_int8_t)((0xffffffff) >> 020), (img + 512 - 24
)[3] = (u_int8_t)((0xffffffff) >> 030);
689 mk4(img + MINBPS - 20, 0xffffffff)(img + 512 - 20)[0] = (u_int8_t)(0xffffffff), (img + 512 - 20
)[1] = (u_int8_t)((0xffffffff) >> 010), (img + 512 - 20
)[2] = (u_int8_t)((0xffffffff) >> 020), (img + 512 - 20
)[3] = (u_int8_t)((0xffffffff) >> 030);
690 mk2(img + MINBPS - 2, DOSMAGIC)(img + 512 - 2)[0] = (u_int8_t)(0xaa55), (img + 512 - 2)[1] =
(u_int8_t)((0xaa55) >> 010);
691 } else if (lsn >= bpb.res && lsn < dir &&
692 !((lsn - bpb.res) %
693 (bpb.spf ? bpb.spf : bpb.bspf))) {
694 mk1(img[0], bpb.mid)(img[0]) = (u_int8_t)(bpb.mid);
695 for (x = 1; x < o.fat_type * (o.fat_type == 32 ? 3U : 2U) / 8U; x++)
696 mk1(img[x], o.fat_type == 32 && x % 4 == 3 ? 0x0f : 0xff)(img[x]) = (u_int8_t)(o.fat_type == 32 && x % 4 == 3 ?
0x0f : 0xff);
697 } else if (lsn == dir && o.volume_label) {
698 de = (struct de *)img;
699 mklabel(de->namext, o.volume_label);
700 mk1(de->attr, 050)(de->attr) = (u_int8_t)(050);
701 x = (u_int)tm->tm_hour << 11 |
702 (u_int)tm->tm_min << 5 |
703 (u_int)tm->tm_sec >> 1;
704 mk2(de->time, x)(de->time)[0] = (u_int8_t)(x), (de->time)[1] = (u_int8_t
)((x) >> 010);
705 x = (u_int)(tm->tm_year - 80) << 9 |
706 (u_int)(tm->tm_mon + 1) << 5 |
707 (u_int)tm->tm_mday;
708 mk2(de->date, x)(de->date)[0] = (u_int8_t)(x), (de->date)[1] = (u_int8_t
)((x) >> 010);
709 }
710 if ((n = write(fd, img, bpb.bps)) == -1) {
711 warn("%s", fname);
712 return -1;
713 }
714 if ((size_t)n != bpb.bps) {
715 warnx("%s: can't write sector %u", fname, lsn);
716 return -1;
717 }
718 }
719 return 0;
720}
721
722
723/*
724 * Get a standard format.
725 */
726static int
727getstdfmt(const char *fmt, struct bpb *bpb)
728{
729 u_int x, i;
730
731 x = sizeof(stdfmt) / sizeof(stdfmt[0]);
732 for (i = 0; i < x && strcmp(fmt, stdfmt[i].name); i++);
733 if (i == x) {
734 warnx("%s: unknown standard format", fmt);
735 return -1;
736 }
737 *bpb = stdfmt[i].bpb;
738 return 0;
739}
740
741/*
742 * Get disk slice, partition, and geometry information.
743 */
744static int
745getbpbinfo(int fd, const char *fname, const char *dtype, int iflag,
746 struct bpb *bpb, int create)
747{
748 const char *s1, *s2;
749 int part;
750
751 part = -1;
752 s1 = fname;
753 if ((s2 = strrchr(s1, '/')))
754 s1 = s2 + 1;
755 for (s2 = s1; *s2 && !isdigit((unsigned char)*s2); s2++);
756 if (!*s2 || s2 == s1)
757 s2 = NULL((void *)0);
758 else
759 while (isdigit((unsigned char)*++s2));
760 s1 = s2;
761
762 if (((part != -1) && ((!iflag && part != -1) || !bpb->bsec)) ||
763 !bpb->bps || !bpb->spt || !bpb->hds) {
764 u_int sector_size;
765 u_int nsectors;
766 u_int ntracks;
767 u_int size;
768 {
769 struct stat st;
770
771 if (fstat(fd, &st) == -1) {
772 warnx("Can't get disk size for `%s'", fname);
773 return -1;
774 }
775 /* create a fake geometry for a file image */
776 sector_size = 512;
777 nsectors = 63;
778 ntracks = 255;
779 size = st.st_size / sector_size;
780 }
781 if (!bpb->bps) {
782 if (ckgeom(fname, sector_size, "bytes/sector") == -1)
783 return -1;
784 bpb->bps = sector_size;
785 }
786
787 if (nsectors > 63) {
788 /*
789 * The kernel doesn't accept BPB with spt > 63.
790 * (see sys/fs/msdosfs/msdosfs_vfsops.c:msdosfs_mountfs())
791 * If values taken from disklabel don't match these
792 * restrictions, use popular BIOS default values instead.
793 */
794 nsectors = 63;
795 }
796 if (!bpb->spt) {
797 if (ckgeom(fname, nsectors, "sectors/track") == -1)
798 return -1;
799 bpb->spt = nsectors;
800 }
801 if (!bpb->hds) {
802 if (ckgeom(fname, ntracks, "drive heads") == -1)
803 return -1;
804 bpb->hds = ntracks;
805 }
806 if (!bpb->bsec)
807 bpb->bsec = size;
808 }
809 return 0;
810}
811
812/*
813 * Print out BPB values.
814 */
815static void
816print_bpb(struct bpb *bpb)
817{
818 printf("bps=%u spc=%u res=%u nft=%u", bpb->bps, bpb->spc, bpb->res,
819 bpb->nft);
820 if (bpb->rde)
821 printf(" rde=%u", bpb->rde);
822 if (bpb->sec)
823 printf(" sec=%u", bpb->sec);
824 printf(" mid=%#x", bpb->mid);
825 if (bpb->spf)
826 printf(" spf=%u", bpb->spf);
827 printf(" spt=%u hds=%u hid=%u", bpb->spt, bpb->hds, bpb->hid);
828 if (bpb->bsec)
829 printf(" bsec=%u", bpb->bsec);
830 if (!bpb->spf) {
831 printf(" bspf=%u rdcl=%u", bpb->bspf, bpb->rdcl);
832 printf(" infs=");
833 printf(bpb->infs == MAXU160xffff ? "%#x" : "%u", bpb->infs);
834 printf(" bkbs=");
835 printf(bpb->bkbs == MAXU160xffff ? "%#x" : "%u", bpb->bkbs);
836 }
837 printf("\n");
838}
839
840/*
841 * Check a disk geometry value.
842 */
843static int
844ckgeom(const char *fname, u_int val, const char *msg)
845{
846 if (!val) {
847 warnx("%s: no default %s", fname, msg);
848 return -1;
849 }
850 if (val > MAXU160xffff) {
851 warnx("%s: illegal %s", fname, msg);
852 return -1;
853 }
854 return 0;
855}
856/*
857 * Check a volume label.
858 */
859static int
860oklabel(const char *src)
861{
862 int c, i;
863
864 for (i = 0; i <= 11; i++) {
865 c = (u_char)*src++;
866 if (c < ' ' + !i || strchr("\"*+,./:;<=>?[\\]|", c))
867 break;
868 }
869 return i && !c;
870}
871
872/*
873 * Make a volume label.
874 */
875static void
876mklabel(u_int8_t *dest, const char *src)
877{
878 int c, i;
879
880 for (i = 0; i < 11; i++) {
881 c = *src ? toupper((unsigned char)*src++) : ' ';
882 *dest++ = !i && c == '\xe5' ? 5 : c;
883 }
884}
885
886/*
887 * Copy string, padding with spaces.
888 */
889static void
890setstr(u_int8_t *dest, const char *src, size_t len)
891{
892 while (len--)
893 *dest++ = *src ? *src++ : ' ';
894}
895
896static void
897infohandler(int sig)
898{
899 got_siginfo = 1;
900}