Contents of /trunk/mkinitrd-magellan/busybox/util-linux/fdformat.c
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Sun May 30 11:32:42 2010 UTC (14 years, 4 months ago) by niro
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Sun May 30 11:32:42 2010 UTC (14 years, 4 months ago) by niro
File MIME type: text/plain
File size: 3580 byte(s)
-updated to busybox-1.16.1 and enabled blkid/uuid support in default config
1 | /* vi: set sw=4 ts=4: */ |
2 | /* fdformat.c - Low-level formats a floppy disk - Werner Almesberger |
3 | * 5 July 2003 -- modified for Busybox by Erik Andersen |
4 | * |
5 | * Licensed under GPLv2, see file LICENSE in this tarball for details. |
6 | */ |
7 | |
8 | #include "libbb.h" |
9 | |
10 | |
11 | /* Stuff extracted from linux/fd.h */ |
12 | struct floppy_struct { |
13 | unsigned int size, /* nr of sectors total */ |
14 | sect, /* sectors per track */ |
15 | head, /* nr of heads */ |
16 | track, /* nr of tracks */ |
17 | stretch; /* !=0 means double track steps */ |
18 | #define FD_STRETCH 1 |
19 | #define FD_SWAPSIDES 2 |
20 | |
21 | unsigned char gap, /* gap1 size */ |
22 | |
23 | rate, /* data rate. |= 0x40 for perpendicular */ |
24 | #define FD_2M 0x4 |
25 | #define FD_SIZECODEMASK 0x38 |
26 | #define FD_SIZECODE(floppy) (((((floppy)->rate&FD_SIZECODEMASK)>> 3)+ 2) %8) |
27 | #define FD_SECTSIZE(floppy) ( (floppy)->rate & FD_2M ? \ |
28 | 512 : 128 << FD_SIZECODE(floppy) ) |
29 | #define FD_PERP 0x40 |
30 | |
31 | spec1, /* stepping rate, head unload time */ |
32 | fmt_gap; /* gap2 size */ |
33 | const char * name; /* used only for predefined formats */ |
34 | }; |
35 | struct format_descr { |
36 | unsigned int device,head,track; |
37 | }; |
38 | #define FDFMTBEG _IO(2,0x47) |
39 | #define FDFMTTRK _IOW(2,0x48, struct format_descr) |
40 | #define FDFMTEND _IO(2,0x49) |
41 | #define FDGETPRM _IOR(2, 0x04, struct floppy_struct) |
42 | #define FD_FILL_BYTE 0xF6 /* format fill byte. */ |
43 | |
44 | int fdformat_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE; |
45 | int fdformat_main(int argc UNUSED_PARAM, char **argv) |
46 | { |
47 | int fd, n, cyl, read_bytes, verify; |
48 | unsigned char *data; |
49 | struct stat st; |
50 | struct floppy_struct param; |
51 | struct format_descr descr; |
52 | |
53 | opt_complementary = "=1"; /* must have 1 param */ |
54 | verify = !getopt32(argv, "n"); |
55 | argv += optind; |
56 | |
57 | xstat(*argv, &st); |
58 | if (!S_ISBLK(st.st_mode)) { |
59 | bb_error_msg_and_die("%s: not a block device", *argv); |
60 | /* do not test major - perhaps this was an USB floppy */ |
61 | } |
62 | |
63 | /* O_RDWR for formatting and verifying */ |
64 | fd = xopen(*argv, O_RDWR); |
65 | |
66 | /* original message was: "Could not determine current format type" */ |
67 | xioctl(fd, FDGETPRM, ¶m); |
68 | |
69 | printf("%s-sided, %d tracks, %d sec/track. Total capacity %d kB\n", |
70 | (param.head == 2) ? "Double" : "Single", |
71 | param.track, param.sect, param.size >> 1); |
72 | |
73 | /* FORMAT */ |
74 | printf("Formatting... "); |
75 | xioctl(fd, FDFMTBEG, NULL); |
76 | |
77 | /* n == track */ |
78 | for (n = 0; n < param.track; n++) { |
79 | descr.head = 0; |
80 | descr.track = n; |
81 | xioctl(fd, FDFMTTRK, &descr); |
82 | printf("%3d\b\b\b", n); |
83 | if (param.head == 2) { |
84 | descr.head = 1; |
85 | xioctl(fd, FDFMTTRK, &descr); |
86 | } |
87 | } |
88 | |
89 | xioctl(fd, FDFMTEND, NULL); |
90 | printf("done\n"); |
91 | |
92 | /* VERIFY */ |
93 | if (verify) { |
94 | /* n == cyl_size */ |
95 | n = param.sect*param.head*512; |
96 | |
97 | data = xmalloc(n); |
98 | printf("Verifying... "); |
99 | for (cyl = 0; cyl < param.track; cyl++) { |
100 | printf("%3d\b\b\b", cyl); |
101 | read_bytes = safe_read(fd, data, n); |
102 | if (read_bytes != n) { |
103 | if (read_bytes < 0) { |
104 | bb_perror_msg(bb_msg_read_error); |
105 | } |
106 | bb_error_msg_and_die("problem reading cylinder %d, " |
107 | "expected %d, read %d", cyl, n, read_bytes); |
108 | // FIXME: maybe better seek & continue?? |
109 | } |
110 | /* Check backwards so we don't need a counter */ |
111 | while (--read_bytes >= 0) { |
112 | if (data[read_bytes] != FD_FILL_BYTE) { |
113 | printf("bad data in cyl %d\nContinuing... ", cyl); |
114 | } |
115 | } |
116 | } |
117 | /* There is no point in freeing blocks at the end of a program, because |
118 | all of the program's space is given back to the system when the process |
119 | terminates.*/ |
120 | |
121 | if (ENABLE_FEATURE_CLEAN_UP) free(data); |
122 | |
123 | printf("done\n"); |
124 | } |
125 | |
126 | if (ENABLE_FEATURE_CLEAN_UP) close(fd); |
127 | |
128 | /* Don't bother closing. Exit does |
129 | * that, so we can save a few bytes */ |
130 | return EXIT_SUCCESS; |
131 | } |