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
5 * Licensed under GPLv2, see file LICENSE in this source tree.
8 //usage:#define fdformat_trivial_usage
10 //usage:#define fdformat_full_usage "\n\n"
11 //usage: "Format floppy disk\n"
13 //usage: "\n -n Don't verify after format"
18 /* Stuff extracted from linux/fd.h */
19 struct floppy_struct {
20 unsigned int size, /* nr of sectors total */
21 sect, /* sectors per track */
22 head, /* nr of heads */
23 track, /* nr of tracks */
24 stretch; /* !=0 means double track steps */
26 #define FD_SWAPSIDES 2
28 unsigned char gap, /* gap1 size */
30 rate, /* data rate. |= 0x40 for perpendicular */
32 #define FD_SIZECODEMASK 0x38
33 #define FD_SIZECODE(floppy) (((((floppy)->rate&FD_SIZECODEMASK)>> 3)+ 2) %8)
34 #define FD_SECTSIZE(floppy) ( (floppy)->rate & FD_2M ? \
35 512 : 128 << FD_SIZECODE(floppy) )
38 spec1, /* stepping rate, head unload time */
39 fmt_gap; /* gap2 size */
40 const char * name; /* used only for predefined formats */
43 unsigned int device,head,track;
45 #define FDFMTBEG _IO(2,0x47)
46 #define FDFMTTRK _IOW(2,0x48, struct format_descr)
47 #define FDFMTEND _IO(2,0x49)
48 #define FDGETPRM _IOR(2, 0x04, struct floppy_struct)
49 #define FD_FILL_BYTE 0xF6 /* format fill byte. */
51 int fdformat_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
52 int fdformat_main(int argc UNUSED_PARAM, char **argv)
54 int fd, n, cyl, read_bytes, verify;
57 struct floppy_struct param;
58 struct format_descr descr;
60 opt_complementary = "=1"; /* must have 1 param */
61 verify = !getopt32(argv, "n");
65 if (!S_ISBLK(st.st_mode)) {
66 bb_error_msg_and_die("%s: not a block device", *argv);
67 /* do not test major - perhaps this was an USB floppy */
70 /* O_RDWR for formatting and verifying */
71 fd = xopen(*argv, O_RDWR);
73 /* original message was: "Could not determine current format type" */
74 xioctl(fd, FDGETPRM, ¶m);
76 printf("%s-sided, %d tracks, %d sec/track. Total capacity %d kB\n",
77 (param.head == 2) ? "Double" : "Single",
78 param.track, param.sect, param.size >> 1);
81 printf("Formatting... ");
82 xioctl(fd, FDFMTBEG, NULL);
85 for (n = 0; n < param.track; n++) {
88 xioctl(fd, FDFMTTRK, &descr);
89 printf("%3d\b\b\b", n);
90 if (param.head == 2) {
92 xioctl(fd, FDFMTTRK, &descr);
96 xioctl(fd, FDFMTEND, NULL);
102 n = param.sect*param.head*512;
105 printf("Verifying... ");
106 for (cyl = 0; cyl < param.track; cyl++) {
107 printf("%3d\b\b\b", cyl);
108 read_bytes = safe_read(fd, data, n);
109 if (read_bytes != n) {
110 if (read_bytes < 0) {
111 bb_perror_msg(bb_msg_read_error);
113 bb_error_msg_and_die("problem reading cylinder %d, "
114 "expected %d, read %d", cyl, n, read_bytes);
115 // FIXME: maybe better seek & continue??
117 /* Check backwards so we don't need a counter */
118 while (--read_bytes >= 0) {
119 if (data[read_bytes] != FD_FILL_BYTE) {
120 printf("bad data in cyl %d\nContinuing... ", cyl);
124 /* There is no point in freeing blocks at the end of a program, because
125 all of the program's space is given back to the system when the process
128 if (ENABLE_FEATURE_CLEAN_UP) free(data);
133 if (ENABLE_FEATURE_CLEAN_UP) close(fd);
135 /* Don't bother closing. Exit does
136 * that, so we can save a few bytes */