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/* vi: set sw=4 ts=4: */
/* fdformat.c - Low-level formats a floppy disk - Werner Almesberger
* 5 July 2003 -- modified for Busybox by Erik Andersen
*
* Licensed under GPLv2, see file LICENSE in this source tree.
*/
//config:config FDFORMAT
//config: bool "fdformat (4.5 kb)"
//config: default y
//config: select PLATFORM_LINUX
//config: help
//config: fdformat is used to low-level format a floppy disk.
//applet:IF_FDFORMAT(APPLET(fdformat, BB_DIR_USR_SBIN, BB_SUID_DROP))
//kbuild:lib-$(CONFIG_FDFORMAT) += fdformat.o
//usage:#define fdformat_trivial_usage
//usage: "[-n] DEVICE"
//usage:#define fdformat_full_usage "\n\n"
//usage: "Format floppy disk\n"
//usage: "\n -n Don't verify after format"
#include "libbb.h"
/* Stuff extracted from linux/fd.h */
struct floppy_struct {
unsigned int size, /* nr of sectors total */
sect, /* sectors per track */
head, /* nr of heads */
track, /* nr of tracks */
stretch; /* !=0 means double track steps */
#define FD_STRETCH 1
#define FD_SWAPSIDES 2
unsigned char gap, /* gap1 size */
rate, /* data rate. |= 0x40 for perpendicular */
#define FD_2M 0x4
#define FD_SIZECODEMASK 0x38
#define FD_SIZECODE(floppy) (((((floppy)->rate&FD_SIZECODEMASK)>> 3)+ 2) %8)
#define FD_SECTSIZE(floppy) ( (floppy)->rate & FD_2M ? \
512 : 128 << FD_SIZECODE(floppy) )
#define FD_PERP 0x40
spec1, /* stepping rate, head unload time */
fmt_gap; /* gap2 size */
const char * name; /* used only for predefined formats */
};
struct format_descr {
unsigned int device,head,track;
};
#define FDFMTBEG _IO(2,0x47)
#define FDFMTTRK _IOW(2,0x48, struct format_descr)
#define FDFMTEND _IO(2,0x49)
#define FDGETPRM _IOR(2, 0x04, struct floppy_struct)
#define FD_FILL_BYTE 0xF6 /* format fill byte. */
int fdformat_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
int fdformat_main(int argc UNUSED_PARAM, char **argv)
{
int fd, n, cyl, read_bytes, verify;
unsigned char *data;
struct stat st;
struct floppy_struct param;
struct format_descr descr;
opt_complementary = "=1"; /* must have 1 param */
verify = !getopt32(argv, "n");
argv += optind;
xstat(*argv, &st);
if (!S_ISBLK(st.st_mode)) {
bb_error_msg_and_die("%s: not a block device", *argv);
/* do not test major - perhaps this was an USB floppy */
}
/* O_RDWR for formatting and verifying */
fd = xopen(*argv, O_RDWR);
/* original message was: "Could not determine current format type" */
xioctl(fd, FDGETPRM, ¶m);
printf("%s-sided, %u tracks, %u sec/track. Total capacity %d kB\n",
(param.head == 2) ? "Double" : "Single",
param.track, param.sect, param.size >> 1);
/* FORMAT */
printf("Formatting... ");
xioctl(fd, FDFMTBEG, NULL);
/* n == track */
for (n = 0; n < param.track; n++) {
descr.head = 0;
descr.track = n;
xioctl(fd, FDFMTTRK, &descr);
printf("%3d\b\b\b", n);
if (param.head == 2) {
descr.head = 1;
xioctl(fd, FDFMTTRK, &descr);
}
}
xioctl(fd, FDFMTEND, NULL);
puts("Done");
/* VERIFY */
if (verify) {
/* n == cyl_size */
n = param.sect*param.head*512;
data = xmalloc(n);
printf("Verifying... ");
for (cyl = 0; cyl < param.track; cyl++) {
printf("%3d\b\b\b", cyl);
read_bytes = safe_read(fd, data, n);
if (read_bytes != n) {
if (read_bytes < 0) {
bb_perror_msg(bb_msg_read_error);
}
bb_error_msg_and_die("problem reading cylinder %d, "
"expected %d, read %d", cyl, n, read_bytes);
// FIXME: maybe better seek & continue??
}
/* Check backwards so we don't need a counter */
while (--read_bytes >= 0) {
if (data[read_bytes] != FD_FILL_BYTE) {
printf("bad data in cyl %d\nContinuing... ", cyl);
}
}
}
/* There is no point in freeing blocks at the end of a program, because
all of the program's space is given back to the system when the process
terminates.*/
if (ENABLE_FEATURE_CLEAN_UP) free(data);
puts("Done");
}
if (ENABLE_FEATURE_CLEAN_UP) close(fd);
/* Don't bother closing. Exit does
* that, so we can save a few bytes */
return EXIT_SUCCESS;
}
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