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