release/src/router/busybox/util-linux/fdformat.c

   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, &param);
  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 }