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 source tree.
   6  */
   7
   8 //usage:#define fdformat_trivial_usage
   9 //usage:       "[-n] DEVICE"
  10 //usage:#define fdformat_full_usage "\n\n"
  11 //usage:       "Format floppy disk\n"
  12 //usage:     "\n        -n      Don't verify after format"
  13
  14 #include "libbb.h"
  15
  16
  17 /* Stuff extracted from linux/fd.h */
  18 struct floppy_struct {
  19         unsigned int    size,           /* nr of sectors total */
  20                         sect,           /* sectors per track */
  21                         head,           /* nr of heads */
  22                         track,          /* nr of tracks */
  23                         stretch;        /* !=0 means double track steps */
  24 #define FD_STRETCH 1
  25 #define FD_SWAPSIDES 2
  26
  27         unsigned char   gap,            /* gap1 size */
  28
  29                         rate,           /* data rate. |= 0x40 for perpendicular */
  30 #define FD_2M 0x4
  31 #define FD_SIZECODEMASK 0x38
  32 #define FD_SIZECODE(floppy) (((((floppy)->rate&FD_SIZECODEMASK)>> 3)+ 2) %8)
  33 #define FD_SECTSIZE(floppy) ( (floppy)->rate & FD_2M ? \
  34                              512 : 128 << FD_SIZECODE(floppy) )
  35 #define FD_PERP 0x40
  36
  37                         spec1,          /* stepping rate, head unload time */
  38                         fmt_gap;        /* gap2 size */
  39         const char      * name; /* used only for predefined formats */
  40 };
  41 struct format_descr {
  42         unsigned int device,head,track;
  43 };
  44 #define FDFMTBEG _IO(2,0x47)
  45 #define FDFMTTRK _IOW(2,0x48, struct format_descr)
  46 #define FDFMTEND _IO(2,0x49)
  47 #define FDGETPRM _IOR(2, 0x04, struct floppy_struct)
  48 #define FD_FILL_BYTE 0xF6 /* format fill byte. */
  49
  50 int fdformat_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
  51 int fdformat_main(int argc UNUSED_PARAM, char **argv)
  52 {
  53         int fd, n, cyl, read_bytes, verify;
  54         unsigned char *data;
  55         struct stat st;
  56         struct floppy_struct param;
  57         struct format_descr descr;
  58
  59         opt_complementary = "=1"; /* must have 1 param */
  60         verify = !getopt32(argv, "n");
  61         argv += optind;
  62
  63         xstat(*argv, &st);
  64         if (!S_ISBLK(st.st_mode)) {
  65                 bb_error_msg_and_die("%s: not a block device", *argv);
  66                 /* do not test major - perhaps this was an USB floppy */
  67         }
  68
  69         /* O_RDWR for formatting and verifying */
  70         fd = xopen(*argv, O_RDWR);
  71
  72         /* original message was: "Could not determine current format type" */
  73         xioctl(fd, FDGETPRM, &param);
  74
  75         printf("%s-sided, %d tracks, %d sec/track. Total capacity %d kB\n",
  76                 (param.head == 2) ? "Double" : "Single",
  77                 param.track, param.sect, param.size >> 1);
  78
  79         /* FORMAT */
  80         printf("Formatting... ");
  81         xioctl(fd, FDFMTBEG, NULL);
  82
  83         /* n == track */
  84         for (n = 0; n < param.track; n++) {
  85                 descr.head = 0;
  86                 descr.track = n;
  87                 xioctl(fd, FDFMTTRK, &descr);
  88                 printf("%3d\b\b\b", n);
  89                 if (param.head == 2) {
  90                         descr.head = 1;
  91                         xioctl(fd, FDFMTTRK, &descr);
  92                 }
  93         }
  94
  95         xioctl(fd, FDFMTEND, NULL);
  96         printf("done\n");
  97
  98         /* VERIFY */
  99         if (verify) {
 100                 /* n == cyl_size */
 101                 n = param.sect*param.head*512;
 102
 103                 data = xmalloc(n);
 104                 printf("Verifying... ");
 105                 for (cyl = 0; cyl < param.track; cyl++) {
 106                         printf("%3d\b\b\b", cyl);
 107                         read_bytes = safe_read(fd, data, n);
 108                         if (read_bytes != n) {
 109                                 if (read_bytes < 0) {
 110                                         bb_perror_msg(bb_msg_read_error);
 111                                 }
 112                                 bb_error_msg_and_die("problem reading cylinder %d, "
 113                                         "expected %d, read %d", cyl, n, read_bytes);
 114                                 // FIXME: maybe better seek & continue??
 115                         }
 116                         /* Check backwards so we don't need a counter */
 117                         while (--read_bytes >= 0) {
 118                                 if (data[read_bytes] != FD_FILL_BYTE) {
 119                                         printf("bad data in cyl %d\nContinuing... ", cyl);
 120                                 }
 121                         }
 122                 }
 123                 /* There is no point in freeing blocks at the end of a program, because
 124                 all of the program's space is given back to the system when the process
 125                 terminates.*/
 126
 127                 if (ENABLE_FEATURE_CLEAN_UP) free(data);
 128
 129                 printf("done\n");
 130         }
 131
 132         if (ENABLE_FEATURE_CLEAN_UP) close(fd);
 133
 134         /* Don't bother closing.  Exit does
 135          * that, so we can save a few bytes */
 136         return EXIT_SUCCESS;
 137 }