source: MondoRescue/branches/2.2.5/mindi-busybox/util-linux/fdformat.c@ 1533

/* fdformat.c  -  Low-level formats a floppy disk - Werner Almesberger */

/* 1999-02-22 Arkadiusz Mi¶kiewicz <misiek@pld.ORG.PL>
 * - added Native Language Support
 * 1999-03-20 Arnaldo Carvalho de Melo <acme@conectiva.com.br>
 * - more i18n/nls translatable strings marked
 *
 * 5 July 2003 -- modified for Busybox by Erik Andersen
 */

#include <stdio.h>
#include <string.h>
#include <fcntl.h>
#include <errno.h>
#include <unistd.h>
#include <stdlib.h>
#include <sys/stat.h>
#include <sys/ioctl.h>
#include "busybox.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. */

static void print_and_flush(const char * __restrict format, ...)
{
    va_list arg;

    va_start(arg, format);
    bb_vfprintf(stdout, format, arg);
    va_end(arg);
    bb_xfflush_stdout();
}

static void bb_xioctl(int fd, int request, void *argp, const char *string)
{
    if (ioctl (fd, request, argp) < 0) {
        bb_perror_msg_and_die(string);
    }
}

int fdformat_main(int argc,char **argv)
{
    int fd, n, cyl, read_bytes, verify;
    unsigned char *data;
    struct stat st;
    struct floppy_struct param;
    struct format_descr descr;

    if (argc < 2) {
        bb_show_usage();
    }
    verify = !bb_getopt_ulflags(argc, argv, "n");
    argv += optind;

    /* R_OK is needed for verifying */
    if (stat(*argv,&st) < 0 || access(*argv,W_OK | R_OK ) < 0) {
        bb_perror_msg_and_die("%s",*argv);
    }
    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 = bb_xopen(*argv,O_RDWR );

    bb_xioctl(fd, FDGETPRM, &param, "FDGETPRM");/*original message was: "Could not determine current format type" */

    print_and_flush("%s-sided, %d tracks, %d sec/track. Total capacity %d kB.\n",
        (param.head == 2) ? "Double" : "Single",
        param.track, param.sect, param.size >> 1);

    /* FORMAT */
    print_and_flush("Formatting ... ", NULL);
    bb_xioctl(fd, FDFMTBEG,NULL,"FDFMTBEG");

    /* n == track */
    for (n = 0; n < param.track; n++)
    {
        descr.head = 0;
        descr.track = n;
        bb_xioctl(fd, FDFMTTRK,&descr,"FDFMTTRK");
        print_and_flush("%3d\b\b\b", n);
        if (param.head == 2) {
        descr.head = 1;
        bb_xioctl(fd, FDFMTTRK,&descr,"FDFMTTRK");
        }
    }

    bb_xioctl(fd,FDFMTEND,NULL,"FDFMTEND");
    print_and_flush("done\n", NULL);

    /* VERIFY */
    if(verify) {
        /* n == cyl_size */
        n = param.sect*param.head*512;

        data = xmalloc(n);
        print_and_flush("Verifying ... ", NULL);
        for (cyl = 0; cyl < param.track; cyl++) {
            print_and_flush("%3d\b\b\b", cyl);
            if((read_bytes = safe_read(fd,data,n))!= 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);
            }
            /* Check backwards so we don't need a counter */
            while(--read_bytes>=0) {
                if( data[read_bytes] != FD_FILL_BYTE) {
                     print_and_flush("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);

        print_and_flush("done\n", NULL);
    }

    if (ENABLE_FEATURE_CLEAN_UP) close(fd);

    /* Don't bother closing.  Exit does
     * that, so we can save a few bytes */
    return EXIT_SUCCESS;
}