executor/util/makereferencefloppy.c

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#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <fcntl.h>
#define BLOCK_SIZE 512
/* Fills each sector with the two byte sector number, stored in big endian
* byte order. Specify the device you want to use on the command line,
* or "-" for stdout.
*/
int
main (int argc, char *argv[])
{
int sec, fd;
if (argc != 2)
{
fprintf (stderr, "Usage: %s device\n", argv[0]);
exit (-1);
}
if (!strcmp (argv[1], "-"))
fd = fileno (stdout);
else
{
fd = open (argv[1], O_WRONLY);
if (fd < 0)
{
perror (argv[1]);
exit (-2);
}
}
for (sec = 0; ; sec++)
{
unsigned char buf[BLOCK_SIZE];
int i;
for (i = 0; i < BLOCK_SIZE; i += 2)
{
buf[i] = (sec >> 8);
buf[i + 1] = sec;
}
if (write (fd, buf, sizeof buf) <= 0)
break;
}
close (fd);
printf ("%d sectors written (%.02f MB)\n",
sec, sec * BLOCK_SIZE / (1024.0 * 1024));
return EXIT_SUCCESS;
}