minix/commands/devsize/devsize.c
Ben Gras f984dbba70 increase system-wide filename limit to 255
. move mfs-specific struct, constants to mfs/, so
	  mfs-specific, on-disk format structs and consts are
	  fully isolated from generic structs and functions
	. removes de and readfs utils
2011-08-17 16:00:01 +00:00

53 lines
898 B
C

/* Ben Gras
*
* Based on sizeup() in mkfs.c.
*/
#include <sys/types.h>
#include <sys/stat.h>
#include <machine/partition.h>
#include <minix/partition.h>
#include <minix/u64.h>
#include <sys/ioc_disk.h>
#include <stdio.h>
#include <errno.h>
#include <fcntl.h>
#include <limits.h>
#include <stdlib.h>
#include <string.h>
#include <time.h>
#include <unistd.h>
unsigned long sizeup(char *);
int main(int argc, char *argv[])
{
if(argc != 2) {
fprintf(stderr, "Usage: %s <device>\n", argv[0]);
return 1;
}
printf("%lu\n", sizeup(argv[1]));
return 0;
}
unsigned long sizeup(device)
char *device;
{
int fd;
struct partition entry;
unsigned long d;
if ((fd = open(device, O_RDONLY)) == -1) {
perror("sizeup open");
exit(1);
}
if (ioctl(fd, DIOCGETP, &entry) == -1) {
perror("sizeup ioctl");
exit(1);
}
close(fd);
d = div64u(entry.size, 512);
return d;
}