Disable HFS Journaling

#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <sys/types.h>
#include <sys/mman.h>
#include <fcntl.h>



int main(int argc, char *argv[])
{
    int fd = open(argv[1], O_RDWR);
    if(fd < 0) {
        perror("open");
        return -1;
    }

    unsigned char *buffer = (unsigned char *)mmap(NULL, 2048, PROT_READ|PROT_WRITE, MAP_SHARED, fd, 0);
    if(buffer == (unsigned char*)0xffffffff) {
        perror("mmap");
        return -1;
    }

    if((buffer[1024] != 'H') && (buffer[1025] != '+')) {
        fprintf(stderr, "%s: HFS+ signature not found -- aborting.\n", argv[0]);
        return -1;
    }

    unsigned long attributes = *(unsigned long *)(&buffer[1028]);
    attributes = bswap_32(attributes);
    printf("attributes = 0x%8.8x\n", attributes);

    if(!(attributes & 0x00002000)) {
        printf("kHFSVolumeJournaledBit not currently set in the volume attributes field.\n");
    }

    attributes &= 0xffffdfff;
    attributes = bswap_32(attributes);
    *(unsigned long *)(&buffer[1028]) = attributes;

    buffer[1032] = '1';
    buffer[1033] = '0';
    buffer[1034] = '.';
    buffer[1035] = '0';

    buffer[1036] = 0;
    buffer[1037] = 0;
    buffer[1038] = 0;
    buffer[1039] = 0;

    printf("journal has been disabled.\n");
    return 0;
}