static void
partition(int fd, int bsize, Header *h)
{
ulong nblock, ndata, nlabel;
ulong lpb;
if(bsize % 512 != 0)
sysfatal("block size must be a multiple of 512 bytes");
if(bsize > VtMaxLumpSize)
sysfatal("block size must be less than %d", VtMaxLumpSize);
memset(h, 0, sizeof(*h));
h->blockSize = bsize;
lpb = bsize/LabelSize;
nblock = fdsize(fd)/bsize;
/* sanity check */
if(nblock < (HeaderOffset*10)/bsize)
vtFatal("file too small");
h->super = (HeaderOffset + 2*bsize)/bsize;
h->label = h->super + 1;
ndata = ((u64int)lpb)*(nblock - h->label)/(lpb+1);
nlabel = (ndata + lpb - 1)/lpb;
h->data = h->label + nlabel;
h->end = h->data + ndata;
}
int main(int argc, char *argv[]) {
if (argc < 2) {
fprintf(stderr, "usage: %s file.ldif\n", argv[0]);
return 1;
}
char *ldif_fn = argv[1];
int fd = open(ldif_fn, O_RDONLY);
if (fd < 0) {
fprintf(stderr, "Unable to open %s: %s\n", ldif_fn, strerror(errno));
exit(1);
}
size_t ldif_len = fdsize(fd);
if (ldif_len == 0) {
puts("0");
goto close;
}
void *ldif_mm = mmap(0, ldif_len, PROT_READ, MAP_FILE | MAP_NOCACHE | MAP_SHARED, fd, 0);
if (MAP_FAILED == ldif_mm) {
fprintf(stderr, "Unable to memory map %s: %s\n", ldif_fn, strerror(errno));
exit(2);
}
// size_t num_newlines = count_newlines(ldif_mm, ldif_len);
// printf("%llu\n", (unsigned long long)num_newlines);
dump_cns(ldif_mm, ldif_len);
munmap(ldif_mm, ldif_len);
close: close(fd);
}
