int
get_nv_params()
{
int e;
NV_FILE * fp;
/* Just in case Demo Applications want to parse webport.nv again */
netidx = -1; /* reset index of nets[] to configure */
/* invoke the generic parm reader to get TCP/IP system parameters */
e = get_file_parms(nvfilename, nv_formats, &line);
if (e == ENP_NOFILE)
{
printf("Creating sample file\n");
fp = nv_fopen(nvfilename, "w+");
if (fp)
{
if (set_nv_defaults) /* see if app wants to init defaults */
set_nv_defaults();
set_nv_params(NULL); /* write defaults to new file */
/* now try again from the flash file we just set up */
e = get_file_parms(nvfilename, nv_formats, &line);
}
else
printf("Can't create sample file either.\n");
}
return(e);
}
/*
* Fetch disklabel for disk.
*/
static int
readlabel(int flag)
{
ssize_t nbytes;
uint32_t lba;
int f, i;
int error;
f = open(specname, O_RDONLY);
if (f < 0)
err(1, "%s", specname);
if (is_file)
get_file_parms(f);
else {
mediasize = g_mediasize(f);
secsize = g_sectorsize(f);
if (secsize < 0 || mediasize < 0)
err(4, "cannot get disk geometry");
}
if (mediasize > (off_t)0xffffffff * secsize)
errx(1,
"disks with more than 2^32-1 sectors are not supported");
(void)lseek(f, (off_t)0, SEEK_SET);
nbytes = read(f, bootarea, BBSIZE);
if (nbytes == -1)
err(4, "%s read", specname);
if (nbytes != BBSIZE)
errx(4, "couldn't read %d bytes from %s", BBSIZE, specname);
close (f);
error = bsd_disklabel_le_dec(
bootarea + (labeloffset + labelsoffset * secsize),
&lab, MAXPARTITIONS);
if (flag && error)
errx(1, "%s: no valid label found", specname);
if (is_file)
return(0);
/*
* Compensate for absolute block addressing by finding the
* smallest partition offset and if the offset of the 'c'
* partition is equal to that, subtract it from all offsets.
*/
lba = ~0;
for (i = 0; i < lab.d_npartitions; i++) {
if (lab.d_partitions[i].p_size)
lba = MIN(lba, lab.d_partitions[i].p_offset);
}
if (lba != 0 && lab.d_partitions[RAW_PART].p_offset == lba) {
for (i = 0; i < lab.d_npartitions; i++) {
if (lab.d_partitions[i].p_size)
lab.d_partitions[i].p_offset -= lba;
}
/*
* Save the offset so that we can write the label
* back with absolute block addresses.
*/
lba_offset = lba;
}
return (error);
}
/*
* When operating on a "virgin" disk, try getting an initial label
* from the associated device driver. This might work for all device
* drivers that are able to fetch some initial device parameters
* without even having access to a (BSD) disklabel, like SCSI disks,
* most IDE drives, or vn devices.
*
* The device name must be given in its "canonical" form.
*/
static struct disklabel *
getvirginlabel(void)
{
static struct disklabel loclab;
struct partition *dp;
int f;
u_int u;
if ((f = open(specname, O_RDONLY)) == -1) {
warn("cannot open %s", specname);
return (NULL);
}
if (is_file)
get_file_parms(f);
else {
mediasize = g_mediasize(f);
secsize = g_sectorsize(f);
if (secsize < 0 || mediasize < 0) {
close (f);
return (NULL);
}
}
memset(&loclab, 0, sizeof loclab);
loclab.d_magic = DISKMAGIC;
loclab.d_magic2 = DISKMAGIC;
loclab.d_secsize = secsize;
loclab.d_secperunit = mediasize / secsize;
/*
* Nobody in these enlightened days uses the CHS geometry for
* anything, but nonetheless try to get it right. If we fail
* to get any good ideas from the device, construct something
* which is IBM-PC friendly.
*/
if (ioctl(f, DIOCGFWSECTORS, &u) == 0)
loclab.d_nsectors = u;
else
loclab.d_nsectors = 63;
if (ioctl(f, DIOCGFWHEADS, &u) == 0)
loclab.d_ntracks = u;
else if (loclab.d_secperunit <= 63*1*1024)
loclab.d_ntracks = 1;
else if (loclab.d_secperunit <= 63*16*1024)
loclab.d_ntracks = 16;
else
loclab.d_ntracks = 255;
loclab.d_secpercyl = loclab.d_ntracks * loclab.d_nsectors;
loclab.d_ncylinders = loclab.d_secperunit / loclab.d_secpercyl;
loclab.d_npartitions = DEFPARTITIONS;
/* Various (unneeded) compat stuff */
loclab.d_rpm = 3600;
loclab.d_bbsize = BBSIZE;
loclab.d_interleave = 1;
strncpy(loclab.d_typename, "amnesiac",
sizeof(loclab.d_typename));
dp = &loclab.d_partitions[RAW_PART];
dp->p_size = loclab.d_secperunit;
loclab.d_checksum = dkcksum(&loclab);
close (f);
return (&loclab);
}