int open_bvdev(const char *bvd, const char *path, int flags)
{
const struct devsw *dp;
const char *cp;
BVRef bvr;
int i;
int len;
int unit;
int partition;
if ((i = open(path, flags)) >= 0) {
return i;
}
if (bvd == NULL || (len = strlen(bvd)) < 2) {
return -1;
}
for (dp=devsw; dp->name; dp++) {
if (bvd[0] == dp->name[0] && bvd[1] == dp->name[1]) {
unit = 0;
partition = 0;
/* get optional unit and partition */
if (len >= 5 && bvd[2] == '(') { /* min must be present xx(0) */
cp = &bvd[3];
i = 0;
while ((cp - path) < len && isdigit(*cp)) {
i = i * 10 + *cp++ - '0';
unit = i;
}
if (*cp++ == ',') {
i = 0;
while ((cp - path) < len && isdigit(*cp)) {
i = i * 10 + *cp++ - '0';
partition = i;
}
}
}
// turbo - bt(0,0) hook
if ((dp->biosdev + unit) == 0x101) {
// zef - use the ramdisk if available and the alias is active.
if (gRAMDiskVolume != NULL && gRAMDiskBTAliased) {
bvr = gRAMDiskVolume;
} else {
bvr = gBIOSBootVolume;
}
} else {
bvr = newBootVolumeRef(dp->biosdev + unit, partition);
}
return open_bvr(bvr, path, flags);
}
}
return -1;
}
int open_bvdev(const char *bvd, const char *path, int flags)
{
const struct devsw *dp;
const char *cp;
BVRef bvr;
int i;
int len;
int unit;
int partition;
if ((i = open(path, flags)) >= 0)
{
return i;
}
if (bvd == NULL || (len = strlen(bvd)) < 2)
{
return -1;
}
for (dp=devsw; dp->name; dp++)
{
if (bvd[0] == dp->name[0] && bvd[1] == dp->name[1])
{
unit = 0;
partition = 0;
/* get optional unit and partition */
if (len >= 5 && bvd[2] == '(') { /* min must be present xx(0) */
cp = &bvd[3];
i = 0;
while ((cp - path) < len && isdigit(*cp))
{
i = i * 10 + *cp++ - '0';
unit = i;
}
if (*cp++ == ',')
{
i = 0;
while ((cp - path) < len && isdigit(*cp))
{
i = i * 10 + *cp++ - '0';
partition = i;
}
}
}
bvr = newBootVolumeRef(dp->biosdev + unit, partition);
return open_bvr(bvr, path, flags);
}
}
return -1;
}
/*!
Extracts the volume selector from the pathname, returns the selected
BVRef, and sets *outPath to the remainder of the path.
If the path did not include a volume selector then the current volume
is used. When called with a volume selector the current volume
is changed to the selected volume unless the volume selector is
that of a ramdisk.
*/
BVRef getBootVolumeRef( const char * path, const char ** outPath )
{
const char * cp;
BVRef bvr = gRootVolume;
int biosdev = gBIOSDev;
// Search for left parenthesis in the path specification.
for (cp = path; *cp; cp++) {
if (*cp == LP || *cp == '/') break;
}
if (*cp != LP) // no left paren found
{
// Path is using the implicit current device so if there is
// no current device, then we must fail.
cp = path;
if ( gRootVolume == NULL )
return NULL;
}
else if ((cp - path) == 2) // found "xx("
{
const struct devsw * dp;
const char * xp = path;
int i;
int unit = -1;
int part = -1;
cp++;
// Check the 2 character device name pointed by 'xp'.
for (dp = devsw; dp->name; dp++)
{
if ((xp[0] == dp->name[0]) && (xp[1] == dp->name[1]))
break; // found matching entry
}
if (dp->name == NULL)
{
error("Unknown device '%c%c'\n", xp[0], xp[1]);
return NULL;
}
// Extract the optional unit number from the specification.
// hd(unit) or hd(unit, part).
i = 0;
while (*cp >= '0' && *cp <= '9')
{
i = i * 10 + *cp++ - '0';
unit = i;
}
// Unit is no longer optional and never really was.
// If the user failed to specify it then the unit number from the previous kernDev
// would have been used which makes little sense anyway.
// For example, if the user did fd()/foobar and the current root device was the
// second hard disk (i.e. unit 1) then fd() would select the second floppy drive!
if(unit == -1)
return NULL;
// Extract the optional partition number from the specification.
if (*cp == ',')
part = atoi(++cp);
// If part is not specified part will be -1 whereas before it would have been
// whatever the last partition was which makes about zero sense if the device
// has been switched.
// Skip past the right paren.
for ( ; *cp && *cp != RP; cp++) /* LOOP */;
if (*cp == RP) cp++;
biosdev = dp->biosdev + unit;
// turbo - bt(0,0) hook
if (biosdev == 0x101)
{
// zef - use the ramdisk if available and the alias is active.
if (gRAMDiskVolume != NULL && gRAMDiskBTAliased)
bvr = gRAMDiskVolume;
else
bvr = gBIOSBootVolume;
}
else
{
bvr = newBootVolumeRef(biosdev, part);
}
if(bvr == NULL)
return NULL;
}
else
{
// Bad device specifier, skip past the right paren.
for ( cp++; *cp && *cp != RP; cp++) /* LOOP */;
if (*cp == RP) cp++;
// If gRootVolume was NULL, then bvr will be NULL as well which
// should be caught by the caller.
}
// Returns the file path following the device spec.
// e.g. 'hd(1,b)mach_kernel' is reduced to 'mach_kernel'.
*outPath = cp;
return bvr;
}
