static struct hw *
split_fill_path (struct hw *current,
const char *device_specifier,
name_specifier *spec)
{
/* break it up */
if (!split_device_specifier (current, device_specifier, spec))
hw_abort (current, "error parsing %s\n", device_specifier);
/* fill our tree with its contents */
current = split_find_device (current, spec);
/* add any additional devices as needed */
if (spec->name != NULL)
{
do
{
if (current != NULL && !hw_finished_p (current))
hw_finish (current);
current = hw_create (NULL,
current,
spec->family,
spec->name,
spec->unit,
spec->args);
}
while (split_device_name (spec));
}
return current;
}
split_fill_path(device *current,
const char *device_specifier,
name_specifier *spec)
{
/* break it up */
if (!split_device_specifier(current, device_specifier, spec))
device_error(current, "error parsing %s\n", device_specifier);
/* fill our tree with its contents */
current = split_find_device(current, spec);
/* add any additional devices as needed */
if (spec->name != NULL) {
do {
current = device_create(current, spec->base, spec->name,
spec->unit, spec->args);
} while (split_device_name(spec));
}
return current;
}
static struct hw *
split_find_device (struct hw *current,
name_specifier *spec)
{
/* strip off (and process) any leading ., .., ./ and / */
while (1)
{
if (strncmp (spec->path, "/", strlen ("/")) == 0)
{
/* cd /... */
while (current != NULL && hw_parent (current) != NULL)
current = hw_parent (current);
spec->path += strlen ("/");
}
else if (strncmp (spec->path, "./", strlen ("./")) == 0)
{
/* cd ./... */
current = current;
spec->path += strlen ("./");
}
else if (strncmp (spec->path, "../", strlen ("../")) == 0)
{
/* cd ../... */
if (current != NULL && hw_parent (current) != NULL)
current = hw_parent (current);
spec->path += strlen ("../");
}
else if (strcmp (spec->path, ".") == 0)
{
/* cd . */
current = current;
spec->path += strlen (".");
}
else if (strcmp (spec->path, "..") == 0)
{
/* cd .. */
if (current != NULL && hw_parent (current) != NULL)
current = hw_parent (current);
spec->path += strlen ("..");
}
else
break;
}
/* now go through the path proper */
if (current == NULL)
{
split_device_name (spec);
return NULL;
}
while (split_device_name (spec))
{
struct hw *child;
for (child = hw_child (current);
child != NULL; child = hw_sibling (child))
{
if (strcmp (spec->name, hw_name (child)) == 0)
{
if (spec->unit == NULL)
break;
else
{
hw_unit phys;
hw_unit_decode (current, spec->unit, &phys);
if (memcmp (&phys, hw_unit_address (child),
sizeof (hw_unit)) == 0)
break;
}
}
}
if (child == NULL)
return current; /* search failed */
current = child;
}
return current;
}