static const char *
full_name_of_hw (struct hw *leaf,
char *buf,
unsigned sizeof_buf)
{
/* get a buffer */
char full_name[1024];
if (buf == (char*)0)
{
buf = full_name;
sizeof_buf = sizeof (full_name);
}
/* use head recursion to construct the path */
if (hw_parent (leaf) == NULL)
/* root */
{
if (sizeof_buf < 1)
hw_abort (leaf, "buffer overflow");
*buf = '\0';
}
else
/* sub node */
{
char unit[1024];
full_name_of_hw (hw_parent (leaf), buf, sizeof_buf);
if (hw_unit_encode (hw_parent (leaf),
hw_unit_address (leaf),
unit + 1,
sizeof (unit) - 1)
> 0)
unit[0] = '@';
else
unit[0] = '\0';
if (strlen (buf) + strlen ("/") + strlen (hw_name (leaf)) + strlen (unit)
>= sizeof_buf)
hw_abort (leaf, "buffer overflow");
strcat (buf, "/");
strcat (buf, hw_name (leaf));
strcat (buf, unit);
}
/* return it usefully */
if (buf == full_name)
buf = hw_strdup (leaf, full_name);
return buf;
}
unsigned int dv_get_bus_num (struct hw *me)
{
const hw_unit *unit = hw_unit_address (me);
return unit->cells[unit->nr_cells - 1];
}
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;
}