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libdm-config: Implement dm_config_flatten.

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This commit is contained in:
Petr Rockai 2014-11-19 18:37:31 +01:00
parent 956c192841
commit 274a7a68b8
2 changed files with 58 additions and 0 deletions
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5
libdm/libdevmapper.h
View File

@ -1848,6 +1848,11 @@ struct dm_config_tree *dm_config_insert_cascaded_tree(struct dm_config_tree *fir
*/
struct dm_config_tree *dm_config_remove_cascaded_tree(struct dm_config_tree *cft);
/*
* Create a new, uncascaded config tree equivalent to the input cascade.
*/
struct dm_config_tree *dm_config_flatten(struct dm_config_tree *cft);
void dm_config_destroy(struct dm_config_tree *cft);
/* Simple output line by line. */

53
libdm/libdm-config.c
View File

@ -1315,3 +1315,56 @@ struct dm_pool *dm_config_memory(struct dm_config_tree *cft)
{
return cft->mem;
}
static int _override_path(const char *path, struct dm_config_node *node, void *baton)
{
struct dm_config_tree *cft = baton;
struct dm_config_node dummy, *target;
dummy.child = cft->root;
if (!(target = _find_or_make_node(cft->mem, &dummy, path)))
return_0;
if (!(target->v = _clone_config_value(cft->mem, node->v)))
return_0;
cft->root = dummy.child;
return 1;
}
static int _enumerate(const char *path, struct dm_config_node *cn, int (*cb)(const char *, struct dm_config_node *, void *), void *baton)
{
char *sub = NULL;
while (cn) {
if (dm_asprintf(&sub, "%s/%s", path, cn->key) < 0)
return_0;
if (cn->child) {
if (!_enumerate(sub, cn->child, cb, baton))
goto_bad;
} else
if (!cb(sub, cn, baton))
goto_bad;
dm_free(sub);
cn = cn->sib;
}
return 1;
bad:
dm_free(sub);
return 0;
}
struct dm_config_tree *dm_config_flatten(struct dm_config_tree *cft)
{
struct dm_config_tree *res = dm_config_create(), *done = NULL, *current = NULL;
if (!res)
return_NULL;
while (done != cft) {
current = cft;
while (current->cascade != done)
current = current->cascade;
_enumerate("", current->root, _override_path, res);
done = current;
}
return res;
}