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conf: implement snd_config_add_before() and snd_config_add_after()

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Signed-off-by: Jaroslav Kysela <perex@perex.cz>
This commit is contained in:
Jaroslav Kysela 2019-11-14 16:56:05 +01:00
parent 4724158c0a
commit 4c021697f1
3 changed files with 100 additions and 1 deletions
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82
src/conf.c
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@ -1978,6 +1978,88 @@ int snd_config_add(snd_config_t *parent, snd_config_t *child)
return 0;
}
/**
* \brief Adds a child after another child configuration node.
* \param after Handle to the start configuration node.
* \param child Handle to the configuration node to be added.
* \return Zero if successful, otherwise a negative error code.
*
* This function makes the node \a child a child of the parent of
* the node \a after.
*
* The parent node then owns the child node, i.e., the child node gets
* deleted together with its parent.
*
* \a child must have an id.
*
* \par Errors:
* <dl>
* <dt>-EINVAL<dd>\a child does not have an id.
* <dt>-EINVAL<dd>\a child already has a parent.
* <dt>-EEXIST<dd>\a parent already contains a child node with the same
* id as \a child.
* </dl>
*/
int snd_config_add_after(snd_config_t *after, snd_config_t *child)
{
snd_config_iterator_t i, next;
snd_config_t *parent;
assert(after && child);
parent = after->parent;
assert(parent);
if (!child->id || child->parent)
return -EINVAL;
snd_config_for_each(i, next, parent) {
snd_config_t *n = snd_config_iterator_entry(i);
if (strcmp(child->id, n->id) == 0)
return -EEXIST;
}
child->parent = parent;
list_insert(&child->list, &after->list, after->list.next);
return 0;
}
/**
* \brief Adds a child before another child configuration node.
* \param before Handle to the start configuration node.
* \param child Handle to the configuration node to be added.
* \return Zero if successful, otherwise a negative error code.
*
* This function makes the node \a child a child of the parent of
* the node \a before.
*
* The parent node then owns the child node, i.e., the child node gets
* deleted together with its parent.
*
* \a child must have an id.
*
* \par Errors:
* <dl>
* <dt>-EINVAL<dd>\a child does not have an id.
* <dt>-EINVAL<dd>\a child already has a parent.
* <dt>-EEXIST<dd>\a parent already contains a child node with the same
* id as \a child.
* </dl>
*/
int snd_config_add_before(snd_config_t *before, snd_config_t *child)
{
snd_config_iterator_t i, next;
snd_config_t *parent;
assert(before && child);
parent = before->parent;
assert(parent);
if (!child->id || child->parent)
return -EINVAL;
snd_config_for_each(i, next, parent) {
snd_config_t *n = snd_config_iterator_entry(i);
if (strcmp(child->id, n->id) == 0)
return -EEXIST;
}
child->parent = parent;
list_insert(&child->list, before->list.prev, &before->list);
return 0;
}
/**
* \brief Removes a configuration node from its tree.
* \param config Handle to the configuration node to be removed.