elektra/proposal.c File Reference

Implementation of proposed API enhancements. More...

#include <string.h>
#include <kdbprivate.h>

Include dependency graph for elektra/proposal.c:

Functions
Key *	elektraKsPrev (KeySet *ks)
	Returns the previous Key in a KeySet. More...
KeySet *	elektraRenameKeys (KeySet *config, const char *name)
	Takes the first key and cuts off this common part for all other keys, instead name will be prepended. More...
int	elektraKeyLock (Key *key, enum elektraLockOptions what)
	Permanently locks a part of the key. More...
Key *	elektraKsPopAtCursor (KeySet *ks, cursor_t pos)
	Pop key at given cursor position. More...

Detailed Description

Implementation of proposed API enhancements.

Copyright

BSD License (see doc/COPYING or http://www.libelektra.org)

Function Documentation

int elektraKeyLock	(	Key *	key,
		enum elektraLockOptions	what
	)

Permanently locks a part of the key.

This can be:

• KEY_FLAG_LOCK_NAME to lock the name
• KEY_FLAG_LOCK_VALUE to lock the value
• KEY_FLAG_LOCK_META to lock the meta data

To unlock the key, duplicate it.

It is also possible to lock when the key is created with keyNew().

Some data structures need to lock the key (most likely its name), so that the ordering does not get confused.

Parameters

key	which name should be locked

See also

keyNew(), keyDup(), ksAppendKey()

Return values

>0	the bits that were successfully locked
0	if everything was locked before
-1	if it could not be locked (nullpointer)

Key* elektraKsPopAtCursor	(	KeySet *	ks,
		cursor_t	pos
	)

Pop key at given cursor position.

Parameters

ks	the keyset to pop key from
c	where to pop

The internal cursor will be rewinded using ksRewind(). You can use ksGetCursor() and ksSetCursor() jump back to the previous position. e.g. to pop at current position within ksNext() loop:

cursor_t c = ksGetCursor(ks);
keyDel (ksPopAtCursor(ks, c));
ksSetCursor(ks, c);
ksPrev(ks); // to have correct key after next ksNext()

Warning

do not use, will be superseded by external iterator API

Returns

the popped key

Return values

0	if ks is 0

Key* elektraKsPrev

(

KeySet *

ks

)

Returns the previous Key in a KeySet.

KeySets have an internal cursor that can be reset with ksRewind(). Every time ksPrev() is called the cursor is decremented and the new current Key is returned.

You'll get a NULL pointer if the key before begin of the KeySet was reached.

Don't delete the key, use ksPop() if you want to delete it.

Returns

the new current Key

See also

ksRewind(), ksCurrent()

KeySet* elektraRenameKeys	(	KeySet *	config,
		const char *	name
	)

Takes the first key and cuts off this common part for all other keys, instead name will be prepended.

Returns

a new allocated keyset with keys in user namespace.

The first key is removed in the resulting keyset.