Problem

Currently we store both the escaped and unescaped name in a Key and in a way that there cannot be an optimization not to store it (there are functions handling out the pointer).

Constraints

allow implementations of Elektra to not store two names

Assumptions

the memory consumption of storing the name twice is considerable

Considered Alternatives

store it twice
store it once but in one memory block

Decision

Remove the escaped name from struct _Key and use it only when necessary.

Clarify and reduce terminology.

API Changes:

keyName returns the unescaped name (temporary some other name for PR: keyUnescapedName(Size))
remove keyUnescapedName, keyGetUnescapedNameSize.
reverse terminology: with "key name" we will refer to the unescaped (base) name, the escaped name will be explicitly called "escaped key name".
escaped name will be only present in
- keyNew (+ arguments for adding key names) [unclear: maybe not needed]
- elektraEscapeName (operating on chars)
- rename keyAddName, e.g. to keyAddEscapedName
keyDup(.., int) with options to filter which parts are copied (to allow copy of keys where only the key name is copied)

Rationale

Implications

needs fix of OPMPHM
Later modifications in keyNew to also accept key base names might be useful:
keyNew(KEY_VALUE, "...", KEY_NAME, "", "...", KEY_END)
keyNew (KEY_NAME, KEY_NS_USER, "abc", "def", KEY_NAME_END, KEY_END);