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qapi: Introduce QAPI_LIST_APPEND 

Similar to the existing QAPI_LIST_PREPEND, but designed for use where
we want to preserve insertion order.  Callers will be added in
upcoming patches.  Note the difference in signature: PREPEND takes
List*, APPEND takes List**.

Signed-off-by: Eric Blake <eblake@redhat.com>
Reviewed-by: Vladimir Sementsov-Ogievskiy <vsementsov@virtuozzo.com>
Message-Id: <20210113221013.390592-4-eblake@redhat.com>
Reviewed-by: Markus Armbruster <armbru@redhat.com>
Signed-off-by: Markus Armbruster <armbru@redhat.com>
This commit is contained in:
Eric Blake 2021-01-13 16:10:11 -06:00 committed by Markus Armbruster
parent 240ee8bd31
commit dc13f40c6b
1 changed files with 13 additions and 0 deletions
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13
include/qapi/util.h
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@ -37,4 +37,17 @@ int parse_qapi_name(const char *name, bool complete);
(list) = _tmp; \
} while (0)
/*
* For any pointer to a GenericList @tail (usually the 'next' member of a
* list element), insert @element at the back and update the tail.
*
* Note that this macro evaluates @element exactly once, so it is safe
* to have side-effects with that argument.
*/
#define QAPI_LIST_APPEND(tail, element) do { \
*(tail) = g_malloc0(sizeof(**(tail))); \
(*(tail))->value = (element); \
(tail) = &(*(tail))->next; \
} while (0)
#endif