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qdict: Add qdict_array_split()

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This function splits a QDict consisting of entries prefixed by
incrementally enumerated indices into a QList of QDicts.

Signed-off-by: Max Reitz <mreitz@redhat.com>
Reviewed-by: Kevin Wolf <kwolf@redhat.com>
Reviewed-by: Eric Blake <eblake@redhat.com>
Signed-off-by: Kevin Wolf <kwolf@redhat.com>
This commit is contained in:
Max Reitz 2013-12-20 19:28:03 +01:00 committed by Kevin Wolf
parent d4881b9bcb
commit 05a8c22271
2 changed files with 38 additions and 0 deletions
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1
include/qapi/qmp/qdict.h
View File

@ -68,5 +68,6 @@ QDict *qdict_clone_shallow(const QDict *src);
void qdict_flatten(QDict *qdict);
void qdict_extract_subqdict(QDict *src, QDict **dst, const char *start);
void qdict_array_split(QDict *src, QList **dst);
#endif /* QDICT_H */

37
qobject/qdict.c
View File

@ -554,3 +554,40 @@ void qdict_extract_subqdict(QDict *src, QDict **dst, const char *start)
entry = next;
}
}
/**
* qdict_array_split(): This function moves array-like elements of a QDict into
* a new QList of QDicts. Every entry in the original QDict with a key prefixed
* "%u.", where %u designates an unsigned integer starting at 0 and
* incrementally counting up, will be moved to a new QDict at index %u in the
* output QList with the key prefix removed. The function terminates when there
* is no entry in the QDict with a prefix directly (incrementally) following the
* last one.
* Example: {"0.a": 42, "0.b": 23, "1.x": 0, "3.y": 1, "o.o": 7}
* (or {"1.x": 0, "3.y": 1, "0.a": 42, "o.o": 7, "0.b": 23})
* => [{"a": 42, "b": 23}, {"x": 0}]
* and {"3.y": 1, "o.o": 7} (remainder of the old QDict)
*/
void qdict_array_split(QDict *src, QList **dst)
{
unsigned i;
*dst = qlist_new();
for (i = 0; i < UINT_MAX; i++) {
QDict *subqdict;
char prefix[32];
size_t snprintf_ret;
snprintf_ret = snprintf(prefix, 32, "%u.", i);
assert(snprintf_ret < 32);
qdict_extract_subqdict(src, &subqdict, prefix);
if (!qdict_size(subqdict)) {
QDECREF(subqdict);
break;
}
qlist_append_obj(*dst, QOBJECT(subqdict));
}
}