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util: json: add helper to iterate JSON object key=value pairs
This helper eases iterating all key=value pairs stored in a JSON object. Usually we pick only certain known keys from a JSON object, but this will allow to walk complete objects and have the callback act on those.
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@ -1550,6 +1550,7 @@ virJSONValueObjectAppendNumberUlong;
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virJSONValueObjectAppendString;
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virJSONValueObjectCreate;
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virJSONValueObjectCreateVArgs;
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virJSONValueObjectForeachKeyValue;
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virJSONValueObjectGet;
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virJSONValueObjectGetBoolean;
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virJSONValueObjectGetKey;
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@ -1200,6 +1200,39 @@ virJSONValueObjectIsNull(virJSONValuePtr object,
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}
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/**
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* virJSONValueObjectForeachKeyValue:
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* @object: JSON object to iterate
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* @cb: callback to call on key-value pairs contained in the object
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* @opaque: generic data for the callback
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*
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* Iterates all key=value pairs in @object. Iteration breaks if @cb returns
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* negative value.
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*
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* Returns 0 if all elements were iterated, -2 if @cb returned negative value
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* during iteration and -1 on generic errors.
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*/
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int
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virJSONValueObjectForeachKeyValue(virJSONValuePtr object,
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virJSONValueObjectIteratorFunc cb,
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void *opaque)
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{
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size_t i;
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if (object->type != VIR_JSON_TYPE_OBJECT)
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return -1;
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for (i = 0; i < object->data.object.npairs; i++) {
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virJSONObjectPairPtr elem = object->data.object.pairs + i;
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if (cb(elem->key, elem->value, opaque) < 0)
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return -2;
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}
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return 0;
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}
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#if WITH_YAJL
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static int
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virJSONParserInsertValue(virJSONParserPtr parser,
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@ -157,4 +157,12 @@ virJSONValuePtr virJSONValueFromString(const char *jsonstring);
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char *virJSONValueToString(virJSONValuePtr object,
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bool pretty);
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typedef int (*virJSONValueObjectIteratorFunc)(const char *key,
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const virJSONValue *value,
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void *opaque);
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int virJSONValueObjectForeachKeyValue(virJSONValuePtr object,
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virJSONValueObjectIteratorFunc cb,
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void *opaque);
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#endif /* __VIR_JSON_H_ */
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