util: json: Introduce virJSONValueArrayConcat

Add a helper that concatenates the second array into the first.
Signed-off-by: NPeter Krempa <pkrempa@redhat.com>
Reviewed-by: NJán Tomko <jtomko@redhat.com>

src/libvirt_private.syms

@@ -2285,6 +2285,7 @@ virISCSIScanTargets;
 virJSONStringReformat;
 virJSONValueArrayAppend;
 virJSONValueArrayAppendString;
+virJSONValueArrayConcat;
 virJSONValueArrayForeachSteal;
 virJSONValueArrayGet;
 virJSONValueArraySize;

src/util/virjson.c

@@ -811,6 +811,37 @@ virJSONValueArrayAppendString(virJSONValuePtr object,
 }
 
 
+/**
+ * virJSONValueArrayConcat:
+ * @a: JSON value array (destination)
+ * @c: JSON value array (source)
+ *
+ * Merges the members of @c array into @a. The values are stolen from @c.
+ */
+int
+virJSONValueArrayConcat(virJSONValuePtr a,
+                        virJSONValuePtr c)
+{
+    size_t i;
+
+    if (a->type != VIR_JSON_TYPE_ARRAY ||
+        c->type != VIR_JSON_TYPE_ARRAY) {
+        virReportError(VIR_ERR_INTERNAL_ERROR, "%s", _("expecting JSON array"));
+        return -1;
+    }
+
+    a->data.array.values = g_renew(virJSONValuePtr, a->data.array.values,
+                                   a->data.array.nvalues + c->data.array.nvalues);
+
+    for (i = 0; i < c->data.array.nvalues; i++)
+        a->data.array.values[a->data.array.nvalues++] = g_steal_pointer(&c->data.array.values[i]);
+
+    c->data.array.nvalues = 0;
+
+    return 0;
+}
+
+
 int
 virJSONValueObjectHasKey(virJSONValuePtr object,
                          const char *key)

src/util/virjson.h

@@ -71,6 +71,8 @@ virJSONValuePtr virJSONValueNewArrayFromBitmap(virBitmapPtr bitmap);
 
 int virJSONValueObjectAppend(virJSONValuePtr object, const char *key, virJSONValuePtr value);
 int virJSONValueArrayAppend(virJSONValuePtr object, virJSONValuePtr value);
+int virJSONValueArrayConcat(virJSONValuePtr a,
+                            virJSONValuePtr c);
 
 int virJSONValueObjectHasKey(virJSONValuePtr object, const char *key);
 virJSONValuePtr virJSONValueObjectGet(virJSONValuePtr object, const char *key);