+int udev_builtin_hwdb_lookup(struct udev_device *dev,
+ const char *prefix, const char *modalias,
+ const char *filter, bool test) {
+ struct udev_list_entry *list;
+ struct udev_list_entry *entry;
+ int n = 0;
+
+ if (!hwdb)
+ return -ENOENT;
+
+ if (prefix) {
+ _cleanup_free_ const char *lookup;
+
+ lookup = strjoin(prefix, modalias, NULL);
+ if (!lookup)
+ return -ENOMEM;
+ list = udev_hwdb_get_properties_list_entry(hwdb, lookup, 0);
+ } else
+ list = udev_hwdb_get_properties_list_entry(hwdb, modalias, 0);
+
+ udev_list_entry_foreach(entry, list) {
+ if (filter && fnmatch(filter, udev_list_entry_get_name(entry), FNM_NOESCAPE) != 0)
+ continue;
+
+ if (udev_builtin_add_property(dev, test,
+ udev_list_entry_get_name(entry),
+ udev_list_entry_get_value(entry)) < 0)
+ return -ENOMEM;
+ n++;
+ }
+ return n;
+}
+
+static const char *modalias_usb(struct udev_device *dev, char *s, size_t size) {
+ const char *v, *p;
+ int vn, pn;
+
+ v = udev_device_get_sysattr_value(dev, "idVendor");
+ if (!v)
+ return NULL;
+ p = udev_device_get_sysattr_value(dev, "idProduct");
+ if (!p)
+ return NULL;
+ vn = strtol(v, NULL, 16);
+ if (vn <= 0)
+ return NULL;
+ pn = strtol(p, NULL, 16);
+ if (pn <= 0)
+ return NULL;
+ snprintf(s, size, "usb:v%04Xp%04X*", vn, pn);
+ return s;
+}
+
+static int udev_builtin_hwdb_search(struct udev_device *dev, struct udev_device *srcdev,
+ const char *subsystem, const char *prefix,
+ const char *filter, bool test) {
+ struct udev_device *d;
+ char s[16];
+ int n = 0;
+
+ for (d = srcdev; d; d = udev_device_get_parent(d)) {
+ const char *dsubsys;
+ const char *modalias = NULL;
+
+ dsubsys = udev_device_get_subsystem(d);
+ if (!dsubsys)
+ continue;
+
+ /* look only at devices of a specific subsystem */
+ if (subsystem && !streq(dsubsys, subsystem))
+ continue;
+
+ modalias = udev_device_get_property_value(d, "MODALIAS");
+
+ /* the usb_device does not have a modalias, compose one */
+ if (!modalias && streq(dsubsys, "usb"))
+ modalias = modalias_usb(d, s, sizeof(s));
+
+ if (!modalias)
+ continue;
+
+ n = udev_builtin_hwdb_lookup(dev, prefix, modalias, filter, test);
+ if (n > 0)
+ break;
+ }
+
+ return n;
+}
+