sd-device: introduce device_get_sysattr_u32()

src/libsystemd/sd-device/device-private.h

@@ -21,6 +21,7 @@ int device_get_property_bool(sd_device *device, const char *key);
 int device_get_property_int(sd_device *device, const char *key, int *ret);
 int device_get_sysattr_int(sd_device *device, const char *sysattr, int *ret_value);
 int device_get_sysattr_unsigned(sd_device *device, const char *sysattr, unsigned *ret_value);
+int device_get_sysattr_u32(sd_device *device, const char *sysattr, uint32_t *ret_value);
 int device_get_sysattr_bool(sd_device *device, const char *sysattr);
 int device_get_device_id(sd_device *device, const char **ret);
 int device_get_devlink_priority(sd_device *device, int *ret);

src/libsystemd/sd-device/sd-device.c

@@ -2423,6 +2423,25 @@ int device_get_sysattr_unsigned(sd_device *device, const char *sysattr, unsigned
         return v > 0;
 }
 
+int device_get_sysattr_u32(sd_device *device, const char *sysattr, uint32_t *ret_value) {
+        const char *value;
+        int r;
+
+        r = sd_device_get_sysattr_value(device, sysattr, &value);
+        if (r < 0)
+                return r;
+
+        uint32_t v;
+        r = safe_atou32(value, &v);
+        if (r < 0)
+                return log_device_debug_errno(device, r, "Failed to parse '%s' attribute: %m", sysattr);
+
+        if (ret_value)
+                *ret_value = v;
+        /* We return "true" if the value is positive. */
+        return v > 0;
+}
+
 int device_get_sysattr_bool(sd_device *device, const char *sysattr) {
         const char *value;
         int r;