Changeset 0255d36 in mainline

Timestamp:

2011-11-28T17:07:51Z (13 years ago)

Author:

Jan Vesely <jano.vesely@…>

Branches:

lfn, master, serial, ticket/834-toolchain-update, topic/msim-upgrade, topic/simplify-dev-export

Children:

69b9740

Parents:

d085fbbe

Message:

libusbdev: Minor refactoring of alternate interfaces.

File:

• uspace/lib/usbdev/src/altiface.c (modified) (6 diffs)

uspace/lib/usbdev/src/altiface.c

@@ -65 +65 @@
         size_t alternate_count = 0;
 
-        const uint8_t *iface_ptr = usb_dp_get_nested_descriptor(&dp_parser,
-            &dp_data, config_descr);
+        const void *iface_ptr =
+            usb_dp_get_nested_descriptor(&dp_parser, &dp_data, config_descr);
         while (iface_ptr != NULL) {
-                usb_standard_interface_descriptor_t *iface
-                    = (usb_standard_interface_descriptor_t *) iface_ptr;
-                if (iface->descriptor_type == USB_DESCTYPE_INTERFACE) {
-                        if (iface->interface_number == interface_no) {
-                                alternate_count++;
-                        }
+                const usb_standard_interface_descriptor_t *iface = iface_ptr;
+                if (iface->descriptor_type == USB_DESCTYPE_INTERFACE
+                    && iface->interface_number == interface_no) {
+                        ++alternate_count;
                 }
                 iface_ptr = usb_dp_get_sibling_descriptor(&dp_parser, &dp_data,
@@ -82 +80 @@
 }
 
-/** Create alternate interface representation structure.
+/** Initialize alternate interface representation structure.
  *
+ * @param[in] alternates Pointer to allocated structure.
  * @param[in] config_descr Configuration descriptor.
  * @param[in] config_descr_size Size of configuration descriptor.
  * @param[in] interface_number Interface number.
- * @param[out] alternates_ptr Where to store pointer to allocated structure.
  * @return Error code.
  */
@@ -101 +99 @@
         alternates->current = 0;
 
+        /* No interfaces. */
         if (interface_number < 0) {
                 return EOK;
@@ -107 +106 @@
         alternates->alternative_count
             = usb_interface_count_alternates(config_descr, config_descr_size,
-            interface_number);
+                interface_number);
 
         if (alternates->alternative_count == 0) {
@@ -131 +130 @@
             = &alternates->alternatives[0];
 
-        const uint8_t *iface_ptr = usb_dp_get_nested_descriptor(&dp_parser,
-            &dp_data, dp_data.data);
+        const void *iface_ptr =
+            usb_dp_get_nested_descriptor(&dp_parser, &dp_data, dp_data.data);
+
         while (iface_ptr != NULL) {
-                usb_standard_interface_descriptor_t *iface
-                    = (usb_standard_interface_descriptor_t *) iface_ptr;
+                const usb_standard_interface_descriptor_t *iface = iface_ptr;
+
                 if ((iface->descriptor_type != USB_DESCTYPE_INTERFACE)
                     || (iface->interface_number != interface_number)) {
+                        /* This is not a valid alternate interface descriptor
+                         * for interface with number == interface_number. */
                         iface_ptr = usb_dp_get_sibling_descriptor(&dp_parser,
                             &dp_data, dp_data.data, iface_ptr);
@@ -149 +151 @@
                 iface_ptr = usb_dp_get_sibling_descriptor(&dp_parser, &dp_data,
                     dp_data.data, iface_ptr);
-                if (iface_ptr == NULL) {
-                        const uint8_t *next = dp_data.data + dp_data.size;
-                        cur_alt_iface->nested_descriptors_size
-                            = next - cur_alt_iface->nested_descriptors;
-                } else {
-                        cur_alt_iface->nested_descriptors_size
-                            = iface_ptr - cur_alt_iface->nested_descriptors;
-                }
 
-                cur_alt_iface++;
+                const uint8_t *next = (iface_ptr == NULL) ?
+                    dp_data.data + dp_data.size : iface_ptr;
+
+                cur_alt_iface->nested_descriptors_size
+                    = next - cur_alt_iface->nested_descriptors;
+
+                ++cur_alt_iface;
         }