network: Add [[fallthrough]] to cascading switch-case

Author: edalm

src/network/utils/ipv6-address.cc

@@ -108,31 +108,22 @@ extern "C"
 
         /* handle the last 11 bytes */
         c += length;
-        switch (len) /* all the case statements fall through */
+        switch (len)
         {
-        case 11:
-            c += ((ub4)k[10] << 24);
-        case 10:
-            c += ((ub4)k[9] << 16);
-        case 9:
-            c += ((ub4)k[8] << 8); /* the first byte of c is reserved for the length */
-        case 8:
-            b += ((ub4)k[7] << 24);
-        case 7:
-            b += ((ub4)k[6] << 16);
-        case 6:
-            b += ((ub4)k[5] << 8);
-        case 5:
-            b += k[4];
-        case 4:
-            a += ((ub4)k[3] << 24);
-        case 3:
-            a += ((ub4)k[2] << 16);
-        case 2:
-            a += ((ub4)k[1] << 8);
-        case 1:
-            a += k[0];
+            // clang-format off
+            case 11: c += ((ub4)k[10] << 24); [[fallthrough]];
+            case 10: c += ((ub4)k[9]  << 16); [[fallthrough]];
+            case 9:  c += ((ub4)k[8]  << 8);  [[fallthrough]]; /* the first byte of c is reserved for the length */
+            case 8:  b += ((ub4)k[7]  << 24); [[fallthrough]];
+            case 7:  b += ((ub4)k[6]  << 16); [[fallthrough]];
+            case 6:  b += ((ub4)k[5]  << 8);  [[fallthrough]];
+            case 5:  b += k[4];               [[fallthrough]];
+            case 4:  a += ((ub4)k[3]  << 24); [[fallthrough]];
+            case 3:  a += ((ub4)k[2]  << 16); [[fallthrough]];
+            case 2:  a += ((ub4)k[1]  << 8);  [[fallthrough]];
+            case 1:  a += k[0];
             /* case 0: nothing left to add */
+            // clang-format on
         }
         mixHashKey(a, b, c);