[ip6] rename methods fully initializing an Ip6::Address/Prefix (openthread#13169)

This commit renames several methods in `Ip6::Address`,
`Ip6::InterfaceIdentifier`, `Ip6::Prefix`, and `Ip4::Address` that
fully initialize the object from `Set...()` to `Init...()`.

This creates a clear semantic distinction in the API:
- `Init...()`: Fully (re-)initializing the object.
- `Set...()`: Modifies a specific property or a sub-component of
   the object (e.g., `SetPrefix()`,  `SetLocator()`,
   `SetSubnetId()`).

Some examples of renames include:
- `SetFromExtAddress()` -> `InitFromExtAddress()`
- `SetToLocator()` -> `InitAsLocator()`
- `SetToLinkLocalAddress()` -> `InitAsLinkLocalAddress()`
- `SetToRoutingLocator()` -> `InitAsRoutingLocator()`
- `SetToAnycastLocator()` -> `InitAsAnycastLocator()`
- `SetToIp4Mapped()` -> `InitAsIp4Mapped()`

All calls to these methods across the codebase have been updated
to reflect the new names.

Author: abtink

src/core/api/ip6_api.cpp

@@ -191,7 +191,7 @@ bool otIp6IsLinkLocalUnicast(const otIp6Address *aAddress) { return AsCoreType(a
 
 void otIp6FormLinkLocalAddressFromExtAddress(const otExtAddress *aExtAddress, otIp6Address *aAddress)
 {
-    AsCoreType(aAddress).SetToLinkLocalAddress(AsCoreType(aExtAddress));
+    AsCoreType(aAddress).InitAsLinkLocalAddress(AsCoreType(aExtAddress));
 }
 
 void otIp6ExtractExtAddressFromIp6AddressIid(const otIp6Address *aAddress, otExtAddress *aExtAddress)

src/core/api/nat64_api.cpp

@@ -142,7 +142,7 @@ otError otIp4FromIp4MappedIp6Address(const otIp6Address *aIp6Address, otIp4Addre
 
 void otIp4ToIp4MappedIp6Address(const otIp4Address *aIp4Address, otIp6Address *aIp6Address)
 {
-    AsCoreType(aIp6Address).SetToIp4Mapped(AsCoreType(aIp4Address));
+    AsCoreType(aIp6Address).InitAsIp4Mapped(AsCoreType(aIp4Address));
 }
 
 otError otIp4AddressFromString(const char *aString, otIp4Address *aAddress)

src/core/backbone_router/bbr_local.cpp

@@ -57,7 +57,7 @@ Local::Local(Instance &aInstance)
 
     // Primary Backbone Router Aloc
     mBbrPrimaryAloc.InitAsThreadOriginMeshLocal();
-    mBbrPrimaryAloc.GetAddress().GetIid().SetToLocator(Mle::Aloc16::ForPrimaryBackboneRouter());
+    mBbrPrimaryAloc.GetAddress().GetIid().InitAsLocator(Mle::Aloc16::ForPrimaryBackboneRouter());
 
     // All Network Backbone Routers Multicast Address.
     mAllNetworkBackboneRouters.Clear();

src/core/border_router/infra_if.cpp

@@ -278,7 +278,7 @@ Error InfraIf::LinkLayerAddress::ConvertToIid(Ip6::InterfaceIdentifier &aIid) co
         ExitNow(error = kErrorNotCapable);
     }
 
-    aIid.SetFromExtAddress(extAddress);
+    aIid.InitFromExtAddress(extAddress);
 
 exit:
     return error;

src/core/border_router/routing_manager.cpp

@@ -224,7 +224,7 @@ void RoutingManager::LoadOrGenerateRandomBrUlaPrefix(void)
 
         SuccessOrAssert(randomUlaPrefix.GenerateRandomUla());
 
-        mBrUlaPrefix.Set(randomUlaPrefix);
+        mBrUlaPrefix.InitFrom(randomUlaPrefix);
         mBrUlaPrefix.SetSubnetId(0);
         mBrUlaPrefix.SetLength(kBrUlaPrefixLength);
 

src/core/meshcop/border_agent_txt_data.cpp

@@ -544,7 +544,7 @@ bool TxtData::Info::ReadOmrPrefix(const Dns::TxtEntry &aEntry, Ip6::Prefix &aPre
     VerifyOrExit(length <= Ip6::Prefix::kMaxLength);
     VerifyOrExit(aEntry.mValueLength >= sizeof(uint8_t) + Ip6::Prefix::SizeForLength(length));
 
-    aPrefix.Set(&aEntry.mValue[1], length);
+    aPrefix.InitFrom(&aEntry.mValue[1], length);
     didRead = true;
 
 exit:

src/core/meshcop/joiner_router.cpp

@@ -168,7 +168,7 @@ template <> void JoinerRouter::HandleTmf<kUriRelayTx>(Coap::Msg &aMsg)
 
     SuccessOrExit(error = message->AppendBytesFromMessage(aMsg.mMessage, offsetRange));
 
-    messageInfo.GetPeerAddr().SetToLinkLocalAddress(joinerIid);
+    messageInfo.GetPeerAddr().InitAsLinkLocalAddress(joinerIid);
     messageInfo.SetPeerPort(joinerPort);
 
     SuccessOrExit(error = mSocket.SendTo(*message, messageInfo));

src/core/meshcop/seeker.cpp

@@ -279,7 +279,7 @@ Error Seeker::SetUpNextConnection(Ip6::SockAddr &aSockAddr)
 
     aSockAddr.Clear();
     aSockAddr.SetPort(entry.mJoinerUdpPort);
-    aSockAddr.GetAddress().SetToLinkLocalAddress(entry.mExtAddr);
+    aSockAddr.GetAddress().InitAsLinkLocalAddress(entry.mExtAddr);
 
 exit:
     return error;

src/core/net/dhcp6_client.cpp

@@ -268,7 +268,7 @@ void Client::Solicit(uint16_t aRloc16)
 #if OPENTHREAD_ENABLE_DHCP6_MULTICAST_SOLICIT
     messageInfo.SetPeerAddr(Ip6::Address::GetRealmLocalAllRoutersMulticast());
 #else
-    messageInfo.GetPeerAddr().SetToRoutingLocator(Get<Mle::Mle>().GetMeshLocalPrefix(), aRloc16);
+    messageInfo.GetPeerAddr().InitAsRoutingLocator(Get<Mle::Mle>().GetMeshLocalPrefix(), aRloc16);
 #endif
     messageInfo.SetSockAddr(Get<Mle::Mle>().GetMeshLocalRloc());
     messageInfo.mPeerPort = kDhcpServerPort;

src/core/net/dhcp6_server.cpp

@@ -402,7 +402,7 @@ Error Server::AppendIaAddressOption(Message               &aMessage,
 
     option.Init();
     option.GetAddress().SetPrefix(aPrefix.mFields.m8, OT_IP6_PREFIX_BITSIZE);
-    option.GetAddress().GetIid().SetFromExtAddress(aClientAddress);
+    option.GetAddress().GetIid().InitFromExtAddress(aClientAddress);
     option.SetPreferredLifetime(IaAddressOption::kDefaultPreferredLifetime);
     option.SetValidLifetime(IaAddressOption::kDefaultValidLifetime);
     SuccessOrExit(error = aMessage.Append(option));