Add UDPC_create_id_easy

UDPC_create_id_easy will detect if the input addr string is link local
or not, and will create the ipv6 address based on it.

src/UDPConnection.cpp

@@ -1221,6 +1221,18 @@ UDPC_ConnectionId UDPC_create_id_anyaddr(uint16_t port) {
     return UDPC_ConnectionId{in6addr_any, 0, port};
 }
 
+UDPC_ConnectionId UDPC_create_id_easy(const char *addrString, uint16_t port) {
+    UDPC_ConnectionId conId{{0}, 0, port};
+    if(std::regex_match(addrString, ipv6_regex_nolink)) {
+        conId.addr = UDPC_strtoa(addrString);
+    } else if(std::regex_match(addrString, ipv6_regex_linkonly)) {
+        conId.addr = UDPC_strtoa_link(addrString, &conId.scope_id);
+    } else {
+        conId.addr = in6addr_loopback;
+    }
+    return conId;
+}
+
 UDPC_HContext UDPC_init(UDPC_ConnectionId listenId, int isClient) {
     UDPC::Context *ctx = new UDPC::Context(false);
     ctx->flags.set(1, isClient != 0);

src/UDPConnection.h

@@ -111,6 +111,8 @@ UDPC_ConnectionId UDPC_create_id_full(UDPC_IPV6_ADDR_TYPE addr, uint32_t scope_i
 
 UDPC_ConnectionId UDPC_create_id_anyaddr(uint16_t port);
 
+UDPC_ConnectionId UDPC_create_id_easy(const char *addrString, uint16_t port);
+
 UDPC_HContext UDPC_init(UDPC_ConnectionId listenId, int isClient);
 UDPC_HContext UDPC_init_threaded_update(UDPC_ConnectionId listenId,
                                 int isClient);

src/test/TestUDPC.cpp

@@ -199,3 +199,39 @@ TEST(UDPC, strtoa) {
     };
     EXPECT_EQ(UDPC_strtoa("10.1.2.3"), addr);
 }
+
+TEST(UDPC, create_id_easy) {
+    UDPC_ConnectionId conId;
+
+    // not link local
+    conId = UDPC_create_id_easy("::FFFF:7F00:1", 301);
+    for(unsigned int i = 0; i < 10; ++i) {
+        EXPECT_EQ(UDPC_IPV6_ADDR_SUB(conId.addr)[i], 0);
+    }
+    EXPECT_EQ(UDPC_IPV6_ADDR_SUB(conId.addr)[10], 0xFF);
+    EXPECT_EQ(UDPC_IPV6_ADDR_SUB(conId.addr)[11], 0xFF);
+    EXPECT_EQ(UDPC_IPV6_ADDR_SUB(conId.addr)[12], 0x7F);
+    EXPECT_EQ(UDPC_IPV6_ADDR_SUB(conId.addr)[13], 0);
+    EXPECT_EQ(UDPC_IPV6_ADDR_SUB(conId.addr)[14], 0);
+    EXPECT_EQ(UDPC_IPV6_ADDR_SUB(conId.addr)[15], 0x1);
+
+    EXPECT_EQ(conId.scope_id, 0);
+    EXPECT_EQ(conId.port, 301);
+
+    // link local
+    conId = UDPC_create_id_easy("fe80::1234:5678:9%3", 123);
+    EXPECT_EQ(UDPC_IPV6_ADDR_SUB(conId.addr)[0], 0xFE);
+    EXPECT_EQ(UDPC_IPV6_ADDR_SUB(conId.addr)[1], 0x80);
+    for(unsigned int i = 2; i < 10; ++i) {
+        EXPECT_EQ(UDPC_IPV6_ADDR_SUB(conId.addr)[i], 0);
+    }
+    EXPECT_EQ(UDPC_IPV6_ADDR_SUB(conId.addr)[10], 0x12);
+    EXPECT_EQ(UDPC_IPV6_ADDR_SUB(conId.addr)[11], 0x34);
+    EXPECT_EQ(UDPC_IPV6_ADDR_SUB(conId.addr)[12], 0x56);
+    EXPECT_EQ(UDPC_IPV6_ADDR_SUB(conId.addr)[13], 0x78);
+    EXPECT_EQ(UDPC_IPV6_ADDR_SUB(conId.addr)[14], 0);
+    EXPECT_EQ(UDPC_IPV6_ADDR_SUB(conId.addr)[15], 0x9);
+
+    EXPECT_EQ(conId.scope_id, 3);
+    EXPECT_EQ(conId.port, 123);
+}

src/test/UDPC_NetworkTest.c

@@ -118,10 +118,10 @@ int main(int argc, char **argv) {
     if(strcmp(listenAddr, "any") == 0) {
         listenId = UDPC_create_id_anyaddr(atoi(listenPort));
     } else {
-        listenId = UDPC_create_id(UDPC_strtoa(listenAddr), atoi(listenPort));
+        listenId = UDPC_create_id_easy(listenAddr, atoi(listenPort));
     }
     if(isClient) {
-        connectionId = UDPC_create_id(UDPC_strtoa(connectionAddr), atoi(connectionPort));
+        connectionId = UDPC_create_id_easy(connectionAddr, atoi(connectionPort));
     }
     UDPC_HContext context = UDPC_init_threaded_update(listenId, isClient);
     if(!context) {