add uv_ip4_name and uv_ip6_name

include/uv.h

@@ -514,9 +514,15 @@ int64_t uv_now();
 
 
 /* Utility */
+
+/* Convert string ip addresses to binary structures */
 struct sockaddr_in uv_ip4_addr(const char* ip, int port);
 struct sockaddr_in6 uv_ip6_addr(const char* ip, int port);
 
+/* Convert binary addresses to strings */
+int uv_ip4_name(struct sockaddr_in* src, char* dst, size_t size);
+int uv_ip6_name(struct sockaddr_in6* src, char* dst, size_t size);
+
 /* Gets the executable path */
 int uv_exepath(char* buffer, size_t* size);
 

src/ares/inet_ntop.h

@@ -18,6 +18,7 @@
  */
 
 #ifdef HAVE_INET_NTOP
+#include <arpa/inet.h>
 #define ares_inet_ntop(w,x,y,z) inet_ntop(w,x,y,z)
 #else
 const char *ares_inet_ntop(int af, const void *src, char *dst, size_t size);

src/uv-common.c

@@ -29,6 +29,7 @@
 /* use inet_pton from c-ares if necessary */
 #include "ares_config.h"
 #include "ares/inet_net_pton.h"
+#include "ares/inet_ntop.h"
 
 /* list used for ares task handles */
 static uv_ares_task_t* uv_ares_handles_ = NULL;
@@ -112,6 +113,18 @@ struct sockaddr_in6 uv_ip6_addr(const char* ip, int port) {
 }
 
 
+int uv_ip4_name(struct sockaddr_in* src, char* dst, size_t size) {
+  char* d = ares_inet_ntop(AF_INET, &src->sin_addr, dst, size);
+  return d != dst;
+}
+
+
+int uv_ip6_name(struct sockaddr_in6* src, char* dst, size_t size) {
+  char* d = ares_inet_ntop(AF_INET6, &src->sin6_addr, dst, size);
+  return d != dst;
+}
+
+
 /* find matching ares handle in list */
 void uv_add_ares_handle(uv_ares_task_t* handle) {
   handle->ares_next = uv_ares_handles_;

test/test-getsockname.c

@@ -151,6 +151,15 @@ static int tcp_listener(int port) {
     fprintf(stderr, "uv_getsockname error (listening) %d\n", uv_last_error().code);
   }
   ASSERT(r == 0);
+
+  char ip[20];
+  r = uv_ip4_name((struct sockaddr_in*)&sockname, ip, 20);
+  ASSERT(r == 0);
+  ASSERT(ip[0] == '0');
+  ASSERT(ip[1] == '.');
+  ASSERT(ip[2] == '0');
+  printf("sockname = %s\n", ip);
+
   getsocknamecount++;
 
   return 0;