[Tarantool-patches] [PATCH 13/16] sio: rework sio_strfaddr()

[Vladislav Shpilevoy via Tarantool-patches <tarantool-patches@dev.tarantool.org>]

The function was overcomplicated, and made it harder to update it
in the next patches with functional changes.

The main source of the complication was usage of both inet_ntoa()
and getnameinfo(). The latter is more universal, it can cover the
case of the former.

The patch makes it use only getnameinfo() for IP addresses
regardless of v4 or v6.

Needed for #5632
---
 src/lib/core/sio.c | 42 ++++++++++++++++--------------------------
 1 file changed, 16 insertions(+), 26 deletions(-)

diff --git a/src/lib/core/sio.c b/src/lib/core/sio.c
index d008526d5..deffee86c 100644
--- a/src/lib/core/sio.c
+++ b/src/lib/core/sio.c
@@ -329,33 +329,23 @@ sio_getsockname(int fd, struct sockaddr *addr, socklen_t *addrlen)
 const char *
 sio_strfaddr(const struct sockaddr *addr, socklen_t addrlen)
 {
-	switch (addr->sa_family) {
-		case AF_UNIX: {
-			struct sockaddr_un *u = (struct sockaddr_un *) addr;
-			if (addrlen >= sizeof(*u))
-				return tt_sprintf("unix/:%s", u->sun_path);
-			else
-				return tt_sprintf("unix/:(socket)");
-			break;
-		}
-		case AF_INET: {
-			struct sockaddr_in *in = (struct sockaddr_in *) addr;
-			return tt_snprintf(SERVICE_NAME_MAXLEN, "%s:%d",
-					   inet_ntoa(in->sin_addr),
-					   ntohs(in->sin_port));
-		}
-		default: {
-			char host[NI_MAXHOST], serv[NI_MAXSERV];
-			if (getnameinfo(addr, addrlen, host, sizeof(host),
-					serv, sizeof(serv),
-					NI_NUMERICHOST | NI_NUMERICSERV) != 0)
-				return tt_sprintf("(host):(port)");
-
-			return tt_snprintf(NI_MAXHOST + NI_MAXSERV, "[%s]:%s",
-					   host, serv);
-		}
+	if (addr->sa_family == AF_UNIX) {
+		struct sockaddr_un *u = (struct sockaddr_un *)addr;
+		if (addrlen >= sizeof(*u))
+			return tt_sprintf("unix/:%s", u->sun_path);
+		else
+			return tt_sprintf("unix/:(socket)");
+	} else {
+		char host[NI_MAXHOST], serv[NI_MAXSERV];
+		int flags = NI_NUMERICHOST | NI_NUMERICSERV;
+		if (getnameinfo(addr, addrlen, host, sizeof(host), serv,
+				sizeof(serv), flags) != 0)
+			return tt_sprintf("(host):(port)");
+		else if (addr->sa_family == AF_INET)
+			return tt_sprintf("%s:%s", host, serv);
+		else
+			return tt_sprintf("[%s]:%s", host, serv);
 	}
-	unreachable();
 }
 
 int
-- 
2.24.3 (Apple Git-128)