tools: acrn-manager: fix warnings before updating Makefile

- Print warning if string truncated to avoid the warning generated
  by -Wformat-truncation by GCC 7.0 and newer version;
- fixed strncpy size.

Tracked-On: #1122
Signed-off-by: Yan, Like <like.yan@intel.com>
Acked-by: Eddie Dong <eddie.dong@intel.com>

tools/acrn-manager/acrn_mngr.c

@@ -479,8 +479,11 @@ static int connect_to_server(const char *name)
 	}
 
 	mfd->addr.sun_family = AF_UNIX;
-	snprintf(mfd->addr.sun_path, sizeof(mfd->addr.sun_path),
+	ret = snprintf(mfd->addr.sun_path, sizeof(mfd->addr.sun_path),
 		 "/run/acrn/mngr/%s", s_name);
+	if ((ret >= 0) && (ret < strlen(s_name)))
+		printf("WARN: %s is truncated\n", s_name);
+
 	closedir(dir);
 	ret =
 	    connect(mfd->fd, (struct sockaddr *)&mfd->addr, sizeof(mfd->addr));

tools/acrn-manager/acrnd.c

@@ -175,7 +175,7 @@ static int load_timer_list(void)
 		}
 
 		memset(arg.name, 0, sizeof(arg.name));
-		strncpy(arg.name, s1, sizeof(s1));
+		strncpy(arg.name, s1, sizeof(arg.name));
 
 		expire = strtoul(s2, NULL, 10);
 		if (expire == 0 || errno == ERANGE) {