Adds %R printf directive for Router ID.

lib/printf.c

@@ -120,7 +120,8 @@ static char * number(char * str, long num, int base, int size, int precision,
  * available space to avoid buffer overflows and it allows some more
  * format specifiers: |%I| for formatting of IP addresses (any non-zero
  * width is automatically replaced by standard IP address width which
- * depends on whether we use IPv4 or IPv6; |%#I| gives hexadecimal format)
+ * depends on whether we use IPv4 or IPv6; |%#I| gives hexadecimal format),
+ * |%R| for Router / Network ID (u32 value printed as IPv4 address)
  * and |%m| resp. |%M| for error messages (uses strerror() to translate @errno code to
  * message text). On the other hand, it doesn't support floating
  * point numbers.
@@ -133,6 +134,7 @@ int bvsnprintf(char *buf, int size, const char *fmt, va_list args)
 	int len;
 	unsigned long num;
 	int i, base;
+	u32 x;
 	char *str, *start;
 	const char *s;
 	char ipbuf[STD_ADDRESS_P_LENGTH+1];
@@ -277,6 +279,17 @@ int bvsnprintf(char *buf, int size, const char *fmt, va_list args)
 			s = ipbuf;
 			goto str;
 
+		/* Router/Network ID - essentially IPv4 address in u32 value */
+		case 'R':
+			x = va_arg(args, u32);
+			bsprintf(ipbuf, "%d.%d.%d.%d",
+				 ((x >> 24) & 0xff),
+				 ((x >> 16) & 0xff),
+				 ((x >> 8) & 0xff),
+				 (x & 0xff));
+			s = ipbuf;
+			goto str;
+
 		/* integer number formats - set up the flags and "break" */
 		case 'o':
 			base = 8;

nest/a-set.c

@@ -34,9 +34,7 @@ int_set_format(struct adata *set, int way, byte *buf, unsigned int size)
       if (way)
 	buf += bsprintf(buf, "(%d,%d)", *z >> 16, *z & 0xffff);
       else
-	buf += bsprintf(buf, "%d.%d.%d.%d",
-			(*z >> 24) & 0xff, (*z >> 16) & 0xff,
-			(*z >> 8) & 0xff, *z & 0xff);
+	buf += bsprintf(buf, "%R", *z);
 
       z++;
       sp = 0;

nest/cmds.c

@@ -19,6 +19,7 @@ cmd_show_status(void)
 
   cli_msg(-1000, "BIRD " BIRD_VERSION);
   tm_format_datetime(tim, now);
+  cli_msg(-1011, "Router ID is %R", config->router_id);
   cli_msg(-1011, "Current server time is %s", tim);
   tm_format_datetime(tim, boot_time);
   cli_msg(-1011, "Last reboot on %s", tim);

nest/rt-attr.c

@@ -419,11 +419,7 @@ ea_format(eattr *e, byte *buf)
 	  bsprintf(buf, "%I", *(ip_addr *) ad->data);
 	  break;
 	case EAF_TYPE_ROUTER_ID:
-	  bsprintf(buf, "%d.%d.%d.%d",
-		   (e->u.data >> 24) & 0xff,
-		   (e->u.data >> 16) & 0xff,
-		   (e->u.data >> 8) & 0xff,
-		   e->u.data & 0xff);
+	  bsprintf(buf, "%R", e->u.data);
 	  break;
 	case EAF_TYPE_AS_PATH:
 	  as_path_format(ad, buf, end - buf);