bridge: add oneline option

Split output of 'bridge link' across multiple lines,
only show the flags if -d is set, and add --oneline option
like ip command.

bridge/bridge.c

@@ -17,9 +17,11 @@
 struct rtnl_handle rth = { .fd = -1 };
 int preferred_family = AF_UNSPEC;
 int resolve_hosts;
+int oneline = 0;
 int show_stats;
 int show_details;
 int timestamp;
+char * _SL_ = NULL;
 
 static void usage(void) __attribute__((noreturn));
 
@@ -28,7 +30,8 @@ static void usage(void)
 	fprintf(stderr,
 "Usage: bridge [ OPTIONS ] OBJECT { COMMAND | help }\n"
 "where  OBJECT := { link | fdb | mdb | vlan | monitor }\n"
-"       OPTIONS := { -V[ersion] | -s[tatistics] | -d[etails]\n" );
+"       OPTIONS := { -V[ersion] | -s[tatistics] | -d[etails] |\n"
+"                    -o[neline] | -t[imestamp] \n");
 	exit(-1);
 }
 
@@ -88,6 +91,8 @@ main(int argc, char **argv)
 			++show_stats;
 		} else if (matches(opt, "-details") == 0) {
 			++show_details;
+		} else if (matches(opt, "-oneline") == 0) {
+			++oneline;
 		} else if (matches(opt, "-timestamp") == 0) {
 			++timestamp;
                 } else if (matches(opt, "-family") == 0) {
@@ -114,6 +119,8 @@ main(int argc, char **argv)
 		argc--;	argv++;
 	}
 
+	_SL_ = oneline ? "\\" : "\n" ;
+
 	if (rtnl_open(&rth, 0) < 0)
 		exit(1);
 

bridge/link.c

@@ -169,6 +169,10 @@ int print_linkinfo(const struct sockaddr_nl *who,
 			if (prtb[IFLA_BRPORT_COST])
 				fprintf(fp, "cost %u ",
 					rta_getattr_u32(prtb[IFLA_BRPORT_COST]));
+
+			if (show_details) {
+				fprintf(fp, "%s    ", _SL_);
+
 				if (prtb[IFLA_BRPORT_MODE])
 					print_onoff(fp, "hairpin",
 						    rta_getattr_u8(prtb[IFLA_BRPORT_MODE]));
@@ -181,6 +185,7 @@ int print_linkinfo(const struct sockaddr_nl *who,
 				if (prtb[IFLA_BRPORT_FAST_LEAVE])
 					print_onoff(fp, "fastleave",
 						    rta_getattr_u8(prtb[IFLA_BRPORT_FAST_LEAVE]));
+			}
 		} else
 			print_portstate(fp, rta_getattr_u8(tb[IFLA_PROTINFO]));
 	}