[PATCH iproute2 net-next 1/4] ss: Replace printf() calls for "main" output by calls to helper

[Stefano Brivio <sbrivio@redhat.com>]

This is preparation work for output buffering, which will allow
us to use optimal spacing and alignment of logical "columns".

The new out() function is just a re-implementation of a typical
libc's printf(), except that the return value of vfprintf() is
ignored as no callers use it. This implementation will be
replaced in the next patches to provide column width adjustment
and adequate spacing.

All printf() calls that output parts of the socket list are now
replaced by calls to out(). Output of summary and version is
excluded from this.

No functional differences here, output not affected.

Signed-off-by: Stefano Brivio <sbrivio@redhat.com>
Reviewed-by: Sabrina Dubroca <sd@queasysnail.net>
---
 misc/ss.c | 397 ++++++++++++++++++++++++++++++++------------------------------
 1 file changed, 204 insertions(+), 193 deletions(-)

diff --git a/misc/ss.c b/misc/ss.c
index b5099d1e0e66..72e117ca9405 100644
--- a/misc/ss.c
+++ b/misc/ss.c
@@ -26,6 +26,7 @@
 #include <getopt.h>
 #include <stdbool.h>
 #include <limits.h>
+#include <stdarg.h>
 
 #include "utils.h"
 #include "rt_names.h"
@@ -822,6 +823,15 @@ static const char *vsock_netid_name(int type)
 	}
 }
 
+static void out(const char *fmt, ...)
+{
+	va_list args;
+
+	va_start(args, fmt);
+	vfprintf(stdout, fmt, args);
+	va_end(args);
+}
+
 static void sock_state_print(struct sockstat *s)
 {
 	const char *sock_name;
@@ -862,39 +872,39 @@ static void sock_state_print(struct sockstat *s)
 	}
 
 	if (netid_width)
-		printf("%-*s ", netid_width,
-		       is_sctp_assoc(s, sock_name) ? "" : sock_name);
+		out("%-*s ", netid_width,
+		    is_sctp_assoc(s, sock_name) ? "" : sock_name);
 	if (state_width) {
 		if (is_sctp_assoc(s, sock_name))
-			printf("`- %-*s ", state_width - 3,
-			       sctp_sstate_name[s->state]);
+			out("`- %-*s ", state_width - 3,
+			    sctp_sstate_name[s->state]);
 		else
-			printf("%-*s ", state_width, sstate_name[s->state]);
+			out("%-*s ", state_width, sstate_name[s->state]);
 	}
 
-	printf("%-6d %-6d %s", s->rq, s->wq, odd_width_pad);
+	out("%-6d %-6d %s", s->rq, s->wq, odd_width_pad);
 }
 
 static void sock_details_print(struct sockstat *s)
 {
 	if (s->uid)
-		printf(" uid:%u", s->uid);
+		out(" uid:%u", s->uid);
 
-	printf(" ino:%u", s->ino);
-	printf(" sk:%llx", s->sk);
+	out(" ino:%u", s->ino);
+	out(" sk:%llx", s->sk);
 
 	if (s->mark)
-		printf(" fwmark:0x%x", s->mark);
+		out(" fwmark:0x%x", s->mark);
 }
 
 static void sock_addr_print_width(int addr_len, const char *addr, char *delim,
 		int port_len, const char *port, const char *ifname)
 {
 	if (ifname) {
-		printf("%*s%%%s%s%-*s ", addr_len, addr, ifname, delim,
-				port_len, port);
+		out("%*s%%%s%s%-*s ", addr_len, addr, ifname, delim,
+		    port_len, port);
 	} else {
-		printf("%*s%s%-*s ", addr_len, addr, delim, port_len, port);
+		out("%*s%s%-*s ", addr_len, addr, delim, port_len, port);
 	}
 }
 
@@ -1792,12 +1802,12 @@ static void proc_ctx_print(struct sockstat *s)
 		if (find_entry(s->ino, &buf,
 				(show_proc_ctx & show_sock_ctx) ?
 				PROC_SOCK_CTX : PROC_CTX) > 0) {
-			printf(" users:(%s)", buf);
+			out(" users:(%s)", buf);
 			free(buf);
 		}
 	} else if (show_users) {
 		if (find_entry(s->ino, &buf, USERS) > 0) {
-			printf(" users:(%s)", buf);
+			out(" users:(%s)", buf);
 			free(buf);
 		}
 	}
@@ -1877,51 +1887,51 @@ static char *sprint_bw(char *buf, double bw)
 static void sctp_stats_print(struct sctp_info *s)
 {
 	if (s->sctpi_tag)
-		printf(" tag:%x", s->sctpi_tag);
+		out(" tag:%x", s->sctpi_tag);
 	if (s->sctpi_state)
-		printf(" state:%s", sctp_sstate_name[s->sctpi_state]);
+		out(" state:%s", sctp_sstate_name[s->sctpi_state]);
 	if (s->sctpi_rwnd)
-		printf(" rwnd:%d", s->sctpi_rwnd);
+		out(" rwnd:%d", s->sctpi_rwnd);
 	if (s->sctpi_unackdata)
-		printf(" unackdata:%d", s->sctpi_unackdata);
+		out(" unackdata:%d", s->sctpi_unackdata);
 	if (s->sctpi_penddata)
-		printf(" penddata:%d", s->sctpi_penddata);
+		out(" penddata:%d", s->sctpi_penddata);
 	if (s->sctpi_instrms)
-		printf(" instrms:%d", s->sctpi_instrms);
+		out(" instrms:%d", s->sctpi_instrms);
 	if (s->sctpi_outstrms)
-		printf(" outstrms:%d", s->sctpi_outstrms);
+		out(" outstrms:%d", s->sctpi_outstrms);
 	if (s->sctpi_inqueue)
-		printf(" inqueue:%d", s->sctpi_inqueue);
+		out(" inqueue:%d", s->sctpi_inqueue);
 	if (s->sctpi_outqueue)
-		printf(" outqueue:%d", s->sctpi_outqueue);
+		out(" outqueue:%d", s->sctpi_outqueue);
 	if (s->sctpi_overall_error)
-		printf(" overerr:%d", s->sctpi_overall_error);
+		out(" overerr:%d", s->sctpi_overall_error);
 	if (s->sctpi_max_burst)
-		printf(" maxburst:%d", s->sctpi_max_burst);
+		out(" maxburst:%d", s->sctpi_max_burst);
 	if (s->sctpi_maxseg)
-		printf(" maxseg:%d", s->sctpi_maxseg);
+		out(" maxseg:%d", s->sctpi_maxseg);
 	if (s->sctpi_peer_rwnd)
-		printf(" prwnd:%d", s->sctpi_peer_rwnd);
+		out(" prwnd:%d", s->sctpi_peer_rwnd);
 	if (s->sctpi_peer_tag)
-		printf(" ptag:%x", s->sctpi_peer_tag);
+		out(" ptag:%x", s->sctpi_peer_tag);
 	if (s->sctpi_peer_capable)
-		printf(" pcapable:%d", s->sctpi_peer_capable);
+		out(" pcapable:%d", s->sctpi_peer_capable);
 	if (s->sctpi_peer_sack)
-		printf(" psack:%d", s->sctpi_peer_sack);
+		out(" psack:%d", s->sctpi_peer_sack);
 	if (s->sctpi_s_autoclose)
-		printf(" autoclose:%d", s->sctpi_s_autoclose);
+		out(" autoclose:%d", s->sctpi_s_autoclose);
 	if (s->sctpi_s_adaptation_ind)
-		printf(" adapind:%d", s->sctpi_s_adaptation_ind);
+		out(" adapind:%d", s->sctpi_s_adaptation_ind);
 	if (s->sctpi_s_pd_point)
-		printf(" pdpoint:%d", s->sctpi_s_pd_point);
+		out(" pdpoint:%d", s->sctpi_s_pd_point);
 	if (s->sctpi_s_nodelay)
-		printf(" nodealy:%d", s->sctpi_s_nodelay);
+		out(" nodealy:%d", s->sctpi_s_nodelay);
 	if (s->sctpi_s_disable_fragments)
-		printf(" nofrag:%d", s->sctpi_s_disable_fragments);
+		out(" nofrag:%d", s->sctpi_s_disable_fragments);
 	if (s->sctpi_s_v4mapped)
-		printf(" v4mapped:%d", s->sctpi_s_v4mapped);
+		out(" v4mapped:%d", s->sctpi_s_v4mapped);
 	if (s->sctpi_s_frag_interleave)
-		printf(" fraginl:%d", s->sctpi_s_frag_interleave);
+		out(" fraginl:%d", s->sctpi_s_frag_interleave);
 }
 
 static void tcp_stats_print(struct tcpstat *s)
@@ -1929,65 +1939,65 @@ static void tcp_stats_print(struct tcpstat *s)
 	char b1[64];
 
 	if (s->has_ts_opt)
-		printf(" ts");
+		out(" ts");
 	if (s->has_sack_opt)
-		printf(" sack");
+		out(" sack");
 	if (s->has_ecn_opt)
-		printf(" ecn");
+		out(" ecn");
 	if (s->has_ecnseen_opt)
-		printf(" ecnseen");
+		out(" ecnseen");
 	if (s->has_fastopen_opt)
-		printf(" fastopen");
+		out(" fastopen");
 	if (s->cong_alg[0])
-		printf(" %s", s->cong_alg);
+		out(" %s", s->cong_alg);
 	if (s->has_wscale_opt)
-		printf(" wscale:%d,%d", s->snd_wscale, s->rcv_wscale);
+		out(" wscale:%d,%d", s->snd_wscale, s->rcv_wscale);
 	if (s->rto)
-		printf(" rto:%g", s->rto);
+		out(" rto:%g", s->rto);
 	if (s->backoff)
-		printf(" backoff:%u", s->backoff);
+		out(" backoff:%u", s->backoff);
 	if (s->rtt)
-		printf(" rtt:%g/%g", s->rtt, s->rttvar);
+		out(" rtt:%g/%g", s->rtt, s->rttvar);
 	if (s->ato)
-		printf(" ato:%g", s->ato);
+		out(" ato:%g", s->ato);
 
 	if (s->qack)
-		printf(" qack:%d", s->qack);
+		out(" qack:%d", s->qack);
 	if (s->qack & 1)
-		printf(" bidir");
+		out(" bidir");
 
 	if (s->mss)
-		printf(" mss:%d", s->mss);
+		out(" mss:%d", s->mss);
 	if (s->rcv_mss)
-		printf(" rcvmss:%d", s->rcv_mss);
+		out(" rcvmss:%d", s->rcv_mss);
 	if (s->advmss)
-		printf(" advmss:%d", s->advmss);
+		out(" advmss:%d", s->advmss);
 	if (s->cwnd)
-		printf(" cwnd:%u", s->cwnd);
+		out(" cwnd:%u", s->cwnd);
 	if (s->ssthresh)
-		printf(" ssthresh:%d", s->ssthresh);
+		out(" ssthresh:%d", s->ssthresh);
 
 	if (s->bytes_acked)
-		printf(" bytes_acked:%llu", s->bytes_acked);
+		out(" bytes_acked:%llu", s->bytes_acked);
 	if (s->bytes_received)
-		printf(" bytes_received:%llu", s->bytes_received);
+		out(" bytes_received:%llu", s->bytes_received);
 	if (s->segs_out)
-		printf(" segs_out:%u", s->segs_out);
+		out(" segs_out:%u", s->segs_out);
 	if (s->segs_in)
-		printf(" segs_in:%u", s->segs_in);
+		out(" segs_in:%u", s->segs_in);
 	if (s->data_segs_out)
-		printf(" data_segs_out:%u", s->data_segs_out);
+		out(" data_segs_out:%u", s->data_segs_out);
 	if (s->data_segs_in)
-		printf(" data_segs_in:%u", s->data_segs_in);
+		out(" data_segs_in:%u", s->data_segs_in);
 
 	if (s->dctcp && s->dctcp->enabled) {
 		struct dctcpstat *dctcp = s->dctcp;
 
-		printf(" dctcp:(ce_state:%u,alpha:%u,ab_ecn:%u,ab_tot:%u)",
-				dctcp->ce_state, dctcp->alpha, dctcp->ab_ecn,
-				dctcp->ab_tot);
+		out(" dctcp:(ce_state:%u,alpha:%u,ab_ecn:%u,ab_tot:%u)",
+			     dctcp->ce_state, dctcp->alpha, dctcp->ab_ecn,
+			     dctcp->ab_tot);
 	} else if (s->dctcp) {
-		printf(" dctcp:fallback_mode");
+		out(" dctcp:fallback_mode");
 	}
 
 	if (s->bbr_info) {
@@ -1997,71 +2007,70 @@ static void tcp_stats_print(struct tcpstat *s)
 		bw <<= 32;
 		bw |= s->bbr_info->bbr_bw_lo;
 
-		printf(" bbr:(bw:%sbps,mrtt:%g",
-		       sprint_bw(b1, bw * 8.0),
-		       (double)s->bbr_info->bbr_min_rtt / 1000.0);
+		out(" bbr:(bw:%sbps,mrtt:%g",
+		    sprint_bw(b1, bw * 8.0),
+		    (double)s->bbr_info->bbr_min_rtt / 1000.0);
 		if (s->bbr_info->bbr_pacing_gain)
-			printf(",pacing_gain:%g",
-			       (double)s->bbr_info->bbr_pacing_gain / 256.0);
+			out(",pacing_gain:%g",
+			    (double)s->bbr_info->bbr_pacing_gain / 256.0);
 		if (s->bbr_info->bbr_cwnd_gain)
-			printf(",cwnd_gain:%g",
-			       (double)s->bbr_info->bbr_cwnd_gain / 256.0);
-		printf(")");
+			out(",cwnd_gain:%g",
+			    (double)s->bbr_info->bbr_cwnd_gain / 256.0);
+		out(")");
 	}
 
 	if (s->send_bps)
-		printf(" send %sbps", sprint_bw(b1, s->send_bps));
+		out(" send %sbps", sprint_bw(b1, s->send_bps));
 	if (s->lastsnd)
-		printf(" lastsnd:%u", s->lastsnd);
+		out(" lastsnd:%u", s->lastsnd);
 	if (s->lastrcv)
-		printf(" lastrcv:%u", s->lastrcv);
+		out(" lastrcv:%u", s->lastrcv);
 	if (s->lastack)
-		printf(" lastack:%u", s->lastack);
+		out(" lastack:%u", s->lastack);
 
 	if (s->pacing_rate) {
-		printf(" pacing_rate %sbps", sprint_bw(b1, s->pacing_rate));
+		out(" pacing_rate %sbps", sprint_bw(b1, s->pacing_rate));
 		if (s->pacing_rate_max)
-				printf("/%sbps", sprint_bw(b1,
-							s->pacing_rate_max));
+			out("/%sbps", sprint_bw(b1, s->pacing_rate_max));
 	}
 
 	if (s->delivery_rate)
-		printf(" delivery_rate %sbps", sprint_bw(b1, s->delivery_rate));
+		out(" delivery_rate %sbps", sprint_bw(b1, s->delivery_rate));
 	if (s->app_limited)
-		printf(" app_limited");
+		out(" app_limited");
 
 	if (s->busy_time) {
-		printf(" busy:%llums", s->busy_time / 1000);
+		out(" busy:%llums", s->busy_time / 1000);
 		if (s->rwnd_limited)
-			printf(" rwnd_limited:%llums(%.1f%%)",
-			       s->rwnd_limited / 1000,
-			       100.0 * s->rwnd_limited / s->busy_time);
+			out(" rwnd_limited:%llums(%.1f%%)",
+			    s->rwnd_limited / 1000,
+			    100.0 * s->rwnd_limited / s->busy_time);
 		if (s->sndbuf_limited)
-			printf(" sndbuf_limited:%llums(%.1f%%)",
-			       s->sndbuf_limited / 1000,
-			       100.0 * s->sndbuf_limited / s->busy_time);
+			out(" sndbuf_limited:%llums(%.1f%%)",
+			    s->sndbuf_limited / 1000,
+			    100.0 * s->sndbuf_limited / s->busy_time);
 	}
 
 	if (s->unacked)
-		printf(" unacked:%u", s->unacked);
+		out(" unacked:%u", s->unacked);
 	if (s->retrans || s->retrans_total)
-		printf(" retrans:%u/%u", s->retrans, s->retrans_total);
+		out(" retrans:%u/%u", s->retrans, s->retrans_total);
 	if (s->lost)
-		printf(" lost:%u", s->lost);
+		out(" lost:%u", s->lost);
 	if (s->sacked && s->ss.state != SS_LISTEN)
-		printf(" sacked:%u", s->sacked);
+		out(" sacked:%u", s->sacked);
 	if (s->fackets)
-		printf(" fackets:%u", s->fackets);
+		out(" fackets:%u", s->fackets);
 	if (s->reordering != 3)
-		printf(" reordering:%d", s->reordering);
+		out(" reordering:%d", s->reordering);
 	if (s->rcv_rtt)
-		printf(" rcv_rtt:%g", s->rcv_rtt);
+		out(" rcv_rtt:%g", s->rcv_rtt);
 	if (s->rcv_space)
-		printf(" rcv_space:%d", s->rcv_space);
+		out(" rcv_space:%d", s->rcv_space);
 	if (s->not_sent)
-		printf(" notsent:%u", s->not_sent);
+		out(" notsent:%u", s->not_sent);
 	if (s->min_rtt)
-		printf(" minrtt:%g", s->min_rtt);
+		out(" minrtt:%g", s->min_rtt);
 }
 
 static void tcp_timer_print(struct tcpstat *s)
@@ -2078,18 +2087,18 @@ static void tcp_timer_print(struct tcpstat *s)
 	if (s->timer) {
 		if (s->timer > 4)
 			s->timer = 5;
-		printf(" timer:(%s,%s,%d)",
-				tmr_name[s->timer],
-				print_ms_timer(s->timeout),
-				s->retrans);
+		out(" timer:(%s,%s,%d)",
+			     tmr_name[s->timer],
+			     print_ms_timer(s->timeout),
+			     s->retrans);
 	}
 }
 
 static void sctp_timer_print(struct tcpstat *s)
 {
 	if (s->timer)
-		printf(" timer:(T3_RTX,%s,%d)",
-		       print_ms_timer(s->timeout), s->retrans);
+		out(" timer:(T3_RTX,%s,%d)",
+		    print_ms_timer(s->timeout), s->retrans);
 }
 
 static int tcp_show_line(char *line, const struct filter *f, int family)
@@ -2148,13 +2157,13 @@ static int tcp_show_line(char *line, const struct filter *f, int family)
 	if (show_details) {
 		sock_details_print(&s.ss);
 		if (opt[0])
-			printf(" opt:\"%s\"", opt);
+			out(" opt:\"%s\"", opt);
 	}
 
 	if (show_tcpinfo)
 		tcp_stats_print(&s);
 
-	printf("\n");
+	out("\n");
 	return 0;
 }
 
@@ -2197,44 +2206,44 @@ static void print_skmeminfo(struct rtattr *tb[], int attrtype)
 			const struct inet_diag_meminfo *minfo =
 				RTA_DATA(tb[INET_DIAG_MEMINFO]);
 
-			printf(" mem:(r%u,w%u,f%u,t%u)",
-					minfo->idiag_rmem,
-					minfo->idiag_wmem,
-					minfo->idiag_fmem,
-					minfo->idiag_tmem);
+			out(" mem:(r%u,w%u,f%u,t%u)",
+				   minfo->idiag_rmem,
+				   minfo->idiag_wmem,
+				   minfo->idiag_fmem,
+				   minfo->idiag_tmem);
 		}
 		return;
 	}
 
 	skmeminfo = RTA_DATA(tb[attrtype]);
 
-	printf(" skmem:(r%u,rb%u,t%u,tb%u,f%u,w%u,o%u",
-	       skmeminfo[SK_MEMINFO_RMEM_ALLOC],
-	       skmeminfo[SK_MEMINFO_RCVBUF],
-	       skmeminfo[SK_MEMINFO_WMEM_ALLOC],
-	       skmeminfo[SK_MEMINFO_SNDBUF],
-	       skmeminfo[SK_MEMINFO_FWD_ALLOC],
-	       skmeminfo[SK_MEMINFO_WMEM_QUEUED],
-	       skmeminfo[SK_MEMINFO_OPTMEM]);
+	out(" skmem:(r%u,rb%u,t%u,tb%u,f%u,w%u,o%u",
+		     skmeminfo[SK_MEMINFO_RMEM_ALLOC],
+		     skmeminfo[SK_MEMINFO_RCVBUF],
+		     skmeminfo[SK_MEMINFO_WMEM_ALLOC],
+		     skmeminfo[SK_MEMINFO_SNDBUF],
+		     skmeminfo[SK_MEMINFO_FWD_ALLOC],
+		     skmeminfo[SK_MEMINFO_WMEM_QUEUED],
+		     skmeminfo[SK_MEMINFO_OPTMEM]);
 
 	if (RTA_PAYLOAD(tb[attrtype]) >=
 		(SK_MEMINFO_BACKLOG + 1) * sizeof(__u32))
-		printf(",bl%u", skmeminfo[SK_MEMINFO_BACKLOG]);
+		out(",bl%u", skmeminfo[SK_MEMINFO_BACKLOG]);
 
 	if (RTA_PAYLOAD(tb[attrtype]) >=
 		(SK_MEMINFO_DROPS + 1) * sizeof(__u32))
-		printf(",d%u", skmeminfo[SK_MEMINFO_DROPS]);
+		out(",d%u", skmeminfo[SK_MEMINFO_DROPS]);
 
-	printf(")");
+	out(")");
 }
 
 static void print_md5sig(struct tcp_diag_md5sig *sig)
 {
-	printf("%s/%d=",
-	       format_host(sig->tcpm_family,
-			   sig->tcpm_family == AF_INET6 ? 16 : 4,
-			   &sig->tcpm_addr),
-	       sig->tcpm_prefixlen);
+	out("%s/%d=",
+	    format_host(sig->tcpm_family,
+			sig->tcpm_family == AF_INET6 ? 16 : 4,
+			&sig->tcpm_addr),
+	    sig->tcpm_prefixlen);
 	print_escape_buf(sig->tcpm_key, sig->tcpm_keylen, " ,");
 }
 
@@ -2379,10 +2388,10 @@ static void tcp_show_info(const struct nlmsghdr *nlh, struct inet_diag_msg *r,
 		struct tcp_diag_md5sig *sig = RTA_DATA(tb[INET_DIAG_MD5SIG]);
 		int len = RTA_PAYLOAD(tb[INET_DIAG_MD5SIG]);
 
-		printf(" md5keys:");
+		out(" md5keys:");
 		print_md5sig(sig++);
 		for (len -= sizeof(*sig); len > 0; len -= sizeof(*sig)) {
-			printf(",");
+			out(",");
 			print_md5sig(sig++);
 		}
 	}
@@ -2417,18 +2426,18 @@ static void sctp_show_info(const struct nlmsghdr *nlh, struct inet_diag_msg *r,
 		len = RTA_PAYLOAD(tb[INET_DIAG_LOCALS]);
 		sa = RTA_DATA(tb[INET_DIAG_LOCALS]);
 
-		printf("locals:%s", format_host_sa(sa));
+		out("locals:%s", format_host_sa(sa));
 		for (sa++, len -= sizeof(*sa); len > 0; sa++, len -= sizeof(*sa))
-			printf(",%s", format_host_sa(sa));
+			out(",%s", format_host_sa(sa));
 
 	}
 	if (tb[INET_DIAG_PEERS]) {
 		len = RTA_PAYLOAD(tb[INET_DIAG_PEERS]);
 		sa = RTA_DATA(tb[INET_DIAG_PEERS]);
 
-		printf(" peers:%s", format_host_sa(sa));
+		out(" peers:%s", format_host_sa(sa));
 		for (sa++, len -= sizeof(*sa); len > 0; sa++, len -= sizeof(*sa))
-			printf(",%s", format_host_sa(sa));
+			out(",%s", format_host_sa(sa));
 	}
 	if (tb[INET_DIAG_INFO]) {
 		struct sctp_info *info;
@@ -2515,18 +2524,19 @@ static int inet_show_sock(struct nlmsghdr *nlh,
 	if (show_details) {
 		sock_details_print(s);
 		if (s->local.family == AF_INET6 && tb[INET_DIAG_SKV6ONLY])
-			printf(" v6only:%u", v6only);
+			out(" v6only:%u", v6only);
 
 		if (tb[INET_DIAG_SHUTDOWN]) {
 			unsigned char mask;
 
 			mask = rta_getattr_u8(tb[INET_DIAG_SHUTDOWN]);
-			printf(" %c-%c", mask & 1 ? '-' : '<', mask & 2 ? '-' : '>');
+			out(" %c-%c",
+			    mask & 1 ? '-' : '<', mask & 2 ? '-' : '>');
 		}
 	}
 
 	if (show_mem || (show_tcpinfo && s->type != IPPROTO_UDP)) {
-		printf("\n\t");
+		out("\n\t");
 		if (s->type == IPPROTO_SCTP)
 			sctp_show_info(nlh, r, tb);
 		else
@@ -2534,7 +2544,7 @@ static int inet_show_sock(struct nlmsghdr *nlh,
 	}
 	sctp_ino = s->ino;
 
-	printf("\n");
+	out("\n");
 	return 0;
 }
 
@@ -2990,9 +3000,9 @@ static int dgram_show_line(char *line, const struct filter *f, int family)
 	inet_stats_print(&s, false);
 
 	if (show_details && opt[0])
-		printf(" opt:\"%s\"", opt);
+		out(" opt:\"%s\"", opt);
 
-	printf("\n");
+	out("\n");
 	return 0;
 }
 
@@ -3167,10 +3177,11 @@ static int unix_show_sock(const struct sockaddr_nl *addr, struct nlmsghdr *nlh,
 			unsigned char mask;
 
 			mask = rta_getattr_u8(tb[UNIX_DIAG_SHUTDOWN]);
-			printf(" %c-%c", mask & 1 ? '-' : '<', mask & 2 ? '-' : '>');
+			out(" %c-%c",
+			    mask & 1 ? '-' : '<', mask & 2 ? '-' : '>');
 		}
 	}
-	printf("\n");
+	out("\n");
 
 	return 0;
 }
@@ -3327,7 +3338,7 @@ static int unix_show(struct filter *f)
 		if (++cnt > MAX_UNIX_REMEMBER) {
 			while (list) {
 				unix_stats_print(list, f);
-				printf("\n");
+				out("\n");
 
 				unix_list_drop_first(&list);
 			}
@@ -3337,7 +3348,7 @@ static int unix_show(struct filter *f)
 	fclose(fp);
 	while (list) {
 		unix_stats_print(list, f);
-		printf("\n");
+		out("\n");
 
 		unix_list_drop_first(&list);
 	}
@@ -3383,12 +3394,12 @@ static int packet_stats_print(struct sockstat *s, const struct filter *f)
 
 static void packet_show_ring(struct packet_diag_ring *ring)
 {
-	printf("blk_size:%d", ring->pdr_block_size);
-	printf(",blk_nr:%d", ring->pdr_block_nr);
-	printf(",frm_size:%d", ring->pdr_frame_size);
-	printf(",frm_nr:%d", ring->pdr_frame_nr);
-	printf(",tmo:%d", ring->pdr_retire_tmo);
-	printf(",features:0x%x", ring->pdr_features);
+	out("blk_size:%d", ring->pdr_block_size);
+	out(",blk_nr:%d", ring->pdr_block_nr);
+	out(",frm_size:%d", ring->pdr_frame_size);
+	out(",frm_nr:%d", ring->pdr_frame_nr);
+	out(",tmo:%d", ring->pdr_retire_tmo);
+	out(",features:0x%x", ring->pdr_features);
 }
 
 static int packet_show_sock(const struct sockaddr_nl *addr,
@@ -3446,56 +3457,56 @@ static int packet_show_sock(const struct sockaddr_nl *addr,
 
 	if (show_details) {
 		if (pinfo) {
-			printf("\n\tver:%d", pinfo->pdi_version);
-			printf(" cpy_thresh:%d", pinfo->pdi_copy_thresh);
-			printf(" flags( ");
+			out("\n\tver:%d", pinfo->pdi_version);
+			out(" cpy_thresh:%d", pinfo->pdi_copy_thresh);
+			out(" flags( ");
 			if (pinfo->pdi_flags & PDI_RUNNING)
-				printf("running");
+				out("running");
 			if (pinfo->pdi_flags & PDI_AUXDATA)
-				printf(" auxdata");
+				out(" auxdata");
 			if (pinfo->pdi_flags & PDI_ORIGDEV)
-				printf(" origdev");
+				out(" origdev");
 			if (pinfo->pdi_flags & PDI_VNETHDR)
-				printf(" vnethdr");
+				out(" vnethdr");
 			if (pinfo->pdi_flags & PDI_LOSS)
-				printf(" loss");
+				out(" loss");
 			if (!pinfo->pdi_flags)
-				printf("0");
-			printf(" )");
+				out("0");
+			out(" )");
 		}
 		if (ring_rx) {
-			printf("\n\tring_rx(");
+			out("\n\tring_rx(");
 			packet_show_ring(ring_rx);
-			printf(")");
+			out(")");
 		}
 		if (ring_tx) {
-			printf("\n\tring_tx(");
+			out("\n\tring_tx(");
 			packet_show_ring(ring_tx);
-			printf(")");
+			out(")");
 		}
 		if (has_fanout) {
 			uint16_t type = (fanout >> 16) & 0xffff;
 
-			printf("\n\tfanout(");
-			printf("id:%d,", fanout & 0xffff);
-			printf("type:");
+			out("\n\tfanout(");
+			out("id:%d,", fanout & 0xffff);
+			out("type:");
 
 			if (type == 0)
-				printf("hash");
+				out("hash");
 			else if (type == 1)
-				printf("lb");
+				out("lb");
 			else if (type == 2)
-				printf("cpu");
+				out("cpu");
 			else if (type == 3)
-				printf("roll");
+				out("roll");
 			else if (type == 4)
-				printf("random");
+				out("random");
 			else if (type == 5)
-				printf("qm");
+				out("qm");
 			else
-				printf("0x%x", type);
+				out("0x%x", type);
 
-			printf(")");
+			out(")");
 		}
 	}
 
@@ -3505,15 +3516,15 @@ static int packet_show_sock(const struct sockaddr_nl *addr,
 		int num = RTA_PAYLOAD(tb[PACKET_DIAG_FILTER]) /
 			  sizeof(struct sock_filter);
 
-		printf("\n\tbpf filter (%d): ", num);
+		out("\n\tbpf filter (%d): ", num);
 		while (num) {
-			printf(" 0x%02x %u %u %u,",
-			      fil->code, fil->jt, fil->jf, fil->k);
+			out(" 0x%02x %u %u %u,",
+			    fil->code, fil->jt, fil->jf, fil->k);
 			num--;
 			fil++;
 		}
 	}
-	printf("\n");
+	out("\n");
 	return 0;
 }
 
@@ -3556,7 +3567,7 @@ static int packet_show_line(char *buf, const struct filter *f, int fam)
 	if (packet_stats_print(&stat, f))
 		return 0;
 
-	printf("\n");
+	out("\n");
 	return 0;
 }
 
@@ -3669,14 +3680,14 @@ static int netlink_show_one(struct filter *f,
 		else if (pid > 0)
 			getpidcon(pid, &pid_context);
 
-		printf(" proc_ctx=%s", pid_context ? : "unavailable");
+		out(" proc_ctx=%s", pid_context ? : "unavailable");
 		free(pid_context);
 	}
 
 	if (show_details) {
-		printf(" sk=%llx cb=%llx groups=0x%08x", sk, cb, groups);
+		out(" sk=%llx cb=%llx groups=0x%08x", sk, cb, groups);
 	}
-	printf("\n");
+	out("\n");
 
 	return 0;
 }
@@ -3712,9 +3723,9 @@ static int netlink_show_sock(const struct sockaddr_nl *addr,
 	}
 
 	if (show_mem) {
-		printf("\t");
+		out("\t");
 		print_skmeminfo(tb, NETLINK_DIAG_MEMINFO);
-		printf("\n");
+		out("\n");
 	}
 
 	return 0;
@@ -3805,7 +3816,7 @@ static void vsock_stats_print(struct sockstat *s, struct filter *f)
 
 	proc_ctx_print(s);
 
-	printf("\n");
+	out("\n");
 }
 
 static int vsock_show_sock(const struct sockaddr_nl *addr,
@@ -4570,10 +4581,10 @@ int main(int argc, char *argv[])
 
 	if (show_header) {
 		if (netid_width)
-			printf("%-*s ", netid_width, "Netid");
+			out("%-*s ", netid_width, "Netid");
 		if (state_width)
-			printf("%-*s ", state_width, "State");
-		printf("%-6s %-6s %s", "Recv-Q", "Send-Q", odd_width_pad);
+			out("%-*s ", state_width, "State");
+		out("%-6s %-6s %s", "Recv-Q", "Send-Q", odd_width_pad);
 	}
 
 	/* Make enough space for the local/remote port field */
@@ -4581,9 +4592,9 @@ int main(int argc, char *argv[])
 	serv_width += 13;
 
 	if (show_header) {
-		printf("%*s:%-*s %*s:%-*s\n",
-		       addr_width, "Local Address", serv_width, "Port",
-		       addr_width, "Peer Address", serv_width, "Port");
+		out("%*s:%-*s %*s:%-*s\n",
+		    addr_width, "Local Address", serv_width, "Port",
+		    addr_width, "Peer Address", serv_width, "Port");
 	}
 
 	fflush(stdout);
-- 
2.9.4