ip lib: Added shorter timestamp option

Added another timestamp format to look like more logging info:

[2014-12-22T22:36:50.489 ] 2: enp0s25: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc pfifo_fast state UP group default
    link/ether 3c:97:0e:a3:86:2e brd ff:ff:ff:ff:ff:ff

Signed-off-by: Vadim Kochan <vadim4j@gmail.com>

include/utils.h

@@ -19,6 +19,7 @@ extern int show_raw;
 extern int resolve_hosts;
 extern int oneline;
 extern int timestamp;
+extern int timestamp_short;
 extern char * _SL_;
 extern int max_flush_loops;
 extern int batch_mode;

ip/ip.c

@@ -53,7 +53,7 @@ static void usage(void)
 "                    -f[amily] { inet | inet6 | ipx | dnet | bridge | link } |\n"
 "                    -4 | -6 | -I | -D | -B | -0 |\n"
 "                    -l[oops] { maximum-addr-flush-attempts } |\n"
-"                    -o[neline] | -t[imestamp] | -b[atch] [filename] |\n"
+"                    -o[neline] | -t[imestamp] | -t[short] | -b[atch] [filename] |\n"
 "                    -rc[vbuf] [size]}\n");
 	exit(-1);
 }
@@ -232,6 +232,9 @@ int main(int argc, char **argv)
 			++oneline;
 		} else if (matches(opt, "-timestamp") == 0) {
 			++timestamp;
+		} else if (matches(opt, "-tshort") == 0) {
+			++timestamp;
+			++timestamp_short;
 #if 0
 		} else if (matches(opt, "-numeric") == 0) {
 			rtnl_names_numeric++;

lib/utils.c

@@ -32,6 +32,8 @@
 
 #include "utils.h"
 
+int timestamp_short = 0;
+
 int get_integer(int *val, const char *arg, int base)
 {
 	long res;
@@ -772,14 +774,24 @@ __u8* hexstring_a2n(const char *str, __u8 *buf, int blen)
 int print_timestamp(FILE *fp)
 {
 	struct timeval tv;
-	char *tstr;
+	struct tm *tm;
 
-	memset(&tv, 0, sizeof(tv));
 	gettimeofday(&tv, NULL);
+	tm = localtime(&tv.tv_sec);
+
+	if (timestamp_short) {
+		char tshort[40];
+
+		strftime(tshort, sizeof(tshort), "%Y-%m-%dT%H:%M:%S", tm);
+		fprintf(fp, "[%s.%06ld] ", tshort, tv.tv_usec);
+	} else {
+		char *tstr = asctime(tm);
+
+		tstr[strlen(tstr)-1] = 0;
+		fprintf(fp, "Timestamp: %s %ld usec\n",
+			tstr, tv.tv_usec);
+	}
 
-	tstr = asctime(localtime(&tv.tv_sec));
-	tstr[strlen(tstr)-1] = 0;
-	fprintf(fp, "Timestamp: %s %ld usec\n", tstr, (long)tv.tv_usec);
 	return 0;
 }
 

man/man8/ip-monitor.8

@@ -16,6 +16,19 @@ ip-monitor, rtmon \- state monitoring
 ]
 .sp
 
+.SH OPTIONS
+
+.TP
+.BR "\-t" , " \-timestamp"
+Prints timestamp before the event message on the separated line in format:
+    Timestamp: <Day> <Month> <DD> <hh:mm:ss> <YYYY> <usecs> usec
+    <EVENT>
+
+.TP
+.BR "\-ts" , " \-tshort"
+Prints short timestamp before the event message on the same line in format:
+    [<YYYY>-<MM>-<DD>T<hh:mm:ss>.<ms>] <EVENT>
+
 .SH DESCRIPTION
 The
 .B ip