From eb89dafd0d72a1c3816b9b3bb79f10e43d023056 Mon Sep 17 00:00:00 2001
From: Ian Gulliver <flamingcow@gmail.com>
Date: Mon, 7 Mar 2016 20:12:35 -0800
Subject: [PATCH] Add --log-timestamps

---
 adsbus/adsbus.c |  5 +++++
 adsbus/log.c    | 21 ++++++++++++++++++++-
 adsbus/log.h    |  1 +
 3 files changed, 26 insertions(+), 1 deletion(-)

diff --git a/adsbus/adsbus.c b/adsbus/adsbus.c
index 06a4888..88353ea 100644
--- a/adsbus/adsbus.c
+++ b/adsbus/adsbus.c
@@ -78,6 +78,7 @@ static bool parse_opts(int argc, char *argv[]) {
 		{"stdin",                no_argument,       0, 'i'},
 		{"stdout",               required_argument, 0, 'o'},
 		{"log-file",             required_argument, 0, '1'},
+		{"log-timestamps",       no_argument,       0, '2'},
 		{0,                      0,                 0, 0  },
 	};
 
@@ -153,6 +154,10 @@ static bool parse_opts(int argc, char *argv[]) {
 				handler = log_reopen;
 				break;
 
+			case '2':
+				handler = log_enable_timestamps;
+				break;
+
 			case 'h':
 			default:
 				print_usage(argv[0]);
diff --git a/adsbus/log.c b/adsbus/log.c
index cfc7595..2fe02f1 100644
--- a/adsbus/log.c
+++ b/adsbus/log.c
@@ -1,11 +1,14 @@
 #include <assert.h>
 #include <signal.h>
 #include <stdarg.h>
+#include <stdbool.h>
 #include <stdio.h>
 #include <stdlib.h>
 #include <string.h>
 #include <sys/socket.h>
+#include <sys/stat.h>
 #include <sys/types.h>
+#include <time.h>
 #include <unistd.h>
 
 #include "log.h"
@@ -19,6 +22,7 @@ static char *log_path = NULL;
 static uint8_t log_id[UUID_LEN];
 static int log_rotate_fd;
 static struct peer log_rotate_peer;
+static bool log_timestamps = false;
 
 static char log_module = 'L';
 
@@ -90,10 +94,25 @@ bool log_reopen(const char *path) {
 	return true;
 }
 
+bool log_enable_timestamps(const char __attribute__ ((unused)) *arg) {
+	log_timestamps = true;
+	return true;
+}
+
 void log_write(char type, const char *loc, const uint8_t *id, const char *fmt, ...) {
 	va_list ap;
 	va_start(ap, fmt);
-	assert(fprintf(log_stream, "%c [%18s] %s: ", type, loc, id) > 0);
+
+	char datetime[64] = "";
+	if (log_timestamps) {
+		time_t now;
+		assert(time(&now) >= 0);
+		struct tm tmnow;
+		assert(gmtime_r(&now, &tmnow));
+		assert(strftime(datetime, sizeof(datetime), "%FT%TZ ", &tmnow) > 0);
+	}
+
+	assert(fprintf(log_stream, "%s[%18s] %c %s: ", datetime, loc, type, id) > 0);
 	assert(vfprintf(log_stream, fmt, ap) > 0);
 	assert(fprintf(log_stream, "\n") == 1);
 	va_end(ap);
diff --git a/adsbus/log.h b/adsbus/log.h
index 47002da..5c9c5a8 100644
--- a/adsbus/log.h
+++ b/adsbus/log.h
@@ -11,5 +11,6 @@ void log_init(void);
 void log_init2(void);
 void log_cleanup(void);
 bool log_reopen(const char *);
+bool log_enable_timestamps(const char *);
 void log_write(char, const char *, const uint8_t *, const char *, ...)
 		__attribute__ ((__format__ (__printf__, 4, 5)));