From: Jérémie Galarneau <jeremie.galarneau@efficios.com>
Date: Mon, 9 Sep 2019 16:14:54 +0000 (-0400)
Subject: Clean-up: format using remaining buffer len rather than total len
X-Git-Tag: v2.12.0-rc1~423
X-Git-Url: http://git.lttng.org/?p=lttng-tools.git;a=commitdiff_plain;h=6e7e504882cc5ca7549459d1ecafa69d3242d2d5

Clean-up: format using remaining buffer len rather than total len

end_datetime_suffix is has an extra byte to contain a '-' prefix.
This means that its effective length is ISO8601_STR_LEN and not its
sizeof(). This is not considered a fix as time_to_iso8601_str() does
not write more than ISO8601_STR_LEN (for time being).

The ISO8601_STR_LEN macro is used for the buffer lengths for clarity;
no behaviour change is intended.

Signed-off-by: Jérémie Galarneau <jeremie.galarneau@efficios.com>
---

diff --git a/src/common/trace-chunk.c b/src/common/trace-chunk.c
index 9f0919a88..f7a4372b4 100644
--- a/src/common/trace-chunk.c
+++ b/src/common/trace-chunk.c
@@ -165,8 +165,9 @@ char *generate_chunk_name(uint64_t chunk_id, time_t creation_timestamp,
 {
 	int ret = 0;
 	char *new_name= NULL;
-	char start_datetime[sizeof("YYYYmmddTHHMMSS+HHMM")] = {};
-	char end_datetime_suffix[sizeof("-YYYYmmddTHHMMSS+HHMM")] = {};
+	char start_datetime[ISO8601_STR_LEN] = {};
+	/* Add 1 for a '-' prefix. */
+	char end_datetime_suffix[ISO8601_STR_LEN + 1] = {};
 
 	ret = time_to_iso8601_str(
 			creation_timestamp,
@@ -180,7 +181,7 @@ char *generate_chunk_name(uint64_t chunk_id, time_t creation_timestamp,
 		ret = time_to_iso8601_str(
 				*close_timestamp,
 				end_datetime_suffix + 1,
-				sizeof(end_datetime_suffix));
+				sizeof(end_datetime_suffix) - 1);
 		if (ret) {
 			ERR("Failed to format trace chunk end date time");
 			goto error;