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capinfos: fix absolute and relative time display. 

Make the buffers big enough to handle the largest possible time values
you can get with a 64-bit time_t.

Don't cast the seconds value to unsigned long; it's probably signed, and
may not fit in an unsigned long (64-bit on an ILP32 or LLP64 platform),
so cast it to gint64 and print using G_GINT64_MODIFIER followed by "d".

Bug: 16519
Change-Id: I3ab79dfa086d2c4dfb6b93eba8cef3bdce731731
Reviewed-on: https://code.wireshark.org/review/36971
Petri-Dish: Guy Harris <gharris@sonic.net>
Tested-by: Petri Dish Buildbot
Reviewed-by: Guy Harris <gharris@sonic.net>
This commit is contained in:
Guy Harris 2020-04-29 11:24:45 -07:00 committed by Guy Harris
parent 0eb92d7aa0
commit 928bbf5984
1 changed files with 65 additions and 26 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

91
capinfos.c
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@ -300,7 +300,37 @@ order_string(order_t order)
static gchar *
absolute_time_string(nstime_t *timer, int tsprecision, capture_info *cf_info)
{
static gchar time_string_buf[4+1+2+1+2+1+2+1+2+1+2+1+9+1+1];
/*
* https://web.archive.org/web/20120513133703/http://www.idrbt.ac.in/publications/workingpapers/Working%20Paper%20No.%209.pdf
*
* says:
*
* A 64-bit Unix time would be safe for the indefinite future, as
* this variable would not overflow until 2**63 or
* 9,223,372,036,854,775,808 (over nine quintillion) seconds
* after the beginning of the Unix epoch - corresponding to
* GMT 15:30:08, Sunday, 4th December, 292,277,026,596.
*
* So, if we're displaying the time as YYYY-MM-DD HH:MM:SS.SSSSSSSSS,
* we'll have the buffer be large enouth for a date of the format
* 292277026596-MM-DD HH:MM:SS.SSSSSSSSS, which is the biggest value
* you'll get with a 64-bit time_t and a nanosecond-resolution
* fraction-of-a-second.
*
* That's 12+1+2+1+2+1+2+1+2+2+2+1+9+1, including the terminating
* \0, or 39.
*
* If we're displaying the time as epoch time, and the time is
* unsigned, 2^64-1 is 18446744073709551615, so the buffer has
* to be big enough for 18446744073709551615.999999999. That's
* 20+1+9+1, including the terminating '\0', or 31. If it's
* signed, 2^63 is 9223372036854775808, so the buffer has to
* be big enough for -9223372036854775808.999999999, which is
* again 20+1+9+1, or 31.
*
* So we go with 39.
*/
static gchar time_string_buf[39];
struct tm *ti_tm;
if (cf_info->times_known && cf_info->packet_count > 0) {
@ -309,46 +339,46 @@ absolute_time_string(nstime_t *timer, int tsprecision, capture_info *cf_info)
case WTAP_TSPREC_SEC:
g_snprintf(time_string_buf, sizeof time_string_buf,
"%lu",
(unsigned long)timer->secs);
"%"G_GINT64_MODIFIER"d",
(gint64)timer->secs);
break;
case WTAP_TSPREC_DSEC:
g_snprintf(time_string_buf, sizeof time_string_buf,
"%lu%s%01d",
(unsigned long)timer->secs,
"%"G_GINT64_MODIFIER"d%s%01d",
(gint64)timer->secs,
decimal_point,
timer->nsecs / 100000000);
break;
case WTAP_TSPREC_CSEC:
g_snprintf(time_string_buf, sizeof time_string_buf,
"%lu%s%02d",
(unsigned long)timer->secs,
"%"G_GINT64_MODIFIER"d%s%02d",
(gint64)timer->secs,
decimal_point,
timer->nsecs / 10000000);
break;
case WTAP_TSPREC_MSEC:
g_snprintf(time_string_buf, sizeof time_string_buf,
"%lu%s%03d",
(unsigned long)timer->secs,
"%"G_GINT64_MODIFIER"d%s%03d",
(gint64)timer->secs,
decimal_point,
timer->nsecs / 1000000);
break;
case WTAP_TSPREC_USEC:
g_snprintf(time_string_buf, sizeof time_string_buf,
"%lu%s%06d",
(unsigned long)timer->secs,
"%"G_GINT64_MODIFIER"d%s%06d",
(gint64)timer->secs,
decimal_point,
timer->nsecs / 1000);
break;
case WTAP_TSPREC_NSEC:
g_snprintf(time_string_buf, sizeof time_string_buf,
"%lu%s%09d",
(unsigned long)timer->secs,
"%"G_GINT64_MODIFIER"d%s%09d",
(gint64)timer->secs,
decimal_point,
timer->nsecs);
break;
@ -463,23 +493,32 @@ relative_time_string(nstime_t *timer, int tsprecision, capture_info *cf_info, gb
{
const gchar *second = want_seconds ? " second" : "";
const gchar *plural = want_seconds ? "s" : "";
static gchar time_string_buf[4+1+2+1+2+1+2+1+2+1+2+1+1];
/*
* If we're displaying the time as epoch time, and the time is
* unsigned, 2^64-1 is 18446744073709551615, so the buffer has
* to be big enough for "18446744073709551615.999999999 seconds".
* That's 20+1+9+1+7+1, including the terminating '\0', or 39.
* If it'ssigned, 2^63 is 9223372036854775808, so the buffer has to
* be big enough for "-9223372036854775808.999999999 seconds",
* which is again 20+1+9+1+7+1, or 39.
*/
static gchar time_string_buf[39];
if (cf_info->times_known && cf_info->packet_count > 0) {
switch (tsprecision) {
case WTAP_TSPREC_SEC:
g_snprintf(time_string_buf, sizeof time_string_buf,
"%lu%s%s",
(unsigned long)timer->secs,
"%"G_GINT64_MODIFIER"d%s%s",
(gint64)timer->secs,
second,
timer->secs == 1 ? "" : plural);
break;
case WTAP_TSPREC_DSEC:
g_snprintf(time_string_buf, sizeof time_string_buf,
"%lu%s%01d%s%s",
(unsigned long)timer->secs,
"%"G_GINT64_MODIFIER"d%s%01d%s%s",
(gint64)timer->secs,
decimal_point,
timer->nsecs / 100000000,
second,
@ -488,8 +527,8 @@ relative_time_string(nstime_t *timer, int tsprecision, capture_info *cf_info, gb
case WTAP_TSPREC_CSEC:
g_snprintf(time_string_buf, sizeof time_string_buf,
"%lu%s%02d%s%s",
(unsigned long)timer->secs,
"%"G_GINT64_MODIFIER"d%s%02d%s%s",
(gint64)timer->secs,
decimal_point,
timer->nsecs / 10000000,
second,
@ -498,8 +537,8 @@ relative_time_string(nstime_t *timer, int tsprecision, capture_info *cf_info, gb
case WTAP_TSPREC_MSEC:
g_snprintf(time_string_buf, sizeof time_string_buf,
"%lu%s%03d%s%s",
(unsigned long)timer->secs,
"%"G_GINT64_MODIFIER"d%s%03d%s%s",
(gint64)timer->secs,
decimal_point,
timer->nsecs / 1000000,
second,
@ -508,8 +547,8 @@ relative_time_string(nstime_t *timer, int tsprecision, capture_info *cf_info, gb
case WTAP_TSPREC_USEC:
g_snprintf(time_string_buf, sizeof time_string_buf,
"%lu%s%06d%s%s",
(unsigned long)timer->secs,
"%"G_GINT64_MODIFIER"d%s%06d%s%s",
(gint64)timer->secs,
decimal_point,
timer->nsecs / 1000,
second,
@ -518,8 +557,8 @@ relative_time_string(nstime_t *timer, int tsprecision, capture_info *cf_info, gb
case WTAP_TSPREC_NSEC:
g_snprintf(time_string_buf, sizeof time_string_buf,
"%lu%s%09d%s%s",
(unsigned long)timer->secs,
"%"G_GINT64_MODIFIER"d%s%09d%s%s",
(gint64)timer->secs,
decimal_point,
timer->nsecs,
second,