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Don't print timestamps to a buffer and then print the buffer.

Browse Source 
Just directly print them.  This means:

	1) we don't have to worry about making a big enough buffer;

	2) we don't get annoying warnings about string truncation
	   due to invalid timestamp values;

	3) we use a constant string as a format, so that the compiler
	   can more easily do format string vs. format argument checks.
This commit is contained in:
Guy Harris 2018-07-29 19:16:42 -07:00
parent 3712d81876
commit 230e0b8577
1 changed files with 31 additions and 54 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

83
util-print.c
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@ -61,12 +61,6 @@ int32_t thiszone; /* seconds offset from gmt to local time */
/* invalid string to print '(invalid)' for malformed or corrupted packets */
const char istr[] = " (invalid)";
/*
* timestamp display buffer size, the biggest size of both formats is needed
* sizeof("0000000000.000000000") > sizeof("00:00:00.000000000")
*/
#define TS_BUF_SIZE sizeof("0000000000.000000000")
#define TOKBUFSIZE 128
/*
@ -235,77 +229,59 @@ nd_printzp(netdissect_options *ndo,
}
/*
* Format the timestamp
* Print the timestamp as HH:MM:SS.FRAC.
*/
static char *
ts_format(netdissect_options *ndo
#ifndef HAVE_PCAP_SET_TSTAMP_PRECISION
_U_
#endif
, int sec, int usec, char *buf)
static void
ts_hmsfrac_print(netdissect_options *ndo, int sec, int usec)
{
const char *format;
#ifdef HAVE_PCAP_SET_TSTAMP_PRECISION
switch (ndo->ndo_tstamp_precision) {
case PCAP_TSTAMP_PRECISION_MICRO:
format = "%02d:%02d:%02d.%06u";
ND_PRINT("%02d:%02d:%02d.%06u", sec / 3600, (sec % 3600) / 60,
sec % 60, usec);
break;
case PCAP_TSTAMP_PRECISION_NANO:
format = "%02d:%02d:%02d.%09u";
ND_PRINT("%02d:%02d:%02d.%09u", sec / 3600, (sec % 3600) / 60,
sec % 60, usec);
break;
default:
format = "%02d:%02d:%02d.{unknown}";
ND_PRINT("%02d:%02d:%02d.{unknown}", sec / 3600, (sec % 3600) / 60,
sec % 60);
break;
}
#else
format = "%02d:%02d:%02d.%06u";
ND_PRINT("%02d:%02d:%02d.%06u", sec / 3600, (sec % 3600) / 60,
sec % 60, usec);
#endif
nd_snprintf(buf, TS_BUF_SIZE, format,
sec / 3600, (sec % 3600) / 60, sec % 60, usec);
return buf;
}
/*
* Format the timestamp - Unix timeval style
* Print the timestamp - Unix timeval style, as SECS.FRAC.
*/
static char *
ts_unix_format(netdissect_options *ndo
#ifndef HAVE_PCAP_SET_TSTAMP_PRECISION
_U_
#endif
, int sec, int usec, char *buf)
static void
ts_unix_print(netdissect_options *ndo, int sec, int usec)
{
const char *format;
#ifdef HAVE_PCAP_SET_TSTAMP_PRECISION
switch (ndo->ndo_tstamp_precision) {
case PCAP_TSTAMP_PRECISION_MICRO:
format = "%u.%06u";
ND_PRINT("%u.%06u", (unsigned)sec, (unsigned)usec);
break;
case PCAP_TSTAMP_PRECISION_NANO:
format = "%u.%09u";
ND_PRINT("%u.%09u", (unsigned)sec, (unsigned)usec);
break;
default:
format = "%u.{unknown}";
ND_PRINT("%u.{unknown}", (unsigned)sec);
break;
}
#else
format = "%u.%06u";
ND_PRINT("%u.%06u", (unsigned)sec, (unsigned)usec);
#endif
nd_snprintf(buf, TS_BUF_SIZE, format,
(unsigned)sec, (unsigned)usec);
return buf;
}
/*
@ -318,7 +294,6 @@ ts_print(netdissect_options *ndo,
int s;
struct tm *tm;
time_t Time;
char buf[TS_BUF_SIZE];
static struct timeval tv_ref;
struct timeval tv_result;
int negative_offset;
@ -328,15 +303,16 @@ ts_print(netdissect_options *ndo,
case 0: /* Default */
s = (tvp->tv_sec + thiszone) % 86400;
ND_PRINT("%s ", ts_format(ndo, s, tvp->tv_usec, buf));
ts_hmsfrac_print(ndo, s, tvp->tv_usec);
ND_PRINT(" ");
break;
case 1: /* No time stamp */
break;
case 2: /* Unix timeval style */
ND_PRINT("%s ", ts_unix_format(ndo,
tvp->tv_sec, tvp->tv_usec, buf));
ts_unix_print(ndo, tvp->tv_sec, tvp->tv_usec);
ND_PRINT(" ");
break;
case 3: /* Microseconds/nanoseconds since previous packet */
@ -366,9 +342,8 @@ ts_print(netdissect_options *ndo,
netdissect_timevalsub(tvp, &tv_ref, &tv_result, nano_prec);
ND_PRINT((negative_offset ? "-" : " "));
ND_PRINT("%s ", ts_format(ndo,
tv_result.tv_sec, tv_result.tv_usec, buf));
ts_hmsfrac_print(ndo, tv_result.tv_sec, tv_result.tv_usec);
ND_PRINT(" ");
if (ndo->ndo_tflag == 3)
tv_ref = *tvp; /* set timestamp for previous packet */
@ -380,10 +355,12 @@ ts_print(netdissect_options *ndo,
tm = gmtime (&Time);
if (!tm)
ND_PRINT("Date fail ");
else
ND_PRINT("%04d-%02d-%02d %s ",
tm->tm_year+1900, tm->tm_mon+1, tm->tm_mday,
ts_format(ndo, s, tvp->tv_usec, buf));
else {
ND_PRINT("%04d-%02d-%02d ",
tm->tm_year+1900, tm->tm_mon+1, tm->tm_mday);
ts_hmsfrac_print(ndo, s, tvp->tv_usec);
ND_PRINT(" ");
}
break;
}
}