133 lines
2.9 KiB
C
133 lines
2.9 KiB
C
/*
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* prettydate - convert a time stamp to something readable
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*/
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#include <stdio.h>
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#include "ntp_fp.h"
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#include "ntp_unixtime.h" /* includes <sys/time.h> */
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#include "lib_strbuf.h"
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#include "ntp_stdlib.h"
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static const char *months[] = {
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"Jan", "Feb", "Mar", "Apr", "May", "Jun",
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"Jul", "Aug", "Sep", "Oct", "Nov", "Dec"
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};
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static const char *days[] = {
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"Sun", "Mon", "Tue", "Wed", "Thu", "Fri", "Sat"
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};
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/* Helper function to handle possible wraparound of the ntp epoch.
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Works by assuming that the localtime/gmtime library functions
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have been updated so that they work
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*/
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#define MAX_EPOCH_NR 1000
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struct tm *
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ntp2unix_tm(
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u_long ntp, int local
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)
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{
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time_t t, curr;
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struct tm *tm;
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int curr_year, epoch_nr;
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/* First get the current year: */
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curr = time(NULL);
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tm = local ? localtime(&curr) : gmtime(&curr);
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if (!tm) return NULL;
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curr_year = 1900 + tm->tm_year;
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/* Convert the ntp timestamp to a unix utc seconds count: */
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t = (time_t) ntp - JAN_1970;
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/* Check that the ntp timestamp is not before a 136 year window centered
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around the current year:
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Failsafe in case of an infinite loop:
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Allow up to 1000 epochs of 136 years each!
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*/
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for (epoch_nr = 0; epoch_nr < MAX_EPOCH_NR; epoch_nr++) {
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tm = local ? localtime(&t) : gmtime(&t);
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#if SIZEOF_TIME_T < 4
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# include "Bletch: sizeof(time_t) < 4!"
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#endif
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#if SIZEOF_TIME_T == 4
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/* If 32 bits, then year is 1970-2038, so no sense looking */
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epoch_nr = MAX_EPOCH_NR;
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#else /* SIZEOF_TIME_T > 4 */
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/* Check that the resulting year is in the correct epoch: */
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if (1900 + tm->tm_year > curr_year - 68) break;
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/* Epoch wraparound: Add 2^32 seconds! */
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t += (time_t) 65536 << 16;
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#endif /* SIZEOF_TIME_T > 4 */
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}
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return tm;
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}
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char *
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prettydate(
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l_fp *ts
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)
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{
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char *bp;
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struct tm *tm;
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time_t sec;
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u_long msec;
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LIB_GETBUF(bp);
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sec = ts->l_ui;
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msec = ts->l_uf / 4294967; /* fract / (2 ** 32 / 1000) */
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tm = ntp2unix_tm(sec, 1);
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if (!tm) {
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(void) sprintf(bp, "%08lx.%08lx --- --- -- ---- --:--:--",
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(u_long)ts->l_ui, (u_long)ts->l_uf);
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}
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else {
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(void) sprintf(bp, "%08lx.%08lx %s, %s %2d %4d %2d:%02d:%02d.%03lu",
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(u_long)ts->l_ui, (u_long)ts->l_uf, days[tm->tm_wday],
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months[tm->tm_mon], tm->tm_mday, 1900 + tm->tm_year,
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tm->tm_hour,tm->tm_min, tm->tm_sec, msec);
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}
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return bp;
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}
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char *
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gmprettydate(
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l_fp *ts
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)
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{
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char *bp;
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struct tm *tm;
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time_t sec;
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u_long msec;
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LIB_GETBUF(bp);
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sec = ts->l_ui;
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msec = ts->l_uf / 4294967; /* fract / (2 ** 32 / 1000) */
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tm = ntp2unix_tm(sec, 0);
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if (!tm) {
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(void) sprintf(bp, "%08lx.%08lx --- --- -- ---- --:--:--",
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(u_long)ts->l_ui, (u_long)ts->l_uf);
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}
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else {
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(void) sprintf(bp, "%08lx.%08lx %s, %s %2d %4d %2d:%02d:%02d.%03lu",
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(u_long)ts->l_ui, (u_long)ts->l_uf, days[tm->tm_wday],
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months[tm->tm_mon], tm->tm_mday, 1900 + tm->tm_year,
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tm->tm_hour,tm->tm_min, tm->tm_sec, msec);
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}
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return bp;
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}
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