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author | Eric S. Raymond <esr@thyrsus.com> | 2011-02-02 02:54:52 -0500 |
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committer | Eric S. Raymond <esr@thyrsus.com> | 2011-02-02 02:54:52 -0500 |
commit | 0354c635eb8286dc4a6af15f0a07c39105483ec4 (patch) | |
tree | c324536226cb86b195e186172bef694a9134b46b /pseudonmea.c | |
parent | 7882f91ad748863a4371be8ad9a8d1a3a3e4729e (diff) | |
download | gpsd-0354c635eb8286dc4a6af15f0a07c39105483ec4.tar.gz |
Explain why we emit ZDA in pseudo-nmea without timezone.
Diffstat (limited to 'pseudonmea.c')
-rw-r--r-- | pseudonmea.c | 9 |
1 files changed, 9 insertions, 0 deletions
diff --git a/pseudonmea.c b/pseudonmea.c index efac75cc..a6b343ac 100644 --- a/pseudonmea.c +++ b/pseudonmea.c @@ -231,6 +231,15 @@ static void gpsd_binary_time_dump(struct gps_device_t *session, fractional = modf(session->newdata.time, &integral); integral_time = (time_t) integral; (void)gmtime_r(&integral_time, &tm); + /* + * We pin this report to the GMT/UTC timezone. This may be technically + * incorrect; our sources on ZDA suggest that it should report local + * timezone. But no GPS we've ever seen actually does this, because it + * would require embedding a location-to-TZ database in the receiver. + * And even if we could do that, it would make our regression tests + * break any time they were run in a timezone different from the one + * where they were generated. + */ (void)snprintf(bufp, len, "$GPZDA,%02d%02d%05.2f,%02d,%02d,%04d,00,00", tm.tm_hour, |