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add minmea_getdate()

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The GPS date is internally converted to a struct tm anyway.
Add a function to make use of this for external users too.
This commit is contained in:
Benjamin Valentin 2019-05-16 14:59:07 +02:00
parent ae4dd9442a
commit 4ebbaef840
2 changed files with 24 additions and 11 deletions
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30
minmea.c
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@ -612,25 +612,33 @@ bool minmea_parse_zda(struct minmea_sentence_zda *frame, const char *sentence)
return true;
}
int minmea_gettime(struct timespec *ts, const struct minmea_date *date, const struct minmea_time *time_)
int minmea_getdate(struct tm *out, const struct minmea_date *date, const struct minmea_time *time_)
{
if (date->year == -1 || time_->hours == -1)
return -1;
struct tm tm;
memset(&tm, 0, sizeof(tm));
memset(out, 0, sizeof(struct tm));
if (date->year < 80) {
tm.tm_year = 2000 + date->year - 1900; // 2000-2079
out->tm_year = 2000 + date->year - 1900; // 2000-2079
} else if (date->year >= 1900) {
tm.tm_year = date->year - 1900; // 4 digit year, use directly
out->tm_year = date->year - 1900; // 4 digit year, use directly
} else {
tm.tm_year = date->year; // 1980-1999
out->tm_year = date->year; // 1980-1999
}
tm.tm_mon = date->month - 1;
tm.tm_mday = date->day;
tm.tm_hour = time_->hours;
tm.tm_min = time_->minutes;
tm.tm_sec = time_->seconds;
out->tm_mon = date->month - 1;
out->tm_mday = date->day;
out->tm_hour = time_->hours;
out->tm_min = time_->minutes;
out->tm_sec = time_->seconds;
return 0;
}
int minmea_gettime(struct timespec *ts, const struct minmea_date *date, const struct minmea_time *time_)
{
struct tm tm;
if (minmea_getdate(&tm, date, time_))
return -1;
time_t timestamp = timegm(&tm); /* See README.md if your system lacks timegm(). */
if (timestamp != (time_t)-1) {

5
minmea.h
View File

@ -208,6 +208,11 @@ bool minmea_parse_gsv(struct minmea_sentence_gsv *frame, const char *sentence);
bool minmea_parse_vtg(struct minmea_sentence_vtg *frame, const char *sentence);
bool minmea_parse_zda(struct minmea_sentence_zda *frame, const char *sentence);
/**
* Convert GPS UTC date/time representation to a UNIX calendar time.
*/
int minmea_getdate(struct tm *out, const struct minmea_date *date, const struct minmea_time *time_);
/**
* Convert GPS UTC date/time representation to a UNIX timestamp.
*/