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core: add functions to core/time.c

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To support the new filter code, add helper functions that turn timestamps
into year and day-of-week to core/time.c.

Internally, these functions simply call utc_mktime() to break down the
timestamp and then extract the wanted value. This may appear inefficient,
but testing shows that modern compilers are quite effective in throwing
away the unneeded calculations. FWIW in this respect clang10 outperformed
gcc10.

Signed-off-by: Berthold Stoeger <bstoeger@mail.tuwien.ac.at>
This commit is contained in:
Berthold Stoeger 2020-05-23 11:59:53 +02:00 • committed by Dirk Hohndel
parent efdc875aa3
commit 0f4154bacc
2 changed files with 32 additions and 0 deletions
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core/subsurface-time.h
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@ -11,6 +11,8 @@ extern "C" {
extern timestamp_t utc_mktime(struct tm *tm);
extern void utc_mkdate(timestamp_t, struct tm *tm);
extern int utc_year(timestamp_t timestamp);
extern int utc_weekday(timestamp_t timestamp);
#ifdef __cplusplus
}