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| author |  Berthold Stoeger <bstoeger@mail.tuwien.ac.at> | 2020-05-23 11:59:53 +0200 |
|---|---|---|
| committer |  Dirk Hohndel <dirk@hohndel.org> | 2020-09-29 16:13:03 -0700 |
| commit | 0f4154bacccd0884ffbd5ae5bfa1fa16991675dc (patch) | |
| tree | 2fd756947d9cba9a7c59d552b95933ddb54f2d06 /core/subsurface-time.h | |
| parent | efdc875aa3174ba53a819490e498a59ba0399dc6 (diff) | |
| download | subsurface-0f4154bacccd0884ffbd5ae5bfa1fa16991675dc.tar.gz | |
core: add functions to core/time.c
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>
Diffstat (limited to 'core/subsurface-time.h')
| -rw-r--r-- | core/subsurface-time.h | 2 |
1 files changed, 2 insertions, 0 deletions
diff --git a/core/subsurface-time.h b/core/subsurface-time.h index 38d6c10de..ce2821d07 100644 --- a/core/subsurface-time.h +++ b/core/subsurface-time.h @@ -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 } |