Add effects

1 files changed, 42 insertions, 5 deletions

diff --git a/src/util.c b/src/util.c
index 805d397..301222a 100644
--- a/src/util.c
+++ b/src/util.c
@@ -28,14 +28,46 @@ void color_print(FILE *stream, color_t *color)
     fprintf(stream, "#%02x%02x%02x%02x", r, g, b, a);
 }
 
+struct timespec timespec_from_ms(long ms)
+{
+    struct timespec ts = {
+        .tv_sec = ms / 1000,
+        .tv_nsec = (ms % 1000) * 1000000ul,
+    };
+    return ts;
+}
+
+long timespec_to_ms(struct timespec ts)
+{
+    return (ts.tv_sec * 1000) + (ts.tv_nsec / 1000000ul);
+}
+
 struct timespec timespec_diff(struct timespec a, struct timespec b)
 {
-    bool over = (b.tv_nsec - a.tv_nsec) < 0;
-    struct timespec diff = {
-        .tv_sec = b.tv_sec - a.tv_sec - over,
-        .tv_nsec = b.tv_nsec - a.tv_nsec + over * 1000000000ul,
+    bool over = (a.tv_nsec - b.tv_nsec) < 0;
+    struct timespec ts = {
+        .tv_sec = a.tv_sec - b.tv_sec - over,
+        .tv_nsec = a.tv_nsec - b.tv_nsec + over * 1000000000ul,
     };
-    return diff;
+    return ts;
+}
+
+struct timespec timespec_add(struct timespec a, struct timespec b)
+{
+    bool over = (a.tv_nsec + b.tv_nsec) > 1000000000ul;
+    struct timespec ts = {
+        .tv_sec = a.tv_sec + b.tv_sec + over,
+        .tv_nsec = a.tv_nsec + b.tv_nsec - over * 1000000000ul,
+    };
+    return ts;
+}
+
+struct timespec timespec_div(struct timespec ts, int n)
+{
+    ts.tv_nsec /= n;
+    ts.tv_nsec += ((ts.tv_sec % n) * 1000000000ul) / n;
+    ts.tv_sec /= n;
+    return ts;
 }
 
 bool timespec_greater(struct timespec a, struct timespec b)
@@ -44,6 +76,11 @@ bool timespec_greater(struct timespec a, struct timespec b)
         || (a.tv_sec == b.tv_sec && a.tv_nsec > b.tv_nsec);
 }
 
+bool timespec_zero(struct timespec ts)
+{
+    return ts.tv_sec == 0 && ts.tv_nsec == 0;
+}
+
 void timespec_print(FILE *stream, struct timespec *ts)
 {
     fprintf(stream, "%ld.%.9ld", ts->tv_sec, ts->tv_nsec);