1 files changed, 56 insertions, 0 deletions
diff --git a/source/time.c b/source/time.c
new file mode 100644
index 0000000..e2c47b0
--- /dev/null
+++ b/source/time.c
@@ -0,0 +1,56 @@
+#include "time.h"
+
+struct timespec timespec_add(struct timespec a, struct timespec b) {
+    a.tv_sec += b.tv_sec;
+    a.tv_nsec += b.tv_nsec;
+    if (a.tv_nsec >= 1000000000) {
+        a.tv_sec++;
+        a.tv_nsec -= 1000000000;
+    }
+    return a;
+}
+
+struct timespec timespec_sub(struct timespec a, struct timespec b) {
+    a.tv_sec -= b.tv_sec;
+    a.tv_nsec -= b.tv_nsec;
+    if (a.tv_nsec < 0) {
+        a.tv_sec--;
+        a.tv_nsec += 1000000000;
+    }
+    return a;
+}
+
+int timespec_cmp(struct timespec a, struct timespec b) {
+  return a.tv_sec > b.tv_sec ?
+    (1) :
+    a.tv_sec < b.tv_sec ?
+    (-1) :
+    (
+      a.tv_nsec > b.tv_nsec ?
+      (1) :
+      a.tv_nsec < b.tv_nsec ?
+      (-1) : 0
+    );
+}
+
+struct timespec timespec_max(struct timespec a, struct timespec b) {
+  return a.tv_sec > b.tv_sec ?
+    a :
+    a.tv_sec < b.tv_sec ?
+    b :
+    (
+      a.tv_nsec > b.tv_nsec ?
+      a : b
+    );
+}
+
+struct timespec timespec_min(struct timespec a, struct timespec b) {
+  return a.tv_sec < b.tv_sec ?
+    a :
+    a.tv_sec > b.tv_sec ?
+    b :
+    (
+      a.tv_nsec < b.tv_nsec ?
+      a : b
+    );
+}