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-rw-r--r--time.c65
1 files changed, 65 insertions, 0 deletions
diff --git a/time.c b/time.c
new file mode 100644
index 0000000..fb007ba
--- /dev/null
+++ b/time.c
@@ -0,0 +1,65 @@
+#include <time.h>
+#include <errno.h>
+#include <sys/stat.h>
+
+static struct timespec time_last_modified(char const *filename) {
+#if __unix__
+ struct stat statbuf = {};
+ stat(filename, &statbuf);
+ return statbuf.st_mtim;
+#else
+ // windows' _stat does not have st_mtim
+ struct _stat statbuf = {};
+ struct timespec ts = {};
+ _stat(filename, &statbuf);
+ ts.tv_sec = statbuf.st_mtime;
+ return ts;
+#endif
+}
+
+static int timespec_cmp(struct timespec a, struct timespec b) {
+ if (a.tv_sec > b.tv_sec) return 1;
+ if (a.tv_sec < b.tv_sec) return -1;
+ if (a.tv_nsec > b.tv_nsec) return 1;
+ if (a.tv_nsec < b.tv_nsec) return -1;
+ return 0;
+}
+
+static bool timespec_eq(struct timespec a, struct timespec b) {
+ return timespec_cmp(a, b) == 0;
+}
+
+static struct timespec timespec_max(struct timespec a, struct timespec b) {
+ return timespec_cmp(a, b) < 0 ? b : a;
+}
+
+// sleep for a certain number of nanoseconds
+static void sleep_ns(u64 ns) {
+#if __unix__
+ struct timespec rem = {}, req = {
+ (time_t)(ns / 1000000000),
+ (long)(ns % 1000000000)
+ };
+
+ while (nanosleep(&req, &rem) == EINTR) // sleep interrupted by signal
+ req = rem;
+#else
+ // windows....
+ Sleep((DWORD)(ns / 1000000));
+#endif
+}
+
+// sleep for microseconds
+static void time_sleep_us(u64 us) {
+ sleep_ns(us * 1000);
+}
+
+// sleep for milliseconds
+static void time_sleep_ms(u64 ms) {
+ sleep_ns(ms * 1000000);
+}
+
+// sleep for seconds
+static void time_sleep_s(u64 s) {
+ sleep_ns(s * 1000000000);
+}