Merge branch 'master' of https://github.com/EliteTK/c-stuff

1 files changed, 60 insertions, 0 deletions

diff --git a/time_diff.c b/time_diff.c
new file mode 100644
index 0000000..726a6cd
--- /dev/null
+++ b/time_diff.c
@@ -0,0 +1,60 @@
+#include <errno.h>
+#include <stdbool.h>
+#include <stdint.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <time.h>
+
+const char *progname;
+
+inline uint64_t get_time_ms(void)
+{
+	struct timespec timespec;
+	static const uint64_t invmil = 1 / 1000000;
+
+	if (clock_gettime(CLOCK_MONOTONIC, &timespec) != 0) {
+		fprintf(stderr, "%s: Unable to get time delta: %s\n",
+				progname, strerror(errno));
+		exit(EXIT_FAILURE);
+	}
+
+	return timespec.tv_sec * 1000 + timespec.tv_nsec * invmil;
+}
+
+uint64_t get_delta(void)
+{
+	static uint64_t oldtime = 0;
+	uint64_t timediff, newtime;
+
+	newtime = get_time_ms();
+
+	timediff = newtime - oldtime;
+
+	oldtime = newtime;
+
+	return timediff;
+}
+
+int main(int argc, char **argv)
+{
+	struct {
+		int a;
+		char b;
+	} teststruct = {1, 2};
+
+	uint64_t buildup = 0, count = 0;
+
+	progname = argc != 0 && argv[0] != NULL ? argv[0] : "";
+
+	get_delta();
+
+	while (true) {
+		for (buildup += get_delta(); buildup >= 1000; buildup -= 1000)
+			printf("%lu, %lu\n", count++, buildup);
+	}
+
+	printf("%d\n", teststruct.a);
+
+	return 0;
+}