From 04576dc2a3f761eb041b808b56f13a58052e7655 Mon Sep 17 00:00:00 2001
From: Stefan Zabka <zabkaste@hu-berlin.de>
Date: Sun, 24 May 2020 12:19:52 +0200
Subject: Moved back to 02_exercise

---
 02_exercise/prog.c | 52 ++++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 52 insertions(+)
 create mode 100644 02_exercise/prog.c

(limited to '02_exercise/prog.c')

diff --git a/02_exercise/prog.c b/02_exercise/prog.c
new file mode 100644
index 0000000..efd2527
--- /dev/null
+++ b/02_exercise/prog.c
@@ -0,0 +1,52 @@
+#include <time.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <unistd.h>
+
+static unsigned int hash(const void* key, size_t size) {
+	const char* ptr = key;
+	unsigned int hval;
+	
+	for (hval = 0x811c9dc5u; size --> 0; ++ptr) {
+		hval ^= *ptr;
+		hval *= 0x1000193u;
+	}
+	
+	return hval;
+}
+
+static inline int roll(int sides) {
+	return rand() / (RAND_MAX + 1.0) * sides;
+}
+
+int main(int argc, const char* argv[]) {
+	int rc, delay;
+	time_t now = time(0);
+	
+	/* initialize the random number generator */
+	srand(hash(&now, sizeof(now)));
+	
+	/* determine exit code and time delay */
+	switch (argc) {
+	default:
+		delay = atoi(argv[1]);
+		rc = atoi(argv[2]);
+		break;
+		
+	case 2:
+		delay = atoi(argv[1]);
+		rc = roll(2) - 1;
+		break;
+		
+	case 1:
+		delay = roll(10);
+		rc = roll(2) - 1;
+		break;
+	}
+	
+	printf("Delay: %ds, Exit Code: %d\n", delay, rc);
+	fflush(stdout);
+	sleep(delay);
+	
+	return rc;
+}
-- 
cgit v1.2.3-54-g00ecf