From cd58af7f7c6b6da08c4f34e25882752db3e71d48 Mon Sep 17 00:00:00 2001
From: orange <mike@sprachgewalt.de>
Date: Sun, 9 Jun 2013 20:56:25 +0200
Subject: [PATCH] add bit fuckery

---
 Makefile       |  5 ++++-
 bit-fuckery.c  | 33 +++++++++++++++++++++++++++++++++
 bit-fuckery2.c | 37 +++++++++++++++++++++++++++++++++++++
 3 files changed, 74 insertions(+), 1 deletion(-)
 create mode 100644 bit-fuckery.c
 create mode 100644 bit-fuckery2.c

diff --git a/Makefile b/Makefile
index f62d539..24297e5 100644
--- a/Makefile
+++ b/Makefile
@@ -1,7 +1,7 @@
 CFLAGS=-std=c99 -Wall -g -O2
 INDENTOPTS=-kr --no-tabs --braces-on-func-def-line --indent-level2
 
-TARGETS=approximate-pi linked-list mandelbrot mandelbrot.bmp threads circular-buffer structs
+TARGETS=approximate-pi linked-list mandelbrot mandelbrot.bmp threads circular-buffer structs ncurses-pong bit-fuckery bit-fuckery2
 
 .PHONY: all
 all: $(TARGETS)
@@ -22,3 +22,6 @@ mandelbrot.bmp: mandelbrot
 
 threads: threads.c
 	$(CC) $(CFLAGS) -o $@ $< -pthread
+
+ncurses-pong: ncurses-pong.c
+	$(CC) $(CFLAGS) -o $@ $< -lncurses
diff --git a/bit-fuckery.c b/bit-fuckery.c
new file mode 100644
index 0000000..06ea2e9
--- /dev/null
+++ b/bit-fuckery.c
@@ -0,0 +1,33 @@
+#include <assert.h>
+
+int main() {
+  int foo;
+
+  foo = 42;
+
+  /* Delete bit 5 */
+  foo &= ~(1 << 5);
+  assert(foo == 10);
+  foo &= ~(1 << 5);
+  assert(foo == 10);
+
+  /* Set bit 5 again */
+  foo |= (1 << 5);
+  assert(foo == 42);
+  foo |= (1 << 5);
+  assert(foo == 42);
+
+  /* Set bit 0 */
+  foo |= (1 << 0);
+  assert(foo == 43);
+
+  /* Delete bit 0 */
+  foo &= ~(1 << 0);
+  assert(foo == 42);
+
+  /* Toggle bit 5 */
+  foo ^= (1 << 5);
+  assert(foo == 10);
+  foo ^= (1 << 5);
+  assert(foo == 42);
+}
diff --git a/bit-fuckery2.c b/bit-fuckery2.c
new file mode 100644
index 0000000..855019b
--- /dev/null
+++ b/bit-fuckery2.c
@@ -0,0 +1,37 @@
+#include <assert.h>
+
+#define BIT_DEL(x, n)    ((x) &= ~(1<<(n)))
+#define BIT_SET(x, n)    ((x) |=  (1<<(n)))
+#define BIT_TOGGLE(x, n) ((x) ^=  (1<<(n)))
+
+int main() {
+  int foo;
+
+  foo = 42;
+
+  /* Delete bit 5 */
+  BIT_DEL(foo, 5);
+  assert(foo == 10);
+  BIT_DEL(foo, 5);
+  assert(foo == 10);
+
+  /* Set bit 5 again */
+  BIT_SET(foo, 5);
+  assert(foo == 42);
+  BIT_SET(foo, 5);
+  assert(foo == 42);
+
+  /* Set bit 0 */
+  BIT_SET(foo, 0);
+  assert(foo == 43);
+
+  /* Delete bit 0 */
+  BIT_DEL(foo, 0);
+  assert(foo == 42);
+
+  /* Toggle bit 5 */
+  BIT_TOGGLE(foo, 5);
+  assert(foo == 10);
+  BIT_TOGGLE(foo, 5);
+  assert(foo == 42);
+}