From 7b8c5e3212bd740d3ef9dc29c64796d5dc3f6036 Mon Sep 17 00:00:00 2001
From: Dan Buch <daniel.buch@gmail.com>
Date: Sun, 12 Jun 2011 22:36:31 -0400
Subject: [PATCH 01/25] doing some puzzles!

---
 .gitignore             |  1 +
 gowrikumar/00-sizeof.c | 21 +++++++++++++++++++++
 gowrikumar/Makefile    |  3 +++
 3 files changed, 25 insertions(+)
 create mode 100644 .gitignore
 create mode 100644 gowrikumar/00-sizeof.c
 create mode 100644 gowrikumar/Makefile

diff --git a/.gitignore b/.gitignore
new file mode 100644
index 0000000..874b249
--- /dev/null
+++ b/.gitignore
@@ -0,0 +1 @@
+gowrikumar/*
diff --git a/gowrikumar/00-sizeof.c b/gowrikumar/00-sizeof.c
new file mode 100644
index 0000000..9156974
--- /dev/null
+++ b/gowrikumar/00-sizeof.c
@@ -0,0 +1,21 @@
+/**
+ * :author: Dan Buch (daniel.buch@gmail.com)
+ */
+
+#include <stdio.h>
+
+#define TOTAL_ELEMENTS (sizeof(array) / sizeof(array[0]))
+int array[] = {23,34,12,17,204,99,16};
+
+int main()
+{
+    int d;
+
+    for(d=-1;d <= (TOTAL_ELEMENTS-2);d++)
+        printf("%d\n",array[d+1]);
+
+    return 0;
+}
+
+/* vim:filetype=c:fileencoding=utf-8
+ */
diff --git a/gowrikumar/Makefile b/gowrikumar/Makefile
new file mode 100644
index 0000000..3670e45
--- /dev/null
+++ b/gowrikumar/Makefile
@@ -0,0 +1,3 @@
+all: 00-sizeof
+
+00-sizeof: 00-sizeof.o

From 81f7260e3fa6f88f50b19cc8faa645f998e05334 Mon Sep 17 00:00:00 2001
From: Dan Buch <daniel.buch@gmail.com>
Date: Sun, 12 Jun 2011 22:37:29 -0400
Subject: [PATCH 02/25] adding url because I forget stuff and don't know how to
 use bookmarks

---
 gowrikumar/Makefile | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/gowrikumar/Makefile b/gowrikumar/Makefile
index 3670e45..76fbc35 100644
--- a/gowrikumar/Makefile
+++ b/gowrikumar/Makefile
@@ -1,3 +1,6 @@
+# puzzles from http://www.gowrikumar.com/c/
+
+
 all: 00-sizeof
 
 00-sizeof: 00-sizeof.o

From 7f11279bfde5e2bc75eb7b05f265490f4310692e Mon Sep 17 00:00:00 2001
From: Dan Buch <daniel.buch@gmail.com>
Date: Sun, 12 Jun 2011 23:02:18 -0400
Subject: [PATCH 03/25] ummmm, fixed?

---
 Makefile               |  9 +++++++++
 gowrikumar/00-sizeof.c | 18 ++++++++++--------
 gowrikumar/Makefile    |  4 ++++
 3 files changed, 23 insertions(+), 8 deletions(-)
 create mode 100644 Makefile

diff --git a/Makefile b/Makefile
new file mode 100644
index 0000000..ef38af9
--- /dev/null
+++ b/Makefile
@@ -0,0 +1,9 @@
+DEBUG :=
+export DEBUG
+
+
+all:
+	cd gowrikumar && $(MAKE)
+
+
+.PHONY: all
diff --git a/gowrikumar/00-sizeof.c b/gowrikumar/00-sizeof.c
index 9156974..8981bfe 100644
--- a/gowrikumar/00-sizeof.c
+++ b/gowrikumar/00-sizeof.c
@@ -1,18 +1,20 @@
-/**
- * :author: Dan Buch (daniel.buch@gmail.com)
- */
-
 #include <stdio.h>
 
-#define TOTAL_ELEMENTS (sizeof(array) / sizeof(array[0]))
-int array[] = {23,34,12,17,204,99,16};
+
+int array[] = {23, 34, 12, 17, 204, 99, 16};
+#define TOTAL_ELEMENTS sizeof(array) / sizeof(array[0])
+
 
 int main()
 {
     int d;
 
-    for(d=-1;d <= (TOTAL_ELEMENTS-2);d++)
-        printf("%d\n",array[d+1]);
+#ifdef DEBUG
+    printf("sizeof(array) = %d\n", TOTAL_ELEMENTS);
+#endif
+
+    for (d = 0; d < TOTAL_ELEMENTS ; d++)
+        printf("%d\n", array[d]);
 
     return 0;
 }
diff --git a/gowrikumar/Makefile b/gowrikumar/Makefile
index 76fbc35..a90a693 100644
--- a/gowrikumar/Makefile
+++ b/gowrikumar/Makefile
@@ -3,4 +3,8 @@
 
 all: 00-sizeof
 
+
 00-sizeof: 00-sizeof.o
+
+
+.PHONY: all

From 7532ba866a753e6ffbc505aecae69d927d5a6bff Mon Sep 17 00:00:00 2001
From: Dan Buch <daniel.buch@gmail.com>
Date: Sun, 12 Jun 2011 23:51:17 -0400
Subject: [PATCH 04/25] not much to show for this one, but I'm pretty sure I
 get it :-P

---
 .gitignore              |  3 ++-
 gowrikumar/02-dowhile.c | 20 ++++++++++++++++++++
 gowrikumar/Makefile     |  4 +++-
 3 files changed, 25 insertions(+), 2 deletions(-)
 create mode 100644 gowrikumar/02-dowhile.c

diff --git a/.gitignore b/.gitignore
index 874b249..841658b 100644
--- a/.gitignore
+++ b/.gitignore
@@ -1 +1,2 @@
-gowrikumar/*
+gowrikumar/00-sizeof
+gowrikumar/02-dowhile
diff --git a/gowrikumar/02-dowhile.c b/gowrikumar/02-dowhile.c
new file mode 100644
index 0000000..eba0649
--- /dev/null
+++ b/gowrikumar/02-dowhile.c
@@ -0,0 +1,20 @@
+/**
+ * :author: Dan Buch (daniel.buch@gmail.com)
+ */
+
+#include <stdio.h>
+
+int main()
+{
+    int i = 1;
+    do
+    {
+        printf("%d\n", i);
+    } while(++i < 15);
+    return 0;
+}
+
+
+
+/* vim:filetype=c:fileencoding=utf-8
+ */
diff --git a/gowrikumar/Makefile b/gowrikumar/Makefile
index a90a693..ebef3f9 100644
--- a/gowrikumar/Makefile
+++ b/gowrikumar/Makefile
@@ -1,10 +1,12 @@
 # puzzles from http://www.gowrikumar.com/c/
 
 
-all: 00-sizeof
+all: 00-sizeof 02-dowhile
 
 
 00-sizeof: 00-sizeof.o
 
+00-dowhile: 00-dowhile.o
+
 
 .PHONY: all

From fc20882f74a52d9d8ff1fd4f28b67a9d3074489d Mon Sep 17 00:00:00 2001
From: Dan Buch <daniel.buch@gmail.com>
Date: Mon, 13 Jun 2011 22:22:12 -0400
Subject: [PATCH 05/25] simplifying the Makefile a touch

---
 gowrikumar/Makefile | 7 +------
 1 file changed, 1 insertion(+), 6 deletions(-)

diff --git a/gowrikumar/Makefile b/gowrikumar/Makefile
index ebef3f9..6290501 100644
--- a/gowrikumar/Makefile
+++ b/gowrikumar/Makefile
@@ -1,12 +1,7 @@
 # puzzles from http://www.gowrikumar.com/c/
 
 
-all: 00-sizeof 02-dowhile
-
-
-00-sizeof: 00-sizeof.o
-
-00-dowhile: 00-dowhile.o
+all: $(patsubst %.c,%,$(wildcard *.c))
 
 
 .PHONY: all

From 90e101db98c948b9ff905351ac499843a8c7a5c3 Mon Sep 17 00:00:00 2001
From: Dan Buch <daniel.buch@gmail.com>
Date: Thu, 16 Jun 2011 21:29:28 -0400
Subject: [PATCH 06/25] exercise 3

---
 .gitignore                |  1 +
 gowrikumar/03-stdoutbuf.c | 22 ++++++++++++++++++++++
 2 files changed, 23 insertions(+)
 create mode 100644 gowrikumar/03-stdoutbuf.c

diff --git a/.gitignore b/.gitignore
index 841658b..ba46549 100644
--- a/.gitignore
+++ b/.gitignore
@@ -1,2 +1,3 @@
 gowrikumar/00-sizeof
 gowrikumar/02-dowhile
+gowrikumar/03-stdoutbuf
diff --git a/gowrikumar/03-stdoutbuf.c b/gowrikumar/03-stdoutbuf.c
new file mode 100644
index 0000000..4cf1fb1
--- /dev/null
+++ b/gowrikumar/03-stdoutbuf.c
@@ -0,0 +1,22 @@
+/**
+ * :author: Dan Buch (daniel.buch@gmail.com)
+ */
+
+#include <stdio.h>
+#include <unistd.h>
+
+int main()
+{
+    printf("(Hit ^C to stop the madness.)\n");
+    while(1)
+    {
+        fprintf(stdout, "hello-out ");
+        fprintf(stderr, "hello-err ");
+        sleep(1);
+    }
+    return 0;
+}
+
+
+/* vim:filetype=c:fileencoding=utf-8
+ */

From e026dabefbff3b213781e475e22f7aba761c334d Mon Sep 17 00:00:00 2001
From: Dan Buch <daniel.buch@gmail.com>
Date: Thu, 16 Jun 2011 21:33:57 -0400
Subject: [PATCH 07/25] futzing with stdout flushing solutions

---
 .gitignore                 |  2 ++
 gowrikumar/03b-stdoutbuf.c | 23 +++++++++++++++++++++++
 gowrikumar/03c-stdoutbuf.c | 24 ++++++++++++++++++++++++
 3 files changed, 49 insertions(+)
 create mode 100644 gowrikumar/03b-stdoutbuf.c
 create mode 100644 gowrikumar/03c-stdoutbuf.c

diff --git a/.gitignore b/.gitignore
index ba46549..740fcd7 100644
--- a/.gitignore
+++ b/.gitignore
@@ -1,3 +1,5 @@
 gowrikumar/00-sizeof
 gowrikumar/02-dowhile
 gowrikumar/03-stdoutbuf
+gowrikumar/03b-stdoutbuf
+gowrikumar/03c-stdoutbuf
diff --git a/gowrikumar/03b-stdoutbuf.c b/gowrikumar/03b-stdoutbuf.c
new file mode 100644
index 0000000..deb9800
--- /dev/null
+++ b/gowrikumar/03b-stdoutbuf.c
@@ -0,0 +1,23 @@
+/**
+ * :author: Dan Buch (daniel.buch@gmail.com)
+ */
+
+#include <stdio.h>
+#include <unistd.h>
+
+int main()
+{
+    printf("This time we'll include \\n!\n");
+    printf("(Hit ^C to stop the madness.)\n");
+    while(1)
+    {
+        fprintf(stdout, "hello-out\n");
+        fprintf(stderr, "hello-err\n");
+        sleep(1);
+    }
+    return 0;
+}
+
+
+/* vim:filetype=c:fileencoding=utf-8
+ */
diff --git a/gowrikumar/03c-stdoutbuf.c b/gowrikumar/03c-stdoutbuf.c
new file mode 100644
index 0000000..0402ec2
--- /dev/null
+++ b/gowrikumar/03c-stdoutbuf.c
@@ -0,0 +1,24 @@
+/**
+ * :author: Dan Buch (daniel.buch@gmail.com)
+ */
+
+#include <stdio.h>
+#include <unistd.h>
+
+int main()
+{
+    printf("This time we'll flush stdout!\n");
+    printf("(Hit ^C to stop the madness.)\n");
+    while(1)
+    {
+        fprintf(stdout, "hello-out ");
+        fprintf(stderr, "hello-err ");
+        fflush(stdout);
+        sleep(1);
+    }
+    return 0;
+}
+
+
+/* vim:filetype=c:fileencoding=utf-8
+ */

From 731e1002cd71b2dd48a95c8ecaf610d7336cb3f2 Mon Sep 17 00:00:00 2001
From: Dan Buch <daniel.buch@gmail.com>
Date: Thu, 16 Jun 2011 21:46:56 -0400
Subject: [PATCH 08/25] cleaning things up a bit

---
 .gitignore                           |  6 +-----
 gowrikumar/Makefile                  |  7 +++++--
 gowrikumar/bin/.keep                 |  0
 gowrikumar/{ => src}/00-sizeof.c     |  0
 gowrikumar/{ => src}/02-dowhile.c    |  0
 gowrikumar/{ => src}/03-stdoutbuf.c  |  0
 gowrikumar/{ => src}/03b-stdoutbuf.c |  0
 gowrikumar/{ => src}/03c-stdoutbuf.c |  0
 gowrikumar/src/04-macrodef.c         | 19 +++++++++++++++++++
 gowrikumar/src/Makefile              | 14 ++++++++++++++
 10 files changed, 39 insertions(+), 7 deletions(-)
 create mode 100644 gowrikumar/bin/.keep
 rename gowrikumar/{ => src}/00-sizeof.c (100%)
 rename gowrikumar/{ => src}/02-dowhile.c (100%)
 rename gowrikumar/{ => src}/03-stdoutbuf.c (100%)
 rename gowrikumar/{ => src}/03b-stdoutbuf.c (100%)
 rename gowrikumar/{ => src}/03c-stdoutbuf.c (100%)
 create mode 100644 gowrikumar/src/04-macrodef.c
 create mode 100644 gowrikumar/src/Makefile

diff --git a/.gitignore b/.gitignore
index 740fcd7..d800b0d 100644
--- a/.gitignore
+++ b/.gitignore
@@ -1,5 +1 @@
-gowrikumar/00-sizeof
-gowrikumar/02-dowhile
-gowrikumar/03-stdoutbuf
-gowrikumar/03b-stdoutbuf
-gowrikumar/03c-stdoutbuf
+gowrikumar/bin
diff --git a/gowrikumar/Makefile b/gowrikumar/Makefile
index 6290501..ef886fd 100644
--- a/gowrikumar/Makefile
+++ b/gowrikumar/Makefile
@@ -1,7 +1,10 @@
-# puzzles from http://www.gowrikumar.com/c/
+BINDIR := ./bin
+
+export BINDIR
 
 
-all: $(patsubst %.c,%,$(wildcard *.c))
+all:
+	cd src && $(MAKE)
 
 
 .PHONY: all
diff --git a/gowrikumar/bin/.keep b/gowrikumar/bin/.keep
new file mode 100644
index 0000000..e69de29
diff --git a/gowrikumar/00-sizeof.c b/gowrikumar/src/00-sizeof.c
similarity index 100%
rename from gowrikumar/00-sizeof.c
rename to gowrikumar/src/00-sizeof.c
diff --git a/gowrikumar/02-dowhile.c b/gowrikumar/src/02-dowhile.c
similarity index 100%
rename from gowrikumar/02-dowhile.c
rename to gowrikumar/src/02-dowhile.c
diff --git a/gowrikumar/03-stdoutbuf.c b/gowrikumar/src/03-stdoutbuf.c
similarity index 100%
rename from gowrikumar/03-stdoutbuf.c
rename to gowrikumar/src/03-stdoutbuf.c
diff --git a/gowrikumar/03b-stdoutbuf.c b/gowrikumar/src/03b-stdoutbuf.c
similarity index 100%
rename from gowrikumar/03b-stdoutbuf.c
rename to gowrikumar/src/03b-stdoutbuf.c
diff --git a/gowrikumar/03c-stdoutbuf.c b/gowrikumar/src/03c-stdoutbuf.c
similarity index 100%
rename from gowrikumar/03c-stdoutbuf.c
rename to gowrikumar/src/03c-stdoutbuf.c
diff --git a/gowrikumar/src/04-macrodef.c b/gowrikumar/src/04-macrodef.c
new file mode 100644
index 0000000..30b641f
--- /dev/null
+++ b/gowrikumar/src/04-macrodef.c
@@ -0,0 +1,19 @@
+/**
+ * :author: Dan Buch (daniel.buch@gmail.com)
+ */
+
+#include <stdio.h>
+
+#define f(a, b) a##b
+#define g(a) #a
+#define h(a) g(a)
+
+int main()
+{
+    printf("%s\n", h(f(1, 2)));
+    printf("%s\n", g(f(1, 2)));
+    return 0;
+}
+
+/* vim:filetype=c:fileencoding=utf-8
+ */
diff --git a/gowrikumar/src/Makefile b/gowrikumar/src/Makefile
new file mode 100644
index 0000000..b8b21ff
--- /dev/null
+++ b/gowrikumar/src/Makefile
@@ -0,0 +1,14 @@
+# puzzles from http://www.gowrikumar.com/c/
+
+BINDIR := ../bin
+
+ALL_BIN := $(patsubst %.c,$(BINDIR)/%,$(wildcard *.c))
+
+
+$(BINDIR)/%: %.c
+	$(CC) -o $@ $<
+
+all: $(ALL_BIN)
+
+
+.PHONY: all

From 4a783c9a7ae2de2de4be1491159c541ed7dfe354 Mon Sep 17 00:00:00 2001
From: Dan Buch <daniel.buch@gmail.com>
Date: Thu, 16 Jun 2011 21:48:15 -0400
Subject: [PATCH 09/25] in case I feel like cleaning

---
 Makefile            | 5 ++++-
 gowrikumar/Makefile | 5 ++++-
 2 files changed, 8 insertions(+), 2 deletions(-)

diff --git a/Makefile b/Makefile
index ef38af9..de20a16 100644
--- a/Makefile
+++ b/Makefile
@@ -5,5 +5,8 @@ export DEBUG
 all:
 	cd gowrikumar && $(MAKE)
 
+clean:
+	cd gowrikumar && $(MAKE) clean
 
-.PHONY: all
+
+.PHONY: all clean
diff --git a/gowrikumar/Makefile b/gowrikumar/Makefile
index ef886fd..00fcf23 100644
--- a/gowrikumar/Makefile
+++ b/gowrikumar/Makefile
@@ -6,5 +6,8 @@ export BINDIR
 all:
 	cd src && $(MAKE)
 
+clean:
+	rm -v $(BINDIR)/*
 
-.PHONY: all
+
+.PHONY: all clean

From 376ef0353f846dbc9f6fe32c43005b156679ccb3 Mon Sep 17 00:00:00 2001
From: Dan Buch <daniel.buch@gmail.com>
Date: Sat, 18 Jun 2011 14:07:11 -0400
Subject: [PATCH 10/25] just some dumb makefile cleanup

---
 Makefile                | 10 ++++++----
 gowrikumar/Makefile     |  7 ++++---
 gowrikumar/src/Makefile |  2 --
 3 files changed, 10 insertions(+), 9 deletions(-)

diff --git a/Makefile b/Makefile
index de20a16..4b51e73 100644
--- a/Makefile
+++ b/Makefile
@@ -1,12 +1,14 @@
-DEBUG :=
-export DEBUG
+CD = cd
+RM = rm -v
+
+export CD RM
 
 
 all:
-	cd gowrikumar && $(MAKE)
+	$(CD) gowrikumar && $(MAKE)
 
 clean:
-	cd gowrikumar && $(MAKE) clean
+	$(CD) gowrikumar && $(MAKE) clean
 
 
 .PHONY: all clean
diff --git a/gowrikumar/Makefile b/gowrikumar/Makefile
index 00fcf23..37177b9 100644
--- a/gowrikumar/Makefile
+++ b/gowrikumar/Makefile
@@ -1,13 +1,14 @@
-BINDIR := ./bin
+# puzzles from http://www.gowrikumar.com/c/
 
+BINDIR := $(PWD)/bin
 export BINDIR
 
 
 all:
-	cd src && $(MAKE)
+	$(CD) src && $(MAKE)
 
 clean:
-	rm -v $(BINDIR)/*
+	$(RM) $(BINDIR)/*
 
 
 .PHONY: all clean
diff --git a/gowrikumar/src/Makefile b/gowrikumar/src/Makefile
index b8b21ff..80b475b 100644
--- a/gowrikumar/src/Makefile
+++ b/gowrikumar/src/Makefile
@@ -1,7 +1,5 @@
 # puzzles from http://www.gowrikumar.com/c/
 
-BINDIR := ../bin
-
 ALL_BIN := $(patsubst %.c,$(BINDIR)/%,$(wildcard *.c))
 
 

From 79436cc73118e4dda8226ebc24649ff477d3f552 Mon Sep 17 00:00:00 2001
From: Dan Buch <daniel.buch@gmail.com>
Date: Sat, 18 Jun 2011 14:28:00 -0400
Subject: [PATCH 11/25] futzing around with macros some more

---
 Makefile                      |  4 +++-
 gowrikumar/src/04b-macrodef.c | 42 +++++++++++++++++++++++++++++++++++
 gowrikumar/src/Makefile       |  2 +-
 3 files changed, 46 insertions(+), 2 deletions(-)
 create mode 100644 gowrikumar/src/04b-macrodef.c

diff --git a/Makefile b/Makefile
index 4b51e73..ac357a5 100644
--- a/Makefile
+++ b/Makefile
@@ -1,7 +1,9 @@
 CD = cd
 RM = rm -v
 
-export CD RM
+CFLAGS := -std=c99
+
+export CD RM CFLAGS
 
 
 all:
diff --git a/gowrikumar/src/04b-macrodef.c b/gowrikumar/src/04b-macrodef.c
new file mode 100644
index 0000000..3dd0bc4
--- /dev/null
+++ b/gowrikumar/src/04b-macrodef.c
@@ -0,0 +1,42 @@
+/**
+ * :author: Dan Buch (daniel.buch@gmail.com)
+ */
+
+#include <stdio.h>
+
+#define f(a, b) a##b
+#define g(a) #a
+#define h(a) g(a)
+#define border(c) \
+    for (int i = 0; i < 60; i++) { \
+        printf(c); \
+    } \
+    printf("\n");
+
+int main()
+{
+    printf("%s\n", h(f(1, 2)));
+    printf("%s\n", g(f(1, 2)));
+
+    printf("%s\n", g(printf("dogs rule cats drool\n")));
+
+    char * hambones = "Cats! " g(ham);
+    char * bonesham = "Meats! " g(bones);
+    char * tmp;
+
+    border("-");
+    printf("bonesham = %s\n", bonesham);
+    printf("hambones = %s\n", hambones);
+
+    border("-");
+    tmp = f(ham, bones);
+    f(ham, bones) = f(bones, ham);
+    f(bones, ham) = tmp;
+
+    printf("bonesham = %s\n", bonesham);
+    printf("hambones = %s\n", hambones);
+    return 0;
+}
+
+/* vim:filetype=c:fileencoding=utf-8
+ */
diff --git a/gowrikumar/src/Makefile b/gowrikumar/src/Makefile
index 80b475b..738079a 100644
--- a/gowrikumar/src/Makefile
+++ b/gowrikumar/src/Makefile
@@ -4,7 +4,7 @@ ALL_BIN := $(patsubst %.c,$(BINDIR)/%,$(wildcard *.c))
 
 
 $(BINDIR)/%: %.c
-	$(CC) -o $@ $<
+	$(CC) $(CFLAGS) -o $@ $<
 
 all: $(ALL_BIN)
 

From b1172d6c6e3b86f001227f9ced91b5fff9194b44 Mon Sep 17 00:00:00 2001
From: Dan Buch <daniel.buch@gmail.com>
Date: Sat, 18 Jun 2011 15:06:29 -0400
Subject: [PATCH 12/25] futzing with relationship between switch/case and
 labels

---
 .gitignore                     |  2 ++
 Makefile                       |  3 ++-
 gowrikumar/src/05-switchint.c  | 24 ++++++++++++++++++++++++
 gowrikumar/src/05b-switchint.c | 32 ++++++++++++++++++++++++++++++++
 4 files changed, 60 insertions(+), 1 deletion(-)
 create mode 100644 gowrikumar/src/05-switchint.c
 create mode 100644 gowrikumar/src/05b-switchint.c

diff --git a/.gitignore b/.gitignore
index d800b0d..fe46976 100644
--- a/.gitignore
+++ b/.gitignore
@@ -1 +1,3 @@
 gowrikumar/bin
+*.i
+*.s
diff --git a/Makefile b/Makefile
index ac357a5..e1682e8 100644
--- a/Makefile
+++ b/Makefile
@@ -1,7 +1,8 @@
 CD = cd
 RM = rm -v
 
-CFLAGS := -std=c99
+CC := gcc
+CFLAGS := -std=c99 -Wall
 
 export CD RM CFLAGS
 
diff --git a/gowrikumar/src/05-switchint.c b/gowrikumar/src/05-switchint.c
new file mode 100644
index 0000000..6a5b568
--- /dev/null
+++ b/gowrikumar/src/05-switchint.c
@@ -0,0 +1,24 @@
+/**
+ * :author: Dan Buch (daniel.buch@gmail.com)
+ */
+
+#include<stdio.h>
+int main()
+{
+    int a=10;
+    switch(a)
+    {
+        case '1':
+            printf("ONE\n");
+            break;
+        case '2':
+            printf("TWO\n");
+            break;
+        defa1ut:
+            printf("NONE\n");
+    }
+    return 0;
+}
+
+/* vim:filetype=c:fileencoding=utf-8
+ */
diff --git a/gowrikumar/src/05b-switchint.c b/gowrikumar/src/05b-switchint.c
new file mode 100644
index 0000000..99368be
--- /dev/null
+++ b/gowrikumar/src/05b-switchint.c
@@ -0,0 +1,32 @@
+/**
+ * :author: Dan Buch (daniel.buch@gmail.com)
+ */
+
+#define MAGIC_NUMBER 10
+
+#include<stdio.h>
+int main()
+{
+    int a = MAGIC_NUMBER;
+    switch(a)
+    {
+        case '1':
+            printf("ONE\n");
+            break;
+        case '2':
+            printf("TWO\n");
+            break;
+        defalut:
+            printf("NO CAN SPELL\n");
+            break;
+        defau1t:
+            printf("SO CLOSE, YET SO FAR\n");
+            break;
+        default:
+            printf("NONE\n");
+    }
+    return 0;
+}
+
+/* vim:filetype=c:fileencoding=utf-8
+ */

From 70d09f33a1e932baba65d816909336b50759a48c Mon Sep 17 00:00:00 2001
From: Dan Buch <daniel.buch@gmail.com>
Date: Sat, 18 Jun 2011 15:27:23 -0400
Subject: [PATCH 13/25] sizeof integer pointers ?

---
 gowrikumar/src/06-ia64segfault.c | 16 ++++++++++++++++
 1 file changed, 16 insertions(+)
 create mode 100644 gowrikumar/src/06-ia64segfault.c

diff --git a/gowrikumar/src/06-ia64segfault.c b/gowrikumar/src/06-ia64segfault.c
new file mode 100644
index 0000000..6e35d74
--- /dev/null
+++ b/gowrikumar/src/06-ia64segfault.c
@@ -0,0 +1,16 @@
+/**
+ * :author: Dan Buch (daniel.buch@gmail.com)
+ */
+
+#include <stdlib.h>
+
+int main()
+{
+    int* p;
+    p = (int*)malloc(sizeof(int));
+    *p = 10;
+    return 0;
+}
+
+/* vim:filetype=c:fileencoding=utf-8
+ */

From a414f515d1e18b373b46024e825148571d028e63 Mon Sep 17 00:00:00 2001
From: Dan Buch <daniel.buch@gmail.com>
Date: Sat, 18 Jun 2011 19:28:20 -0400
Subject: [PATCH 14/25] must. get. 64-bit machine.

---
 gowrikumar/src/06b-ia64segfault.c | 29 +++++++++++++++++++++++++++++
 1 file changed, 29 insertions(+)
 create mode 100644 gowrikumar/src/06b-ia64segfault.c

diff --git a/gowrikumar/src/06b-ia64segfault.c b/gowrikumar/src/06b-ia64segfault.c
new file mode 100644
index 0000000..57bc6f2
--- /dev/null
+++ b/gowrikumar/src/06b-ia64segfault.c
@@ -0,0 +1,29 @@
+/**
+ * :author: Dan Buch (daniel.buch@gmail.com)
+ */
+
+#include <stdlib.h>
+#include <stdio.h>
+
+int main()
+{
+    int* p;
+
+    size_t size_of_int = sizeof(int);
+    printf("sizeof(int) = %d\n", size_of_int);
+
+    p = (int*)malloc(sizeof(int));
+
+    size_t size_of_p = sizeof(p);
+    printf("sizeof(p) = %d\n", size_of_p);
+
+    *p = 10;
+
+    size_t size_of_ptr_p = sizeof(*p);
+    printf("sizeof(*p) = %d\n", size_of_ptr_p);
+
+    return 0;
+}
+
+/* vim:filetype=c:fileencoding=utf-8
+ */

From f20b8ca1389e20c36286eed158120c971fea720a Mon Sep 17 00:00:00 2001
From: Dan Buch <daniel.buch@gmail.com>
Date: Sat, 18 Jun 2011 19:37:54 -0400
Subject: [PATCH 15/25] counting bits!

---
 gowrikumar/src/07-countbits.c | 40 +++++++++++++++++++++++++++++++++++
 1 file changed, 40 insertions(+)
 create mode 100644 gowrikumar/src/07-countbits.c

diff --git a/gowrikumar/src/07-countbits.c b/gowrikumar/src/07-countbits.c
new file mode 100644
index 0000000..73a72dc
--- /dev/null
+++ b/gowrikumar/src/07-countbits.c
@@ -0,0 +1,40 @@
+/**
+ * :author: Dan Buch (daniel.buch@gmail.com)
+ */
+
+#include <stdio.h>
+
+static unsigned int mask[] = {
+    0x55555555,
+    0x33333333,
+    0x0F0F0F0F,
+    0x00FF00FF,
+    0x0000FFFF
+};
+
+
+int get_bit_count(unsigned int x)
+{
+
+    int i;
+    int shift; /* Number of positions to shift to right*/
+    for (i = 0, shift = 1; i < 5; i++, shift *= 2) {
+        x = (x & mask[i])+ ((x >> shift) & mask[i]);
+    }
+    return x;
+}
+
+
+int main()
+{
+    int to_test[] = {0, 5, 7};
+    int current;
+
+    for (int i = 0; i < 3 ; i++) {
+        current = to_test[i];
+        printf("get_bit_count(%d) = %d\n", current, get_bit_count(current));
+    }
+}
+
+/* vim:filetype=c:fileencoding=utf-8
+ */

From b447c7a61aae763f5f8a4b203efcd7a3193aa663 Mon Sep 17 00:00:00 2001
From: Dan Buch <daniel.buch@gmail.com>
Date: Sat, 18 Jun 2011 19:39:37 -0400
Subject: [PATCH 16/25] more futzing with whitespace in bit counter

---
 gowrikumar/src/07-countbits.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/gowrikumar/src/07-countbits.c b/gowrikumar/src/07-countbits.c
index 73a72dc..aad54a4 100644
--- a/gowrikumar/src/07-countbits.c
+++ b/gowrikumar/src/07-countbits.c
@@ -19,7 +19,7 @@ int get_bit_count(unsigned int x)
     int i;
     int shift; /* Number of positions to shift to right*/
     for (i = 0, shift = 1; i < 5; i++, shift *= 2) {
-        x = (x & mask[i])+ ((x >> shift) & mask[i]);
+        x = (x & mask[i]) + ((x >> shift) & mask[i]);
     }
     return x;
 }

From 9ab4fa72796297632cc68f6c751339e7a04a47a7 Mon Sep 17 00:00:00 2001
From: Dan Buch <daniel.buch@gmail.com>
Date: Sat, 18 Jun 2011 19:57:39 -0400
Subject: [PATCH 17/25] a more verbose version of the bit counter

---
 gowrikumar/src/07b-countbits.c | 67 ++++++++++++++++++++++++++++++++++
 1 file changed, 67 insertions(+)
 create mode 100644 gowrikumar/src/07b-countbits.c

diff --git a/gowrikumar/src/07b-countbits.c b/gowrikumar/src/07b-countbits.c
new file mode 100644
index 0000000..e363587
--- /dev/null
+++ b/gowrikumar/src/07b-countbits.c
@@ -0,0 +1,67 @@
+/**
+ * :author: Dan Buch (daniel.buch@gmail.com)
+ */
+
+#include <stdio.h>
+
+static unsigned int mask[] = {
+    0x55555555,
+    0x33333333,
+    0x0F0F0F0F,
+    0x00FF00FF,
+    0x0000FFFF
+};
+
+
+int get_bit_count(unsigned int x)
+{
+    printf("get_bit_count(%d)\n", x);
+
+    int i;
+    int x_and_mask;
+    int x_shifted;
+    int x_shifted_and_mask;
+    int shift; /* Number of positions to shift to right*/
+    for (i = 0, shift = 1; i < 5; i++, shift *= 2) {
+        printf("    START loop\n");
+        printf("        i = %d, x = %d, shift = %d\n", i, x, shift);
+
+        x_and_mask = x & mask[i];
+        printf("        x & mask[i] = %d\n", x_and_mask);
+
+        x_shifted = x >> shift;
+        printf("        x >> shift = %d\n", x_shifted);
+
+        x_shifted_and_mask = x_shifted & mask[i];
+        printf("        (x >> shift) & mask[i] = %d\n", x_shifted_and_mask);
+
+        x = x_and_mask + x_shifted_and_mask;
+        printf("        x = %d\n", x);
+        printf("    END loop\n");
+    }
+
+    return x;
+}
+
+
+int main()
+{
+    int to_test[] = {0, 5, 7};
+    int current;
+
+    /*
+    size_t mask_len = sizeof(mask) / sizeof(unsigned int);
+
+    for (int i = 0; i < mask_len; i++) {
+        printf("mask[%d] = %d\n", i, mask[i]);
+    }
+    */
+
+    for (int i = 0; i < 3 ; i++) {
+        current = to_test[i];
+        printf("get_bit_count(%d) -> %d\n", current, get_bit_count(current));
+    }
+}
+
+/* vim:filetype=c:fileencoding=utf-8
+ */

From 3c51da2e98c42321fe95825950261cc40a820cdc Mon Sep 17 00:00:00 2001
From: Dan Buch <daniel.buch@gmail.com>
Date: Sat, 18 Jun 2011 20:01:05 -0400
Subject: [PATCH 18/25] futzing with a tricky float increment

---
 gowrikumar/src/08-incrfloat.c | 26 ++++++++++++++++++++++++++
 1 file changed, 26 insertions(+)
 create mode 100644 gowrikumar/src/08-incrfloat.c

diff --git a/gowrikumar/src/08-incrfloat.c b/gowrikumar/src/08-incrfloat.c
new file mode 100644
index 0000000..cae6c20
--- /dev/null
+++ b/gowrikumar/src/08-incrfloat.c
@@ -0,0 +1,26 @@
+/**
+ * :author: Dan Buch (daniel.buch@gmail.com)
+ */
+
+#include <stdio.h>
+
+int main()
+{
+    float f = 0.0f;
+    int i;
+
+    for (i = 0; i < 10; i++) {
+        f = f + 0.1f;
+    }
+
+    if (f == 1.0f) {
+        printf("f is 1.0 \n");
+    } else {
+        printf("f is NOT 1.0\n");
+    }
+
+    return 0;
+}
+
+/* vim:filetype=c:fileencoding=utf-8
+ */

From cf6f47c9900479c14bbee563661d10966f6c0e09 Mon Sep 17 00:00:00 2001
From: Dan Buch <daniel.buch@gmail.com>
Date: Sun, 19 Jun 2011 07:28:23 -0400
Subject: [PATCH 19/25] float comparison!

---
 gowrikumar/src/08b-incrfloat.c | 43 ++++++++++++++++++++++++++++++++++
 1 file changed, 43 insertions(+)
 create mode 100644 gowrikumar/src/08b-incrfloat.c

diff --git a/gowrikumar/src/08b-incrfloat.c b/gowrikumar/src/08b-incrfloat.c
new file mode 100644
index 0000000..782aedb
--- /dev/null
+++ b/gowrikumar/src/08b-incrfloat.c
@@ -0,0 +1,43 @@
+/**
+ * :author: Dan Buch (daniel.buch@gmail.com)
+ */
+
+#include <stdio.h>
+#include <math.h>
+
+int main()
+{
+    float f = 0.0f;
+    int i;
+
+    for (i = 0; i < 10; i++) {
+        f = f + 0.1f;
+    }
+
+    if (f == 1.0) {
+        printf("f is 1.0 \n");
+        /* nope! */
+    }
+
+    if (f == 1.000000) {
+        printf("f is perhaps 1.000000?\n");
+        /* nope again */
+    }
+
+    printf("f is neither 1.0 nor 1.000000\n");
+    printf("(f is really %.24f)\n", f);
+    printf("OH NOES!\n");
+    printf("But...\n");
+
+    double difference = fabs(f - 1.000000);
+
+    if (difference < 0.00001) {
+        printf("f is close enough to 1.000000 (off by %.24f)\n", difference);
+        /* yes? */
+    } 
+
+    return 0;
+}
+
+/* vim:filetype=c:fileencoding=utf-8
+ */

From 803101b36f1804b41a7e261380437acc456e8d21 Mon Sep 17 00:00:00 2001
From: Dan Buch <daniel.buch@gmail.com>
Date: Sun, 19 Jun 2011 07:37:44 -0400
Subject: [PATCH 20/25] another bug exercise

---
 gowrikumar/src/09-multipleassignment.c | 20 ++++++++++++++++++++
 1 file changed, 20 insertions(+)
 create mode 100644 gowrikumar/src/09-multipleassignment.c

diff --git a/gowrikumar/src/09-multipleassignment.c b/gowrikumar/src/09-multipleassignment.c
new file mode 100644
index 0000000..3cf7b4b
--- /dev/null
+++ b/gowrikumar/src/09-multipleassignment.c
@@ -0,0 +1,20 @@
+/**
+ * :author: Dan Buch (daniel.buch@gmail.com)
+ */
+
+#include <stdio.h>
+
+int main()
+{
+    /* FIXME: the comma after "a = 1" makes the compiler angry.  Either the
+     * ", 2" should be removed or another assignment should be added.
+    int a = 1, 2;
+    */
+    int a = 1, b = 2;
+    printf("a: %d\n", a);
+    printf("b: %d\n", b);
+    return 0;
+}
+
+/* vim:filetype=c:fileencoding=utf-8
+ */

From b95730410bd07883895295bd7e1192cdaeb2d6bd Mon Sep 17 00:00:00 2001
From: Dan Buch <daniel.buch@gmail.com>
Date: Sun, 19 Jun 2011 07:45:12 -0400
Subject: [PATCH 21/25] futzing with printf return

---
 gowrikumar/src/10-nestedprintf.c  | 15 +++++++++++++++
 gowrikumar/src/10b-nestedprintf.c | 17 +++++++++++++++++
 2 files changed, 32 insertions(+)
 create mode 100644 gowrikumar/src/10-nestedprintf.c
 create mode 100644 gowrikumar/src/10b-nestedprintf.c

diff --git a/gowrikumar/src/10-nestedprintf.c b/gowrikumar/src/10-nestedprintf.c
new file mode 100644
index 0000000..857741c
--- /dev/null
+++ b/gowrikumar/src/10-nestedprintf.c
@@ -0,0 +1,15 @@
+/**
+ * :author: Dan Buch (daniel.buch@gmail.com)
+ */
+
+#include <stdio.h>
+
+int main()
+{
+    int i = 43;
+    printf("%d\n", printf("%d", printf("%d", i)));
+    return 0;
+}
+
+/* vim:filetype=c:fileencoding=utf-8
+ */
diff --git a/gowrikumar/src/10b-nestedprintf.c b/gowrikumar/src/10b-nestedprintf.c
new file mode 100644
index 0000000..0e0304d
--- /dev/null
+++ b/gowrikumar/src/10b-nestedprintf.c
@@ -0,0 +1,17 @@
+/**
+ * :author: Dan Buch (daniel.buch@gmail.com)
+ */
+
+#include <stdio.h>
+
+int main()
+{
+    int i = 43, nprinted;
+    nprinted = printf("%d\n", printf("%d", printf("%d", i)));
+    nprinted = printf("(the last one was %d characters)\n", nprinted);
+    nprinted = printf("(and that was %d characters)\n", nprinted);
+    return 0;
+}
+
+/* vim:filetype=c:fileencoding=utf-8
+ */

From 2f315a6353843cdb35d505f15ca993a80dc9fb89 Mon Sep 17 00:00:00 2001
From: Dan Buch <daniel.buch@gmail.com>
Date: Sun, 19 Jun 2011 18:27:45 -0400
Subject: [PATCH 22/25] working on "duff" example led me to futzing with gdb,
 found out the gdb tutorial is kinda (a lot) outdated

---
 .gitignore                |  1 +
 Makefile                  |  4 +++-
 gdbtut/Makefile           | 14 ++++++++++++++
 gdbtut/bin/.keep          |  0
 gdbtut/src/Makefile       | 12 ++++++++++++
 gdbtut/src/segfault.c     | 28 +++++++++++++++++++++++++++
 gowrikumar/src/11-duff.c  | 37 ++++++++++++++++++++++++++++++++++++
 gowrikumar/src/11b-duff.c | 40 +++++++++++++++++++++++++++++++++++++++
 8 files changed, 135 insertions(+), 1 deletion(-)
 create mode 100644 gdbtut/Makefile
 create mode 100644 gdbtut/bin/.keep
 create mode 100644 gdbtut/src/Makefile
 create mode 100644 gdbtut/src/segfault.c
 create mode 100644 gowrikumar/src/11-duff.c
 create mode 100644 gowrikumar/src/11b-duff.c

diff --git a/.gitignore b/.gitignore
index fe46976..e1392e7 100644
--- a/.gitignore
+++ b/.gitignore
@@ -1,3 +1,4 @@
 gowrikumar/bin
+gdbtut/bin
 *.i
 *.s
diff --git a/Makefile b/Makefile
index e1682e8..617e404 100644
--- a/Makefile
+++ b/Makefile
@@ -2,16 +2,18 @@ CD = cd
 RM = rm -v
 
 CC := gcc
-CFLAGS := -std=c99 -Wall
+CFLAGS := -std=c99 -Wall -g
 
 export CD RM CFLAGS
 
 
 all:
 	$(CD) gowrikumar && $(MAKE)
+	$(CD) gdbtut && $(MAKE)
 
 clean:
 	$(CD) gowrikumar && $(MAKE) clean
+	$(CD) gdbtut && $(MAKE) clean
 
 
 .PHONY: all clean
diff --git a/gdbtut/Makefile b/gdbtut/Makefile
new file mode 100644
index 0000000..d7d488d
--- /dev/null
+++ b/gdbtut/Makefile
@@ -0,0 +1,14 @@
+# tutorial exercises from http://www.unknownroad.com/rtfm/gdbtut/
+
+BINDIR := $(PWD)/bin
+export BINDIR
+
+
+all:
+	$(CD) src && $(MAKE)
+
+clean:
+	$(RM) $(BINDIR)/*
+
+
+.PHONY: all clean
diff --git a/gdbtut/bin/.keep b/gdbtut/bin/.keep
new file mode 100644
index 0000000..e69de29
diff --git a/gdbtut/src/Makefile b/gdbtut/src/Makefile
new file mode 100644
index 0000000..854655b
--- /dev/null
+++ b/gdbtut/src/Makefile
@@ -0,0 +1,12 @@
+# tutorial exercises from http://www.unknownroad.com/rtfm/gdbtut/
+
+ALL_BIN := $(patsubst %.c,$(BINDIR)/%,$(wildcard *.c))
+
+
+$(BINDIR)/%: %.c
+	$(CC) $(CFLAGS) -o $@ $<
+
+all: $(ALL_BIN)
+
+
+.PHONY: all
diff --git a/gdbtut/src/segfault.c b/gdbtut/src/segfault.c
new file mode 100644
index 0000000..11e93a1
--- /dev/null
+++ b/gdbtut/src/segfault.c
@@ -0,0 +1,28 @@
+/**
+ * :author: Dan Buch (daniel.buch@gmail.com)
+ */
+
+#include <stdio.h>
+#include <stdlib.h>
+
+int main(int argc, char **argv)
+{
+    char *buf;
+    long long huge = 8000000000000000000;
+    /* Okay, so this is *not* going to segfault because
+     * the way memory is allocated has changed since
+     * the tutorial was written.  The segfault is supposed
+     * to happen when more memory is allocated than is
+     * available on the machine.  So much for that exercise.
+     */
+
+    buf = malloc(huge);
+
+    fgets(buf, 1024, stdin);
+    printf("%s\n", buf);
+
+    return 1;
+}
+
+/* vim:filetype=c:fileencoding=utf-8
+ */
diff --git a/gowrikumar/src/11-duff.c b/gowrikumar/src/11-duff.c
new file mode 100644
index 0000000..bb7dbfd
--- /dev/null
+++ b/gowrikumar/src/11-duff.c
@@ -0,0 +1,37 @@
+/**
+ * :author: Dan Buch (daniel.buch@gmail.com)
+ */
+
+#include <stdio.h>
+
+void duff(register char *to, register char *from, register int count)
+{
+    register int n = (count + 7) / 8;
+    switch (count % 8) {
+        case 0: do { *to++ = *from++;
+        case 7: *to++ = *from++;
+        case 6: *to++ = *from++;
+        case 5: *to++ = *from++;
+        case 4: *to++ = *from++;
+        case 3: *to++ = *from++;
+        case 2: *to++ = *from++;
+        case 1: *to++ = *from++;
+        } while (--n > 0);
+    }
+}
+
+int main()
+{
+    char * to = "dogs cats babies";
+    char * from = "monkey hat pants";
+    int i = 16;
+    printf("to = %s\n", to);
+    printf("from = %s\n", from);
+    /* And here comes the segfault... */
+    duff(to, from, i);
+    printf("to = %s\n", to);
+    printf("from = %s\n", from);
+}
+
+/* vim:filetype=c:fileencoding=utf-8
+ */
diff --git a/gowrikumar/src/11b-duff.c b/gowrikumar/src/11b-duff.c
new file mode 100644
index 0000000..3139220
--- /dev/null
+++ b/gowrikumar/src/11b-duff.c
@@ -0,0 +1,40 @@
+/**
+ * :author: Dan Buch (daniel.buch@gmail.com)
+ */
+
+#include <stdio.h>
+
+void duff(register char *to, register char *from, register int count)
+{
+    register int n;
+
+    int remainder = count % 8;
+    if (remainder == 0) {
+        n = (count + 7) / 8;
+        do {
+            *to++ = *from++;
+        } while (--n > 0);
+    } else if (remainder <= 7 && remainder > 0) {
+        int i;
+        int c;
+        for (i = 0; (c = from[i] && c != EOF); i++) {
+            to[i] = c;
+        }
+    }
+}
+
+int main()
+{
+    char * to = "dogs cats babies";
+    char * from = "monkey hat pants";
+    int i = 11;
+    printf("to = %s\n", to);
+    printf("from = %s\n", from);
+    /* And here comes the segfault... */
+    duff(to, from, i);
+    printf("to = %s\n", to);
+    printf("from = %s\n", from);
+}
+
+/* vim:filetype=c:fileencoding=utf-8
+ */

From 0e86ed72e28d0db41603e29aa60e7bb10400b00d Mon Sep 17 00:00:00 2001
From: Dan Buch <daniel.buch@gmail.com>
Date: Sun, 19 Jun 2011 18:29:53 -0400
Subject: [PATCH 23/25] here's your README, github ;-)

---
 README | 3 +++
 1 file changed, 3 insertions(+)
 create mode 100644 README

diff --git a/README b/README
new file mode 100644
index 0000000..52b53eb
--- /dev/null
+++ b/README
@@ -0,0 +1,3 @@
+I don't get paid to write C for a living, so I have to sneak in practice here
+and there.  Maybe once the kiddo goes to college I can become a kernel hacker
+:-P (assuming there's still such a thing as a kernel.)

From 74dfe433b92946393bf38a425e4adb6cf1c6f232 Mon Sep 17 00:00:00 2001
From: Dan Buch <daniel.buch@gmail.com>
Date: Sun, 19 Jun 2011 18:38:51 -0400
Subject: [PATCH 24/25] alternate implementation of CountBits

---
 gowrikumar/src/12-countbits2.c | 32 ++++++++++++++++++++++++++++++++
 1 file changed, 32 insertions(+)
 create mode 100644 gowrikumar/src/12-countbits2.c

diff --git a/gowrikumar/src/12-countbits2.c b/gowrikumar/src/12-countbits2.c
new file mode 100644
index 0000000..d79e1ce
--- /dev/null
+++ b/gowrikumar/src/12-countbits2.c
@@ -0,0 +1,32 @@
+/**
+ * :author: Dan Buch (daniel.buch@gmail.com)
+ */
+
+#include <stdio.h>
+
+
+int get_bit_count(unsigned int x)
+{
+    int count=0;
+    while(x)
+    {
+        count++;
+        x = x&(x-1);
+    }
+    return count;
+}
+
+
+int main()
+{
+    int to_test[] = {0, 5, 7};
+    int current;
+
+    for (int i = 0; i < 3 ; i++) {
+        current = to_test[i];
+        printf("get_bit_count(%d) = %d\n", current, get_bit_count(current));
+    }
+}
+
+/* vim:filetype=c:fileencoding=utf-8
+ */

From ef128a996fc826339bbc3d9deea376932caf6981 Mon Sep 17 00:00:00 2001
From: Dan Buch <daniel.buch@gmail.com>
Date: Sun, 6 Nov 2011 09:53:00 -0500
Subject: [PATCH 25/25] a little futzing around with sockets while reading
 through the linux programming interface book

---
 .gitignore | 10 ++++++----
 Makefile   |  4 +++-
 socky.c    | 48 ++++++++++++++++++++++++++++++++++++++++++++++++
 3 files changed, 57 insertions(+), 5 deletions(-)
 create mode 100644 socky.c

diff --git a/.gitignore b/.gitignore
index e1392e7..640ef7a 100644
--- a/.gitignore
+++ b/.gitignore
@@ -1,4 +1,6 @@
-gowrikumar/bin
-gdbtut/bin
-*.i
-*.s
+*
+!gowrikumar/bin
+!gdbtut/bin
+!*.i
+!*.s
+!*.c
diff --git a/Makefile b/Makefile
index 617e404..03c063e 100644
--- a/Makefile
+++ b/Makefile
@@ -4,10 +4,12 @@ RM = rm -v
 CC := gcc
 CFLAGS := -std=c99 -Wall -g
 
+ALL_TARGETS := $(patsubst %.c,%,$(wildcard *.c))
+
 export CD RM CFLAGS
 
 
-all:
+all: $(ALL_TARGETS)
 	$(CD) gowrikumar && $(MAKE)
 	$(CD) gdbtut && $(MAKE)
 
diff --git a/socky.c b/socky.c
new file mode 100644
index 0000000..cf27e98
--- /dev/null
+++ b/socky.c
@@ -0,0 +1,48 @@
+#include <stdio.h>
+#include <string.h>
+#include <stdlib.h>
+#include <sys/un.h>
+#include <sys/types.h>
+#include <sys/socket.h>
+
+const char *SOCKNAME = "/tmp/socky";
+int sfd;
+struct sockaddr_un addr;
+
+
+int main(int argc, char *argv[])
+{
+    sfd = socket(AF_UNIX, SOCK_STREAM, 0);
+    if (sfd == -1) {
+        fprintf(stderr, "FAILED TO ALLOCATE SOCKET\n");
+        goto error;
+    }
+
+    memset(&addr, 0, sizeof(struct sockaddr_un));
+    addr.sun_family = AF_UNIX;
+    strncpy(addr.sun_path, SOCKNAME, sizeof(addr.sun_path) - 1);
+
+    if (bind(sfd, (struct sockaddr *)&addr, sizeof(struct sockaddr_un)) == -1) {
+        fprintf(stderr, "FAILED TO BIND SOCKET TO ADDRESS\n");
+        goto error;
+    }
+
+    if (listen(sfd, 128) == -1) {
+        fprintf(stderr, "FAILED TO LISTEN ON ADDRESS\n");
+        goto error;
+    }
+
+    for (;;) {
+        fprintf(stdout, "ATTEMPTING TO WAIT FOR REQUEST ON %s\n", SOCKNAME);
+        if (accept(sfd, NULL, NULL) == -1) {
+            fprintf(stderr, "FAILED TO ACCEPT REQUEST ON ADDRESS\n");
+            goto error;
+        }
+    }
+
+    return 0;
+
+error:
+    return 1;
+
+}