From 43db7108aa49e030e398e98599c401d9ca408e58 Mon Sep 17 00:00:00 2001
From: Dan Buch <daniel.buch@gmail.com>
Date: Wed, 17 Aug 2011 23:07:18 -0400
Subject: [PATCH] futzing around with C and Ruby implementations

---
 .gitignore           |  2 ++
 Makefile             | 14 ++++++++++++++
 bench                |  7 ++++---
 bin/.keep            |  0
 sorting.rb           | 12 ++++++++++++
 src/Makefile         |  8 ++++++++
 src/insertion-sort.c | 38 ++++++++++++++++++++++++++++++++++++++
 test_sorting.rb      | 20 ++++++++++++++++++++
 8 files changed, 98 insertions(+), 3 deletions(-)
 create mode 100644 .gitignore
 create mode 100644 Makefile
 create mode 100644 bin/.keep
 create mode 100644 sorting.rb
 create mode 100644 src/Makefile
 create mode 100644 src/insertion-sort.c
 create mode 100644 test_sorting.rb

diff --git a/.gitignore b/.gitignore
new file mode 100644
index 0000000..cc694be
--- /dev/null
+++ b/.gitignore
@@ -0,0 +1,2 @@
+bin/*
+*.o
diff --git a/Makefile b/Makefile
new file mode 100644
index 0000000..b8d6031
--- /dev/null
+++ b/Makefile
@@ -0,0 +1,14 @@
+BINDIR := $(PWD)/bin
+CFLAGS := -std=c99 -Wall -g
+
+export BINDIR CFLAGS
+
+
+all:
+	cd src && $(MAKE)
+
+clean:
+	rm -f bin/*
+
+
+.PHONY: all clean
diff --git a/bench b/bench
index c346b1a..08808c7 100755
--- a/bench
+++ b/bench
@@ -1,9 +1,10 @@
 #!/bin/bash
 
-SETUP="import sorting;import random;l = list(range(0, ${1-5000}));random.shuffle(l)"
+SETUP="import sorting"
+LIST="$(python -c "import random;l = list(range(0, ${1-5000}));random.shuffle(l);print(l)")"
 
 echo -n "insertion sort: "
-python -m timeit -s "$SETUP" 'sorting.insertion_sort(l)'
+python -m timeit -s "$SETUP" "sorting.insertion_sort($LIST)"
 
 echo -n "merge sort: "
-python -m timeit -s "$SETUP" 'sorting.merge_sort(l)'
+python -m timeit -s "$SETUP" "sorting.merge_sort($LIST)"
diff --git a/bin/.keep b/bin/.keep
new file mode 100644
index 0000000..e69de29
diff --git a/sorting.rb b/sorting.rb
new file mode 100644
index 0000000..f4f68fd
--- /dev/null
+++ b/sorting.rb
@@ -0,0 +1,12 @@
+def insertion_sort(a)
+  (0..(a.length - 1)).each do |j|
+    key = a[j]
+    i = j - 1
+    while (i >= 0) && (a[i] > key)
+      a[i + 1] = a[i]
+      i = i - 1
+    end
+    a[i + 1] = key
+  end
+end
+
diff --git a/src/Makefile b/src/Makefile
new file mode 100644
index 0000000..ae4a6d3
--- /dev/null
+++ b/src/Makefile
@@ -0,0 +1,8 @@
+all: $(BINDIR)/insertion-sort
+
+
+$(BINDIR)/insertion-sort: insertion-sort.c
+	gcc -o $@ $(CFLAGS) $^
+
+
+.PHONY: all
diff --git a/src/insertion-sort.c b/src/insertion-sort.c
new file mode 100644
index 0000000..be8594a
--- /dev/null
+++ b/src/insertion-sort.c
@@ -0,0 +1,38 @@
+#include <stdio.h>
+
+void insertion_sort(int * a, int len_a);
+
+
+int
+main(int argc, char ** argv)
+{
+    int i;
+    int l[] = {1, 4, 8, 9, 2, 3};
+
+    insertion_sort(l, 6);
+
+    for (i = 0; i < 6; i++) {
+        printf("%d\n", l[i]);
+    }
+}
+
+
+void
+insertion_sort(int * a, int len_a)
+{
+    int i, j, key;
+
+    for (j = 1; j < len_a; j++) {
+        key = a[j];
+        i = j - 1;
+        while ((i >= 0) && (a[i] > key)) {
+            a[i + 1] = a[i];
+            i = i - 1;
+        }
+        a[i + 1] = key;
+    }
+}
+
+
+/* vim:filetype=c
+ */
diff --git a/test_sorting.rb b/test_sorting.rb
new file mode 100644
index 0000000..165012f
--- /dev/null
+++ b/test_sorting.rb
@@ -0,0 +1,20 @@
+require 'sorting'
+
+
+def test_insertion_sort
+  tmpl = [8, 2, 4, 9, 3, 6]
+  a = Array.copy(tmpl)
+  expected = [2, 3, 4, 6, 8, 9]
+
+  insertion_sort(a)
+
+  if expected != a
+    throw Exception.new 'OMG FAIL' 
+  else
+    puts 'YAY!'
+  end
+
+end
+
+
+test_insertion_sort