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cls / roman.c
Last active August 29, 2015 14:16
Roman numeral parser
#include <stdio.h>
enum { I, V, X, L, C, D, M, StackSize };
const int values[] = { 1, 5, 10, 50, 100, 500, 1000 };
int
unroman(const char *s)
{
int stack[StackSize];
@cls
cls / CovariantIterator.java
Last active August 29, 2015 14:17
Adaptor for covariant iterators in Java
import java.util.Iterator;
public class CovariantIterator<T extends U, U> implements Iterator<U>
{
private Iterator<T> iter;
public CovariantIterator(Iterator<T> it)
{
this.iter = it;
}
@cls
cls / intern.c
Last active August 29, 2015 14:23
Interning strings with a prefix tree
#include <limits.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
const char *
intern(const char *s)
{
union tree {
const char *str;
@cls
cls / next.sh
Last active May 27, 2016 12:24
Script to execute the next binary along in $PATH
#!/bin/sh
dir=${1%/*}
bin=${1##*/}
shift
unset flag
set -f
IFS=:
@cls
cls / repack.py
Last active February 16, 2017 17:42
Repacking structs to minimise bit wastage
from queue import PriorityQueue
class Field:
def __init__(self, size, align):
self.size = size
self.align = align
class Struct:
def __init__(self, fields):
size = 0
@cls
cls / catalan.py
Created February 20, 2017 14:45
Calculating the Catalan number series
from fractions import Fraction
def catalan(n):
c = 1
for k in range(2, n + 1):
c *= Fraction(n + k, k)
return int(c)
@cls
cls / cartesian.hs
Created February 21, 2017 11:09
Cartesian product over lists
cartesian :: [[a]] -> [[a]]
cartesian [] = [[]]
cartesian (xs:zss) = [x:ys | x <- xs, ys <- cartesian zss]
@cls
cls / ucd.awk
Last active July 13, 2017 11:35
Script to extract certain fields from the Unicode Character Database
BEGIN { FS = ";"; OFS = ","; }
{ name = $2; }
name ~ /<.*>/ { name = $11; }
name { print $1, name, $3; }
@cls
cls / utf8base64.c
Last active August 7, 2017 22:03
Print non-ASCII UTF-8 sequences' unique Base64 identifiers
#include <stdio.h>
const char clo[64] = {
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1,
2, 2, 2, 2, 2, 2, 2, 2, 3, 3, 3, 3, 4, 4, 5, 6,
};
const char b64[64] = {
@cls
cls / debruijn.hs
Last active October 21, 2017 12:22
Untyped lambda calculus with De Bruijn indices as a nested data type
import Control.Applicative (liftA2)
data Term a = App (Term a) (Term a)
| Lam (Term (Maybe a))
| Var a
instance Functor Term where
fmap f (App s t) = App (fmap f s) (fmap f t)
fmap f (Lam t) = Lam (fmap (fmap f) t)
fmap f (Var x) = Var (f x)