Add an experimental `script' plugin

Basically reimplemented the macro language from libxntd.

Lots of work to be done yet, even if we keep it as a stand-alone TCC plugin.

1 files changed, 1819 insertions, 0 deletions

diff --git a/plugins/script b/plugins/script
new file mode 100755
index 0000000..34ca379
--- /dev/null
+++ b/plugins/script
@@ -0,0 +1,1819 @@
+#!/usr/bin/tcc -run
+//
+// ZyklonB scripting plugin, using a custom stack-based language
+//
+// Copyright 2014 Přemysl Janouch.  All rights reserved.
+// See the file LICENSE for licensing information.
+//
+// Just compile this file as usual (sans #!) if you don't feel like using TCC.
+// It is a very basic and portable C99 application.  It's not supposed to be
+// very sophisticated, for it'd get extremely big.
+//
+// The main influences of the language were Factor and Joy, stripped of all
+// even barely complex stuff.  In its current state, it's only really useful as
+// a calculator but it's got great potential for extending.
+//
+// If you don't like something, just change it; this is just an experiment.
+//
+// NOTE: it is really easy to crash and abuse.  Be careful.
+//
+
+#define _XOPEN_SOURCE 500
+
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <ctype.h>
+#include <errno.h>
+#include <stdarg.h>
+#include <assert.h>
+#include <time.h>
+#include <stdbool.h>
+#include <strings.h>
+
+#if defined __GNUC__
+#define ATTRIBUTE_PRINTF(x, y) __attribute__ ((format (printf, x, y)))
+#else // ! __GNUC__
+#define ATTRIBUTE_PRINTF(x, y)
+#endif // ! __GNUC__
+
+#define N_ELEMENTS(a) (sizeof (a) / sizeof ((a)[0]))
+
+// --- Utilities ---------------------------------------------------------------
+
+static char *strdup_printf (const char *format, ...) ATTRIBUTE_PRINTF (1, 2);
+
+static char *
+strdup_printf (const char *format, ...)
+{
+	va_list ap;
+	va_start (ap, format);
+	int size = vsnprintf (NULL, 0, format, ap);
+	va_end (ap);
+	if (size < 0)
+		return NULL;
+
+	char buf[size + 1];
+	va_start (ap, format);
+	size = vsnprintf (buf, sizeof buf, format, ap);
+	va_end (ap);
+	if (size < 0)
+		return NULL;
+
+	return strdup (buf);
+}
+
+// --- Generic buffer ----------------------------------------------------------
+
+struct buffer
+{
+	char *s;                            ///< Buffer data
+	size_t alloc;                       ///< Number of bytes allocated
+	size_t len;                         ///< Number of bytes used
+};
+
+#define BUFFER_INITIALIZER {NULL, 0, 0}
+
+static void
+buffer_append (struct buffer *self, const void *s, size_t n)
+{
+	if (!self->s)
+		self->s = malloc (self->alloc = 8);
+	while (self->len + n > self->alloc)
+		self->s = realloc (self->s, self->alloc <<= 1);
+
+	memcpy (self->s + self->len, s, n);
+	self->len += n;
+}
+
+inline static void
+buffer_append_c (struct buffer *self, char c)
+{
+	buffer_append (self, &c, 1);
+}
+
+// --- Data types --------------------------------------------------------------
+
+enum item_type
+{
+	ITEM_STRING,
+	ITEM_WORD,
+	ITEM_INTEGER,
+	ITEM_FLOAT,
+	ITEM_LIST
+};
+
+struct item
+{
+#define ITEM_HEADER                                                            \
+	enum item_type type;                /**< The type of this object        */ \
+	struct item *next;                  /**< Next item on the list/stack    */
+
+	ITEM_HEADER
+};
+
+struct item_string
+{
+	ITEM_HEADER
+	size_t len;                         ///< Length of the string (sans '\0')
+	char value[];                       ///< The null-terminated string value
+};
+
+#define get_string(item)                                                       \
+	(assert ((item)->type == ITEM_STRING),                                     \
+	 ((struct item_string *)(item))->value)
+
+/// It looks like a string but it doesn't quack like a string
+#define item_word item_string
+
+#define get_word(item)                                                         \
+	(assert ((item)->type == ITEM_WORD),                                       \
+	 ((struct item_word *)(item))->value)
+
+struct item_integer
+{
+	ITEM_HEADER
+	long long value;                    ///< The integer value
+};
+
+#define get_integer(item)                                                      \
+	(assert ((item)->type == ITEM_INTEGER),                                    \
+	 ((struct item_integer *)(item))->value)
+
+struct item_float
+{
+	ITEM_HEADER
+	long double value;                  ///< The floating point value
+};
+
+#define get_float(item)                                                        \
+	(assert ((item)->type == ITEM_FLOAT),                                      \
+	 ((struct item_float *)(item))->value)
+
+struct item_list
+{
+	ITEM_HEADER
+	struct item *head;                  ///< The head of the list
+};
+
+#define get_list(item)                                                         \
+	(assert ((item)->type == ITEM_LIST),                                       \
+	 ((struct item_list *)(item))->head)
+
+#define set_list(item, head_)                                                  \
+	(assert ((item)->type == ITEM_LIST),                                       \
+	 item_free_list (((struct item_list *)(item))->head),                      \
+	 ((struct item_list *)(item))->head = (head_))
+
+const char *
+item_type_to_str (enum item_type type)
+{
+	switch (type)
+	{
+	case ITEM_STRING:   return "string";
+	case ITEM_WORD:     return "word";
+	case ITEM_INTEGER:  return "integer";
+	case ITEM_FLOAT:    return "float";
+	case ITEM_LIST:     return "list";
+	}
+	abort ();
+}
+
+// --- Item management ---------------------------------------------------------
+
+static void item_free_list (struct item *);
+static struct item *new_clone_list (const struct item *);
+
+static void
+item_free (struct item *item)
+{
+	if (item->type == ITEM_LIST)
+		item_free_list (get_list (item));
+	free (item);
+}
+
+static void
+item_free_list (struct item *item)
+{
+	while (item)
+	{
+		struct item *link = item;
+		item = item->next;
+		item_free (link);
+	}
+}
+
+static struct item *
+new_clone (const struct item *item)
+{
+	size_t size;
+	switch (item->type)
+	{
+	case ITEM_STRING:
+	case ITEM_WORD:
+	{
+		const struct item_string *x = (const struct item_string *) item;
+		size = sizeof *x + x->len + 1;
+		break;
+	}
+	case ITEM_INTEGER:  size = sizeof (struct item_integer);  break;
+	case ITEM_FLOAT:    size = sizeof (struct item_float);    break;
+	case ITEM_LIST:     size = sizeof (struct item_list);     break;
+	}
+
+	struct item *clone = memcpy (malloc (size), item, size);
+	if (item->type == ITEM_LIST)
+	{
+		struct item_list *x = (struct item_list *) clone;
+		x->head = new_clone_list (x->head);
+	}
+	clone->next = NULL;
+	return clone;
+}
+
+static struct item *
+new_clone_list (const struct item *item)
+{
+	struct item *head = NULL;
+	for (struct item **out = &head; item; item = item->next)
+	{
+		struct item *clone = *out = new_clone (item);
+		clone->next = NULL;
+		out = &clone->next;
+	}
+	return head;
+}
+
+static struct item *
+new_string (const char *s, ssize_t len)
+{
+	if (len < 0)
+		len = strlen (s);
+
+	struct item_string *item = calloc (1, sizeof *item + len + 1);
+	if (!item)
+		return NULL;
+
+	item->type = ITEM_STRING;
+	item->len = len;
+	memcpy (item->value, s, len);
+	item->value[len] = '\0';
+	return (struct item *) item;
+}
+
+static struct item *
+new_word (const char *s, ssize_t len)
+{
+	struct item *item = new_string (s, len);
+	item->type = ITEM_WORD;
+	return item;
+}
+
+static struct item *
+new_integer (long long value)
+{
+	struct item_integer *item = calloc (1, sizeof *item);
+	item->type = ITEM_INTEGER;
+	item->value = value;
+	return (struct item *) item;
+}
+
+static struct item *
+new_float (long double value)
+{
+	struct item_float *item = calloc (1, sizeof *item);
+	item->type = ITEM_FLOAT;
+	item->value = value;
+	return (struct item *) item;
+}
+
+static struct item *
+new_list (struct item *head)
+{
+	struct item_list *item = calloc (1, sizeof *item);
+	item->type = ITEM_LIST;
+	item->head = head;
+	return (struct item *) item;
+}
+
+// --- Parsing -----------------------------------------------------------------
+
+struct tokenizer
+{
+	const char *cursor;
+	const char *error;
+};
+
+static bool
+decode_hexa_escape (struct tokenizer *self, struct buffer *buf)
+{
+	int i;
+	char c, code = 0;
+
+	for (i = 0; i < 2; i++)
+	{
+		c = tolower (*self->cursor);
+		if (c >= '0' && c <= '9')
+			code = (code << 4) | (c - '0');
+		else if (c >= 'a' && c <= 'f')
+			code = (code << 4) | (c - 'a' + 10);
+		else
+			break;
+
+		self->cursor++;
+	}
+
+	if (!i)
+		return false;
+
+	buffer_append_c (buf, code);
+	return true;
+}
+
+static bool
+decode_octal_escape (struct tokenizer *self, struct buffer *buf)
+{
+	int i;
+	char c, code = 0;
+
+	for (i = 0; i < 3; i++)
+	{
+		c = *self->cursor;
+		if (c < '0' || c > '7')
+			break;
+
+		code = (code << 3) | (c - '0');
+		self->cursor++;
+	}
+
+	if (!i)
+		return false;
+
+	buffer_append_c (buf, code);
+	return true;
+}
+
+static bool
+decode_escape_sequence (struct tokenizer *self, struct buffer *buf)
+{
+	// Support some basic escape sequences from the C language
+	char c;
+	switch ((c = *self->cursor))
+	{
+	case '\0':
+		self->error = "unexpected end of input";
+		return false;
+	case 'x':
+	case 'X':
+		self->cursor++;
+		if (decode_hexa_escape (self, buf))
+			return true;
+
+		self->error = "invalid hexadecimal escape sequence";
+		return false;
+	default:
+		if (decode_octal_escape (self, buf))
+			return true;
+
+		self->cursor++;
+		const char *from = "abfnrtv\"\\", *to = "\a\b\f\n\r\t\v\"\\", *x;
+		if ((x = strchr (from, c)))
+		{
+			buffer_append_c (buf, to[x - from]);
+			return true;
+		}
+
+		self->error = "unrecognized escape sequence";
+		return false;
+	}
+}
+
+static struct item *
+parse_string (struct tokenizer *self)
+{
+	struct buffer buf = BUFFER_INITIALIZER;
+	char c;
+
+	while (true)
+	switch ((c = *self->cursor++))
+	{
+	case '\0':
+		self->cursor--;
+		self->error = "unexpected end of input";
+		goto fail;
+	case '"':
+	{
+		struct item *item = new_string (buf.s, buf.len);
+		free (buf.s);
+		return item;
+	}
+	case '\\':
+		if (!decode_escape_sequence (self, &buf))
+			goto fail;
+		break;
+	default:
+		buffer_append_c (&buf, c);
+	}
+
+fail:
+	free (buf.s);
+	return NULL;
+}
+
+static struct item *
+try_parse_number (struct tokenizer *self)
+{
+	// These two standard library functions can digest a lot of various inputs,
+	// including NaN and +/- infinity.  That may get a bit confusing.
+	char *float_end;
+	errno = 0;
+	long double float_value = strtold (self->cursor, &float_end);
+	int float_errno = errno;
+
+	char *int_end;
+	errno = 0;
+	long long int_value = strtoll (self->cursor, &int_end, 10);
+	int int_errno = errno;
+
+	// If they both fail, then this is most probably not a number.
+	if (float_end == int_end && float_end == self->cursor)
+		return NULL;
+
+	// Only use the floating point result if it parses more characters:
+	if (float_end > int_end)
+	{
+		if (float_errno == ERANGE)
+		{
+			self->error = "floating point value out of range";
+			return NULL;
+		}
+		self->cursor = float_end;
+		return new_float (float_value);
+	}
+	else
+	{
+		if (int_errno == ERANGE)
+		{
+			self->error = "integer out of range";
+			return NULL;
+		}
+		self->cursor = int_end;
+		return new_integer (int_value);
+	}
+}
+
+static struct item *
+parse_word (struct tokenizer *self)
+{
+	struct buffer buf = BUFFER_INITIALIZER;
+	char c;
+
+	// Here we accept almost anything that doesn't break the grammar...
+	while (!strchr (" []\"", (c = *self->cursor++)) && (unsigned char) c > ' ')
+		buffer_append_c (&buf, c);
+	self->cursor--;
+
+	// ...so an empty word can only mean a bug within our caller.
+	assert (buf.len != 0);
+
+	struct item *item = new_word (buf.s, buf.len);
+	free (buf.s);
+	return item;
+}
+
+static struct item *parse_item_list (struct tokenizer *);
+
+static struct item *
+parse_list (struct tokenizer *self)
+{
+	struct item *list = parse_item_list (self);
+	if (self->error)
+	{
+		assert (list == NULL);
+		return NULL;
+	}
+	if (!*self->cursor)
+	{
+		self->error = "unexpected end of input";
+		item_free_list (list);
+		return NULL;
+	}
+	assert (*self->cursor == ']');
+	self->cursor++;
+	return new_list (list);
+}
+
+static struct item *
+parse_item (struct tokenizer *self)
+{
+	char c;
+	switch ((c = *self->cursor++))
+	{
+	case '[':  return parse_list (self);
+	case '"':  return parse_string (self);
+	default:;
+	}
+
+	self->cursor--;
+	struct item *item = try_parse_number (self);
+	if (!item && !self->error)
+		item = parse_word (self);
+	return item;
+}
+
+static struct item *
+parse_item_list (struct tokenizer *self)
+{
+	struct item *head = NULL;
+	struct item **tail = &head;
+
+	char c;
+	bool expected = true;
+	while ((c = *self->cursor) && c != ']')
+	{
+		if (isspace (c))
+		{
+			self->cursor++;
+			expected = true;
+			continue;
+		}
+		else if (!expected)
+		{
+			self->error = "unexpected input";
+			goto fail;
+		}
+
+		if (!(*tail = parse_item (self)))
+			goto fail;
+		tail = &(*tail)->next;
+		expected = false;
+	}
+	return head;
+
+fail:
+	item_free_list (head);
+	return NULL;
+}
+
+static struct item *
+parse (const char *s, char **error)
+{
+	struct tokenizer self;
+	self.cursor = s;
+	self.error = NULL;
+
+	struct item *list = parse_item_list (&self);
+	if (!self.error && *self.cursor != '\0')
+	{
+		self.error = "unexpected input";
+		item_free_list (list);
+		list = NULL;
+	}
+	if (self.error && error)
+		*error = strdup_printf ("at character %d: %s",
+			(int) (self.cursor - s) + 1, self.error);
+	return list;
+}
+
+// --- Runtime -----------------------------------------------------------------
+
+// TODO: try to think of a _simple_ way to do preemptive multitasking
+
+struct context
+{
+	struct item *stack;                 ///< The current top of the stack
+	size_t stack_size;                  ///< Number of items on the stack
+
+	size_t reduction_count;             ///< # of function calls so far
+	size_t reduction_limit;             ///< The hard limit on function calls
+
+	char *error;                        ///< Error information
+	bool error_is_fatal;                ///< Whether the error can be catched
+
+	void *user_data;                    ///< User data
+};
+
+/// Internal handler for a function
+typedef bool (*handler_fn) (struct context *);
+
+struct fn
+{
+	struct fn *next;                    ///< The next link in the chain
+
+	handler_fn handler;                 ///< Internal C handler, or NULL
+	struct item *script;                ///< Alternatively runtime code
+	char name[];                        ///< The name of the function
+};
+
+struct fn *g_functions;                 ///< Maps words to functions
+
+static void
+context_init (struct context *ctx)
+{
+	ctx->stack = NULL;
+	ctx->stack_size = 0;
+
+	ctx->reduction_count = 0;
+	ctx->reduction_limit = 2000;
+
+	ctx->error = NULL;
+	ctx->error_is_fatal = false;
+
+	ctx->user_data = NULL;
+}
+
+static void
+context_free (struct context *ctx)
+{
+	item_free_list (ctx->stack);
+	ctx->stack = NULL;
+
+	free (ctx->error);
+	ctx->error = NULL;
+}
+
+static void
+push (struct context *ctx, struct item *item)
+{
+	assert (item->next == NULL);
+	item->next = ctx->stack;
+	ctx->stack = item;
+	ctx->stack_size++;
+}
+
+static bool
+bump_reductions (struct context *ctx)
+{
+	if (++ctx->reduction_count >= ctx->reduction_limit)
+	{
+		ctx->error = strdup ("reduction limit reached");
+		ctx->error_is_fatal = true;
+		return false;
+	}
+	return true;
+}
+
+static bool execute (struct context *, struct item *);
+
+static bool
+call_function (struct context *ctx, const char *name)
+{
+	struct fn *iter;
+	for (iter = g_functions; iter; iter = iter->next)
+		if (!strcmp (name, iter->name))
+			goto found;
+
+	ctx->error = strdup_printf ("unknown function: %s", name);
+	return false;
+
+found:
+	if (!bump_reductions (ctx))
+		return false;
+
+	if (iter->handler
+		? iter->handler (ctx)
+		: execute (ctx, iter->script))
+		return true;
+
+	// This creates some form of a stack trace
+	char *error = strdup_printf ("%s -> %s", name, ctx->error);
+	free (ctx->error);
+	ctx->error = error;
+	return false;
+}
+
+static void
+unregister_function (const char *name)
+{
+	for (struct fn **iter = &g_functions; *iter; iter = &(*iter)->next)
+		if (!strcmp ((*iter)->name, name))
+		{
+			struct fn *tmp = *iter;
+			*iter = tmp->next;
+			if (tmp->script)
+				item_free_list (tmp->script);
+			free (tmp);
+			break;
+		}
+}
+
+static struct fn *
+prepend_new_fn (const char *name)
+{
+	struct fn *fn = calloc (1, sizeof *fn + strlen (name) + 1);
+	strcpy (fn->name, name);
+	fn->next = g_functions;
+	return g_functions = fn;
+}
+
+static void
+register_handler (const char *name, handler_fn handler)
+{
+	unregister_function (name);
+	prepend_new_fn (name)->handler = handler;
+}
+
+static void
+register_script (const char *name, struct item *script)
+{
+	unregister_function (name);
+	prepend_new_fn (name)->script = script;
+}
+
+static bool
+execute (struct context *ctx, struct item *script)
+{
+	for (; script; script = script->next)
+	{
+		if (script->type != ITEM_WORD)
+		{
+			if (!bump_reductions (ctx))
+				return false;
+			push (ctx, new_clone (script));
+		}
+		else if (!call_function (ctx, get_word (script)))
+			return false;
+	}
+	return true;
+}
+
+// --- Runtime library ---------------------------------------------------------
+
+#define defn(name) static bool name (struct context *ctx)
+
+#define check_stack(n)                                                         \
+	if (ctx->stack_size < n) {                                                 \
+		ctx->error = strdup ("stack underflow");                               \
+		return 0;                                                              \
+	}
+
+inline static bool
+check_stack_safe (struct context *ctx, size_t n)
+{
+	check_stack (n);
+	return true;
+}
+
+static bool
+check_type (struct context *ctx, const void *item_, enum item_type type)
+{
+	const struct item *item = item_;
+	if (item->type == type)
+		return true;
+
+	ctx->error = strdup_printf ("invalid type: expected `%s', got `%s'",
+		item_type_to_str (type), item_type_to_str (item->type));
+	return false;
+}
+
+static struct item *
+pop (struct context *ctx)
+{
+	check_stack (1);
+	struct item *top = ctx->stack;
+	ctx->stack = top->next;
+	top->next = NULL;
+	ctx->stack_size--;
+	return top;
+}
+
+// - - Types - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
+
+#define defn_is_type(name, item_type)                                          \
+	defn (fn_is_##name) {                                                      \
+		check_stack (1);                                                       \
+		struct item *top = pop (ctx);                                          \
+		push (ctx, new_integer (top->type == (item_type)));                    \
+		item_free (top);                                                       \
+		return true;                                                           \
+	}
+
+defn_is_type (string,  ITEM_STRING)
+defn_is_type (word,    ITEM_WORD)
+defn_is_type (integer, ITEM_INTEGER)
+defn_is_type (float,   ITEM_FLOAT)
+defn_is_type (list,    ITEM_LIST)
+
+defn (fn_to_string)
+{
+	check_stack (1);
+	struct item *item = pop (ctx);
+	char *value;
+
+	switch (item->type)
+	{
+	case ITEM_WORD:
+		item->type = ITEM_STRING;
+	case ITEM_STRING:
+		push (ctx, item);
+		return true;
+
+	case ITEM_FLOAT:
+		value = strdup_printf ("%Lf", get_float (item));
+		break;
+	case ITEM_INTEGER:
+		value = strdup_printf ("%lld", get_integer (item));
+		break;
+
+	default:
+		ctx->error = strdup_printf ("cannot convert `%s' to `%s'",
+			item_type_to_str (item->type), item_type_to_str (ITEM_STRING));
+		item_free (item);
+		return false;
+	}
+
+	item_free (item);
+	item = new_string (value, -1);
+	free (value);
+
+	push (ctx, item);
+	return true;
+}
+
+defn (fn_to_integer)
+{
+	check_stack (1);
+	struct item *item = pop (ctx);
+	long long value;
+
+	switch (item->type)
+	{
+	case ITEM_INTEGER:
+		push (ctx, item);
+		return true;
+	case ITEM_FLOAT:
+		value = get_float (item);
+		break;
+
+	case ITEM_STRING:
+	{
+		char *end;
+		const char *s = get_string (item);
+		value = strtoll (s, &end, 10);
+		if (end != s && *s == '\0')
+			break;
+
+		ctx->error = strdup ("integer conversion error");
+		item_free (item);
+		return false;
+	}
+
+	default:
+		ctx->error = strdup_printf ("cannot convert `%s' to `%s'",
+			item_type_to_str (item->type), item_type_to_str (ITEM_INTEGER));
+		item_free (item);
+		return false;
+	}
+
+	item_free (item);
+	push (ctx, new_integer (value));
+	return true;
+}
+
+defn (fn_to_float)
+{
+	check_stack (1);
+	struct item *item = pop (ctx);
+	long double value;
+
+	switch (item->type)
+	{
+	case ITEM_FLOAT:
+		push (ctx, item);
+		return true;
+	case ITEM_INTEGER:
+		value = get_integer (item);
+		break;
+
+	case ITEM_STRING:
+	{
+		char *end;
+		const char *s = get_string (item);
+		value = strtold (s, &end);
+		if (end != s && *s == '\0')
+			break;
+
+		ctx->error = strdup ("float conversion error");
+		item_free (item);
+		return false;
+	}
+
+	default:
+		ctx->error = strdup_printf ("cannot convert `%s' to `%s'",
+			item_type_to_str (item->type), item_type_to_str (ITEM_FLOAT));
+		item_free (item);
+		return false;
+	}
+
+	item_free (item);
+	push (ctx, new_float (value));
+	return true;
+}
+
+// - - Stack operations  - - - - - - - - - - - - - - - - - - - - - - - - - - - -
+
+defn (fn_dup)
+{
+	check_stack (1);
+	push (ctx, new_clone (ctx->stack));
+	return true;
+}
+
+defn (fn_drop)
+{
+	check_stack (1);
+	item_free (pop (ctx));
+	return true;
+}
+
+defn (fn_swap)
+{
+	check_stack (2);
+	struct item *first = pop (ctx);
+	struct item *second = pop (ctx);
+	push (ctx, first);
+	push (ctx, second);
+	return true;
+}
+
+defn (fn_call)
+{
+	check_stack (1);
+	struct item *item = pop (ctx);
+	bool success;
+	// XXX: this behaves differently from if/map/filter
+	if (item->type == ITEM_LIST)
+		success = execute (ctx, get_list (item));
+	else
+		success = execute (ctx, item);
+	item_free (item);
+	return success;
+}
+
+defn (fn_dip)
+{
+	check_stack (2);
+	struct item *item = pop (ctx);
+	if (!fn_call (ctx))
+	{
+		item_free (item);
+		return false;
+	}
+	push (ctx, item);
+	return true;
+}
+
+// - - Logical - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
+
+static bool
+to_boolean (struct context *ctx, struct item *item)
+{
+	switch (item->type)
+	{
+	case ITEM_STRING:
+		return *get_string (item) != '\0';
+	case ITEM_INTEGER:
+		return get_integer (item) != 0;
+	case ITEM_FLOAT:
+		return get_float   (item) != 0.;
+	default:
+		ctx->error = strdup_printf ("cannot convert `%s' to boolean",
+			item_type_to_str (item->type));
+		return false;
+	}
+}
+
+defn (fn_not)
+{
+	check_stack (1);
+	struct item *item = pop (ctx);
+	bool result = !to_boolean (ctx, item);
+	item_free (item);
+	if (ctx->error)
+		return false;
+	push (ctx, new_integer (result));
+	return true;
+}
+
+defn (fn_and)
+{
+	check_stack (2);
+	struct item *op1 = pop (ctx);
+	struct item *op2 = pop (ctx);
+	bool result = to_boolean (ctx, op1) && to_boolean (ctx, op2);
+	item_free (op1);
+	item_free (op2);
+	push (ctx, new_integer (result));
+	return !ctx->error;
+}
+
+defn (fn_or)
+{
+	check_stack (2);
+	struct item *op1 = pop (ctx);
+	struct item *op2 = pop (ctx);
+	bool result = to_boolean (ctx, op1) || ctx->error || to_boolean (ctx, op2);
+	item_free (op1);
+	item_free (op2);
+	if (ctx->error)
+		return false;
+	push (ctx, new_integer (result));
+	return true;
+}
+
+// - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
+
+defn (fn_if)
+{
+	check_stack (3);
+	struct item *else_ = pop (ctx);
+	struct item *then_ = pop (ctx);
+	struct item *cond_ = pop (ctx);
+
+	bool condition = to_boolean (ctx, cond_);
+	item_free (cond_);
+
+	bool success = false;
+	if (!ctx->error
+	 && check_type (ctx, then_, ITEM_LIST)
+	 && check_type (ctx, else_, ITEM_LIST))
+		success = execute (ctx, condition
+			? get_list (then_)
+			: get_list (else_));
+
+	item_free (then_);
+	item_free (else_);
+	return success;
+}
+
+defn (fn_try)
+{
+	check_stack (2);
+	struct item *catch   = pop (ctx);
+	struct item *try     = pop (ctx);
+	bool success = false;
+	if (!check_type (ctx, try,     ITEM_LIST)
+	 || !check_type (ctx, catch,   ITEM_LIST))
+	 goto fail;
+
+	if (!execute (ctx, get_list (try)))
+	{
+		if (ctx->error_is_fatal)
+			goto fail;
+
+		push (ctx, new_string (ctx->error, -1));
+		free (ctx->error);
+		ctx->error = NULL;
+
+		if (!execute (ctx, get_list (catch)))
+			goto fail;
+	}
+	success = true;
+
+fail:
+	item_free (try);
+	item_free (catch);
+	return success;
+}
+
+defn (fn_map)
+{
+	check_stack (2);
+	struct item *fn   = pop (ctx);
+	struct item *list = pop (ctx);
+	if (!check_type (ctx, fn,   ITEM_LIST)
+	 || !check_type (ctx, list, ITEM_LIST))
+	{
+		item_free (fn);
+		item_free (list);
+		return false;
+	}
+
+	bool success = false;
+	struct item *result = NULL, **tail = &result;
+	for (struct item *iter = get_list (list); iter; iter = iter->next)
+	{
+		push (ctx, new_clone (iter));
+		if (!execute (ctx, get_list (fn))
+		 || !check_stack_safe (ctx, 1))
+			goto fail;
+
+		struct item *item = pop (ctx);
+		*tail = item;
+		tail = &item->next;
+	}
+	success = true;
+
+fail:
+	set_list (list, result);
+	if (success)
+		push (ctx, list);
+	else
+		item_free (list);
+
+	item_free (fn);
+	return success;
+}
+
+defn (fn_filter)
+{
+	check_stack (2);
+	struct item *fn   = pop (ctx);
+	struct item *list = pop (ctx);
+	if (!check_type (ctx, fn,   ITEM_LIST)
+	 || !check_type (ctx, list, ITEM_LIST))
+	{
+		item_free (fn);
+		item_free (list);
+		return false;
+	}
+
+	bool success = false;
+	struct item *result = NULL, **tail = &result;
+	for (struct item *iter = get_list (list); iter; iter = iter->next)
+	{
+		push (ctx, new_clone (iter));
+		if (!execute (ctx, get_list (fn))
+		 || !check_stack_safe (ctx, 1))
+			goto fail;
+
+		struct item *item = pop (ctx);
+		bool survived = to_boolean (ctx, item);
+		item_free (item);
+		if (ctx->error)
+			goto fail;
+
+		if (!survived)
+			continue;
+
+		item = new_clone (iter);
+		*tail = item;
+		tail = &item->next;
+	}
+	success = true;
+
+fail:
+	set_list (list, result);
+	if (success)
+		push (ctx, list);
+	else
+		item_free (list);
+
+	item_free (fn);
+	return success;
+}
+
+// - - Arithmetic  - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
+
+// XXX: why not a `struct item_string *` argument?
+static bool
+push_repeated_string (struct context *ctx, struct item *op1, struct item *op2)
+{
+	struct item_string  *string = (struct item_string  *) op1;
+	struct item_integer *repeat = (struct item_integer *) op2;
+	assert (string->type == ITEM_STRING);
+	assert (repeat->type == ITEM_INTEGER);
+
+	if (repeat->value < 0)
+	{
+		ctx->error = strdup ("cannot multiply a string by a negative value");
+		return false;
+	}
+
+	char *buf = NULL;
+	size_t len = string->len * repeat->value;
+	if (len < string->len && repeat->value != 0)
+		goto allocation_fail;
+
+	buf = malloc (len);
+	if (!buf)
+		goto allocation_fail;
+
+	for (size_t i = 0; i < len; i += string->len)
+		memcpy (buf + i, string->value, string->len);
+	struct item *item = new_string (buf, len);
+	free (buf);
+	if (!item)
+		goto allocation_fail;
+
+	push (ctx, item);
+	return true;
+
+allocation_fail:
+	// TODO: resolve the memory issues correctly, watch _all_ allocations
+	ctx->error = strdup ("memory allocation failed");
+	return false;
+}
+
+defn (fn_times)
+{
+	check_stack (2);
+	struct item *op1 = pop (ctx);
+	struct item *op2 = pop (ctx);
+	bool success = true;
+
+	if      (op1->type == ITEM_INTEGER && op2->type == ITEM_INTEGER)
+		push (ctx, new_integer (get_integer (op1) * get_integer (op2)));
+	else if (op1->type == ITEM_INTEGER && op2->type == ITEM_FLOAT)
+		push (ctx, new_float   (get_integer (op1) * get_float   (op2)));
+	else if (op1->type == ITEM_FLOAT   && op2->type == ITEM_FLOAT)
+		push (ctx, new_float   (get_float   (op1) * get_float   (op2)));
+	else if (op1->type == ITEM_FLOAT   && op2->type == ITEM_INTEGER)
+		push (ctx, new_float   (get_float   (op1) * get_integer (op2)));
+	else if (op1->type == ITEM_INTEGER && op2->type == ITEM_STRING)
+		success = push_repeated_string (ctx, op2, op1);
+	else if (op1->type == ITEM_STRING  && op2->type == ITEM_INTEGER)
+		success = push_repeated_string (ctx, op1, op2);
+	else
+	{
+		ctx->error = strdup_printf ("cannot multiply `%s' and `%s'",
+			item_type_to_str (op1->type), item_type_to_str (op2->type));
+		success = false;
+	}
+
+	item_free (op1);
+	item_free (op2);
+	return success;
+}
+
+static bool
+push_concatenated_string (struct context *ctx,
+	struct item *op1, struct item *op2)
+{
+	struct item_string *s1 = (struct item_string *) op1;
+	struct item_string *s2 = (struct item_string *) op2;
+	assert (s1->type == ITEM_STRING);
+	assert (s2->type == ITEM_STRING);
+
+	char *buf = NULL;
+	size_t len = s1->len + s2->len;
+	if (len < s1->len || len < s2->len)
+		goto allocation_fail;
+
+	buf = malloc (len);
+	if (!buf)
+		goto allocation_fail;
+
+	memcpy (buf,           s1->value, s1->len);
+	memcpy (buf + s1->len, s2->value, s2->len);
+	struct item *item = new_string (buf, len);
+	free (buf);
+	if (!item)
+		goto allocation_fail;
+
+	push (ctx, item);
+	return true;
+
+allocation_fail:
+	// TODO: resolve the memory issues correctly, watch _all_ allocations
+	ctx->error = strdup ("memory allocation failed");
+	return false;
+
+}
+
+defn (fn_plus)
+{
+	check_stack (2);
+	struct item *op1 = pop (ctx);
+	struct item *op2 = pop (ctx);
+	bool success = true;
+
+	if      (op1->type == ITEM_INTEGER && op2->type == ITEM_INTEGER)
+		push (ctx, new_integer (get_integer (op1) + get_integer (op2)));
+	else if (op1->type == ITEM_INTEGER && op2->type == ITEM_FLOAT)
+		push (ctx, new_float   (get_integer (op1) + get_float   (op2)));
+	else if (op1->type == ITEM_FLOAT   && op2->type == ITEM_FLOAT)
+		push (ctx, new_float   (get_float   (op1) + get_float   (op2)));
+	else if (op1->type == ITEM_FLOAT   && op2->type == ITEM_INTEGER)
+		push (ctx, new_float   (get_float   (op1) + get_integer (op2)));
+	else if (op1->type == ITEM_STRING  && op2->type == ITEM_STRING)
+		success = push_concatenated_string (ctx, op2, op1);
+	else
+	{
+		ctx->error = strdup_printf ("cannot add `%s' and `%s'",
+			item_type_to_str (op1->type), item_type_to_str (op2->type));
+		success = false;
+	}
+
+	item_free (op1);
+	item_free (op2);
+	return success;
+}
+
+// - - Comparison  - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
+
+static int
+compare_strings (struct item_string *s1, struct item_string *s2)
+{
+	// XXX: not entirely correct wrt. null bytes
+	size_t len = (s1->len < s2->len ? s1->len : s2->len) + 1;
+	return memcmp (s1->value, s2->value, len);
+}
+
+static bool compare_lists (struct item *, struct item *);
+
+static bool
+compare_list_items (struct item *op1, struct item *op2)
+{
+	if (op1->type != op2->type)
+		return false;
+
+	switch (op1->type)
+	{
+	case ITEM_STRING:
+	case ITEM_WORD:
+		return !compare_strings ((struct item_string *) op1,
+			(struct item_string *) op2);
+	case ITEM_FLOAT:
+		return get_float (op1) == get_float (op2);
+	case ITEM_INTEGER:
+		return get_integer (op1) == get_integer (op2);
+	case ITEM_LIST:
+		return compare_lists (get_list (op1), get_list (op2));
+	}
+	abort ();
+}
+
+static bool
+compare_lists (struct item *op1, struct item *op2)
+{
+	while (op1 && op2)
+	{
+		if (!compare_list_items (op1, op2))
+			return false;
+
+		op1 = op1->next;
+		op2 = op2->next;
+	}
+	return !op1 && !op2;
+}
+
+defn (fn_eq)
+{
+	check_stack (2);
+	struct item *op2 = pop (ctx);
+	struct item *op1 = pop (ctx);
+	bool success = true;
+
+	if      (op1->type == ITEM_INTEGER && op2->type == ITEM_INTEGER)
+		push (ctx, new_integer (get_integer (op1) == get_integer (op2)));
+	else if (op1->type == ITEM_INTEGER && op2->type == ITEM_FLOAT)
+		push (ctx, new_integer (get_integer (op1) == get_float   (op2)));
+	else if (op1->type == ITEM_FLOAT   && op2->type == ITEM_FLOAT)
+		push (ctx, new_integer (get_float   (op1) == get_float   (op2)));
+	else if (op1->type == ITEM_FLOAT   && op2->type == ITEM_INTEGER)
+		push (ctx, new_integer (get_float   (op1) == get_integer (op2)));
+	else if (op1->type == ITEM_LIST    && op2->type == ITEM_LIST)
+		push (ctx, new_integer (compare_lists
+			(get_list (op1), get_list (op2))));
+	else if (op1->type == ITEM_STRING  && op2->type == ITEM_STRING)
+		push (ctx, new_integer (compare_strings
+			((struct item_string *)(op1), (struct item_string *)(op2)) == 0));
+	else
+	{
+		ctx->error = strdup_printf ("cannot compare `%s' and `%s'",
+			item_type_to_str (op1->type), item_type_to_str (op2->type));
+		success = false;
+	}
+
+	item_free (op1);
+	item_free (op2);
+	return success;
+}
+
+defn (fn_lt)
+{
+	check_stack (2);
+	struct item *op2 = pop (ctx);
+	struct item *op1 = pop (ctx);
+	bool success = true;
+
+	if      (op1->type == ITEM_INTEGER && op2->type == ITEM_INTEGER)
+		push (ctx, new_integer (get_integer (op1) < get_integer (op2)));
+	else if (op1->type == ITEM_INTEGER && op2->type == ITEM_FLOAT)
+		push (ctx, new_integer (get_integer (op1) < get_float   (op2)));
+	else if (op1->type == ITEM_FLOAT   && op2->type == ITEM_FLOAT)
+		push (ctx, new_integer (get_float   (op1) < get_float   (op2)));
+	else if (op1->type == ITEM_FLOAT   && op2->type == ITEM_INTEGER)
+		push (ctx, new_integer (get_float   (op1) < get_integer (op2)));
+	else if (op1->type == ITEM_STRING  && op2->type == ITEM_STRING)
+		push (ctx, new_integer (compare_strings
+			((struct item_string *)(op1), (struct item_string *)(op2)) < 0));
+	else
+	{
+		ctx->error = strdup_printf ("cannot compare `%s' and `%s'",
+			item_type_to_str (op1->type), item_type_to_str (op2->type));
+		success = false;
+	}
+
+	item_free (op1);
+	item_free (op2);
+	return success;
+}
+
+// - - Utilities - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
+
+defn (fn_rand)
+{
+	push (ctx, new_float ((long double) rand ()
+		/ ((long double) RAND_MAX + 1)));
+	return true;
+}
+
+defn (fn_time)
+{
+	push (ctx, new_integer (time (NULL)));
+	return true;
+}
+
+// XXX: this is a bit too constrained; combines strftime() with gmtime()
+defn (fn_strftime)
+{
+	check_stack (2);
+	struct item *format = pop (ctx);
+	struct item *time_  = pop (ctx);
+	bool success = false;
+	if (!check_type (ctx, time_,  ITEM_INTEGER)
+	 || !check_type (ctx, format, ITEM_STRING))
+		goto fail;
+
+	if (get_integer (time_) < 0)
+	{
+		ctx->error = strdup ("invalid time value");
+		goto fail;
+	}
+
+	char buf[128];
+	time_t time__ = get_integer (time_);
+	struct tm tm;
+	gmtime_r (&time__, &tm);
+	buf[strftime (buf, sizeof buf, get_string (format), &tm)] = '\0';
+	push (ctx, new_string (buf, -1));
+	success = true;
+
+fail:
+	item_free (time_);
+	item_free (format);
+	return success;
+}
+
+// - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
+
+static void item_list_to_str (const struct item *, struct buffer *);
+
+static void
+string_to_str (const struct item_string *string, struct buffer *buf)
+{
+	buffer_append_c (buf, '"');
+	for (size_t i = 0; i < string->len; i++)
+	{
+		char c = string->value[i];
+		if      (c == '\n')  buffer_append (buf, "\\\n", 2);
+		else if (c == '\r')  buffer_append (buf, "\\\r", 2);
+		else if (c == '\t')  buffer_append (buf, "\\\t", 2);
+		else if (!isprint (c))
+		{
+			char tmp[8];
+			snprintf (tmp, sizeof tmp, "\\x%02x", (unsigned char) c);
+			buffer_append (buf, tmp, strlen (tmp));
+		}
+		else if (c == '\\')  buffer_append (buf, "\\\\", 2);
+		else if (c == '"')   buffer_append (buf, "\\\"", 2);
+		else                 buffer_append_c (buf, c);
+	}
+	buffer_append_c (buf, '"');
+}
+
+static void
+item_to_str (const struct item *item, struct buffer *buf)
+{
+	switch (item->type)
+	{
+		char *x;
+	case ITEM_STRING:
+		string_to_str ((struct item_string *) item, buf);
+		break;
+	case ITEM_WORD:
+	{
+		struct item_word *word = (struct item_word *) item;
+		buffer_append (buf, word->value, word->len);
+		break;
+	}
+	case ITEM_INTEGER:
+		x = strdup_printf ("%lld", get_integer (item));
+		buffer_append (buf, x, strlen (x));
+		free (x);
+		break;
+	case ITEM_FLOAT:
+		x = strdup_printf ("%Lf", get_float (item));
+		buffer_append (buf, x, strlen (x));
+		free (x);
+		break;
+	case ITEM_LIST:
+		buffer_append_c (buf, '[');
+		item_list_to_str (get_list (item), buf);
+		buffer_append_c (buf, ']');
+		break;
+	}
+}
+
+static void
+item_list_to_str (const struct item *script, struct buffer *buf)
+{
+	bool first = true;
+	for (; script; script = script->next)
+	{
+		if (!first)
+			buffer_append_c (buf, ' ');
+		item_to_str (script, buf);
+		first = false;
+	}
+}
+
+// - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
+
+// TODO: implement more functions; try to avoid writing it in C
+//
+//   ? fold
+//   join { list delim -- string } -- string join -> script this
+//
+//   concat { list list -- list } -- join two lists
+//   -, /, %, ** -- arithmetic
+//   >, !=, <=, >= -- comparison
+//   first -- first character of a string, first element in a list
+//   rest -- [1:] of a string, the "tail" in a list
+//   at { value index -- sub-value } -- get n-th subvalue of a string/list
+//   cons { item value } -- prepend an item to the list/string
+//   <each> step { value program } -- foreach
+
+static void
+init_runtime_library (void)
+{
+	// Type detection
+	register_handler ("string?",  fn_is_string);
+	register_handler ("word?",    fn_is_word);
+	register_handler ("integer?", fn_is_integer);
+	register_handler ("float?",   fn_is_float);
+	register_handler ("list?",    fn_is_list);
+
+	// Type conversion
+	register_handler (">string",  fn_to_string);
+	register_handler (">integer", fn_to_integer);
+	register_handler (">float",   fn_to_float);
+
+	// Basic stack manipulation
+	register_handler ("dup",      fn_dup);
+	register_handler ("drop",     fn_drop);
+	register_handler ("swap",     fn_swap);
+
+	// Calling stuff
+	register_handler ("call",     fn_call);
+	register_handler ("dip",      fn_dip);
+
+	// Control flow
+	register_handler ("if",       fn_if);
+	register_handler ("try",      fn_try);
+
+	// List processing
+	register_handler ("map",      fn_map);
+	register_handler ("filter",   fn_filter);
+
+	// Arithmetic operations
+	register_handler ("*",        fn_times);
+	register_handler ("+",        fn_plus);
+
+	// Comparison
+	register_handler ("=",        fn_eq);
+	register_handler ("<",        fn_lt);
+
+	// Logical operations
+	register_handler ("not",      fn_not);
+	register_handler ("and",      fn_and);
+	register_handler ("or",       fn_or);
+
+	// Utilities
+	register_handler ("rand",     fn_rand);
+	register_handler ("time",     fn_time);
+	register_handler ("strftime", fn_strftime);
+}
+
+// --- IRC protocol ------------------------------------------------------------
+
+struct message
+{
+	char *prefix;                       ///< Message prefix
+	char *command;                      ///< IRC command
+	char *params[16];                   ///< Command parameters (0-terminated)
+	size_t n_params;                    ///< Number of parameters present
+};
+
+inline static char *
+cut_word (char **s)
+{
+	char *start = *s, *end = *s + strcspn (*s, " ");
+	*s = end + strspn (end, " ");
+	*end = '\0';
+	return start;
+}
+
+static bool
+parse_message (char *s, struct message *msg)
+{
+	memset (msg, 0, sizeof *msg);
+
+	// Ignore IRC 3.2 message tags, if present
+	if (*s == '@')
+	{
+		s += strcspn (s, " ");
+		s += strspn (s, " ");
+	}
+
+	// Prefix
+	if (*s == ':')
+		msg->prefix = cut_word (&s) + 1;
+
+	// Command
+	if (!*(msg->command = cut_word (&s)))
+		return false;
+
+	// Parameters
+	while (*s)
+	{
+		size_t n = msg->n_params++;
+		if (msg->n_params >= N_ELEMENTS (msg->params))
+			return false;
+		if (*s == ':')
+		{
+			msg->params[n] = ++s;
+			break;
+		}
+		msg->params[n] = cut_word (&s);
+	}
+	return true;
+}
+
+static struct message *
+read_message (void)
+{
+	static bool discard = false;
+	static char buf[1025];
+	static struct message msg;
+
+	bool discard_this;
+	do
+	{
+		if (!fgets (buf, sizeof buf, stdin))
+			exit (EXIT_SUCCESS);
+		size_t len = strlen (buf);
+
+		// Just to be on the safe side, if the line overflows our buffer,
+		// ignore everything up until the next line.
+		discard_this = discard;
+		if (len >= 2 && !strcmp (buf + len - 2, "\r\n"))
+		{
+			buf[len -= 2] = '\0';
+			discard = false;
+		}
+		else
+			discard = true;
+	}
+	// Invalid messages are silently ignored
+	while (discard_this || !parse_message (buf, &msg));
+	return &msg;
+}
+
+// --- Interfacing with the bot ------------------------------------------------
+
+#define BOT_PRINT "ZYKLONB print :script: "
+
+static const char *
+get_config (const char *key)
+{
+	printf ("ZYKLONB get_config :%s\r\n", key);
+	struct message *msg = read_message ();
+	if (msg->n_params <= 0)
+		exit (EXIT_FAILURE);
+	return msg->params[0];
+}
+
+// --- Function database -------------------------------------------------------
+
+// TODO: a global variable storing the various procedures (db)
+// XXX: defining procedures would ideally need some kind of an ACL
+
+static void
+read_db (void)
+{
+	// TODO
+}
+
+static void
+write_db (void)
+{
+	// TODO
+}
+
+// --- Main --------------------------------------------------------------------
+
+static char *g_prefix;
+
+struct user_info
+{
+	char *ctx;                          ///< Context: channel or user
+	char *ctx_quote;                    ///< Reply quotation
+};
+
+defn (fn_dot)
+{
+	check_stack (1);
+	struct item *item = pop (ctx);
+	struct user_info *info = ctx->user_data;
+
+	struct buffer buf = BUFFER_INITIALIZER;
+	item_to_str (item, &buf);
+	item_free (item);
+	buffer_append_c (&buf, '\0');
+	printf ("PRIVMSG %s :%s%s\r\n", info->ctx, info->ctx_quote, buf.s);
+	free (buf.s);
+	return true;
+}
+
+static void
+process_message (struct message *msg)
+{
+	if (strcasecmp (msg->command, "PRIVMSG") || msg->n_params < 2)
+		return;
+	char *line = msg->params[1];
+
+	// Filter out only our commands
+	size_t prefix_len = strlen (g_prefix);
+	if (strncmp (line, g_prefix, prefix_len))
+		return;
+	line += prefix_len;
+
+	char *command = cut_word (&line);
+	if (strcasecmp (command, "script"))
+		return;
+
+	// Retrieve information on how to respond back
+	char *msg_ctx = msg->prefix, *x;
+	if ((x = strchr (msg_ctx, '!')))
+		*x = '\0';
+
+	char *msg_ctx_quote;
+	if (strchr ("#+&!", *msg->params[0]))
+	{
+		msg_ctx_quote = strdup_printf ("%s: ", msg_ctx);
+		msg_ctx = msg->params[0];
+	}
+	else
+		msg_ctx_quote = strdup ("");
+
+	struct user_info info;
+	info.ctx = msg_ctx;
+	info.ctx_quote = msg_ctx_quote;
+
+	// Finally parse and execute the macro
+	char *error = NULL;
+	struct item *script = parse (line, &error);
+	if (error)
+	{
+		printf ("PRIVMSG %s :%s%s: %s\r\n",
+			msg_ctx, msg_ctx_quote, "parse error", error);
+		free (error);
+		goto end;
+	}
+
+	struct context ctx;
+	context_init (&ctx);
+	ctx.user_data = &info;
+	execute (&ctx, script);
+	item_free_list (script);
+	if (ctx.error)
+		printf ("PRIVMSG %s :%s%s: %s\r\n",
+			msg_ctx, msg_ctx_quote, "runtime error", ctx.error);
+	context_free (&ctx);
+end:
+	free (msg_ctx_quote);
+}
+
+int
+main (int argc, char *argv[])
+{
+	freopen (NULL, "rb", stdin);   setvbuf (stdin,  NULL, _IOLBF, BUFSIZ);
+	freopen (NULL, "wb", stdout);  setvbuf (stdout, NULL, _IOLBF, BUFSIZ);
+
+	read_db ();
+	init_runtime_library ();
+	register_handler (".", fn_dot);
+
+	g_prefix = strdup (get_config ("prefix"));
+	printf ("ZYKLONB register\r\n");
+	while (true)
+	{
+		struct message *msg = read_message ();
+		process_message (msg);
+	}
+	return 0;
+}
+