Adding dynamic array datastructure.

array.c

@@ -0,0 +1,148 @@
+/* array.c
+ *
+ *   Copyright (C) 2010, 2012  Henrik Hautakoski <henrik@fiktivkod.org>
+ *
+ *   This program is free software; you can redistribute it and/or modify
+ *   it under the terms of the GNU General Public License as published by
+ *   the Free Software Foundation; either version 2 of the License, or
+ *   (at your option) any later version.
+ */
+
+#include <stdlib.h>
+#include <string.h>
+#include "xalloc.h"
+#include "array.h"
+
+struct __array {
+	void	*items;
+	unsigned nr;
+};
+
+static void resize(struct __array *arr, unsigned n) {
+
+	if (!arr->nr) {
+		xfree(arr->items);
+		arr->items = NULL;
+		return;
+	}
+	arr->items = xrealloc(arr->items, n * arr->nr);
+}
+
+void* array_create(void) {
+
+	struct __array *arr = xmalloc(sizeof(struct __array));
+	arr->items = NULL;
+	arr->nr = 0;
+	return arr;
+}
+
+void* __array_copy(void *__arr, unsigned n) {
+
+	struct __array *arr = __arr, *copy;
+
+	if (arr && arr->nr && n) {
+		copy = xmalloc(sizeof(*arr));
+		copy->items = xmemdup(arr->items, n * arr->nr);
+		copy->nr = arr->nr;
+		return copy;
+	}
+	return NULL;
+}
+
+int array_destroy(void *arr) {
+
+	array_clear(arr);
+	xfree(arr);
+	return 0;
+}
+
+void __array_clear_fn(void *__arr, array_clear_fn_t *fn,
+		unsigned n) {
+
+	struct __array *arr = __arr;
+
+	if (arr->items) {
+		if (fn) {
+			int i;
+			for(i=0; i < arr->nr; i++)
+				fn(arr->items + (i * n));
+		}
+		xfree(arr->items);
+	}
+	arr->items = NULL;
+	arr->nr = 0;
+}
+
+int __array_insert(void *__arr, const void *item, unsigned n) {
+
+	struct __array *arr = __arr;
+	if (arr) {
+		arr->items = xrealloc(arr->items, n * (++arr->nr));
+		memcpy(arr->items + ((arr->nr - 1) * n), item, n);
+		return arr->nr;
+	}
+	return -1;
+}
+
+void* __array_remove(void *__arr, unsigned i, unsigned n) {
+
+	struct __array *arr = __arr;
+	void *item = NULL;
+
+	if (i < arr->nr) {
+		/* I bet this will come back and bite me in the ass. */
+		item = arr->items + (i * n);
+		if (i < --arr->nr) {
+			memmove(arr->items + (i * n),
+			arr->items + ((i + 1) * n),
+			(arr->nr - i) * n);
+		}
+		resize(arr, n);
+	}
+	return item;
+}
+
+void* __array_reduce(void *__arr, unsigned n) {
+
+	struct __array *arr = __arr;
+	void *item = NULL;
+
+	if (arr->nr) {
+		item = arr->items + ((--arr->nr) * n);
+		resize(arr, n);
+	}
+	return item;
+}
+
+int __array_indexof(void *__arr, const void *item, unsigned n) {
+
+	int i;
+	struct __array *arr = __arr;
+
+	for(i=0; i < arr->nr; i++) {
+
+		if (!memcmp(arr->items + (i * n), item, n))
+			return i;
+	}
+	return -1;
+}
+
+void* __array_lookup(void *__arr, const void *item,
+		array_cmp_fn_t fn, unsigned n) {
+
+	int i;
+	struct __array *arr = __arr;
+
+	if (fn) {
+		for(i=0; i < arr->nr; i++) {
+			void *cmp = arr->items + (i * n);
+			if (fn(cmp, item) == 0)
+				return cmp;
+		}
+	} else {
+		i = __array_indexof(arr, item, n);
+		if (i >= 0)
+			return arr->items + (i * n);
+	}
+	return NULL;
+}