diff -r 62f1a55535e7 -r 0b33b9396851 ucx/ucx/list.h
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/ucx/ucx/list.h	Mon Feb 04 17:49:50 2019 +0100
@@ -0,0 +1,396 @@
+/*
+ * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS HEADER.
+ *
+ * Copyright 2017 Mike Becker, Olaf Wintermann All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are met:
+ *
+ *   1. Redistributions of source code must retain the above copyright
+ *      notice, this list of conditions and the following disclaimer.
+ *
+ *   2. Redistributions in binary form must reproduce the above copyright
+ *      notice, this list of conditions and the following disclaimer in the
+ *      documentation and/or other materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+ * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
+ * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+ * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
+ * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+ * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+ * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+ * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+ * POSSIBILITY OF SUCH DAMAGE.
+ */
+/**
+ * Doubly linked list implementation.
+ * 
+ * @file   list.h
+ * @author Mike Becker
+ * @author Olaf Wintermann
+ */
+
+#ifndef UCX_LIST_H
+#define	UCX_LIST_H
+
+#include "ucx.h"
+#include "allocator.h"
+
+#ifdef	__cplusplus
+extern "C" {
+#endif
+
+/**
+ * Loop statement for UCX lists.
+ * 
+ * The first argument is the name of the iteration variable. The scope of
+ * this variable is limited to the <code>UCX_FOREACH</code> statement.
+ * 
+ * The second argument is a pointer to the list. In most cases this will be the
+ * pointer to the first element of the list, but it may also be an arbitrary
+ * element of the list. The iteration will then start with that element.
+ * 
+ * @param list The first element of the list
+ * @param elem The variable name of the element
+ */
+#define UCX_FOREACH(elem,list) \
+        for (UcxList* elem = list ; elem != NULL ; elem = elem->next)
+
+/**
+ * UCX list type.
+ * @see UcxList
+ */
+typedef struct UcxList UcxList;
+
+/**
+ * UCX list structure.
+ */
+struct UcxList {
+    /**
+     * List element payload.
+     */
+    void    *data;
+    /**
+     * Pointer to the next list element or <code>NULL</code>, if this is the
+     * last element.
+     */
+    UcxList *next;
+    /**
+     * Pointer to the previous list element or <code>NULL</code>, if this is
+     * the first element.
+     */
+    UcxList *prev;
+};
+
+/**
+ * Creates an element-wise copy of a list.
+ * 
+ * This function clones the specified list by creating new list elements and
+ * copying the data with the specified copy_func(). If no copy_func() is
+ * specified, a shallow copy is created and the new list will reference the
+ * same data as the source list.
+ * 
+ * @param list the list to copy
+ * @param cpyfnc a pointer to the function that shall copy an element (may be
+ * <code>NULL</code>)
+ * @param data additional data for the copy_func()
+ * @return a pointer to the copy
+ */
+UcxList *ucx_list_clone(UcxList *list, copy_func cpyfnc, void* data);
+
+/**
+ * Creates an element-wise copy of a list using a UcxAllocator.
+ * 
+ * See ucx_list_clone() for details.
+ * 
+ * You might want to pass the allocator via the <code>data</code> parameter,
+ * to access it within the copy function for making deep copies.
+ * 
+ * @param allocator the allocator to use
+ * @param list the list to copy
+ * @param cpyfnc a pointer to the function that shall copy an element (may be
+ * <code>NULL</code>)
+ * @param data additional data for the copy_func()
+ * @return a pointer to the copy
+ * @see ucx_list_clone()
+ */
+UcxList *ucx_list_clone_a(UcxAllocator *allocator, UcxList *list,
+        copy_func cpyfnc, void* data);
+
+/**
+ * Compares two UCX lists element-wise by using a compare function.
+ * 
+ * Each element of the two specified lists are compared by using the specified
+ * compare function and the additional data. The type and content of this
+ * additional data depends on the cmp_func() used.
+ * 
+ * If the list pointers denote elements within a list, the lists are compared
+ * starting with the denoted elements. Thus any previous elements are not taken
+ * into account. This might be useful to check, if certain list tails match
+ * each other.
+ * 
+ * @param list1 the first list
+ * @param list2 the second list
+ * @param cmpfnc the compare function
+ * @param data additional data for the compare function
+ * @return 1, if and only if the two lists equal element-wise, 0 otherwise
+ */
+int ucx_list_equals(const UcxList *list1, const UcxList *list2,
+        cmp_func cmpfnc, void* data);
+
+/**
+ * Destroys the entire list.
+ * 
+ * The members of the list are not automatically freed, so ensure they are
+ * otherwise referenced or destroyed by ucx_list_free_contents().
+ * Otherwise, a memory leak is likely to occur.
+ * 
+ * <b>Caution:</b> the argument <b>MUST</b> denote an entire list (i.e. a call
+ * to ucx_list_first() on the argument must return the argument itself)
+ * 
+ * @param list the list to free
+ * @see ucx_list_free_contents()
+ */
+void ucx_list_free(UcxList *list);
+
+/**
+ * Destroys the entire list using a UcxAllocator.
+ * 
+ * See ucx_list_free() for details.
+ * 
+ * @param allocator the allocator to use
+ * @param list the list to free
+ * @see ucx_list_free()
+ */
+void ucx_list_free_a(UcxAllocator *allocator, UcxList *list);
+
+/**
+ * Destroys the contents of the specified list by calling the specified
+ * destructor on each of them.
+ * 
+ * Note, that the contents are not usable afterwards and the list should be
+ * destroyed with ucx_list_free().
+ *
+ * If no destructor is specified (<code>NULL</code>), stdlib's free() is used.
+ * 
+ * @param list the list for which the contents shall be freed
+ * @param destr optional destructor function
+ * @see ucx_list_free()
+ */
+void ucx_list_free_content(UcxList* list, ucx_destructor destr);
+
+
+/**
+ * Inserts an element at the end of the list.
+ * 
+ * This is generally an O(n) operation, as the end of the list is retrieved with
+ * ucx_list_last().
+ * 
+ * @param list the list where to append the data, or <code>NULL</code> to
+ * create a new list
+ * @param data the data to insert
+ * @return <code>list</code>, if it is not <code>NULL</code> or a pointer to
+ * the newly created list otherwise
+ */
+UcxList *ucx_list_append(UcxList *list, void *data);
+
+/**
+ * Inserts an element at the end of the list using a UcxAllocator.
+ * 
+ * See ucx_list_append() for details.
+ * 
+ * @param allocator the allocator to use
+ * @param list the list where to append the data, or <code>NULL</code> to
+ * create a new list
+ * @param data the data to insert
+ * @return <code>list</code>, if it is not <code>NULL</code> or a pointer to
+ * the newly created list otherwise
+ * @see ucx_list_append()
+ */
+UcxList *ucx_list_append_a(UcxAllocator *allocator, UcxList *list, void *data);
+
+
+/**
+ * Inserts an element at the beginning of the list.
+ * 
+ * You <i>should</i> overwrite the old list pointer by calling
+ * <code>mylist = ucx_list_prepend(mylist, mydata);</code>. However, you may
+ * also perform successive calls of ucx_list_prepend() on the same list pointer,
+ * as this function always searchs for the head of the list with
+ * ucx_list_first().
+ * 
+ * @param list the list where to insert the data or <code>NULL</code> to create
+ * a new list
+ * @param data the data to insert
+ * @return a pointer to the new list head
+ */
+UcxList *ucx_list_prepend(UcxList *list, void *data);
+
+/**
+ * Inserts an element at the beginning of the list using a UcxAllocator.
+ * 
+ * See ucx_list_prepend() for details.
+ * 
+ * @param allocator the allocator to use
+ * @param list the list where to insert the data or <code>NULL</code> to create
+ * a new list
+ * @param data the data to insert
+ * @return a pointer to the new list head
+ * @see ucx_list_prepend()
+ */
+UcxList *ucx_list_prepend_a(UcxAllocator *allocator, UcxList *list, void *data);
+
+/**
+ * Concatenates two lists.
+ * 
+ * Either of the two arguments may be <code>NULL</code>.
+ * 
+ * This function modifies the references to the next/previous element of
+ * the last/first element of <code>list1</code>/<code>
+ * list2</code>.
+ * 
+ * @param list1 first list
+ * @param list2 second list
+ * @return if <code>list1</code> is <code>NULL</code>, <code>list2</code> is
+ * returned, otherwise <code>list1</code> is returned
+ */
+UcxList *ucx_list_concat(UcxList *list1, UcxList *list2);
+
+/**
+ * Returns the first element of a list.
+ * 
+ * If the argument is the list pointer, it is directly returned. Otherwise
+ * this function traverses to the first element of the list and returns the
+ * list pointer.
+ * 
+ * @param elem one element of the list
+ * @return the first element of the list, the specified element is a member of
+ */
+UcxList *ucx_list_first(const UcxList *elem);
+
+/**
+ * Returns the last element of a list.
+ * 
+ * If the argument has no successor, it is the last element and therefore
+ * directly returned. Otherwise this function traverses to the last element of
+ * the list and returns it.
+ * 
+ * @param elem one element of the list
+ * @return the last element of the list, the specified element is a member of
+ */
+UcxList *ucx_list_last(const UcxList *elem);
+
+/**
+ * Returns the list element at the specified index.
+ * 
+ * @param list the list to retrieve the element from
+ * @param index index of the element to return
+ * @return the element at the specified index or <code>NULL</code>, if the
+ * index is greater than the list size
+ */
+UcxList *ucx_list_get(const UcxList *list, size_t index);
+
+/**
+ * Returns the index of an element.
+ * 
+ * @param list the list where to search for the element
+ * @param elem the element to find
+ * @return the index of the element or -1 if the list does not contain the
+ * element
+ */
+ssize_t ucx_list_indexof(const UcxList *list, const UcxList *elem);
+
+/**
+ * Returns the element count of the list.
+ * 
+ * @param list the list whose elements are counted
+ * @return the element count
+ */
+size_t ucx_list_size(const UcxList *list);
+
+/**
+ * Returns the index of an element containing the specified data.
+ *
+ * This function uses a cmp_func() to compare the data of each list element
+ * with the specified data. If no cmp_func is provided, the pointers are
+ * compared.
+ * 
+ * If the list contains the data more than once, the index of the first
+ * occurrence is returned.
+ *  
+ * @param list the list where to search for the data
+ * @param elem the element data
+ * @param cmpfnc the compare function
+ * @param data additional data for the compare function
+ * @return the index of the element containing the specified data or -1 if the
+ * data is not found in this list
+ */
+ssize_t ucx_list_find(UcxList *list, void *elem, cmp_func cmpfnc, void *data);
+
+/**
+ * Checks, if a list contains a specific element.
+ * 
+ * An element is found, if ucx_list_find() returns a value greater than -1.
+ * 
+ * @param list the list where to search for the data
+ * @param elem the element data
+ * @param cmpfnc the compare function
+ * @param data additional data for the compare function
+ * @return 1, if and only if the list contains the specified element data
+ * @see ucx_list_find()
+ */
+int ucx_list_contains(UcxList *list, void *elem, cmp_func cmpfnc, void *data);
+
+/**
+ * Sorts a UcxList with natural merge sort.
+ * 
+ * This function uses O(n) additional temporary memory for merge operations
+ * that is automatically freed after each merge.
+ * 
+ * As the head of the list might change, you <b>MUST</b> call this function
+ * as follows: <code>mylist = ucx_list_sort(mylist, mycmpfnc, mydata);</code>.
+ * 
+ * @param list the list to sort
+ * @param cmpfnc the function that shall be used to compare the element data
+ * @param data additional data for the cmp_func()
+ * @return the sorted list
+ */
+UcxList *ucx_list_sort(UcxList *list, cmp_func cmpfnc, void *data);
+
+/**
+ * Removes an element from the list.
+ * 
+ * If the first element is removed, the list pointer changes. So it is
+ * <i>highly recommended</i> to <i>always</i> update the pointer by calling
+ * <code>mylist = ucx_list_remove(mylist, myelem);</code>.
+ * 
+ * @param list the list from which the element shall be removed
+ * @param element the element to remove
+ * @return returns the updated list pointer or <code>NULL</code>, if the list
+ * is now empty
+ */
+UcxList *ucx_list_remove(UcxList *list, UcxList *element);
+
+/**
+ * Removes an element from the list using a UcxAllocator.
+ * 
+ * See ucx_list_remove() for details.
+ * 
+ * @param allocator the allocator to use
+ * @param list the list from which the element shall be removed
+ * @param element the element to remove
+ * @return returns the updated list pointer or <code>NULL</code>, if the list
+ * @see ucx_list_remove()
+ */
+UcxList *ucx_list_remove_a(UcxAllocator *allocator, UcxList *list,
+        UcxList *element);
+
+#ifdef	__cplusplus
+}
+#endif
+
+#endif	/* UCX_LIST_H */
+