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+/*****************************************************************************
+ *  $Id: list.h 2899 2002-12-11 19:00:36Z dun $
+ *****************************************************************************
+ *  Copyright (C) 2001-2002 The Regents of the University of California.
+ *  Produced at Lawrence Livermore National Laboratory (cf, DISCLAIMER).
+ *  Written by Chris Dunlap <[email protected]>.
+ *  
+ *  This file is from LSD-Tools, the LLNL Software Development Toolbox.
+ *
+ *  LSD-Tools 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.
+ *
+ *  LSD-Tools is distributed in the hope that it will be useful, but WITHOUT
+ *  ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ *  FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
+ *  more details.
+ *
+ *  You should have received a copy of the GNU General Public License along
+ *  with LSD-Tools; if not, write to the Free Software Foundation, Inc.,
+ *  59 Temple Place, Suite 330, Boston, MA  02111-1307  USA.
+ *****************************************************************************/
+
+
+#ifndef LSD_LIST_H
+#define LSD_LIST_H
+
+
+/***********
+ *  Notes  *
+ ***********/
+/*
+ *  If NDEBUG is not defined, internal debug code will be enabled.  This is
+ *  intended for development use only and production code should define NDEBUG.
+ *
+ *  If WITH_LSD_FATAL_ERROR_FUNC is defined, the linker will expect to
+ *  find an external lsd_fatal_error(file,line,mesg) function.  By default,
+ *  lsd_fatal_error(file,line,mesg) is a macro definition that outputs an
+ *  error message to stderr.  This macro may be redefined to invoke another
+ *  routine instead.
+ *
+ *  If WITH_LSD_NOMEM_ERROR_FUNC is defined, the linker will expect to
+ *  find an external lsd_nomem_error(file,line,mesg) function.  By default,
+ *  lsd_nomem_error(file,line,mesg) is a macro definition that returns NULL.
+ *  This macro may be redefined to invoke another routine instead.
+ *
+ *  If WITH_PTHREADS is defined, these routines will be thread-safe.
+ */
+
+
+/****************
+ *  Data Types  *
+ ****************/
+
+typedef struct list * List;
+/*
+ *  List opaque data type.
+ */
+
+typedef struct listIterator * ListIterator;
+/*
+ *  List Iterator opaque data type.
+ */
+
+typedef void (*ListDelF) (void *x);
+/*
+ *  Function prototype to deallocate data stored in a list.
+ *    This function is responsible for freeing all memory associated
+ *    with an item, including all subordinate items (if applicable).
+ */
+
+typedef int (*ListCmpF) (void *x, void *y);
+/*
+ *  Function prototype for comparing two items in a list.
+ *  Returns less-than-zero if (x<y), zero if (x==y), and
+ *    greather-than-zero if (x>y).
+ */
+
+typedef int (*ListFindF) (void *x, void *key);
+/*
+ *  Function prototype for matching items in a list.
+ *  Returns non-zero if (x==key); o/w returns zero.
+ */
+
+typedef int (*ListForF) (void *x, void *arg);
+/*
+ *  Function prototype for operating on each item in a list.
+ *  Returns less-than-zero on error.
+ */
+
+
+/*******************************
+ *  General-Purpose Functions  *
+ *******************************/
+
+List list_create (ListDelF f);
+/*
+ *  Creates and returns a new empty list, or lsd_nomem_error() on failure.
+ *  The deletion function [f] is used to deallocate memory used by items
+ *    in the list; if this is NULL, memory associated with these items
+ *    will not be freed when the list is destroyed.
+ *  Note: Abandoning a list without calling list_destroy() will result
+ *    in a memory leak.
+ */
+
+void list_destroy (List l);
+/*
+ *  Destroys list [l], freeing memory used for list iterators and the
+ *    list itself; if a deletion function was specified when the list
+ *    was created, it will be called for each item in the list.
+ */
+
+int list_is_empty (List l);
+/*
+ *  Returns non-zero if list [l] is empty; o/w returns zero.
+ */
+
+int list_count (List l);
+/*
+ *  Returns the number of items in list [l].
+ */
+
+
+/***************************
+ *  List Access Functions  *
+ ***************************/
+
+void * list_append (List l, void *x);
+/*
+ *  Inserts data [x] at the end of list [l].
+ *  Returns the data's ptr, or lsd_nomem_error() if insertion failed.
+ */
+
+void * list_prepend (List l, void *x);
+/*
+ *  Inserts data [x] at the beginning of list [l].
+ *  Returns the data's ptr, or lsd_nomem_error() if insertion failed.
+ */
+
+void * list_find_first (List l, ListFindF f, void *key);
+/*
+ *  Traverses list [l] using [f] to match each item with [key].
+ *  Returns a ptr to the first item for which the function [f]
+ *    returns non-zero, or NULL if no such item is found.
+ *  Note: This function differs from list_find() in that it does not require
+ *    a list iterator; it should only be used when all list items are known
+ *    to be unique (according to the function [f]).
+ */
+
+int list_delete_all (List l, ListFindF f, void *key);
+/*
+ *  Traverses list [l] using [f] to match each item with [key].
+ *  Removes all items from the list for which the function [f] returns
+ *    non-zero; if a deletion function was specified when the list was
+ *    created, it will be called to deallocate each item being removed.
+ *  Returns a count of the number of items removed from the list.
+ */
+
+int list_for_each (List l, ListForF f, void *arg);
+/*
+ *  For each item in list [l], invokes the function [f] with [arg].
+ *  Returns a count of the number of items on which [f] was invoked.
+ *  If [f] returns <0 for a given item, the iteration is aborted and the
+ *    function returns the negative of that item's position in the list.
+ */
+
+void list_sort (List l, ListCmpF f);
+/*
+ *  Sorts list [l] into ascending order according to the function [f].
+ *  Note: Sorting a list resets all iterators associated with the list.
+ *  Note: The sort algorithm is stable.
+ */
+
+
+/****************************
+ *  Stack Access Functions  *
+ ****************************/
+
+void * list_push (List l, void *x);
+/*
+ *  Pushes data [x] onto the top of stack [l].
+ *  Returns the data's ptr, or lsd_nomem_error() if insertion failed.
+ */
+
+void * list_pop (List l);
+/*
+ *  Pops the data item at the top of the stack [l].
+ *  Returns the data's ptr, or NULL if the stack is empty.
+ */
+
+void * list_peek (List l);
+/*
+ *  Peeks at the data item at the top of the stack (or head of the queue) [l].
+ *  Returns the data's ptr, or NULL if the stack (or queue) is empty.
+ *  Note: The item is not removed from the list.
+ */
+
+
+/****************************
+ *  Queue Access Functions  *
+ ****************************/
+
+void * list_enqueue (List l, void *x);
+/*
+ *  Enqueues data [x] at the tail of queue [l].
+ *  Returns the data's ptr, or lsd_nomem_error() if insertion failed.
+ */
+
+void * list_dequeue (List l);
+/*
+ *  Dequeues the data item at the head of the queue [l].
+ *  Returns the data's ptr, or NULL if the queue is empty.
+ */
+
+
+/*****************************
+ *  List Iterator Functions  *
+ *****************************/
+
+ListIterator list_iterator_create (List l);
+/*
+ *  Creates and returns a list iterator for non-destructively traversing
+ *    list [l], or lsd_nomem_error() on failure.
+ */
+
+void list_iterator_reset (ListIterator i);
+/*
+ *  Resets the list iterator [i] to start traversal at the beginning
+ *    of the list.
+ */
+
+void list_iterator_destroy (ListIterator i);
+/*
+ *  Destroys the list iterator [i]; list iterators not explicitly destroyed
+ *    in this manner will be destroyed when the list is deallocated via
+ *    list_destroy().
+ */
+
+void * list_next (ListIterator i);
+/*
+ *  Returns a ptr to the next item's data,
+ *    or NULL once the end of the list is reached.
+ *  Example: i=list_iterator_create(i); while ((x=list_next(i))) {...}
+ */
+
+void * list_insert (ListIterator i, void *x);
+/*
+ *  Inserts data [x] immediately before the last item returned via list
+ *    iterator [i]; once the list iterator reaches the end of the list,
+ *    insertion is made at the list's end.
+ *  Returns the data's ptr, or lsd_nomem_error() if insertion failed.
+ */
+
+void * list_find (ListIterator i, ListFindF f, void *key);
+/*
+ *  Traverses the list from the point of the list iterator [i]
+ *    using [f] to match each item with [key].
+ *  Returns a ptr to the next item for which the function [f]
+ *    returns non-zero, or NULL once the end of the list is reached.
+ *  Example: i=list_iterator_reset(i); while ((x=list_find(i,f,k))) {...}
+ */
+
+void * list_remove (ListIterator i);
+/*
+ *  Removes from the list the last item returned via list iterator [i]
+ *    and returns the data's ptr.
+ *  Note: The client is responsible for freeing the returned data.
+ */
+
+int list_delete (ListIterator i);
+/*
+ *  Removes from the list the last item returned via list iterator [i];
+ *    if a deletion function was specified when the list was created,
+ *    it will be called to deallocate the item being removed.
+ *  Returns a count of the number of items removed from the list
+ *    (ie, '1' if the item was removed, and '0' otherwise).
+ */
+
+
+#endif /* !LSD_LIST_H */