/***************************************************************************** * $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 . * * 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 (xy). */ 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 */