xref: /netbsd/src/external/cddl/osnet/dist/tools/ctf/common/list.c

/*
 * CDDL HEADER START
 *
 * The contents of this file are subject to the terms of the
 * Common Development and Distribution License, Version 1.0 only
 * (the "License").  You may not use this file except in compliance
 * with the License.
 *
 * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
 * or http://www.opensolaris.org/os/licensing.
 * See the License for the specific language governing permissions
 * and limitations under the License.
 *
 * When distributing Covered Code, include this CDDL HEADER in each
 * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
 * If applicable, add the following below this CDDL HEADER, with the
 * fields enclosed by brackets "[]" replaced with your own identifying
 * information: Portions Copyright [yyyy] [name of copyright owner]
 *
 * CDDL HEADER END
 */
/*
 * Copyright 2005 Sun Microsystems, Inc.  All rights reserved.
 * Use is subject to license terms.
 */

#pragma ident       "%Z%%M%   %I%       %E% SMI"

/*
 * Routines for manipulating linked lists
 */

#if HAVE_NBTOOL_CONFIG_H
# include "nbtool_config.h"
#endif

#include <stdio.h>
#include <assert.h>
#include <stdlib.h>

#include "list.h"
#include "memory.h"

struct list {
          void *l_data;
          struct list *l_next;
};

/* Add an element to a list */
void
list_add(list_t **list, void *data)
{
          list_t *le;

          le = xmalloc(sizeof (list_t));
          le->l_data = data;
          le->l_next = *list;
          *list = le;
}

/* Add an element to a sorted list */
void
slist_add(list_t **list, void *data, int (*cmp)(void *, void *))
{
          list_t **nextp;

          for (nextp = list; *nextp; nextp = &((*nextp)->l_next)) {
                    if (cmp((*nextp)->l_data, data) > 0)
                              break;
          }

          list_add(nextp, data);
}

/*ARGSUSED2*/
static int
list_defcmp(void *d1, void *d2, void *private __unused)
{
          return (d1 != d2);
}

void *
list_remove(list_t **list, void *data, int (*cmp)(void *, void *, void *),
    void *private)
{
          list_t *le, **le2;
          void *led;

          if (!cmp)
                    cmp = list_defcmp;

          for (le = *list, le2 = list; le; le2 = &le->l_next, le = le->l_next) {
                    if (cmp(le->l_data, data, private) == 0) {
                              *le2 = le->l_next;
                              led = le->l_data;
                              free(le);
                              return (led);
                    }
          }

          return (NULL);
}

void
list_free(list_t *list, void (*datafree)(void *, void *), void *private)
{
          list_t *le;

          while (list) {
                    le = list;
                    list = list->l_next;
                    if (le->l_data && datafree)
                              datafree(le->l_data, private);
                    free(le);
          }
}

/*
 * This iterator is specifically designed to tolerate the deletion of the
 * node being iterated over.
 */
int
list_iter(list_t *list, int (*func)(void *, void *), void *private)
{
          list_t *lnext;
          int cumrc = 0;
          int cbrc;

          while (list) {
                    lnext = list->l_next;
                    if ((cbrc = func(list->l_data, private)) < 0)
                              return (cbrc);
                    cumrc += cbrc;
                    list = lnext;
          }

          return (cumrc);
}

/*ARGSUSED*/
static int
list_count_cb(void *data __unused, void *private __unused)
{
          return (1);
}

int
list_count(list_t *list)
{
          return (list_iter(list, list_count_cb, NULL));
}

int
list_empty(list_t *list)
{
          return (list == NULL);
}

void *
list_find(list_t *list, void *tmpl, int (*cmp)(void *, void *))
{
          for (; list; list = list->l_next) {
                    if (cmp(list->l_data, tmpl) == 0)
                              return (list->l_data);
          }

          return (NULL);
}

void *
list_first(list_t *list)
{
          return (list ? list->l_data : NULL);
}

void
list_concat(list_t **list1, list_t *list2)
{
          list_t *l, *last;

          for (l = *list1, last = NULL; l; last = l, l = l->l_next)
                    continue;

          if (last == NULL)
                    *list1 = list2;
          else
                    last->l_next = list2;
}

/*
 * Merges two sorted lists.  Equal nodes (as determined by cmp) are retained.
 */
void
slist_merge(list_t **list1p, list_t *list2, int (*cmp)(void *, void *))
{
          list_t *list1, *next2;
          list_t *last1 = NULL;

          if (*list1p == NULL) {
                    *list1p = list2;
                    return;
          }

          list1 = *list1p;
          while (list2 != NULL) {
                    if (cmp(list1->l_data, list2->l_data) > 0) {
                              next2 = list2->l_next;

                              if (last1 == NULL) {
                                        /* Insert at beginning */
                                        *list1p = last1 = list2;
                                        list2->l_next = list1;
                              } else {
                                        list2->l_next = list1;
                                        last1->l_next = list2;
                                        last1 = list2;
                              }

                              list2 = next2;
                    } else {

                              last1 = list1;
                              list1 = list1->l_next;

                              if (list1 == NULL) {
                                        /* Add the rest to the end of list1 */
                                        last1->l_next = list2;
                                        list2 = NULL;
                              }
                    }
          }
}