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Sourcecode: ipsec-tools version File versions

genlist.c

/* $Id: genlist.c,v 1.2 2004/07/12 20:43:50 ludvigm Exp $ */

/*
 * Copyright (C) 2004 SuSE Linux AG, Nuernberg, Germany.
 * Contributed by: Michal Ludvig <mludvig@suse.cz>, SUSE Labs
 * 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.
 * 3. Neither the name of the project nor the names of its contributors
 *    may be used to endorse or promote products derived from this software
 *    without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE PROJECT 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 PROJECT 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.
 */

#include <stdio.h>
#include <stdlib.h>
#include <sys/queue.h>

#include "genlist.h"

struct genlist *
genlist_init (void)
{
      struct genlist *new = calloc(sizeof(struct genlist), 1);
      TAILQ_INIT(new);
      return new;
}

struct genlist_entry *
genlist_insert (struct genlist *head, void *data)
{
      struct genlist_entry *entry = calloc(sizeof(struct genlist_entry), 1);
      entry->data = data;
      TAILQ_INSERT_HEAD(head, entry, chain);
      return entry;
}

struct genlist_entry *
genlist_append (struct genlist *head, void *data)
{
      struct genlist_entry *entry = calloc(sizeof(struct genlist_entry), 1);
      entry->data = data;
      TAILQ_INSERT_TAIL(head, entry, chain);
      return entry;
}

void *
genlist_foreach (struct genlist *head, genlist_func_t func, void *arg)
{
      struct genlist_entry *p;
      void *ret = NULL;
      TAILQ_FOREACH(p, head, chain) {
            ret = (*func)(p->data, arg);
            if (ret)
                  break;
      }

      return ret;
}

void *
genlist_next (struct genlist *head, struct genlist_entry **buf)
{
      struct genlist_entry *p;

      if (head)
            p = TAILQ_FIRST(head);
      else
            p = (buf && *buf) ? TAILQ_NEXT(*buf, chain) : NULL;
      if (buf)
            *buf = p;
      return (p ? p->data : NULL);
}

void
genlist_free (struct genlist *head, genlist_freedata_t func)
{
      struct genlist_entry *p;

      while ((p = TAILQ_LAST(head, genlist)) != NULL) {
            TAILQ_REMOVE(head, p, chain);
            if (func)
                  func(p->data);
            free(p);
      }
      free(head);
}


#if 0
/* Here comes the example... */
struct conf {
      struct genlist    *l1, *l2;
};

void *
print_entry(void *entry, void *arg)
{
      if (!entry)
            return NULL;
      printf("%s\n", (char *)entry);
      return NULL;
}

void
dump_list(struct genlist *head)
{
      genlist_foreach(head, print_entry, NULL);
}

void
free_data(void *data)
{
      printf ("removing %s\n", (char *)data);
}

int main()
{
      struct conf *cf;
      char *cp;
      struct genlist_entry *gpb;

      cf = calloc(sizeof(struct conf), 1);
      cf->l1 = genlist_init();
      cf->l2 = genlist_init();
      
      genlist_insert(cf->l1, "Ahoj");
      genlist_insert(cf->l1, "Cau");
      genlist_insert(cf->l1, "Nazdar");
      genlist_insert(cf->l1, "Te buch");

      genlist_append(cf->l2, "Curak");
      genlist_append(cf->l2, "Kozy");
      genlist_append(cf->l2, "Pica");
      genlist_append(cf->l2, "Prdel");

      printf("List 2\n");
      dump_list(cf->l2);
      printf("\nList 1\n");
      dump_list(cf->l1);

      printf("\nList 2 - using genlist_next()\n");
      for (cp = genlist_next (cf->l2, &gpb); cp; cp = genlist_next (0, &gpb))
          printf("%s\n", cp);

      printf("\nFreeing List 1\n");
      /* the data here isn't actually alloc'd so we would really call
       * genlist_free (cf->l1, 0);    but to illustrate the idea */
      genlist_free (cf->l1, free_data);
      cf->l1 = 0;

      return 0;
}
#endif

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