_tc_node.c

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/*
** Copyright (C) 2004, 2005 by Kevin L. Mitchell <klmitch@mit.edu>
**
** This program 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.
**
** This program 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 this program; if not, write to the Free Software
** Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
**
** @(#)$Id: _tc_node.c,v 1.6 2005/06/07 04:53:50 klmitch Exp $
*/
#include <stdlib.h>
#include <string.h>

#include "treeconf_int.h"

RCSTAG("@(#)$Id: _tc_node.c,v 1.6 2005/06/07 04:53:50 klmitch Exp $");

void
_tc_release_children(treeconf_node_t *node)
{
  treeconf_node_t *tnode;

  while ((tnode = node->tn_down)) { /* Walk through all the children... */
    node->tn_down = tnode->tn_next; /* shift next node up */

    _tc_release_node(tnode); /* release the node */
  }
}

treeconf_node_t *
_tc_create_node(treeconf_ctx_t *ctx, treeconf_node_t *parent,
            treeconf_type_t type, const char *name, int len,
            const char *def, treeconf_nodown_t nodown,
            treeconf_change_t change, void *assoc)
{
  treeconf_node_t *node;

  /* Create the node... */
  if (!(node = (treeconf_node_t *)malloc(sizeof(treeconf_node_t) + len)))
    return 0;

  /* Then duplicate the default, if given */
  if (def && !(def = strdup(def))) {
    free(node);
    return 0;
  }

  /* Initialize the node */
  node->tn_context = ctx;
  node->tn_type = type;
  node->tn_next = parent ? parent->tn_down : ctx->tx_config;
  node->tn_down = 0;
  node->tn_parent = parent;
  node->tn_nodown = nodown;
  node->tn_change = change;
  node->tn_value = node->tn_default = def;
  node->tn_assoc = assoc;
  strncpy(node->tn_name, name, len);
  node->tn_name[len] = '\0';

  /* Make it valid */
  node->tn_magic = TREECONF_NODE_MAGIC;

  /* And link it into the parent or context as appropriate */
  if (parent)
    parent->tn_down = node;
  else
    ctx->tx_config = node;

  /* Finally, increment the count of configs */
  ctx->tx_count++;

  return node; /* return the new node */
}

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