tc_find.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_find.c,v 1.5 2005/06/07 04:53:50 klmitch Exp $
*/
#include <errno.h>
#include <stdlib.h>
#include <string.h>

#include "treeconf_int.h"

RCSTAG("@(#)$Id: tc_find.c,v 1.5 2005/06/07 04:53:50 klmitch Exp $");

unsigned int
tc_find(treeconf_ctx_t *ctx, const char *name, treeconf_node_t **node_p,
      treeconf_node_t *parent)
{
  treeconf_node_t *node = 0;
  struct result res;
  unsigned int err = 0;
  int i;

  initialize_trcf_error_table();

  /* Verify the arguments */
  if (!tx_verify(ctx) || !name || !node_p ||
      (parent && (!tn_verify(parent) || parent->tn_context != ctx)))
    return EINVAL;

  /* OK, look up the node... */
  if ((err = _tc_lookup_node(ctx, name, parent, &res)))
    return err;

  /* Found the specific node? */
  if (!res.r_node || res.r_count != res.r_startnew) {
    /* No, can we create it? */
    if (_tn_call_nodown(res.r_node, &res.r_comps[res.r_startnew],
                  res.r_count - res.r_startnew)) {
      /* Create the nodes... */
      for (i = res.r_startnew, node = res.r_node; i < res.r_count; i++)
      /* All created nodes are implicit and default is 0 */
      if (!(node = _tc_create_node(ctx, node,
                             ((i == res.r_count - 1 ?
                               (TC_NODETYPE_VARIABLE) :
                               (TC_NODETYPE_NODE)) |
                              TC_NODETYPE_IMPLICIT),
                             res.r_comps[i].ts_string,
                             res.r_comps[i].ts_length, 0,
                             res.r_node->tn_nodown,
                             res.r_node->tn_change, 0)))
        _tc_doerror(ENOMEM);
    } else /* no such node and cannot create it... */
      _tc_doerror(ENOENT);
  } else
    node = res.r_node;

  *node_p = node; /* return the node! */

 error:
  free(res.r_comps); /* Release temporarily allocated memory */

  return err;
}

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