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nvlist.c

/*
* nvlist.c - Minimal linked list library for name-value pairs
* Copyright (c) 2006-07 Red Hat Inc., Durham, North Carolina.
* All Rights Reserved. 
*
* This software may be freely redistributed and/or modified under the
* terms of the GNU General Public License as published by the Free
* Software Foundation; either version 2, 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; see the file COPYING. If not, write to the
* Free Software Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
*
* Authors:
*   Steve Grubb <sgrubb@redhat.com>
*/

#include "config.h"
#include <stdlib.h>
#include <string.h>
#include "nvlist.h"
#include "interpret.h"


void nvlist_create(nvlist *l)
{
      l->head = NULL;
      l->cur = NULL;
      l->cnt = 0;
}

static void nvlist_last(nvlist *l)
{
        register nvnode* window;
      
      if (l->head == NULL)
            return;

        window = l->head;
      while (window->next)
            window = window->next;
      l->cur = window;
}

nvnode *nvlist_next(nvlist *l)
{
      if (l->cur)
            l->cur = l->cur->next;
      return l->cur;
}

void nvlist_append(nvlist *l, nvnode *node)
{
      nvnode* newnode = malloc(sizeof(nvnode));

      newnode->name = node->name;
      newnode->val = node->val;
      newnode->interp_val = NULL;
      newnode->item = l->cnt; 
      newnode->next = NULL;

      // if we are at top, fix this up
      if (l->head == NULL)
            l->head = newnode;
      else {      // Otherwise add pointer to newnode
            if (l->cnt == (l->cur->item+1)) {
                  l->cur->next = newnode;
            }
            else {
                  nvlist_last(l);
                  l->cur->next = newnode;
            }
      }

      // make newnode current
      l->cur = newnode;
      l->cnt++;
}

/*
 * This function will start at current index and scan for a name
 */
int nvlist_find_name(nvlist *l, const char *name)
{
        register nvnode* window = l->cur;

      while (window) {
            if (strcmp(window->name, name) == 0) {
                  l->cur = window;
                  return 1;
            }
            else
                  window = window->next;
      }
      return 0;
}

const char *nvlist_interp_cur_val(const rnode *r)
{
      const nvlist *l = &r->nv;
      if (l->cur->interp_val)
            return l->cur->interp_val;
      return interpret(r);
}

void nvlist_clear(nvlist* l)
{
      nvnode* nextnode;
      register nvnode* current;

      current = l->head;
      while (current) {
            nextnode=current->next;
            free(current->name);
            free(current->val);
            free(current->interp_val);
            free(current);
            current=nextnode;
      }
      l->head = NULL;
      l->cur = NULL;
      l->cnt = 0;
}

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