lib/libalpm/graph.h

   1 /*
   2  *  graph.h - helpful graph structure and setup/teardown methods
   3  *
   4  *  Copyright (c) 2006-2011 Pacman Development Team <pacman-dev@archlinux.org>
   5  *  Copyright (c) 2002-2006 by Judd Vinet <jvinet@zeroflux.org>
   6  *
   7  *  This program is free software; you can redistribute it and/or modify
   8  *  it under the terms of the GNU General Public License as published by
   9  *  the Free Software Foundation; either version 2 of the License, or
  10  *  (at your option) any later version.
  11  *
  12  *  This program is distributed in the hope that it will be useful,
  13  *  but WITHOUT ANY WARRANTY; without even the implied warranty of
  14  *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  15  *  GNU General Public License for more details.
  16  *
  17  *  You should have received a copy of the GNU General Public License
  18  *  along with this program.  If not, see <http://www.gnu.org/licenses/>.
  19  */
  20
  21 #include <sys/types.h> /* off_t */
  22
  23 #include "alpm_list.h"
  24 #include "util.h" /* MALLOC() */
  25 #include "alpm.h"
  26
  27 struct __pmgraph_t {
  28         char state; /* 0: untouched, -1: entered, other: leaving time */
  29         void *data;
  30         off_t weight; /* weight of the node */
  31         struct __pmgraph_t *parent; /* where did we come from? */
  32         alpm_list_t *children;
  33         alpm_list_t *childptr; /* points to a child in children list */
  34 };
  35 typedef struct __pmgraph_t pmgraph_t;
  36
  37 static pmgraph_t *_alpm_graph_new(void)
  38 {
  39         pmgraph_t *graph = NULL;
  40
  41         MALLOC(graph, sizeof(pmgraph_t), RET_ERR(PM_ERR_MEMORY, NULL));
  42
  43         if(graph) {
  44                 graph->state = 0;
  45                 graph->data = NULL;
  46                 graph->parent = NULL;
  47                 graph->children = NULL;
  48                 graph->childptr = NULL;
  49         }
  50         return(graph);
  51 }
  52
  53 static void _alpm_graph_free(void *data)
  54 {
  55         pmgraph_t *graph = data;
  56         alpm_list_free(graph->children);
  57         free(graph);
  58 }
  59