lib/dpkg/pkg-list.c

   1 /*
   2  * libdpkg - Debian packaging suite library routines
   3  * pkg-list.c - primitives for pkg linked list handling
   4  *
   5  * Copyright © 2009 Guillem Jover <guillem@debian.org>
   6  *
   7  * This 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 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 <https://www.gnu.org/licenses/>.
  19  */
  20
  21 #include <config.h>
  22 #include <compat.h>
  23
  24 #include <stdlib.h>
  25
  26 #include <dpkg/dpkg.h>
  27 #include <dpkg/dpkg-db.h>
  28 #include <dpkg/pkg-list.h>
  29
  30 /**
  31  * Create a new package list node.
  32  *
  33  * @param pkg The pkginfo to assign to the node.
  34  * @param next The next package list node.
  35  *
  36  * @return The new package list node.
  37  */
  38 struct pkg_list *
  39 pkg_list_new(struct pkginfo *pkg, struct pkg_list *next)
  40 {
  41         struct pkg_list *node;
  42
  43         node = m_malloc(sizeof(*node));
  44         node->pkg = pkg;
  45         node->next = next;
  46
  47         return node;
  48 }
  49
  50 /**
  51  * Free all nodes of a package list.
  52  *
  53  * @param head The head of the list to free.
  54  */
  55 void
  56 pkg_list_free(struct pkg_list *head)
  57 {
  58         while (head) {
  59                 struct pkg_list *node;
  60
  61                 node = head;
  62                 head = head->next;
  63
  64                 free(node);
  65         }
  66 }
  67
  68 /**
  69  * Prepend a package list node to a package list.
  70  *
  71  * @param head The head of the list to prepend to.
  72  * @param pkg The pkginfo to prepend to the list.
  73  */
  74 void
  75 pkg_list_prepend(struct pkg_list **head, struct pkginfo *pkg)
  76 {
  77         *head = pkg_list_new(pkg, *head);
  78 }