oldXMenu/insque.c

   1 /* Copyright (C) 2002, 2003, 2004, 2005 Free Software Foundation, Inc.  */
   2
   3 /* This file implements the emacs_insque and emacs_remque functions,
   4    copies of the insque and remque functions of BSD.  They and all
   5    their callers have been renamed to emacs_mumble to allow us to
   6    include this file in the menu library on all systems.  */
   7
   8
   9 struct qelem {
  10   struct    qelem *q_forw;
  11   struct    qelem *q_back;
  12   char q_data[1];
  13 };
  14
  15 /* Insert ELEM into a doubly-linked list, after PREV.  */
  16
  17 void
  18 emacs_insque (elem, prev)
  19      struct qelem *elem, *prev;
  20 {
  21   struct qelem *next = prev->q_forw;
  22   prev->q_forw = elem;
  23   if (next)
  24     next->q_back = elem;
  25   elem->q_forw = next;
  26   elem->q_back = prev;
  27 }
  28
  29 /* Unlink ELEM from the doubly-linked list that it is in.  */
  30
  31 emacs_remque (elem)
  32      struct qelem *elem;
  33 {
  34   struct qelem *next = elem->q_forw;
  35   struct qelem *prev = elem->q_back;
  36   if (next)
  37     next->q_back = prev;
  38   if (prev)
  39     prev->q_forw = next;
  40 }
  41
  42 /* arch-tag: a8719d1a-5c3f-4bce-b36b-173106d36165
  43    (do not change this comment) */