misc/search.h

   1 /* search.h -- declarations for `insque' and `remque'
   2 Copyright (C) 1995 Free Software Foundation, Inc.
   3 This file is part of the GNU C Library.
   4
   5 The GNU C Library is free software; you can redistribute it and/or
   6 modify it under the terms of the GNU Library General Public License as
   7 published by the Free Software Foundation; either version 2 of the
   8 License, or (at your option) any later version.
   9
  10 The GNU C Library is distributed in the hope that it will be useful,
  11 but WITHOUT ANY WARRANTY; without even the implied warranty of
  12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  13 Library General Public License for more details.
  14
  15 You should have received a copy of the GNU Library General Public
  16 License along with the GNU C Library; see the file COPYING.LIB.  If
  17 not, write to the Free Software Foundation, Inc., 675 Mass Ave,
  18 Cambridge, MA 02139, USA.  */
  19
  20 /* These functions are provided for compatibility with BSD.  */
  21
  22 #ifndef _SEARCH_H
  23 #define _SEARCH_H 1
  24
  25 #include <sys/cdefs.h>
  26
  27 __BEGIN_DECLS
  28
  29 /* Prototype structure for a linked-list data structure.
  30    This is the type used by the `insque' and `remque' functions.  */
  31
  32 struct qelem
  33   {
  34     struct qelem *q_forw;
  35     struct qelem *q_back;
  36     char q_data[1];
  37   };
  38
  39
  40 /* Insert ELEM into a doubly-linked list, after PREV.  */
  41 extern void insque __P ((struct qelem *__elem, struct qelem *__prev));
  42
  43 /* Unlink ELEM from the doubly-linked list that it is in.  */
  44 extern void remque __P ((struct qelem *elem));
  45
  46
  47 __END_DECLS
  48
  49 #endif  /* search.h */