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56 lines
1.5 KiB
C
56 lines
1.5 KiB
C
/* Copyright (C) 1992 Free Software Foundation, Inc.
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This file is part of the GNU C Library.
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The GNU C Library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Library General Public License as
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published by the Free Software Foundation; either version 2 of the
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License, or (at your option) any later version.
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The GNU C Library is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Library General Public License for more details.
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You should have received a copy of the GNU Library General Public
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License along with the GNU C Library; see the file COPYING.LIB. If
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not, write to the Free Software Foundation, Inc., 675 Mass Ave,
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Cambridge, MA 02139, USA. */
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#include <ansidecl.h>
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#include <stddef.h>
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struct qelem
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{
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struct qelem *q_forw;
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struct qelem *q_back;
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char q_data[1];
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};
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/* Insert ELEM into a doubly-linked list, after PREV. */
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void
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DEFUN(insque, (elem, prev) ,
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struct qelem *elem AND struct qelem *prev)
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{
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struct qelem *next = prev->q_forw;
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prev->q_forw = elem;
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if (next != NULL)
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next->q_back = elem;
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elem->q_forw = next;
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elem->q_back = prev;
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}
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/* Unlink ELEM from the doubly-linked list that it is in. */
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void
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DEFUN(remque, (elem),
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struct qelem *elem)
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{
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struct qelem *next = elem->q_forw;
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struct qelem *prev = elem->q_back;
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if (next != NULL)
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next->q_back = prev;
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if (prev != NULL)
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prev->q_forw = next;
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}
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