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Annotation of GNUtools/emacs/oldXMenu/insque.c, revision 1.1

1.1     ! root        1: /* This file implements the insque and remque functions of BSD.
        !             2:    It is not compiled by default, because that change would be too risky
        !             3:    to install right now.  If you find that HAVE_X_MENU leads to linker errors
        !             4:    because these functions are undefined, then compile this file
        !             5:    and arrange to link it in.  */
        !             6: 
        !             7: struct qelem {
        !             8:   struct    qelem *q_forw;
        !             9:   struct    qelem *q_back;
        !            10:   char q_data[1];
        !            11: };
        !            12: 
        !            13: /* Insert ELEM into a doubly-linked list, after PREV.  */
        !            14: 
        !            15: void
        !            16: insque (elem, prev) 
        !            17:      struct qelem *elem, *prev;
        !            18: {
        !            19:   struct qelem *next = prev->q_forw;
        !            20:   prev->q_forw = elem;
        !            21:   if (next)
        !            22:     next->q_back = elem;
        !            23:   elem->q_forw = next;
        !            24:   elem->q_back = prev;
        !            25: }
        !            26: 
        !            27: /* Unlink ELEM from the doubly-linked list that it is in.  */
        !            28: 
        !            29: remque (elem)
        !            30:      struct qelem *elem;
        !            31: {
        !            32:   struct qelem *next = elem->q_forw;
        !            33:   struct qelem *prev = elem->q_back;
        !            34:   if (next)
        !            35:     next->q_back = prev;
        !            36:   if (prev)
        !            37:     prev->q_forw = next;
        !            38: }

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