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Annotation of GNUtools/emacs/oldXMenu/insque.c, revision 1.1.1.1

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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