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C/C++ Users Group Library 1996 July
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C-C++ Users Group Library July 1996.iso
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vol_300
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347_01
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tavlpred.c
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C/C++ Source or Header
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1991-04-25
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708b
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33 lines
/*:file:version:date: "%n V.%v; %f"
* "TAVLPRED.C V.8; 27-Apr-91,12:07:34"
*
* Purpose: Return a pointer to the in-order predeccessor of
* the node "p"
*
* Released to the PUBLIC DOMAIN
*
* author: Bert C. Hughes
* 200 N.Saratoga
* St.Paul, MN 55104
* Compuserve 71211,577
*/
#include "tavltree.h"
#include "tavlpriv.h"
TAVL_nodeptr tavl_pred(TAVL_nodeptr p)
{
register TAVL_nodeptr q;
if (!p)
return NULL;
q = p->Lptr;
if (LLINK(p))
while (RLINK(q))
q = q->Rptr;
return (Is_Head(q) ? NULL : q);
}