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tfind.c

/*    $NetBSD: tfind.c,v 1.3.18.2 2005/03/23 11:12:21 tron Exp $  */

/*
 * Tree search generalized from Knuth (6.2.2) Algorithm T just like
 * the AT&T man page says.
 *
 * The node_t structure is for internal use only, lint doesn't grok it.
 *
 * Written by reading the System V Interface Definition, not the code.
 *
 * Totally public domain.
 */

#include <assert.h>
#define _SEARCH_PRIVATE
#include <stdlib.h>
#include <search.h>


/* find a node, or return 0 */
void *
tfind(const void *vkey,
      void * const *vrootp,
      int (*compar) (const void *, const void *))
{
      node_t * const *rootp = (node_t * const*)vrootp;

      if (rootp == NULL)
            return NULL;

      while (*rootp != NULL) {            /* T1: */
            int r;

            if ((r = (*compar)(vkey, (*rootp)->key)) == 0)  /* T2: */
                  return *rootp;          /* key found */
            rootp = (r < 0) ?
                &(*rootp)->llink :        /* T3: follow left branch */
                &(*rootp)->rlink;         /* T4: follow right branch */
      }
      return NULL;
}

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