reactos/lib/sdk/crt/search/bsearch.c

   1 /* Copyright (C) 1994 DJ Delorie, see COPYING.DJ for details */
   2 #include <stdlib.h>
   3
   4 /*
   5  * @implemented
   6  */
   7 void *
   8 bsearch(const void *key, const void *base0, size_t nelem,
   9         size_t size, int (*cmp)(const void *ck, const void *ce))
  10 {
  11   char *base = (char *)base0;
  12   int lim, cmpval;
  13   void *p;
  14
  15   for (lim = nelem; lim != 0; lim >>= 1)
  16   {
  17     p = base + (lim >> 1) * size;
  18     cmpval = (*cmp)(key, p);
  19     if (cmpval == 0)
  20       return p;
  21     if (cmpval > 0)
  22     {                           /* key > p: move right */
  23       base = (char *)p + size;
  24       lim--;
  25     } /* else move left */
  26   }
  27   return 0;
  28 }