reactos/lib/crtdll/stdlib/bsearch.c

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